/* ==========================================
   MAIN CSS v2 — phanhuynh.id.vn
   Premium Book CV + Light/Dark modes
   ========================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===== THEME TOKENS ===== */
:root {
  --primary: #1a2744;
  --accent: #c9a84c;
  --accent-glow: rgba(201,168,76,0.25);
  --gold-gradient: linear-gradient(135deg, #c9a84c, #e8d08a, #c9a84c);
  --font-display: 'Inter', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'Inter', -apple-system, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -- Dark Mode (default) -- */
[data-theme="dark"] {
  --bg-scene: radial-gradient(ellipse at 30% 20%, #0d1b35 0%, #060d1a 100%);
  --bg-header: rgba(10,18,40,0.88);
  --bg-nav: rgba(10,18,40,0.82);
  --page-bg: #f5f0e8;
  --page-bg-l: linear-gradient(to right, #e8e0d0, #f0ead8);
  --page-bg-r: linear-gradient(to left, #e8e0d0, #f0ead8);
  --page-shadow-l: inset -6px 0 20px rgba(0,0,0,0.12);
  --page-shadow-r: inset 6px 0 20px rgba(0,0,0,0.12);
  --page-text: #2c2c2c;
  --page-text-dim: #666;
  --cover-bg: linear-gradient(145deg, #1a2744 0%, #0d1b35 100%);
  --cover-text: #fff;
  --cover-text-dim: rgba(255,255,255,0.55);
  --header-text: rgba(255,255,255,0.7);
  --header-text-hover: var(--accent);
  --header-border: rgba(201,168,76,0.2);
  --nav-text: rgba(255,255,255,0.7);
  --particle-color: rgba(201,168,76,0.12);
  --card-bg: rgba(26,39,68,0.06);
  --card-border: rgba(26,39,68,0.12);
  --tag-bg: var(--primary);
  --tag-text: #fff;
  --contact-card-bg: linear-gradient(135deg, var(--primary), #0d1b35);
  --back-cover-bg: linear-gradient(145deg, #0d1b35, #060d1a);
  --scrollbar-thumb: var(--accent);
  --yt-overlay: rgba(0,0,0,0.85);
}

/* -- Light Mode -- */
[data-theme="light"] {
  --bg-scene: linear-gradient(160deg, #f0ebe3 0%, #d5c4a1 40%, #c2b280 100%);
  --bg-header: rgba(245,240,232,0.92);
  --bg-nav: rgba(245,240,232,0.88);
  --page-bg: #fffdf8;
  --page-bg-l: linear-gradient(to right, #faf5ec, #fffdf8);
  --page-bg-r: linear-gradient(to left, #faf5ec, #fffdf8);
  --page-shadow-l: inset -6px 0 20px rgba(0,0,0,0.06);
  --page-shadow-r: inset 6px 0 20px rgba(0,0,0,0.06);
  --page-text: #1e1e1e;
  --page-text-dim: #777;
  --cover-bg: linear-gradient(145deg, #1a2744, #2a3f6f);
  --cover-text: #fff;
  --cover-text-dim: rgba(255,255,255,0.6);
  --header-text: #5a4e3a;
  --header-text-hover: var(--primary);
  --header-border: rgba(26,39,68,0.12);
  --nav-text: #5a4e3a;
  --particle-color: rgba(26,39,68,0.06);
  --card-bg: rgba(26,39,68,0.04);
  --card-border: rgba(26,39,68,0.1);
  --tag-bg: var(--primary);
  --tag-text: #fff;
  --contact-card-bg: linear-gradient(135deg, var(--primary), #2a3f6f);
  --back-cover-bg: linear-gradient(145deg, #1a2744, #0d1b35);
  --scrollbar-thumb: #bba66e;
  --yt-overlay: rgba(0,0,0,0.75);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg-scene);
  font-family: var(--font-body);
  color: var(--page-text);
  transition: background var(--transition);
}

