/* ==========================================================
   光恆工作室 — 一頁式形象網站
   設計概念：「恆久之光」— 暖紙白 × 墨色 × 琥珀金的編輯風版面
   區塊化結構，預留 WordPress 轉換
   ========================================================== */

:root {
  --paper: #FAF6EF;
  --paper-deep: #F3ECDF;
  --ink: #211D16;
  --ink-soft: #5C554A;
  --gold: #B9861C;
  --gold-bright: #E4B44A;
  --terra: #C45B33;
  --line: rgba(33, 29, 22, .14);
  --font-display: "Fraunces", "Noto Serif TC", serif;
  --font-body: "Noto Sans TC", sans-serif;
  --ease: cubic-bezier(.22, .8, .3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  font-weight: 400;
  overflow-x: hidden;
}
/* 紙感顆粒疊層 */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 9000;
  opacity: .045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }
.container { width: min(1160px, 92vw); margin-inline: auto; }

::selection { background: var(--gold-bright); color: var(--ink); }

/* ---------- 按鈕 ---------- */
.btn {
  display: inline-block;
  padding: .8em 2em;
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .12em;
  border: 1px solid var(--ink);
  transition: all .35s var(--ease);
}
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--gold); border-color: var(--gold); transform: translateY(-2px); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); transform: translateY(-2px); }
.btn-lg { padding: 1em 2.6em; font-size: 1.05rem; }

/* ---------- header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .4s, box-shadow .4s;
}
.site-header.is-scrolled {
  background: rgba(250, 246, 239, .92);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-block: 18px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  background: var(--ink); color: var(--gold-bright);
  font-family: var(--font-display); font-weight: 600; font-size: 1.3rem;
  border-radius: 4px;
}
.logo-zh { display: block; font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; letter-spacing: .18em; }
.logo-en { display: block; font-size: .58rem; letter-spacing: .34em; color: var(--ink-soft); }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: .92rem; letter-spacing: .14em; }
.site-nav a { position: relative; padding-block: 4px; }
.site-nav a:not(.nav-cta)::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1.5px; background: var(--gold);
  transform: scaleX(0); transform-origin: right;
  transition: transform .35s var(--ease);
}
.site-nav a:not(.nav-cta):hover::after,
.site-nav a.is-active::after { transform: scaleX(1); transform-origin: left; }
.nav-cta { border: 1px solid var(--ink); padding: .45em 1.3em; transition: all .3s; }
.nav-cta:hover { background: var(--ink); color: var(--paper); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; transition: .3s; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex; align-items: center;
  padding-block: 140px 80px;
  overflow: hidden;
}
.hero-glow {
  position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(ellipse 60% 50% at 78% 18%, rgba(228, 180, 74, .35), transparent 65%),
    radial-gradient(ellipse 50% 45% at 12% 85%, rgba(196, 91, 51, .12), transparent 60%),
    linear-gradient(var(--paper), var(--paper));
}
.hero-bigword {
  position: absolute; z-index: -1;
  right: -.06em; top: .1em;
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(200px, 34vw, 460px);
  line-height: .95; letter-spacing: -.02em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(185, 134, 28, .22);
  user-select: none; white-space: nowrap;
}
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero-eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-size: .82rem; letter-spacing: .26em; color: var(--ink-soft);
}
.hero-eyebrow .tick { width: 44px; height: 1.5px; background: var(--gold); }
.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 6.2vw, 4.6rem);
  line-height: 1.28;
  letter-spacing: .04em;
  margin-block: .5em .6em;
}
.hero-title span { display: block; }
.hero-title em {
  font-style: normal; position: relative; color: var(--gold);
}
.hero-title em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .06em;
  height: .12em; background: var(--gold-bright); opacity: .4; z-index: -1;
}
.hero-sub { color: var(--ink-soft); font-size: 1.05rem; margin-bottom: 2em; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; list-style: none; margin-top: 40px; }
.hero-tags li {
  font-size: .8rem; letter-spacing: .16em;
  padding: .4em 1.1em;
  border: 1px solid var(--line); border-radius: 100px;
  color: var(--ink-soft); background: rgba(255, 255, 255, .5);
}

