/* ============================================================
   LETTERBOOKS — Design System v2
   Editorial · Elegant · Sophisticated
   Palette: cream / navy / golden
   Typography: Playfair Display + DM Sans
   ============================================================ */

/* ── Variables ───────────────────────────────────────────── */
:root {
  /* Brand palette */
  --color-bg:      #FAF8F3;
  --color-text:    #1B2A4A;
  --color-accent:  #D4A017;
  --color-surface: #F0EDE4;
  --color-muted:   #6B7A99;

  /* Derived */
  --color-accent-hover:  #B8880F;
  --color-text-inverse:  #FAF8F3;
  --color-border:        rgba(27, 42, 74, 0.12);
  --color-border-subtle: rgba(27, 42, 74, 0.06);
  --color-danger:        #C0392B;
  --color-danger-bg:     #fdf0ef;
  --color-success:       #2E7D32;

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:  'DM Sans', system-ui, -apple-system, sans-serif;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;

  /* Radii */
  --radius-sm:   4px;
  --radius:      6px;
  --radius-lg:   10px;
  --radius-full: 9999px;

  /* Shadows — never heavy */
  --shadow-xs: 0 1px 2px  rgba(27, 42, 74, 0.05);
  --shadow-sm: 0 2px 8px  rgba(27, 42, 74, 0.08);
  --shadow:    0 4px 16px rgba(27, 42, 74, 0.10);
  --shadow-lg: 0 8px 32px rgba(27, 42, 74, 0.12);

  --transition: all 0.2s ease;

  /* Legacy aliases — kept so JS-generated HTML keeps working */
  --primary-color:    var(--color-text);
  --primary-hover:    #0d1f38;
  --text-color:       var(--color-text);
  --background-color: var(--color-bg);
  --card-background:  #FFFFFF;
  --accent-color-1:   var(--color-accent);
  --accent-color-2:   var(--color-muted);
  --light-text:       var(--color-muted);
  --border-radius:    var(--radius);

  font-family: var(--font-sans);
  line-height: 1.6;
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* ── Layout ──────────────────────────────────────────────── */
#root {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--sp-8);
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ── Typography base ─────────────────────────────────────── */
h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--color-text);
  line-height: 1.2;
  margin: 0 0 var(--sp-4);
}

h1 { font-size: 2.4rem; font-weight: 700; }
h2 { font-size: 1.75rem; font-weight: 600; }
h3 { font-size: 1.2rem; font-weight: 600; }

p {
  color: var(--color-text);
  margin: 0 0 var(--sp-4);
  font-family: var(--font-sans);
}

a { color: var(--color-text); }

/* Animated underline for text links */
.link-animated {
  position: relative;
  text-decoration: none;
}

.link-animated::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  right: 50%;
  height: 1px;
  background: currentColor;
  transition: left 0.2s ease, right 0.2s ease;
}

.link-animated:hover::after {
  left: 0;
  right: 0;
}

/* ── Fade-in animation ───────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.5s ease forwards;
}

/* Intersection observer targets */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Header / Navbar ─────────────────────────────────────── */
header,
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4) var(--sp-6);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  /* No heavy shadow */
}

/* Override any legacy extra styles */
.main-header {
  border-radius: 0;
  box-shadow: none;
}

.logo-container {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo {
  height: 2.8em;
  transition: transform 0.2s ease, filter 0.2s ease;
  will-change: transform;
}

.logo:hover {
  transform: scale(1.04);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* Login button — outline style */
.login-button {
  padding: 0.52em 1.2em;
  background-color: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-text);
  border-radius: var(--radius);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: var(--transition);
}

.login-button:hover {
  background-color: var(--color-text);
  color: var(--color-text-inverse);
}

/* User menu */
.user-menu {
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.user-name {
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.48em 0.9em;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  background-color: transparent;
}

.user-name:hover,
.user-menu:hover .user-name {
  background-color: var(--color-surface);
  border-color: rgba(27, 42, 74, 0.25);
}

.user-dropdown {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background-color: #FFFFFF;
  min-width: 176px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  z-index: 200;
  padding: var(--sp-1) 0;
  overflow: hidden;
}

.user-dropdown a {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.68rem var(--sp-4);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: background-color 0.15s ease;
}

.user-dropdown a:hover {
  background-color: var(--color-surface);
}

.user-menu:hover .user-dropdown {
  display: block;
}

/* ── Navbar Search ───────────────────────────────────────── */
.nav-search {
  position: relative;
  flex: 1;
  max-width: 400px;
  margin: 0 var(--sp-5);
}

.nav-search-wrap {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0 var(--sp-3);
  transition: var(--transition);
}

