/* CSS Variables - 品牌色彩系統（源自吳榮寶石釉真實釉色：胭脂紅=黃金發色／銅綠／鐵黃／錳紫，見碩論 glaze-yanzhi、glaze-baoshi） */
:root {
  /* 主色調 — 寶石釉礦物發色 */
  --crimson-red: #96313A;      /* 胭脂紅：黃金發色的寶石釉紅 */
  --ink-black: #262220;        /* 墨黑：暖調陶土黑，非純黑 */
  --paper-white: #F7F2E9;      /* 宣紙白：暖調米白，非純白 */
  --emperor-gold: #B3812E;     /* 鐵黃：氧化鐵釉色 */
  --jade-green: #3E6350;       /* 銅綠：氧化銅釉色 */
  --glaze-cobalt: #33506E;     /* 鈷藍：氧化鈷釉色，局部強調用 */
  --glaze-plum: #6B3B52;       /* 錳紫：氧化錳釉色，局部強調用（非漸層背景） */

  /* 輔助色 */
  --text-primary: #1C1917;
  --text-secondary: #4A433D;
  --border-color: #E2DACB;

  /* 字體 */
  --font-serif: 'Noto Serif TC', serif;
  --font-sans: 'Noto Sans TC', sans-serif;

  /* 間距 */
  --section-padding: 8rem 0;
  --container-padding: 0 2rem;

  /* 動畫時間 */
  --transition-slow: 1000ms;
  --transition-medium: 300ms;
  --transition-fast: 150ms;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--paper-white);
  line-height: 1.8;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast) ease;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(250, 250, 249, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  transition: transform var(--transition-medium) ease;
}

.nav.hidden {
  transform: translateY(-100%);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand a {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--crimson-red);
  letter-spacing: 0.05em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--ink-black);
  transition: var(--transition-fast);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 3rem;
  align-items: center;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--crimson-red);
  transition: width var(--transition-medium) ease;
}

.nav-link:hover {
  color: var(--crimson-red);
}

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

/* Hero Section - Heavy Block */
.hero {
  position: relative;
  height: 88vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(150deg,
    var(--crimson-red) 0%,
    var(--glaze-plum) 55%,
    var(--ink-black) 100%);
  background-size: 400% 400%;
  animation: gradientShift 18s ease infinite;
  overflow: hidden;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url('assets/stock/hero.jpg') center/cover no-repeat;
  opacity: 0.15;
  mix-blend-mode: overlay;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--paper-white);
  max-width: 900px;
  padding: 0 2rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.5rem);
  letter-spacing: 0.3em;
  opacity: 0.8;
  border-top: 1px solid rgba(255,255,255,0.3);
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding: 1rem 0;
  display: inline-block;
}

.scroll-indicator {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 50px;
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 10px;
}

.scroll-indicator span {
  width: 4px;
  height: 10px;
  background: rgba(255,255,255,0.8);
  border-radius: 2px;
  animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
  0%, 100% { transform: translateY(0); opacity: 0; }
  50% { transform: translateY(15px); opacity: 1; }
}

/* Empty Block - 輕量區塊 */
.empty-block {
  padding: 10rem 0;
  background: var(--paper-white);
}

.art-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.8;
  text-align: center;
  color: var(--text-secondary);
  border: none;
  max-width: 800px;
  margin: 0 auto;
  font-style: italic;
}

.single-line-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 4rem);
  font-weight: 600;
  text-align: center;
  color: var(--crimson-red);
  letter-spacing: 0.1em;
  max-width: 900px;
  margin: 0 auto;
}

.empty-block-image {
  position: relative;
  height: 80vh;
  background: var(--ink-black);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.full-image {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.6;
}

.image-overlay-text {
  position: relative;
  z-index: 2;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 5rem);
  color: var(--paper-white);
  text-align: center;
  font-weight: 300;
  letter-spacing: 0.15em;
  text-shadow: 0 4px 30px rgba(0,0,0,0.8);
}