/* ===== PARTICLES ===== */
#particles-bg {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  overflow: hidden;
}
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--particle-color);
  animation: floatParticle linear infinite;
}
@keyframes floatParticle {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 0.4; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* ===== SCENE ===== */
#scene {
  position: relative; z-index: 1;
  width: 100vw; height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 18px;
}

/* ===== HEADER ===== */
#header-bar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 28px;
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--header-border);
  transition: background var(--transition), border var(--transition);
}
#header-bar .logo {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 1px;
}
#header-bar .nav-links {
  display: flex; gap: 20px; list-style: none;
}
#header-bar .nav-links a {
  color: var(--header-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  cursor: pointer;
  position: relative;
}
#header-bar .nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
#header-bar .nav-links a:hover { color: var(--header-text-hover); }
#header-bar .nav-links a:hover::after { transform: scaleX(1); }

/* Header controls (theme toggle + lang toggle) */
.header-controls {
  display: flex; align-items: center; gap: 8px;
}
.ctrl-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--header-border);
  background: transparent;
  color: var(--header-text);
  font-size: 1.05rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  position: relative;
}
.ctrl-btn:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.1);
}
.lang-btn {
  width: auto;
  padding: 0 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* ===== BOOK CONTAINER ===== */
#book-container {
  margin-top: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2200px;
  width: 100%;
  height: calc(100vh - 125px);
}

#stf-book {
  position: relative;
  filter: drop-shadow(0 20px 60px rgba(0,0,0,0.35));
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Cover centering: slide book so single cover page appears centered */
#stf-book.cover-center-start {
  transform: translateX(-25%);
}
#stf-book.cover-center-end {
  transform: translateX(25%);
}
#stf-book.cover-center-none {
  transform: translateX(0);
}
/* Prevent drag-flipping: block pointer on the StPageFlip wrapper layer */
#stf-book .stf__parent {
  pointer-events: none;
}
/* But allow inner content (links, buttons) to remain clickable */
#stf-book .stf__parent .stf__block,
#stf-book .stf__parent .stf__item {
  pointer-events: auto;
}
[data-theme="light"] #stf-book {
  filter: drop-shadow(0 15px 45px rgba(0,0,0,0.18));
}

/* ===== PAGES ===== */
.page {
  background-color: var(--page-bg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border-radius: 6px;
}
.page-left {
  background: var(--page-bg-l);
  box-shadow: var(--page-shadow-l);
}
.page-right {
  background: var(--page-bg-r);
  box-shadow: var(--page-shadow-r);
}

/* Page inner */
.page-inner {
  padding: 48px 44px;
  height: 100%;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
  color: var(--page-text);
}
.page-inner::-webkit-scrollbar { width: 4px; }
.page-inner::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }

.page-header {
  border-bottom: 2px solid var(--accent);
  margin-bottom: 28px;
  padding-bottom: 14px;
}
.page-title {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--primary);
  font-weight: 700;
}
.page-subtitle {
  font-size: 0.85rem;
  color: var(--page-text-dim);
  letter-spacing: 2.5px;
  text-transform: uppercase;
  margin-top: 4px;
  font-weight: 500;
}