.nav-search-wrap:focus-within {
  background: #FFFFFF;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.12);
}

.nav-search-icon {
  color: var(--color-muted);
  font-size: 0.78rem;
  flex-shrink: 0;
}

.nav-search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 0.52em var(--sp-2);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text);
  width: 100%;
}

.nav-search-input::placeholder {
  color: var(--color-muted);
}

.nav-search-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 300;
  overflow: hidden;
}

.nav-search-dropdown[hidden] {
  display: none;
}

.nsd-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  text-decoration: none;
  color: var(--color-text);
  transition: background-color 0.15s ease;
}

.nsd-item:hover {
  background-color: var(--color-surface);
}

.nsd-item + .nsd-item {
  border-top: 1px solid var(--color-border-subtle);
}

.nsd-cover {
  width: 34px;
  height: 50px;
  object-fit: cover;
  border-radius: 3px;
  flex-shrink: 0;
  background: var(--color-surface);
}

.nsd-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.nsd-title {
  font-family: var(--font-serif);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nsd-sub {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  background-color: var(--color-text);
  margin-top: var(--sp-20);
  padding: var(--sp-10) 0;
  border-top: none;
  color: var(--color-text-inverse);
}

footer .footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
  text-align: center;
}

footer .footer-content p {
  color: rgba(250, 248, 243, 0.65);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  margin: 0;
  letter-spacing: 0.02em;
}

/* ── Hero Section ────────────────────────────────────────── */
.hero-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface);
  padding: var(--sp-16) var(--sp-12);
  margin: 0 0 var(--sp-16);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

/* Decorative stripe on the left edge */
.hero-section::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--color-accent);
}

.hero-content {
  flex: 1;
  max-width: 580px;
  z-index: 2;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.12;
  color: var(--color-text);
  margin: 0 0 var(--sp-4);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--color-muted);
  margin: 0 0 var(--sp-8);
  font-weight: 400;
  line-height: 1.65;
}

.hero-decoration {
  position: relative;
  width: 260px;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.book-stack {
  position: relative;
  width: 150px;
  height: 200px;
  transform: perspective(800px) rotateY(20deg);
}

.book-spine {
  position: absolute;
  bottom: 0;
  width: 42px;
  border-radius: 3px 3px 0 0;
  box-shadow: -3px 3px 10px rgba(27, 42, 74, 0.2);
}

.book-spine-1 {
  height: 200px;
  left: 0;
  background-color: var(--color-text);
  z-index: 3;
}

.book-spine-2 {
  height: 175px;
  left: 40px;
  background-color: var(--color-accent);
  z-index: 2;
}

.book-spine-3 {
  height: 155px;
  left: 80px;
  background-color: var(--color-muted);
  z-index: 1;
}

/* ── Search Bar ──────────────────────────────────────────── */
.search-bar {
  display: flex;
  gap: var(--sp-2);
  width: 100%;
  max-width: 540px;
  margin: var(--sp-4) 0;
}

.search-input-container {
  position: relative;
  flex-grow: 1;
}

.search-icon {
  position: absolute;
  left: var(--sp-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  pointer-events: none;
  font-size: 0.875rem;
}

#search-input {
  width: 100%;
  padding: 0.85rem var(--sp-4) 0.85rem 2.7rem;
  background-color: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  transition: var(--transition);
}

#search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.14);
}

#search-input::placeholder {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.search-button {
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  border: 1.5px solid var(--color-text);
  border-radius: var(--radius);
  padding: 0 var(--sp-5);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  white-space: nowrap;
}

.search-button:hover {
  background-color: transparent;
  color: var(--color-text);
}

/* ── Sections ────────────────────────────────────────────── */
.books-section {
  margin-bottom: var(--sp-16);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-6);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.section-title::before {
  content: '';
  display: none; /* replaced by the border-bottom on section-header */
}

.section-title i {
  color: var(--color-accent);
  font-size: 1.1rem;
}

.view-all {
  color: var(--color-muted);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  transition: var(--transition);
}

.view-all:hover {
  color: var(--color-text);
  transform: translateX(3px);
}

/* ── Books Grid ──────────────────────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: var(--sp-5);
}

/* ── Books Carousel ──────────────────────────────────────── */
.books-carousel {
  display: flex;
  flex-direction: row;
  gap: var(--sp-4);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: var(--sp-2);
  cursor: grab;
  user-select: none;
}

.books-carousel::-webkit-scrollbar {
  display: none;
}

.books-carousel.is-dragging {
  cursor: grabbing;
  scroll-behavior: auto;
}

.books-carousel > a {
  flex: 0 0 160px;
  width: 160px;
  text-decoration: none;
  color: inherit;
  display: block;
}