.hero-visual { position: relative; }
.hero-photo {
  position: relative;
  aspect-ratio: 4 / 3;
  box-shadow: 0 24px 60px -18px rgba(33, 29, 22, .35);
  transform: rotate(1.5deg);
  background: var(--paper-deep);
}
.hero-photo figcaption {
  position: absolute; left: 14px; bottom: 14px; z-index: 3;
  background: rgba(33, 29, 22, .85); color: var(--paper);
  font-size: .75rem; letter-spacing: .18em;
  padding: .5em 1.1em;
}
.hero-photo figcaption span:first-child { color: var(--gold-bright); margin-right: .8em; font-family: var(--font-display); }

/* hero 輪播（前景 .hero-carousel 與後方墊圖 #heroCarouselBack 共用） */
.hero-slide {
  position: absolute; inset: 0; z-index: 1;
  opacity: 0; transition: opacity .9s var(--ease);
}
.hero-slide.is-active { opacity: 1; z-index: 2; }
.hero-dots {
  position: absolute; right: 14px; bottom: 18px; z-index: 3;
  display: flex; gap: 8px;
}
.hero-dots button {
  width: 9px; height: 9px; padding: 0;
  border-radius: 50%; border: 1px solid var(--paper);
  background: transparent; cursor: pointer;
  transition: background .3s, transform .3s;
}
.hero-dots button.is-active { background: var(--gold-bright); border-color: var(--gold-bright); transform: scale(1.25); }
.hero-photo--back {
  position: absolute; z-index: -1;
  width: 55%; aspect-ratio: 3 / 4;
  left: -14%; bottom: -14%;
  transform: rotate(-4deg);
  opacity: .95;
}
.hero-vertical {
  position: absolute; top: -8px; right: -44px;
  writing-mode: vertical-rl;
  font-family: var(--font-display); font-size: .8rem; letter-spacing: .5em;
  color: var(--gold);
}
.hero-scroll {
  position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-size: .62rem; letter-spacing: .4em; color: var(--ink-soft);
}
.hero-scroll-line { width: 1px; height: 42px; background: var(--ink-soft); position: relative; overflow: hidden; }
.hero-scroll-line::after {
  content: ""; position: absolute; inset: 0; background: var(--gold);
  animation: scrollhint 2s var(--ease) infinite;
}
@keyframes scrollhint { 0% { transform: translateY(-100%); } 60%, 100% { transform: translateY(100%); } }

/* ---------- 區塊共用 ---------- */
/* scroll-margin：錨點跳轉時在固定 header 下方多留空間，避免區塊標題貼著選單 */
.section { padding-block: 110px; position: relative; scroll-margin-top: 56px; }
.section-head { position: relative; margin-bottom: 60px; }
.section-no {
  position: absolute; left: 0; top: -.5em;
  font-family: var(--font-display); font-weight: 300;
  font-size: 5rem; color: transparent;
  -webkit-text-stroke: 1px rgba(185, 134, 28, .35);
  line-height: 1;
}
.section-en { margin-left: 92px; font-size: .74rem; letter-spacing: .42em; color: var(--gold); }
.section-title {
  margin-left: 92px;
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  letter-spacing: .1em;
}

/* ---------- about ---------- */
.about { background: linear-gradient(var(--paper), var(--paper-deep) 130%); }
.about-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 64px; align-items: start; }
.about-lead {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.5rem; letter-spacing: .06em;
  margin-bottom: .9em;
}
.about-lead::first-letter { color: var(--gold); }
.about-text > p:not(.about-lead) { color: var(--ink-soft); max-width: 34em; }
.about-facts { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; }
.about-facts li { border-top: 2px solid var(--ink); padding-top: 14px; }
.about-facts strong { display: block; font-family: var(--font-display); font-size: 1.1rem; letter-spacing: .08em; }
.about-facts span { font-size: .82rem; color: var(--ink-soft); }