/* Section Common Styles - Heavy Block */
.lineage-section,
.alchemy-section,
.collections-section,
.bespoke-section {
  padding: 8rem 0;
  background: var(--paper-white);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--ink-black);
  line-height: 1.3;
  margin-bottom: 3rem;
}

.section-title.center {
  text-align: center;
}

.section-title-en {
  display: block;
  font-size: 0.5em;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.2em;
  margin-top: 0.5rem;
  text-transform: uppercase;
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .section-grid {
    grid-template-columns: 1fr 1fr;
  }

  .section-grid.reverse {
    direction: rtl;
  }

  .section-grid.reverse > * {
    direction: ltr;
  }
}

.section-content {
  padding: 0 1rem;
}

.section-visual {
  position: relative;
}

.visual-image {
  width: 100%;
  aspect-ratio: 4/3;
  background-size: cover;
  background-position: center;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.visual-caption {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 1rem;
  font-style: italic;
}

/* Timeline */
.timeline {
  margin: 3rem 0;
  border-left: 2px solid var(--crimson-red);
  padding-left: 2rem;
  position: relative;
}

.timeline-item {
  margin-bottom: 3rem;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--crimson-red);
  border: 3px solid var(--paper-white);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--crimson-red);
}

.timeline-year {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--crimson-red);
  margin-bottom: 0.5rem;
}

.timeline-content h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 0.5rem;
}

.timeline-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.award-photo {
  margin-top: 2.5rem;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.award-photo img {
  width: 100%;
  display: block;
}

.award-photo .visual-caption {
  padding: 0.75rem 0 0;
}

/* Academic Credential */
.academic-credential {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: linear-gradient(135deg, #FFF9F0 0%, #FFF5E6 100%);
  padding: 2rem;
  border-radius: 8px;
  border-top: 2px solid var(--emperor-gold);
  margin-top: 3rem;
}

.credential-icon {
  color: var(--emperor-gold);
  line-height: 1;
}

.credential-icon svg {
  width: 2.75rem;
  height: 2.75rem;
}

.credential-text h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 0.5rem;
}

.credential-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Alchemy Section */
.tech-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin: 3rem 0;
}

@media (min-width: 768px) {
  .tech-features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tech-item {
  text-align: center;
  padding: 2rem;
  background: linear-gradient(135deg, #F5F5F5 0%, #EBEBEB 100%);
  border-radius: 8px;
  transition: transform var(--transition-medium) ease, box-shadow var(--transition-medium) ease;
}

.tech-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.tech-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 900;
  color: var(--crimson-red);
  margin-bottom: 1rem;
}

.tech-item h4 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 1rem;
}

.tech-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.material-innovation,
.process-description {
  margin-top: 3rem;
  padding: 2rem;
  background: linear-gradient(135deg, #FFF 0%, #F8F8F8 100%);
  border-top: 2px solid var(--jade-green);
  border-radius: 4px;
}

.material-innovation h3,
.process-description h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 1rem;
}

.material-innovation p,
.process-description p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Collections Section */
.collections-intro {
  max-width: 800px;
  margin: 0 auto 5rem;
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.series-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 6rem;
  padding-bottom: 6rem;
  border-bottom: 1px solid var(--border-color);
}

.series-block:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

@media (min-width: 1024px) {
  .series-block {
    grid-template-columns: 1fr 1fr;
  }

  .series-block.reverse {
    direction: rtl;
  }

  .series-block.reverse > * {
    direction: ltr;
  }
}

.series-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 1rem;
}

.series-title-en {
  display: block;
  font-size: 0.6em;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  margin-top: 0.5rem;
  text-transform: uppercase;
}

.series-highlight {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--crimson-red);
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.series-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.detail-zoom {
  background: linear-gradient(135deg, #FFF9F0 0%, #FFF5E6 100%);
  padding: 1.5rem;
  border-radius: 8px;
  border-top: 2px solid var(--emperor-gold);
  margin-top: 2rem;
}