/* ── Book Card ───────────────────────────────────────────── */
.book-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.book-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  height: 100%;
  max-height: 480px;
}

.book-card:hover,
.book-card-link:hover .book-card {
  transform: translateY(-4px);
  box-shadow: var(--shadow-sm);
  border-color: var(--color-border);
}

.book-cover-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: hidden;
}

.book-cover {
  width: 100%;
  height: 270px;
  object-fit: cover;
  background-color: var(--color-surface);
  display: block;
  transition: transform 0.4s ease;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-card:hover .book-cover,
.book-card-link:hover .book-cover {
  transform: scale(1.04);
}

.book-info {
  display: flex;
  flex-direction: column;
  padding: var(--sp-3) var(--sp-4) var(--sp-4);
  flex-grow: 1;
}

.book-title {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--sp-1);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0;
}

.book-author {
  font-family: var(--font-sans);
  font-size: 0.83rem;
  color: var(--color-muted);
  margin: 0;
  font-weight: 400;
  padding: 0;
}

.book-year {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--color-muted);
  padding: 0;
  margin-top: var(--sp-1);
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-2);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-muted);
  background-color: var(--color-surface);
  padding: 0.22rem 0.6rem;
  border-radius: var(--radius-full);
}

/* ── Loading indicator ───────────────────────────────────── */
.loading-indicator {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-12) 0;
  color: var(--color-muted);
  font-family: var(--font-sans);
}

.loading-indicator i {
  font-size: 1.6rem;
  color: var(--color-accent);
}

/* ── Features Section ────────────────────────────────────── */
.features-section {
  background-color: var(--color-surface);
  padding: var(--sp-20) var(--sp-12);
  margin: 0 calc(-1 * var(--sp-6));
  text-align: center;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features-title {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--sp-12);
  letter-spacing: -0.01em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-6);
  max-width: 900px;
  margin: 0 auto;
}

.feature-card {
  background-color: var(--color-bg);
  padding: var(--sp-10) var(--sp-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  height: 100%;
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-3px);
}

.feature-icon {
  font-size: 1.8rem;
  color: var(--color-accent);
  margin-bottom: var(--sp-5);
}

.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-text);
  margin: 0 0 var(--sp-3);
  font-weight: 600;
}

.feature-card p {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.93rem;
  line-height: 1.65;
  margin: 0;
}

/* ── Profile Header ──────────────────────────────────────── */
.profile-header {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  padding: var(--sp-10) 0 var(--sp-8);
  margin-bottom: var(--sp-8);
  border-bottom: 1px solid var(--color-border);
}

.avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.user-info {
  flex-grow: 1;
}

.user-info h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--sp-1);
}

.user-info p {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.93rem;
  margin: 0 0 var(--sp-3);
}

.social-stats {
  display: flex;
  gap: var(--sp-5);
  align-items: center;
  flex-wrap: wrap;
  margin-top: var(--sp-2);
}

.stat-link {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
}

.stat-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width 0.2s ease;
}

.stat-link:hover {
  color: var(--color-text);
}

.stat-link:hover::after {
  width: 100%;
}

.stat-link strong {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-right: 0.2rem;
}

/* ── Stats Cards ─────────────────────────────────────────── */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--sp-5);
  margin-bottom: var(--sp-12);
}

.clickable-stat {
  text-decoration: none;
  color: inherit;
}

.stat-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: var(--transition);
  display: block;
}

.stat-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-3px);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-text);
  margin: var(--sp-3) 0 var(--sp-1);
  display: block;
}

.stat-label {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.875rem;
  margin: 0;
  font-weight: 400;
}

/* ── Buttons ─────────────────────────────────────────────── */
.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.action-button {
  padding: 0.68em 1.3em;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.93rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  border: 1.5px solid transparent;
  letter-spacing: 0.01em;
}

.action-button i {
  font-size: 1rem;
}

/* Primary: solid navy */
.checkin-button {
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  border-color: var(--color-text);
}

.checkin-button:hover {
  background-color: transparent;
  color: var(--color-text);
}

/* Success: golden accent */
.read-button {
  background-color: var(--color-accent);
  color: var(--color-text);
  border-color: var(--color-accent);
}

.read-button:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

/* Outline: subtle */
.wishlist-button {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.wishlist-button:hover {
  border-color: var(--color-accent);
  background-color: rgba(212, 160, 23, 0.06);
}

.button-disabled {
  background-color: var(--color-surface) !important;
  border-color: var(--color-border) !important;
  color: var(--color-muted) !important;
  cursor: not-allowed;
  opacity: 0.65;
}

/* Utility back button */
.button {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.52em 1.1em;
  background-color: transparent;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.button:hover,
.secondary-button:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