/* 名片卡 */
.biz-card {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 22px 44px -20px rgba(33, 29, 22, .28);
  padding: 34px 32px;
  transform: rotate(1deg);
  transition: transform .4s var(--ease), box-shadow .4s;
}
.biz-card:hover { transform: rotate(0) translateY(-4px); box-shadow: 0 30px 56px -20px rgba(33, 29, 22, .34); }
.biz-card-top { display: flex; gap: 14px; align-items: center; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.biz-mark {
  display: grid; place-items: center;
  width: 52px; height: 52px; border-radius: 4px;
  background: var(--ink); color: var(--gold-bright);
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 600;
}
.biz-name { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; letter-spacing: .2em; }
.biz-en { font-size: .62rem; letter-spacing: .3em; color: var(--ink-soft); }
.biz-role { margin-block: 16px 20px; font-size: .85rem; letter-spacing: .2em; color: var(--gold); }
.biz-rows { list-style: none; display: grid; gap: 12px; font-size: .92rem; }
.biz-rows li { display: flex; gap: 16px; align-items: baseline; }
.biz-rows span {
  flex: 0 0 52px;
  font-size: .64rem; letter-spacing: .2em; color: var(--ink-soft);
  font-family: var(--font-display);
}
.biz-rows a { border-bottom: 1px dashed transparent; transition: .3s; }
.biz-rows a:hover { color: var(--gold); border-bottom-color: var(--gold); }

/* ---------- services ---------- */
.service-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line); border-left: 1px solid var(--line);
}
.service-item {
  padding: 40px 34px 46px;
  border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  position: relative; overflow: hidden;
  transition: background .4s;
}
.service-item::before {
  content: ""; position: absolute; left: 0; top: 0;
  width: 100%; height: 3px; background: var(--gold);
  transform: scaleX(0); transform-origin: left;
  transition: transform .45s var(--ease);
}
.service-item:hover { background: rgba(255, 255, 255, .6); }
.service-item:hover::before { transform: scaleX(1); }
.service-item h3 { font-family: var(--font-display); font-size: 1.25rem; letter-spacing: .12em; margin-bottom: .7em; font-weight: 700; }
.service-item h3 i { font-style: normal; }
.service-item p { font-size: .9rem; color: var(--ink-soft); }

/* ---------- works ---------- */
.works { background: var(--paper-deep); }
.work-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 44px; }
.filter-btn {
  font-family: var(--font-body); font-size: .88rem; letter-spacing: .14em;
  padding: .5em 1.5em;
  background: none; border: 1px solid var(--line); border-radius: 100px;
  color: var(--ink-soft); cursor: pointer;
  transition: all .3s var(--ease);
}
.filter-btn:hover { border-color: var(--ink); color: var(--ink); }
.filter-btn.is-active { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.work-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.work-card { cursor: zoom-in; }
.work-card.is-hidden { display: none; }
.work-media {
  overflow: hidden; position: relative;
  background: #fff;
  box-shadow: 0 16px 36px -18px rgba(33, 29, 22, .3);
}
.ratio-169 { aspect-ratio: 16 / 9; }
.ratio-32 { aspect-ratio: 3 / 2; }
.work-media img { transition: transform .8s var(--ease); }
.work-card:hover .work-media img { transform: scale(1.05); }
.work-media::after {
  content: "VIEW"; position: absolute; inset: 0;
  display: grid; place-items: center;
  background: rgba(33, 29, 22, .35);
  color: var(--paper); font-family: var(--font-display);
  font-size: .8rem; letter-spacing: .5em; text-indent: .5em;
  opacity: 0; transition: opacity .4s;
}
.work-card:hover .work-media::after { opacity: 1; }
a.work-card { display: block; cursor: pointer; }
a.work-card .work-media::after { content: "OPEN ↗"; }
.work-meta { padding-top: 18px; }
.work-cat { font-size: .68rem; letter-spacing: .26em; color: var(--gold); }
.work-meta h3 { font-family: var(--font-display); font-size: 1.12rem; font-weight: 700; letter-spacing: .06em; margin-block: .3em .2em; }
.work-meta p { font-size: .82rem; color: var(--ink-soft); }

/* ---------- pricing ---------- */
.price-table { border-top: 2px solid var(--ink); }
.price-row {
  display: flex; align-items: baseline; gap: 18px;
  padding: 22px 8px;
  border-bottom: 1px solid var(--line);
  transition: background .3s, padding-left .3s;
}
.price-row:hover { background: rgba(228, 180, 74, .08); padding-left: 18px; }
.price-name { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; letter-spacing: .1em; }
.price-unit { font-size: .78rem; color: var(--ink-soft); }
.price-row::after { content: ""; flex: 1; border-bottom: 1px dashed var(--line); transform: translateY(-4px); }
.price-range {
  font-family: var(--font-display); font-weight: 500;
  font-size: 1.05rem; letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}
.price-note { margin-top: 28px; font-size: .9rem; color: var(--ink-soft); }
.price-note a { color: var(--gold); border-bottom: 1px solid currentColor; }

