/* ============================================================
   湛瀾科技 AZURITH — 紙感編輯排版 × 深海墨藍
   ============================================================ */
:root {
  --paper: #f4f0e6;
  --paper-dim: #ece6d8;
  --ink: #14333f;
  --ink-soft: #3d5a66;
  --deep: #0b2630;
  --deep-2: #123745;
  --copper: #c4682f;
  --copper-soft: #d98a52;
  --line: rgba(20, 51, 63, .22);
  --serif: "Noto Serif TC", serif;
  --sans: "Noto Sans TC", sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

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

html { scroll-behavior: smooth; }

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

::selection { background: var(--copper); color: #fff; }

/* ---------- 進場畫面 ---------- */
.intro {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--deep);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .7s ease, visibility .7s;
}
.intro.done { opacity: 0; visibility: hidden; }
.intro-inner { text-align: center; color: var(--paper); }
.intro-zh {
  display: block;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: .35em;
  margin-bottom: .8rem;
}
.intro-en {
  display: block;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .4em;
  opacity: .6;
  margin-bottom: 2rem;
}
.intro-bar {
  width: 180px;
  height: 1px;
  background: rgba(244, 240, 230, .2);
  margin: 0 auto;
  overflow: hidden;
}
.intro-bar span {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--copper-soft);
  transform: translateX(-100%);
  animation: introload 1.4s ease forwards;
}
@keyframes introload { to { transform: translateX(0); } }

/* ---------- 導覽列 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 2.5rem;
  padding: 1.1rem clamp(1.2rem, 4vw, 3.5rem);
  transition: background .4s, box-shadow .4s, padding .4s;
}
.nav.scrolled {
  background: rgba(244, 240, 230, .92);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--line);
  padding-top: .7rem;
  padding-bottom: .7rem;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
}
.logo-mark { color: var(--copper); display: flex; }
.logo-text {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .12em;
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-text small {
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .35em;
  font-weight: 400;
  color: var(--ink-soft);
}
.nav-links { display: flex; gap: 1.8rem; }
.nav-links a {
  text-decoration: none;
  color: var(--ink);
  font-size: .9rem;
  letter-spacing: .1em;
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1.5px;
  background: var(--copper);
  transition: width .3s;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  text-decoration: none;
  color: var(--paper);
  background: var(--ink);
  font-size: .85rem;
  letter-spacing: .15em;
  padding: .55rem 1.3rem;
  border-radius: 2px;
  transition: background .3s;
}
.nav-cta:hover { background: var(--copper); }
.nav-burger { display: none; }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--deep);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.6rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity .35s, visibility .35s;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a {
  color: var(--paper);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.4rem;
  letter-spacing: .3em;
}

/* ---------- 主視覺 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem clamp(1.2rem, 6vw, 6rem) 0;
}
#waveCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.hero-side {
  position: absolute;
  right: clamp(1rem, 4vw, 3.5rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
}
.vertical-text {
  writing-mode: vertical-rl;
  font-family: var(--serif);
  font-size: .82rem;
  letter-spacing: .45em;
  color: var(--ink-soft);
  border-right: 1px solid var(--line);
  padding-right: 1rem;
  max-height: 60vh;
}
.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero-kicker {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .42em;
  color: var(--copper);
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-bottom: 1.6rem;
}
.tick {
  width: 36px; height: 1.5px;
  background: var(--copper);
  display: inline-block;
}
.hero-title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(3rem, 9vw, 6.4rem);
  line-height: 1.18;
  letter-spacing: .06em;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title em {
  font-style: normal;
  color: var(--copper);
  position: relative;
}
.hero-title em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: .08em;
  height: .1em;
  background: var(--copper);
  opacity: .25;
}
.hero-sub {
  margin-top: 1.8rem;
  max-width: 480px;
  color: var(--ink-soft);
  font-size: 1.02rem;
}
.hero-actions { margin-top: 2.4rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  text-decoration: none;
  font-size: .92rem;
  letter-spacing: .18em;
  padding: .85rem 2rem;
  border-radius: 2px;
  transition: all .3s;
  display: inline-block;
}
.btn-solid {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}
.btn-solid:hover { background: var(--copper); border-color: var(--copper); }
.btn-ghost {
  border: 1px solid var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.hero-meta {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 5rem;
}
.meta-item {
  background: var(--paper);
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
}
.meta-num {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 500;
  color: var(--deep);
}
.meta-label {
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--ink-soft);
  margin-top: .3rem;
}
.scroll-hint {
  position: relative;
  z-index: 2;
  align-self: center;
  margin: 2.2rem 0 1.4rem;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: .78rem;
  letter-spacing: .5em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
}
.scroll-hint span {
  width: 1px; height: 44px;
  background: var(--ink-soft);
  display: block;
  animation: dip 2s ease-in-out infinite;
  transform-origin: top;
}
@keyframes dip {
  0%, 100% { transform: scaleY(.4); opacity: .4; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ---------- 區段標題 ---------- */
section { padding: clamp(4.5rem, 9vw, 8rem) clamp(1.2rem, 6vw, 6rem); }
.section-head {
  display: flex;
  align-items: baseline;
  gap: 1.4rem;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}
.section-no {
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--copper);
  letter-spacing: .2em;
}
.section-head h2 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: .14em;
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
}
.section-head h2 small {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .4em;
  font-weight: 400;
  color: var(--ink-soft);
}
.section-head.light h2, .section-head.light h2 small { color: var(--paper); }
.section-head.light h2 small { opacity: .6; }