.secondary-button {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.52em 1.1em;
  background-color: transparent;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}

/* ── Follow Button ───────────────────────────────────────── */
.follow-button {
  background-color: var(--color-accent);
  color: var(--color-text);
  padding: 0.5em 1.1em;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

.follow-button:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.follow-button.following {
  background-color: transparent;
  color: var(--color-muted);
  border-color: var(--color-border);
}

.follow-button.following:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
  background-color: rgba(192, 57, 43, 0.05);
}

/* ── Modal ───────────────────────────────────────────────── */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(27, 42, 74, 0.45);
  backdrop-filter: blur(2px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: var(--color-bg);
  padding: var(--sp-10);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-6);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  font-family: var(--font-serif);
  margin: 0;
  color: var(--color-text);
  font-size: 1.35rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.close-modal {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  line-height: 1;
  padding: 0;
}

.close-modal:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
}

/* ── Forms ───────────────────────────────────────────────── */
.form-group {
  margin-bottom: var(--sp-5);
}

.form-group label {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.78em var(--sp-4);
  border-radius: var(--radius);
  border: 1.5px solid var(--color-border);
  background-color: #FFFFFF;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-muted);
  opacity: 0.7;
}

.form-group textarea {
  min-height: 108px;
  resize: vertical;
}

.submit-checkin {
  padding: 0.82em var(--sp-6);
  background-color: var(--color-accent);
  color: var(--color-text);
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
}

.submit-checkin:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* Auth form */
.card {
  padding: var(--sp-10);
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  max-width: 400px;
  margin: 0 auto;
}

.card h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  color: var(--color-text);
  margin: 0 0 var(--sp-6);
  text-align: center;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.auth-form input {
  padding: 0.78em var(--sp-4);
  border-radius: var(--radius);
  border: 1.5px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition);
  width: 100%;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.12);
}

.auth-form input::placeholder {
  color: var(--color-muted);
}

.auth-form button {
  padding: 0.82em var(--sp-4);
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  border: 1.5px solid var(--color-text);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.auth-form button:hover {
  background-color: transparent;
  color: var(--color-text);
}

.toggle-auth {
  margin-top: var(--sp-5);
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  text-align: center;
  transition: color 0.2s ease;
}

.toggle-auth:hover {
  color: var(--color-text);
  text-decoration: underline;
}

/* ── Checkin/Review history ──────────────────────────────── */
.checkin-history,
.public-checkins {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  margin-top: var(--sp-8);
  border: 1px solid var(--color-border);
}

.checkin-history h3,
.public-checkins h3 {
  font-family: var(--font-serif);
  color: var(--color-text);
  margin: 0 0 var(--sp-5);
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.checkin-history h3 i,
.public-checkins h3 i {
  color: var(--color-accent);
}

.checkins-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.checkin-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--sp-4) var(--sp-5);
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.checkin-item:hover {
  box-shadow: var(--shadow-sm);
}

.checkin-content {
  flex-grow: 1;
}

.checkin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-2);
}

.checkin-user {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.93rem;
}

.checkin-date {
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 400;
}

.checkin-review {
  font-family: var(--font-sans);
  color: var(--color-text);
  font-size: 0.93rem;
  line-height: 1.65;
}

.no-checkins {
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-style: italic;
  text-align: center;
  padding: var(--sp-5);
  font-size: 0.93rem;
}

.delete-checkin {
  background: none;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
  padding: var(--sp-1) var(--sp-2);
  font-size: 0.83rem;
  transition: var(--transition);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex-shrink: 0;
  margin-left: var(--sp-3);
}

.delete-checkin:hover {
  color: var(--color-danger);
  background-color: rgba(192, 57, 43, 0.06);
}

/* ── Book Detail Page ────────────────────────────────────── */
.book-detail-container {
  padding: var(--sp-8) 0;
}

.book-detail {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--sp-12);
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--sp-10);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

/* Book detail cover — preserve aspect ratio */
.book-detail .book-cover-container img,
.book-detail .book-cover,
img.book-cover {
  width: 100%;
  max-width: 280px;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.book-detail .book-cover:hover {
  transform: scale(1.02);
}

/* Detail page title sizes (overriding grid card sizes) */
.book-detail .book-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  line-height: 1.15;
  -webkit-line-clamp: unset;
  line-clamp: unset;
  display: block;
  overflow: visible;
}

.book-detail .book-author {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  color: var(--color-muted);
  margin: var(--sp-1) 0 var(--sp-4);
  font-weight: 400;
}

.book-subtitle {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  font-style: italic;
  color: var(--color-muted);
}