/* ===== COVER PAGE ===== */
.cover-page {
  background: var(--cover-bg) !important;
  position: relative;
  overflow: hidden;
}
.cover-page::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 25% 45%, rgba(201,168,76,0.08) 0%, transparent 55%),
    radial-gradient(circle at 75% 75%, rgba(79,142,247,0.05) 0%, transparent 45%);
  pointer-events: none;
}
.cover-page::after {
  content: '';
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    45deg, transparent, transparent 40px,
    rgba(201,168,76,0.015) 40px, rgba(201,168,76,0.015) 41px
  );
  pointer-events: none;
}
.cover-content {
  position: relative;
  width: 100%;
  min-height: 100%;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 50px 40px;
}
.cover-avatar {
  width: var(--avatar-size-desktop, 105px);
  height: var(--avatar-size-desktop, 105px);
  border-radius: 50%;
  margin: 0 auto 18px;
  border: 3px solid var(--accent);
  background: linear-gradient(135deg, #2a3f6f, #1a2744);
  display: flex; align-items: center; justify-content: center;
  font-size: 2.8rem;
  box-shadow: 0 0 40px rgba(201,168,76,0.25), 0 0 0 8px rgba(201,168,76,0.08);
  overflow: hidden;
  transition: transform 0.5s;
}
.cover-avatar:hover { transform: scale(1.05); }
.cover-avatar img { width: 100%; height: 100%; object-fit: cover; }
.cover-name {
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--cover-text);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
}
.cover-title {
  font-size: 1rem;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  margin-bottom: 22px;
  font-weight: 600;
}
.cover-divider {
  width: 50px; height: 2px;
  background: var(--gold-gradient);
  margin: 0 auto 16px;
  border-radius: 2px;
}
.cover-tagline {
  color: var(--cover-text-dim);
  font-size: 1.05rem;
  font-style: italic;
  line-height: 1.6;
  max-width: 420px;
  margin: 0 auto;
}
.cover-links {
  margin-top: 28px;
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}
.cover-link {
  display: flex; align-items: center; gap: 6px;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 8px 18px;
  border: 1px solid rgba(201,168,76,0.25);
  border-radius: 22px;
  transition: all var(--transition);
  font-weight: 500;
}
.cover-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(201,168,76,0.08);
  transform: translateY(-2px);
}
.cover-page-hint {
  margin-top: 28px;
  color: rgba(255,255,255,0.25);
  font-size: 0.72rem;
  animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:0.25} 50%{opacity:0.7} }

/* ===== ABOUT ===== */
.about-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--page-text);
  margin-bottom: 24px;
}
.info-grid {
  display: grid; gap: 10px;
}
.info-item {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.95rem;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  transition: all var(--transition);
}
.info-item:hover { transform: translateX(4px); }
.info-item i { color: var(--accent); width: 18px; flex-shrink: 0; }
.info-item a { color: var(--primary); text-decoration: none; font-weight: 500; }
.info-item a:hover { color: var(--accent); }

/* ===== SKILLS ===== */
.skill-group { margin-bottom: 22px; }
.skill-category {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 9px;
  display: flex; align-items: center; gap: 8px;
}
.skill-category::before {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}
.skill-tags {
  display: flex; flex-wrap: wrap; gap: 7px;
}
.skill-tag {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.88rem;
  font-weight: 500;
  background: var(--card-bg);
  color: var(--primary);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
  cursor: default;
}
.skill-tag:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 3px 10px rgba(26,39,68,0.2);
}

/* ===== TIMELINE ===== */
.timeline { position: relative; padding-left: 22px; }
.timeline::before {
  content: '';
  position: absolute; left: 6px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--card-border));
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  margin-bottom: 20px;
  padding: 18px 20px;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
}
.timeline-item:hover {
  border-color: var(--accent);
  transform: translateX(3px);
}
.timeline-item::before {
  content: '';
  position: absolute; left: -22px; top: 20px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--page-bg);
  box-shadow: 0 0 8px var(--accent-glow);
}
.timeline-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 3px;
}
.company-link {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}
.company-link:hover {
  color: var(--accent);
  text-decoration: underline;
}
.company-link i {
  font-size: 0.9rem;
  color: var(--accent);
}
.timeline-sub {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
}
.timeline-period {
  font-size: 0.82rem;
  color: var(--page-text-dim);
  margin: 4px 0 6px;
  display: flex; align-items: center; gap: 5px;
}
.timeline-desc {
  font-size: 0.95rem;
  color: var(--page-text);
  line-height: 1.65;
  opacity: 0.85;
}
.tag-list { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 8px; }
.tag {
  font-size: 0.78rem;
  padding: 3px 10px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 10px;
  font-weight: 500;
}

/* ===== PROJECTS ===== */
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 16px;
  transition: all var(--transition);
}
.project-card:hover {
  border-color: var(--accent);
  background: rgba(201,168,76,0.04);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}
.project-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}
.project-desc {
  font-size: 0.9rem;
  color: var(--page-text);
  line-height: 1.55;
  margin-bottom: 10px;
  opacity: 0.8;
}

