/* ─── Reset & 基礎 ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0a;
  --bg-2: #111111;
  --bg-3: #1a1a1a;
  --border: rgba(255,255,255,0.08);
  --white: #ffffff;
  --grey: rgba(255,255,255,0.45);
  --grey-2: rgba(255,255,255,0.2);
  --font-en: 'Inter', sans-serif;
  --font-zh: 'Noto Sans TC', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--white);
  font-family: var(--font-zh);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ─── Navigation ─── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

nav.scrolled { border-bottom-color: var(--border); }

.nav-logo {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--white);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--white); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--white);
  transition: all 0.3s;
}

.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.nav-mobile {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 99;
  background: var(--bg);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 40px;
}

.nav-mobile.open { display: flex; }

.nav-mobile a {
  font-family: var(--font-en);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--white);
  text-decoration: none;
  transition: opacity 0.2s;
}

.nav-mobile a:hover { opacity: 0.5; }

/* ─── Footer ─── */
footer {
  padding: 32px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

footer p {
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--grey-2);
  letter-spacing: 0.05em;
}

/* ─── 入場動畫 ─── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ─── 共用 Section ─── */
section { padding: 120px 48px; }

.section-index {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grey-2);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-en);
  font-size: clamp(36px, 5vw, 72px);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1;
  margin-bottom: 80px;
}

/* ══════════════════════════════════════
   INDEX PAGE
══════════════════════════════════════ */

/* Hero */
#hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 80px 48px 60px;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.hero-title {
  font-family: var(--font-en);
  font-size: clamp(72px, 12vw, 180px);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 0.9;
  color: var(--white);
}

.hero-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 48px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
  width: 100%;
}

.hero-desc {
  font-size: 13px;
  color: var(--grey);
  letter-spacing: 0.05em;
  text-align: center;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.3;
}

.scroll-hint span {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  writing-mode: vertical-rl;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: var(--white);
  animation: scrollDown 1.8s ease-in-out infinite;
}

@keyframes scrollDown {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* About */
#about { background: var(--bg); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text p {
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-text .highlight {
  font-size: 22px;
  font-weight: 400;
  color: var(--white);
  line-height: 1.6;
  margin-bottom: 32px;
}

.timeline { display: flex; flex-direction: column; }

.timeline-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.timeline-item:last-child { border-bottom: 1px solid var(--border); }

.timeline-year {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 500;
  color: var(--grey);
  padding-top: 2px;
}

.timeline-content h4 {
  font-size: 14px;
  font-weight: 500;
  color: var(--white);
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 13px;
  color: var(--grey);
  line-height: 1.7;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.timeline-tag {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--grey);
}

/* Services */
#services { background: var(--bg-2); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-left: 1px solid var(--border);
}

.service-col {
  padding: 48px 40px;
  border-right: 1px solid var(--border);
  border-top: 1px solid var(--border);
}

.service-en {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--grey-2);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.service-title {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 32px;
  line-height: 1.4;
}

.service-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-items li {
  font-size: 13px;
  color: var(--grey);
  padding-left: 16px;
  position: relative;
}

.service-items li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--grey-2);
}

/* Works */
#works { background: var(--bg); }

.works-filter {
  display: flex;
  margin-bottom: 60px;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  font-family: var(--font-zh);
  font-size: 13px;
  font-weight: 400;
  color: var(--grey);
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px 24px;
  position: relative;
  transition: color 0.2s;
  white-space: nowrap;
}

.filter-btn::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 1px;
  background: var(--white);
  transform: scaleX(0);
  transition: transform 0.2s;
}

.filter-btn.active { color: var(--white); }
.filter-btn.active::after { transform: scaleX(1); }
.filter-btn:hover { color: rgba(255,255,255,0.7); }

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
}

.work-card {
  background: var(--bg);
  overflow: hidden;
  cursor: pointer;
  display: block;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.3s;
}

.work-card.hidden { display: none; }

.work-thumb {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-3);
  position: relative;
  overflow: hidden;
}

.work-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--ph-a, #1a1a1a) 0%, var(--ph-b, #2a2a2a) 100%);
}

/* 若有圖片則顯示圖片 */
.work-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.work-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  transition: background 0.3s;
}

.work-card:hover .work-thumb-overlay { background: rgba(0,0,0,0.3); }

.work-info { padding: 20px 24px 24px; }

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.work-tag {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--grey-2);
}

.work-tag::before { content: '#'; }

.work-name {
  font-size: 15px;
  font-weight: 400;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 6px;
}

.work-client {
  font-size: 12px;
  color: var(--grey);
}

/* Contact */
#contact {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}

.contact-inner { max-width: 800px; }

.contact-cta {
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 300;
  line-height: 1.2;
  margin-bottom: 64px;
  color: var(--white);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.contact-label {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--grey-2);
  width: 80px;
  flex-shrink: 0;
  text-transform: uppercase;
}

.contact-value {
  font-family: var(--font-en);
  font-size: clamp(16px, 2.5vw, 28px);
  font-weight: 300;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: opacity 0.2s;
}