.detail-zoom h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 0.75rem;
}

.detail-zoom p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.visual-placeholder {
  width: 100%;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--crimson-red) 0%, #8B3333 100%);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 60px rgba(168, 62, 62, 0.3);
}

.visual-placeholder.has-image {
  background-size: cover;
  background-position: center;
  position: relative;
}

.visual-placeholder.has-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 55%, rgba(0,0,0,0.55) 100%);
}

.visual-placeholder.has-image .placeholder-text {
  position: relative;
  z-index: 1;
  align-self: flex-end;
  margin-bottom: 1.5rem;
}

.placeholder-text {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  color: var(--paper-white);
  letter-spacing: 0.2em;
  writing-mode: vertical-rl;
  text-orientation: upright;
}

/* Bespoke Section */
.service-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin: 3rem 0;
}

@media (min-width: 768px) {
  .service-features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-item {
  padding: 2rem;
  background: linear-gradient(135deg, #F5F5F5 0%, #EBEBEB 100%);
  border-radius: 8px;
  text-align: center;
  transition: transform var(--transition-medium) ease, box-shadow var(--transition-medium) ease;
}

.service-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.service-icon {
  color: var(--crimson-red);
  margin-bottom: 1rem;
}

.service-icon svg {
  width: 2.75rem;
  height: 2.75rem;
}

.service-item h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 1rem;
}

.service-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.atelier-section,
.certificate-section {
  margin-top: 4rem;
  padding: 2rem;
  background: linear-gradient(135deg, #FFF 0%, #F8F8F8 100%);
  border-top: 2px solid var(--crimson-red);
  border-radius: 4px;
}

.atelier-section h3,
.certificate-section h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink-black);
  margin-bottom: 1rem;
}

.atelier-section p,
.certificate-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.atelier-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

@media (min-width: 768px) {
  .atelier-info {
    grid-template-columns: repeat(3, 1fr);
  }
}

.info-item {
  padding: 1.5rem;
  background: white;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.info-item strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--crimson-red);
  margin-bottom: 0.5rem;
}

.info-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Footer */
.footer {
  background: var(--ink-black);
  color: var(--paper-white);
  padding: 4rem 0 2rem;
  margin-top: 6rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 2fr 3fr;
  }
}

.footer-brand h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--crimson-red);
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--paper-white);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-col a {
  transition: color var(--transition-fast) ease;
}

.footer-col a:hover {
  color: var(--crimson-red);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
  margin-bottom: 0.5rem;
}

.footer-credit a {
  color: var(--crimson-red);
  text-decoration: underline;
}

/* Scroll Reveal Animation - 1000ms 淡入 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
}

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

/* Responsive - Mobile First */
@media (max-width: 1023px) {
  :root {
    --section-padding: 4rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper-white);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium) ease;
  }

  .nav-menu.active {
    max-height: 400px;
  }

  .nav-link {
    padding: 1rem 2rem;
    width: 100%;
    display: block;
  }

  .nav-link::after {
    display: none;
  }

  .hero {
    height: 90vh;
  }

  .empty-block {
    padding: 6rem 0;
  }

  .empty-block-image {
    height: 60vh;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-item::before {
    left: -2rem;
  }
}

@media (max-width: 767px) {
  .hero-content {
    padding: 0 1.5rem;
  }

  .container {
    padding: 0 1.5rem;
  }

  .section-grid,
  .series-block {
    gap: 2rem;
  }

  .academic-credential,
  .material-innovation,
  .process-description {
    padding: 1.5rem;
  }

  .tech-features,
  .service-features {
    gap: 1.5rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Focus States */
a:focus,
button:focus {
  outline: 2px solid var(--crimson-red);
  outline-offset: 2px;
}

/* Cursor Pointer */
a,
button,
.nav-toggle,
.nav-link {
  cursor: pointer;
}