/* YouTube Play Button (small icon) */
.btn-yt-play {
  background: #cc0000;
  color: #fff;
}
.btn-yt-play:hover {
  background: #ff0000;
  transform: translateY(-1px);
  box-shadow: 0 3px 12px rgba(255,0,0,0.3);
}
.btn-yt-play i { font-size: 0.85rem; }

.project-actions {
  display: flex; gap: 8px; flex-wrap: wrap;
}
.btn-action {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  border: none;
}
.btn-github {
  background: var(--primary);
  color: #fff;
}
.btn-github:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== FULLSCREEN VIDEO MODAL ===== */
#video-modal {
  position: fixed; inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.35s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
#video-modal.active {
  opacity: 1;
  visibility: visible;
}
#video-modal-close {
  position: absolute;
  top: 18px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  z-index: 10;
}
#video-modal-close:hover {
  background: rgba(255,0,0,0.6);
  border-color: rgba(255,0,0,0.8);
  transform: scale(1.1) rotate(90deg);
}
#video-modal-title {
  color: rgba(255,255,255,0.7);
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 14px;
  text-align: center;
  max-width: 80%;
}
#video-modal-frame {
  width: 88vw;
  max-width: 1100px;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 0 80px rgba(0,0,0,0.5);
  background: #000;
}
#video-modal-frame iframe {
  width: 100%; height: 100%;
  border: none;
}

/* ===== CONTACT ===== */
.contact-card {
  background: var(--contact-card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: #fff;
  text-align: center;
  margin-bottom: 18px;
}
.contact-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.contact-card p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}
.contact-list { display: grid; gap: 8px; }
.contact-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
}
.contact-item:hover { border-color: var(--accent); transform: translateX(3px); }
.contact-item i { color: var(--accent); font-size: 0.95rem; width: 18px; flex-shrink: 0; }
.contact-item a, .contact-item span {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  word-break: break-all;
}
.contact-item a:hover { color: var(--accent); }

/* ===== BACK COVER ===== */
.back-cover {
  background: var(--back-cover-bg) !important;
  position: relative;
}
.back-cover-content {
  position: relative;
  width: 100%;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: rgba(255,255,255,0.3);
  padding: 30px;
}
.back-cover-content .logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.back-cover-content p { font-size: 0.8rem; }

/* ===== NAVIGATION CONTROLS ===== */
#book-nav {
  display: flex; align-items: center; gap: 14px;
  padding: 8px 18px;
  background: var(--bg-nav);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 40px;
  border: 1px solid var(--header-border);
  transition: background var(--transition), border var(--transition);
}
.nav-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--header-border);
  background: transparent;
  color: var(--accent);
  font-size: 0.95rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.nav-btn:hover:not(:disabled) {
  background: var(--accent-glow);
  border-color: var(--accent);
  transform: scale(1.12);
}
.nav-btn:disabled { opacity: 0.25; cursor: not-allowed; }
#page-indicator {
  color: var(--nav-text);
  font-size: 0.8rem;
  min-width: 70px;
  text-align: center;
  font-weight: 500;
  font-family: var(--font-mono);
}
.dot-nav { display: flex; gap: 5px; }
.dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: rgba(201,168,76,0.25);
  cursor: pointer;
  transition: all var(--transition);
}
.dot.active {
  background: var(--accent);
  transform: scale(1.4);
  box-shadow: 0 0 6px var(--accent-glow);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  html, body {
    overflow-y: auto !important;
    overflow-x: hidden !important;
    height: auto !important;
  }
  #scene {
    height: auto !important;
    min-height: 100vh !important;
    justify-content: flex-start !important;
  }

  .page-inner { padding: 22px 18px; }
  .cover-name { font-size: 1.4rem; }
  #header-bar { padding: 8px 14px; }
  #header-bar .nav-links { display: none; }
  .cover-avatar {
    width: var(--avatar-size-mobile, 85px) !important;
    height: var(--avatar-size-mobile, 85px) !important;
  }
  #video-modal-frame { width: 95vw; }