.book-header {
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.book-description {
  font-family: var(--font-sans);
  line-height: 1.8;
  color: var(--color-text);
  font-size: 0.98rem;
  margin-top: var(--sp-5);
}

.show-more-link,
.show-less-link {
  color: var(--color-accent);
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
}

.show-more-link:hover,
.show-less-link:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ── Log Items (Reading Diary) ───────────────────────────── */
.log-container {
  margin: var(--sp-6) 0;
}

.log-item {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  margin-bottom: var(--sp-4);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
}

.log-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(27, 42, 74, 0.18);
}

.log-header {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--sp-4);
}

.log-book-info {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  flex-grow: 1;
}

.log-book-cover {
  width: 54px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
  transition: var(--transition);
}

.log-item:hover .log-book-cover {
  transform: scale(1.04);
}

.log-book-details {
  flex-grow: 1;
}

.log-book-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-text);
  margin: 0 0 var(--sp-1);
  line-height: 1.35;
}

.log-book-author {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.87rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.log-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--sp-2);
}

.log-date {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Quote-style review block */
.log-review {
  margin-top: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-surface);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-accent);
  position: relative;
}

.log-review::before {
  content: '\f10d';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  top: var(--sp-3);
  left: var(--sp-3);
  color: rgba(212, 160, 23, 0.15);
  font-size: 1.4rem;
}

.log-review-content {
  padding-left: var(--sp-4);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: var(--font-sans);
}

.no-review {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-style: italic;
  text-align: center;
  padding: var(--sp-4) 0;
  font-size: 0.88rem;
}

.log-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.log-action-button {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-full);
  transition: var(--transition);
  font-family: var(--font-sans);
  font-size: 0.87rem;
  font-weight: 500;
}

.delete-log {
  color: var(--color-muted);
}

.delete-log:hover {
  color: var(--color-danger);
  background-color: rgba(192, 57, 43, 0.06);
}

/* ── Log Filters ─────────────────────────────────────────── */
.log-filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-8);
  padding: var(--sp-4) var(--sp-5);
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
}

.filter-options,
.sort-options {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.filter-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.filter-select {
  padding: 0.42rem 0.9rem;
  border-radius: var(--radius);
  border: 1.5px solid var(--color-border);
  background-color: var(--color-bg);
  font-family: var(--font-sans);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.filter-select:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* ── Follower / Following cards ──────────────────────────── */
.followers-container {
  margin-top: var(--sp-5);
}

.follower-card {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.15s ease;
  cursor: pointer;
  position: relative;
}

.follower-card:last-child {
  border-bottom: none;
}

.follower-card:hover {
  background-color: var(--color-surface);
}

.follower-card-link {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.follower-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.follower-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.follower-info {
  flex-grow: 1;
}

.follower-name {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  margin-bottom: var(--sp-1);
}

.follower-email {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.83rem;
}

.follow-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--sp-5);
}

.tab {
  padding: 0.65rem var(--sp-6);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.88rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  color: var(--color-muted);
  transition: var(--transition);
  margin-bottom: -1px;
}

.tab.active {
  border-bottom-color: var(--color-accent);
  color: var(--color-text);
}

.tab:hover:not(.active) {
  color: var(--color-text);
}

/* ── Page Header ─────────────────────────────────────────── */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-family: var(--font-serif);
  margin: 0;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.page-title i {
  color: var(--color-accent);
  font-size: 1.4rem;
}

/* ── Star Ratings ────────────────────────────────────────── */
.star-rating-container {
  margin: var(--sp-2) 0;
}

.star-rating {
  display: flex;
  align-items: center;
}

.star-rating-value {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-accent);
  margin-right: var(--sp-3);
  min-width: 26px;
}

.stars {
  display: flex;
  cursor: pointer;
}

.stars i {
  color: var(--color-border);
  padding: 0 2px;
  font-size: 1.25rem;
  transition: all 0.15s ease;
}

.stars i.active {
  color: var(--color-accent);
}

.stars i:hover {
  transform: scale(1.15);
}

/* ── Remove button ───────────────────────────────────────── */
.remove-btn {
  background-color: transparent;
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
  border-radius: var(--radius);
  padding: 0.38rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.83rem;
  cursor: pointer;
  transition: var(--transition);
  margin-top: var(--sp-2);
  width: 100%;
}

.remove-btn:hover {
  background-color: var(--color-danger);
  color: #fff;
}

/* ── Pagination ──────────────────────────────────────────── */
.pagination {
  display: flex;
  justify-content: center;
  margin: var(--sp-8) 0;
  gap: var(--sp-2);
}

.pagination-button {
  padding: 0.42rem 0.85rem;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.pagination-button:hover,
.pagination-button.active {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-color: var(--color-text);
}