/* ---------- contact ---------- */
.contact { background: var(--ink); color: var(--paper); overflow: hidden; }
.contact .section-title { color: var(--paper); }
.contact .section-no { -webkit-text-stroke-color: rgba(228, 180, 74, .4); }
.contact-bigword {
  position: absolute; right: -5%; bottom: -22%;
  font-family: var(--font-display); font-weight: 900;
  font-size: 30rem; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(250, 246, 239, .08);
  user-select: none; pointer-events: none;
}
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: start; }
.contact-slogan {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.35; letter-spacing: .06em;
  margin-bottom: .5em;
}
.contact-lead > p:not(.contact-slogan) { color: rgba(250, 246, 239, .68); max-width: 30em; margin-bottom: 2.2em; }
.contact .btn-solid { background: var(--gold-bright); border-color: var(--gold-bright); color: var(--ink); font-weight: 700; }
.contact .btn-solid:hover { background: var(--paper); border-color: var(--paper); }
.contact-list { list-style: none; display: grid; gap: 0; }
.contact-list li {
  display: flex; align-items: baseline; gap: 24px;
  padding-block: 20px;
  border-bottom: 1px solid rgba(250, 246, 239, .16);
}
.contact-list li:first-child { border-top: 2px solid var(--gold-bright); }
.contact-label {
  flex: 0 0 64px;
  font-size: .74rem; letter-spacing: .3em; color: var(--gold-bright);
}
.contact-list a { font-size: 1.05rem; transition: color .3s; }
.contact-list a:hover { color: var(--gold-bright); }
.contact-list em { display: block; font-style: normal; font-size: .8rem; color: rgba(250, 246, 239, .5); }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: rgba(250, 246, 239, .55); border-top: 1px solid rgba(250, 246, 239, .12); }
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding-block: 26px; font-size: .8rem; letter-spacing: .12em;
}
.footer-slogan { font-family: var(--font-display); }

/* ---------- lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(23, 20, 15, .93);
  display: none; place-items: center;
  padding: 5vmin;
}
.lightbox.is-open { display: grid; }
.lightbox figure { max-width: min(1100px, 92vw); }
.lightbox img {
  width: auto; max-width: 100%; max-height: 80vh;
  object-fit: contain;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .6);
}
.lightbox figcaption { color: var(--paper); text-align: center; margin-top: 16px; letter-spacing: .2em; font-size: .88rem; }
.lightbox-close {
  position: absolute; top: 22px; right: 30px;
  background: none; border: 0; color: var(--paper);
  font-size: 2.4rem; line-height: 1; cursor: pointer;
  transition: transform .3s, color .3s;
}
.lightbox-close:hover { color: var(--gold-bright); transform: rotate(90deg); }

/* ---------- 捲動進場 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
.d1 { transition-delay: .1s; } .d2 { transition-delay: .2s; }
.d3 { transition-delay: .3s; } .d4 { transition-delay: .4s; } .d5 { transition-delay: .5s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- RWD ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 64px; }
  .hero-bigword { font-size: 44vw; opacity: .7; }
  .hero-visual { max-width: 520px; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .work-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-bigword { font-size: 18rem; }
}
@media (max-width: 640px) {
  .section { padding-block: 76px; }
  .site-nav {
    position: fixed; inset: 0; z-index: -1;
    flex-direction: column; justify-content: center;
    background: var(--paper);
    font-size: 1.3rem; gap: 34px;
    opacity: 0; pointer-events: none;
    transition: opacity .35s;
  }
  .site-nav.is-open { opacity: 1; pointer-events: auto; z-index: 99; }
  .nav-toggle { display: block; position: relative; z-index: 100; }
  .nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero { padding-top: 110px; }
  .hero-vertical { right: -20px; }
  .section-no { font-size: 3.4rem; }
  .section-en, .section-title { margin-left: 64px; }
  .service-grid, .work-grid { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; gap: 16px; }
  .price-row { flex-wrap: wrap; }
  .price-row::after { display: none; }
  .price-range { flex-basis: 100%; color: var(--gold); }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}