.contact-value:hover { opacity: 0.5; }

/* ══════════════════════════════════════
   WORKS DETAIL PAGE
══════════════════════════════════════ */

/* 返回按鈕 */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

.back-btn::before {
  content: '←';
  font-size: 14px;
}

.back-btn:hover { color: var(--white); }

/* 作品 Hero */
.work-hero {
  min-height: 70svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 120px 48px 64px;
  position: relative;
  overflow: hidden;
  background: var(--bg-3);
}

.work-hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--ph-a, #1a1a1a) 0%, var(--ph-b, #2a2a2a) 100%);
  z-index: 0;
}

.work-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.work-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,10,0.9) 0%, rgba(10,10,10,0.2) 100%);
  z-index: 1;
}

.work-hero-overlay img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  z-index: -1;
}

.work-hero-content {
  position: relative;
  z-index: 2;
}

.work-hero-category {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grey);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.work-hero-title {
  font-family: var(--font-en);
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--white);
  margin-bottom: 12px;
}

.work-hero-subtitle {
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 300;
  color: rgba(255,255,255,0.6);
  margin-bottom: 32px;
}

.work-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.work-hero-tag {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grey);
  padding: 5px 14px;
  border: 1px solid rgba(255,255,255,0.2);
}

.work-hero-tag::before { content: '#'; }

/* 作品資訊列 */
.work-meta {
  padding: 0 48px;
  border-bottom: 1px solid var(--border);
}

.work-meta-inner {
  display: flex;
  gap: 0;
  padding: 40px 0;
}

.work-meta-item {
  flex: 1;
  padding-right: 40px;
  border-right: 1px solid var(--border);
  margin-right: 40px;
}

.work-meta-item:last-child {
  border-right: none;
  margin-right: 0;
  padding-right: 0;
}

.work-meta-label {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--grey-2);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.work-meta-value {
  font-size: 14px;
  color: var(--white);
  font-weight: 400;
}

/* 作品描述 */
.work-body {
  padding: 80px 48px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 80px;
  align-items: start;
}

.work-body-label {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grey-2);
  text-transform: uppercase;
  padding-top: 4px;
}

.work-body-text {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  line-height: 1.9;
}

.work-body-empty {
  color: var(--grey-2);
  font-style: italic;
}

/* 圖片區塊 */
.work-images {
  padding: 0 48px 80px;
}

.work-images-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
}

.work-images-grid.single { grid-template-columns: 1fr; }
.work-images-grid.triple { grid-template-columns: repeat(3, 1fr); }

.work-img-item {
  aspect-ratio: 16/10;
  background: var(--bg-3);
  position: relative;
  overflow: hidden;
}

.work-img-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--ph-a, #1a1a1a) 0%, var(--ph-b, #2a2a2a) 100%);
}

.work-img-item img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 上下頁導覽 */
.work-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--border);
}

.work-nav-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 40px 48px;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
  border-right: 1px solid var(--border);
}

.work-nav-item:last-child { border-right: none; }
.work-nav-item:hover { background: var(--bg-2); }
.work-nav-item.next { align-items: flex-end; text-align: right; }

.work-nav-dir {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--grey-2);
  text-transform: uppercase;
}

.work-nav-name {
  font-size: 18px;
  font-weight: 300;
  color: var(--white);
}

.work-nav-client {
  font-size: 12px;
  color: var(--grey);
}

/* 오류 페이지 */
.error-page {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 24px;
  padding: 48px;
}

.error-page h1 {
  font-family: var(--font-en);
  font-size: 80px;
  font-weight: 300;
  color: var(--grey-2);
}

.error-page p { color: var(--grey); }

/* ══════════════════════════════════════
   RWD
══════════════════════════════════════ */
@media (max-width: 900px) {
  nav { padding: 18px 24px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  #hero { padding: 80px 24px 48px; }
  .hero-bottom { flex-direction: column; align-items: center; gap: 12px; }

  section { padding: 80px 24px; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }

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

  .works-filter { overflow-x: auto; }
  .filter-btn { padding: 12px 18px; }
  .works-grid { grid-template-columns: 1fr 1fr; }

  footer { padding: 24px; flex-direction: column; gap: 8px; }

  /* Works detail */
  .work-hero { padding: 100px 24px 48px; }
  .work-meta { padding: 0 24px; }
  .work-meta-inner { flex-direction: column; gap: 24px; }
  .work-meta-item { border-right: none; margin-right: 0; padding-right: 0; border-bottom: 1px solid var(--border); padding-bottom: 24px; }
  .work-meta-item:last-child { border-bottom: none; padding-bottom: 0; }
  .work-body { padding: 48px 24px; grid-template-columns: 1fr; gap: 24px; }
  .work-images { padding: 0 24px 48px; }
  .work-images-grid { grid-template-columns: 1fr; }
  .work-images-grid.triple { grid-template-columns: 1fr; }
  .work-nav-item { padding: 32px 24px; }
}

@media (max-width: 600px) {
  .works-grid { grid-template-columns: 1fr; }
  .work-nav { grid-template-columns: 1fr; }
  .work-nav-item { border-right: none; border-bottom: 1px solid var(--border); }
  .work-nav-item:last-child { border-bottom: none; }
  .work-nav-item.next { align-items: flex-start; text-align: left; }
}