.pagination-button.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Loading states ──────────────────────────────────────── */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--sp-3);
  height: 180px;
  width: 100%;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.93rem;
}

.loading i {
  color: var(--color-accent);
  margin-right: 0;
}

.loading-logs,
.loading-followers {
  text-align: center;
  padding: var(--sp-12);
  color: var(--color-muted);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin: var(--sp-5) 0;
  font-family: var(--font-sans);
  font-size: 0.93rem;
  border: 1px solid var(--color-border);
}

.loading-logs i {
  color: var(--color-accent);
  margin-right: var(--sp-2);
  font-size: 1.2rem;
}

/* ── Empty states ────────────────────────────────────────── */
.empty-logs,
.empty-followers,
.empty-state {
  text-align: center;
  padding: var(--sp-16) var(--sp-8);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin: var(--sp-5) 0;
  border: 1px solid var(--color-border);
}

.empty-logs i,
.empty-followers i,
.empty-state i {
  font-size: 2.2rem;
  color: var(--color-muted);
  opacity: 0.35;
  margin-bottom: var(--sp-4);
  display: block;
}

.empty-logs h3,
.empty-followers h3,
.empty-state h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
  margin: var(--sp-2) 0 var(--sp-2);
}

.empty-logs p,
.empty-followers p,
.empty-state p {
  color: var(--color-muted);
  font-size: 0.92rem;
  margin: 0 0 var(--sp-5);
}

.empty-logs .button,
.empty-state .button {
  display: inline-block;
  background-color: var(--color-text);
  color: var(--color-text-inverse);
  padding: 0.6rem var(--sp-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.88rem;
  transition: var(--transition);
}

.empty-logs .button:hover,
.empty-state .button:hover {
  background-color: transparent;
  color: var(--color-text);
  outline: 1.5px solid var(--color-text);
}

/* ── Error / Success messages ────────────────────────────── */
.error-message {
  color: var(--color-danger);
  font-family: var(--font-sans);
  font-size: 0.93rem;
  margin-bottom: var(--sp-4);
  text-align: center;
}

.error-message:not([class*="auth"]):not([style*="display: none"]) {
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-danger-bg);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-danger);
  text-align: left;
}

.success-message {
  color: var(--color-success);
  font-family: var(--font-sans);
  font-size: 0.93rem;
  margin-bottom: var(--sp-4);
}

/* ── Progress bar ────────────────────────────────────────── */
.reading-progress {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-2);
}

.progress-bar {
  flex-grow: 1;
  height: 5px;
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

.progress-text {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-muted);
  white-space: nowrap;
}

/* ── Mobile Bottom Nav ───────────────────────────────────── */
.mobile-bottom-nav,
.mobile-search-overlay,
.mobile-user-tray {
  display: none;
}

@media (max-width: 768px) {
  body { padding-bottom: 64px; }

  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background-color: #FFFFFF;
    border-top: 1px solid var(--color-border);
    z-index: 500;
    align-items: center;
    justify-content: space-around;
    padding-bottom: env(safe-area-inset-bottom);
  }

  .mobile-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-muted);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.68rem;
    font-weight: 500;
    padding: var(--sp-2) var(--sp-5);
    transition: color 0.15s ease;
    flex: 1;
  }

  .mobile-nav-btn i { font-size: 1.25rem; }

  .mobile-nav-btn.active { color: var(--color-accent); }
  .mobile-nav-btn:hover  { color: var(--color-text); }

  .mobile-nav-add {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background-color: var(--color-text);
    color: var(--color-text-inverse) !important;
    flex: unset;
    padding: 0;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: background-color 0.2s ease, transform 0.2s ease;
  }

  .mobile-nav-add i { font-size: 1.4rem !important; }
  .mobile-nav-add span { display: none; }

  .mobile-nav-add:hover {
    background-color: var(--color-accent) !important;
    color: var(--color-text) !important;
    transform: scale(1.08);
  }

  .mobile-search-overlay {
    position: fixed;
    inset: 0;
    background: rgba(27, 42, 74, 0.5);
    z-index: 600;
    align-items: flex-start;
  }

  .mobile-search-overlay.open { display: flex; }

  .mobile-search-sheet {
    background: #FFFFFF;
    width: 100%;
    padding: var(--sp-6) var(--sp-5) var(--sp-8);
    border-radius: 0 0 16px 16px;
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.25s ease;
  }

  .mobile-search-label {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: center;
    margin: 0 0 var(--sp-4);
  }

  .mobile-search-sheet .search-bar {
    max-width: 100%;
    margin: 0;
  }

  /* ── Mobile live-search input & results ── */
  .mobile-search-input-wrap {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: 50px;
    padding: var(--sp-3) var(--sp-5);
    transition: border-color 0.15s;
  }