  /* Allow book-container to scroll vertically on mobile */
  #book-container {
    height: auto !important;
    overflow-y: visible !important;
    display: block !important;
    padding: 16px 16px 80px 16px !important;
    margin-top: 56px !important;
  }
  
  /* Stack the book pages vertically */
  #stf-book {
    width: 100% !important;
    height: auto !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 24px !important;
    filter: none !important; /* Remove 3D drop shadow */
  }

  /* Make pages act as standard vertical cards */
  .page {
    width: 100% !important;
    height: auto !important;
    min-height: auto !important;
    position: relative !important;
    border-radius: var(--radius-md) !important;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08) !important;
    background: var(--page-bg);
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
  }

  /* Reset separate left/right page styling on mobile */
  .page-left, .page-right {
    background: var(--page-bg) !important;
    box-shadow: none !important;
  }

  .page-inner {
    overflow-y: visible !important;
    height: auto !important;
    padding: 28px 22px !important;
  }

  /* Hide book pagination controls on mobile */
  #book-nav {
    display: none !important;
  }

  /* ====== MOBILE TYPOGRAPHY OVERRIDES ====== */
  #header-bar .logo { font-size: 1.15rem; }
  .ctrl-btn { width: 36px; height: 36px; font-size: 0.9rem; }
  .lang-btn { font-size: 0.75rem; padding: 0 12px; }
  
  .page-title { font-size: 1.5rem; }
  .page-subtitle { font-size: 0.7rem; margin-top: 2px; }
  
  .cover-title { font-size: 0.8rem; margin-bottom: 18px; }
  .cover-tagline { font-size: 0.88rem; }
  .cover-link { font-size: 0.76rem; padding: 6px 14px; }
  
  .about-text { font-size: 0.9rem; margin-bottom: 20px; }
  .info-item { font-size: 0.82rem; padding: 9px 14px; gap: 10px; }
  .info-item i { width: 16px; }
  
  .skill-category { font-size: 0.72rem; }
  .skill-tag { font-size: 0.75rem; padding: 4px 11px; }
  
  .timeline-title { font-size: 0.95rem; }
  .company-link i { font-size: 0.8rem; }
  .timeline-sub { font-size: 0.78rem; }
  .timeline-period { font-size: 0.72rem; margin: 3px 0 5px; }
  .timeline-desc { font-size: 0.8rem; line-height: 1.6; }
  .tag { font-size: 0.68rem; padding: 2px 8px; }
  
  .project-card .project-name { font-size: 0.95rem !important; margin-bottom: 5px !important; }
  .project-card .project-desc-short { font-size: 0.78rem !important; }
  .project-card .project-read-more { font-size: 0.75rem !important; }
  
  #projects-detail-container h3 { font-size: 1.1rem !important; margin-bottom: 2px !important; }
  #projects-detail-container > div > div:first-child > div > span { font-size: 0.7rem !important; }
  #projects-detail-container .rich-text-container { font-size: 0.85rem !important; }
  
  .back-cover-content h2 { font-size: 1.5rem !important; margin-bottom: 10px !important; }
  .back-cover-content > p { font-size: 0.85rem !important; margin-bottom: 24px !important; }
  .back-contact-item { font-size: 0.82rem !important; gap: 10px !important; }
  .back-contact-item i { font-size: 1rem !important; width: 16px !important; }
  .back-cover-content > div:last-child > div:nth-child(1) { font-size: 0.95rem !important; }
  .back-cover-content > div:last-child > div:nth-child(2) { font-size: 0.75rem !important; }
  .back-cover-content > div:last-child > p { font-size: 0.65rem !important; }

  /* Center cover contents correctly */
  .cover-page {
    min-height: 460px !important;
    display: flex !important;
  }
  .cover-content {
    position: relative !important;
    height: auto !important;
    flex: 1;
  }
  
  .back-cover {
    min-height: auto !important;
    display: flex !important;
  }
  .back-cover-content {
    position: relative !important;
    height: auto !important;
    flex: 1;
  }
}