  .mobile-search-input-wrap:focus-within {
    border-color: var(--color-text);
    background: #fff;
  }

  .mobile-search-input-wrap > i {
    color: var(--color-muted);
    font-size: 0.95rem;
    flex-shrink: 0;
  }

  .mobile-search-input-wrap input {
    flex: 1;
    border: none;
    background: transparent;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--color-text);
    outline: none;
  }

  .mobile-search-input-wrap input::placeholder {
    color: var(--color-muted);
  }

  .mobile-search-clear {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-muted);
    padding: 0;
    display: none;
    align-items: center;
    font-size: 0.85rem;
    transition: color 0.15s;
  }

  .mobile-search-clear.visible { display: flex; }
  .mobile-search-clear:hover { color: var(--color-text); }

  .mobile-search-results {
    list-style: none;
    margin: var(--sp-3) 0 0;
    padding: 0;
    max-height: 320px;
    overflow-y: auto;
  }

  .mobile-search-results li {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-3) var(--sp-2);
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.12s;
    text-decoration: none;
  }

  .mobile-search-results li + li {
    border-top: 1px solid var(--color-border-subtle);
  }

  .mobile-search-results li:hover,
  .mobile-search-results li:active {
    background: var(--color-surface);
  }

  .mobile-search-result-cover {
    width: 38px;
    height: 54px;
    object-fit: cover;
    border-radius: 4px;
    flex-shrink: 0;
    background: var(--color-surface);
  }

  .mobile-search-result-cover-placeholder {
    width: 38px;
    height: 54px;
    border-radius: 4px;
    background: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-size: 1rem;
    flex-shrink: 0;
  }

  .mobile-search-result-info {
    flex: 1;
    min-width: 0;
  }

  .mobile-search-result-title {
    font-family: var(--font-serif);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .mobile-search-result-author {
    font-size: 0.76rem;
    color: var(--color-muted);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .mobile-search-results-empty {
    text-align: center;
    padding: var(--sp-5) var(--sp-4);
    color: var(--color-muted);
    font-size: 0.88rem;
  }

  .mobile-search-results-loading {
    text-align: center;
    padding: var(--sp-4);
    color: var(--color-muted);
    font-size: 0.85rem;
    font-style: italic;
  }

  /* ── Mobile user tray ── */
  .mobile-user-tray {
    display: block;
    position: fixed;
    top: 70px;
    right: var(--sp-4);
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    z-index: 550;
    min-width: 190px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-6px) scale(0.97);
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
  }

  .mobile-user-tray.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }

  .mobile-user-tray-header {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-4) var(--sp-4) var(--sp-3);
  }

  .mobile-user-tray-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--color-text);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 600;
    flex-shrink: 0;
  }

  .mobile-user-tray-name {
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .mobile-user-tray-sep {
    height: 1px;
    background: var(--color-border);
    margin: 0;
  }

  .mobile-user-tray-item {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: 0.72rem var(--sp-4);
    color: var(--color-text);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 500;
    transition: background 0.12s;
  }

  .mobile-user-tray-item:hover,
  .mobile-user-tray-item:active {
    background: var(--color-surface);
  }

  .mobile-user-tray-item--danger { color: var(--color-danger); }
  .mobile-user-tray-item--danger:hover { background: var(--color-danger-bg); }

  /* ── Favorites grid on profile ── */
  .favorites-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--sp-3);
    margin-bottom: var(--sp-6);
  }

  .favorites-grid .book-cover-wrap {
    aspect-ratio: 2/3;
    border-radius: 6px;
    overflow: hidden;
    background: var(--color-surface);
  }

  .favorites-grid .book-cover-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
}

/* ── Profile Favorites ───────────────────────────────────── */
.profile-favorites-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-3);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.profile-favorites-grid .fav-book {
  display: block;
  width: 100%;
  aspect-ratio: 2/3;
  border-radius: 6px;
  overflow: hidden;
  background: var(--color-surface);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.profile-favorites-grid .fav-book:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.profile-favorites-grid .fav-book img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── Settings page ───────────────────────────────────────── */
.settings-page {
  max-width: 560px;
  margin: var(--sp-8) auto;
  padding: 0 var(--sp-4);
}

.settings-page h1 {
  font-size: 1.6rem;
  margin-bottom: var(--sp-6);
}

.settings-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  margin-bottom: var(--sp-5);
}

.settings-card h2 {
  font-size: 1.05rem;
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--color-border-subtle);
}

.settings-field { margin-bottom: var(--sp-4); }

.settings-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-2);
}

.settings-field input {
  width: 100%;
  padding: 0.65rem var(--sp-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.15s;
  box-sizing: border-box;
}

.settings-field input:focus {
  outline: none;
  border-color: var(--color-text);
  background: #fff;
}

.settings-save-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.6rem var(--sp-5);
  background: var(--color-text);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}

.settings-save-btn:hover { background: var(--color-accent); color: var(--color-text); }
.settings-save-btn:active { transform: scale(0.97); }

.settings-msg {
  margin-top: var(--sp-3);
  font-size: 0.85rem;
  min-height: 1.2em;
}
.settings-msg.ok  { color: var(--color-success); }
.settings-msg.err { color: var(--color-danger); }

/* Favorites slot grid */
.fav-slots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.fav-slot {
  aspect-ratio: 2/3;
  border-radius: 6px;
  overflow: hidden;
  border: 2px dashed var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.fav-slot:hover { border-color: var(--color-muted); }

.fav-slot.active {
  border-color: var(--color-accent);
  border-style: solid;
  box-shadow: 0 0 0 3px rgba(212,160,23,0.2);
}

.fav-slot.filled { border-style: solid; border-color: transparent; }

.fav-slot img { width: 100%; height: 100%; object-fit: cover; display: block; }

.fav-slot-add { font-size: 1.4rem; color: var(--color-muted); }

.fav-slot-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0,0,0,0.55);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.15s;
}

.fav-slot:hover .fav-slot-remove { opacity: 1; }

.fav-search-wrap {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 50px;
  padding: var(--sp-2) var(--sp-4);
  margin-bottom: var(--sp-2);
  transition: border-color 0.15s;
}

.fav-search-wrap:focus-within { border-color: var(--color-text); background: #fff; }
.fav-search-wrap i { color: var(--color-muted); font-size: 0.9rem; }

.fav-search-wrap input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--color-text);
  outline: none;
  padding: 0;
}

.fav-search-results {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  display: none;
}

.fav-search-results.visible { display: block; }

.fav-search-results li {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  cursor: pointer;
  transition: background 0.1s;
}

.fav-search-results li:hover { background: var(--color-surface); }
.fav-search-results li + li { border-top: 1px solid var(--color-border-subtle); }

.fav-search-results img {
  width: 32px;
  height: 48px;
  object-fit: cover;
  border-radius: 3px;
  flex-shrink: 0;
}

.fav-search-results .res-info { flex: 1; min-width: 0; }

.fav-search-results .res-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fav-search-results .res-author {
  font-size: 0.76rem;
  color: var(--color-muted);
}

.fav-search-hint {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-bottom: var(--sp-4);
}

/* ── Utility ─────────────────────────────────────────────── */
.hidden { display: none; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 var(--sp-4); }

  header, .main-header {
    padding: var(--sp-3) var(--sp-4);
    justify-content: center;
  }

  .main-nav { display: none; }
  .nav-search { display: none; }

  .hero-section {
    flex-direction: column;
    padding: var(--sp-10) var(--sp-5);
    text-align: center;
  }

  .hero-title { font-size: 2.2rem; }
  .hero-decoration { display: none; }

  .search-bar {
    flex-direction: column;
    max-width: 100%;
  }

  .search-button {
    justify-content: center;
    padding: 0.85rem var(--sp-4);
    width: 100%;
  }

  .book-detail {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    padding: var(--sp-5);
  }

  .book-detail .book-cover-container {
    justify-content: center;
  }

  .action-buttons { flex-direction: column; }
  .action-button { width: 100%; justify-content: center; }

  .profile-header {
    flex-direction: column;
    text-align: center;
    padding: var(--sp-6) 0;
    gap: var(--sp-4);
  }

  .avatar { margin: 0 auto; }
  .social-stats { justify-content: center; flex-wrap: wrap; }

  .stats { grid-template-columns: 1fr 1fr; }

  .features-section {
    padding: var(--sp-12) var(--sp-5);
    margin: 0;
  }

  .features-grid { grid-template-columns: 1fr; }

  .log-header { flex-direction: column; }
  .log-meta { align-items: flex-start; }

  .log-filters {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
  }

  .sort-options { width: 100%; justify-content: space-between; }

  .follower-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .follow-actions { width: 100%; justify-content: space-between; }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
  }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--sp-4);
  }

  footer { margin-top: var(--sp-12); }
}

@media (max-width: 480px) {
  header, .main-header {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--sp-3);
  }

  .hero-title { font-size: 1.85rem; }

  .modal-content {
    padding: var(--sp-5);
    margin: 0 var(--sp-3);
    border-radius: var(--radius);
  }

  .stats { grid-template-columns: 1fr; }
  .book-meta { flex-direction: column; gap: var(--sp-2); }

  .books-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-3);
  }
}