/* ===== FIX STPAGEFLIP RENDER BUGS ===== */
body.at-end .cover-page {
  visibility: hidden !important;
  opacity: 0 !important;
}
body.at-start .back-cover {
  visibility: hidden !important;
  opacity: 0 !important;
}

/* Cover page rounded corners */
.cover-page {
  border-radius: 6px !important;
}
.back-cover {
  border-radius: 6px !important;
}

/* ===== IMAGE VIEWER MODAL ===== */
#image-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 20px;
}
#image-modal-close {
  position: absolute;
  top: 20px;
  right: 25px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
}
#image-modal-close:hover {
  color: var(--accent);
}
#image-modal-content {
  width: 90vw;
  height: 85vh;
  object-fit: contain;
}
#image-modal-caption {
  margin-top: 15px;
  color: #ccc;
  font-size: 0.95rem;
  text-align: center;
  font-weight: 500;
}

/* ===== PREMIUM PROJECT GALLERY WIDGET ===== */
.gallery-main-wrapper:hover .gallery-zoom-overlay {
  opacity: 1 !important;
}
.gallery-thumb-item:hover {
  transform: scale(1.05);
  border-color: var(--accent) !important;
}
.gallery-thumb-row::-webkit-scrollbar {
  height: 4px;
}
.gallery-thumb-row::-webkit-scrollbar-track {
  background: transparent;
}
.gallery-thumb-row::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

/* Scrollbar for gallery-grid */
.gallery-grid::-webkit-scrollbar {
  width: 6px;
}
.gallery-grid::-webkit-scrollbar-track {
  background: transparent;
}
.gallery-grid::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.15);
  border-radius: 3px;
}
.gallery-grid::-webkit-scrollbar-thumb:hover {
  background: rgba(0,0,0,0.25);
}

@media (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: 1fr;
    max-height: none;
    overflow-y: visible;
  }
}

/* ===== PROJECT MASTER-DETAIL STYLES ===== */
.project-card {
  cursor: pointer;
  transition: all 0.25s ease !important;
  border-left: 3px solid transparent !important;
}
.project-card:hover {
  transform: translateY(-1px);
  border-color: var(--accent) !important;
  background: rgba(255, 255, 255, 0.05);
}
.project-card.active {
  border-color: var(--accent) !important;
  border-left: 3px solid var(--accent) !important;
  background: rgba(201, 168, 76, 0.08) !important;
}
.project-read-more i {
  transition: transform 0.2s ease;
}
.project-card:hover .project-read-more i {
  transform: translateX(3px);
}


/* Operation video preview frame */
.video-preview-frame img {
  transition: transform 0.3s ease;
}
.video-preview-frame:hover img {
  transform: scale(1.03);
}
.video-preview-frame div > div {
  transition: transform 0.2s ease, background-color 0.25s ease;
}
.video-preview-frame:hover div > div {
  transform: scale(1.1);
  background-color: #ff0000 !important;
}

/* Simple fade in animation for details */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== RICH TEXT EDITOR STYLES ===== */
.rich-text-container h1, .rich-text-container h2, .rich-text-container h3 {
  color: var(--primary);
  margin-top: 10px;
  margin-bottom: 5px;
  font-family: var(--font-display);
}
.rich-text-container p {
  margin-bottom: 8px;
}
.rich-text-container ul, .rich-text-container ol {
  padding-left: 20px;
  margin-bottom: 10px;
}
.rich-text-container li {
  margin-bottom: 4px;
}
.rich-text-container a {
  color: var(--accent);
  text-decoration: underline;
}
.rich-text-container .ql-align-center {
  text-align: center;
}
.rich-text-container .ql-align-right {
  text-align: right;
}
.rich-text-container .ql-align-justify {
  text-align: justify;
}
.rich-text-container .ql-size-small {
  font-size: 0.75em;
}
.rich-text-container .ql-size-large {
  font-size: 1.5em;
}
.rich-text-container .ql-size-huge {
  font-size: 2.5em;
}

/* Global Font Override */
body, input, button, textarea, select, .rich-text-container * {
  font-family: "Inter", -apple-system, sans-serif !important;
}