/* ---------- 關於 ---------- */
.about { border-top: 1px solid var(--line); }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
}
.big-quote {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: .08em;
  margin-bottom: 1.8rem;
  color: var(--deep);
}
.about-statement p:not(.big-quote) {
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
  max-width: 50ch;
}
.about-values {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.value-card {
  background: var(--paper);
  padding: 1.8rem 1.6rem;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1.4rem;
  transition: background .3s;
}
.value-card:hover { background: var(--paper-dim); }
.value-index {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--copper);
  grid-row: span 2;
  line-height: 1.4;
}
.value-card h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  letter-spacing: .12em;
}
.value-card p { font-size: .9rem; color: var(--ink-soft); }

/* ---------- 核心技術 ---------- */
.tech { background: var(--paper-dim); border-top: 1px solid var(--line); }
.tech-list { display: flex; flex-direction: column; gap: clamp(3rem, 6vw, 5.5rem); }
.tech-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.tech-item.reverse { grid-template-columns: 1fr 280px; }
.tech-item.reverse .tech-visual { order: 2; }
.tech-visual {
  color: var(--deep);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  transition: transform .45s ease, box-shadow .45s ease;
}
.tech-item:hover .tech-visual {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px -20px rgba(11, 38, 48, .35);
}
.tech-visual svg { width: 100%; height: 100%; }
.tech-tag {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .4em;
  color: var(--copper);
}
.tech-text h3 {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  letter-spacing: .1em;
  margin: .5rem 0 1rem;
}
.tech-text > p { color: var(--ink-soft); max-width: 56ch; }
.tech-specs {
  list-style: none;
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.8rem;
}
.tech-specs li {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--deep);
  padding-left: 1rem;
  position: relative;
}
.tech-specs li::before {
  content: "";
  position: absolute;
  left: 0; top: .55em;
  width: 5px; height: 5px;
  background: var(--copper);
  border-radius: 50%;
}

/* ---------- 深潛軌跡（深色段落） ---------- */
.milestones {
  background: linear-gradient(180deg, var(--deep) 0%, var(--deep-2) 60%, var(--deep) 100%);
  color: var(--paper);
}
.depth-track {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding-left: clamp(2.5rem, 6vw, 4rem);
}
.depth-line {
  position: absolute;
  left: clamp(.6rem, 2vw, 1.2rem);
  top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(217, 138, 82, .9), rgba(244, 240, 230, .12));
}
.depth-stop {
  position: relative;
  padding: 0 0 clamp(2.4rem, 5vw, 3.6rem);
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.depth-stop.shown { opacity: 1; transform: none; }
.depth-stop::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(2.5rem, 6vw, 4rem) + clamp(.6rem, 2vw, 1.2rem) - 4px);
  top: .5em;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--copper-soft);
  box-shadow: 0 0 0 5px rgba(217, 138, 82, .15);
}
.depth-stop::after {
  content: attr(data-depth);
  position: absolute;
  right: 0; top: .2em;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .25em;
  color: rgba(244, 240, 230, .45);
}
.depth-year {
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .3em;
  color: var(--copper-soft);
}
.depth-stop h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: .18em;
  margin: .4rem 0 .6rem;
}
.depth-stop p {
  color: rgba(244, 240, 230, .72);
  max-width: 52ch;
  font-size: .95rem;
}

/* ---------- 觀測網絡 ---------- */
.stations { border-top: 1px solid var(--line); }
.stations-intro {
  color: var(--ink-soft);
  margin: -2rem 0 2.4rem;
  font-size: .95rem;
}
.stations-board {
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  font-family: var(--mono);
  font-size: .85rem;
}
.board-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr .8fr .8fr .9fr;
  gap: .5rem;
  padding: .9rem 1.4rem;
  border-bottom: 1px solid var(--line);
  align-items: center;
}
.board-row:last-child { border-bottom: none; }
.board-row:not(.board-head):hover { background: var(--paper-dim); }
.board-head {
  background: var(--deep);
  color: var(--paper);
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .2em;
}
.b-status {
  justify-self: start;
  font-size: .72rem;
  letter-spacing: .12em;
  padding: .15rem .6rem;
  border-radius: 2px;
}
.b-status.ok { color: #1e6e50; background: rgba(30, 110, 80, .12); }
.b-status.warn { color: var(--copper); background: rgba(196, 104, 47, .12); }
.b-status.ok::before {
  content: "●";
  margin-right: .4em;
  animation: blink 2.4s infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .25; } }

/* ---------- 深藍誌 ---------- */
.journal { background: var(--paper-dim); border-top: 1px solid var(--line); }
.journal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.journal-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1.8rem 1.6rem;
  display: flex;
  flex-direction: column;
  transition: transform .35s, box-shadow .35s;
}
.journal-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 36px -22px rgba(11, 38, 48, .4);
}
.journal-date {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .25em;
  color: var(--copper);
}
.journal-card h3 {
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.7;
  letter-spacing: .06em;
  margin: .8rem 0;
}
.journal-card p {
  font-size: .88rem;
  color: var(--ink-soft);
  flex: 1;
}
.journal-link {
  margin-top: 1.4rem;
  font-size: .82rem;
  letter-spacing: .2em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
  align-self: flex-start;
  padding-bottom: 2px;
  transition: color .3s;
}
.journal-link:hover { color: var(--copper); }

/* ---------- 聯絡 ---------- */
.contact {
  background: var(--deep);
  color: var(--paper);
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  max-width: 1080px;
  margin: 0 auto;
}
.contact-text h2 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: .12em;
  line-height: 1.5;
  margin-bottom: 1.4rem;
}
.contact-text > p { color: rgba(244, 240, 230, .7); max-width: 40ch; }
.contact-info { margin-top: 2.2rem; display: flex; flex-direction: column; gap: .7rem; }
.contact-info p { font-size: .92rem; color: rgba(244, 240, 230, .85); }
.contact-info span {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .3em;
  color: var(--copper-soft);
  margin-right: 1rem;
}
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; }
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  font-size: .82rem;
  letter-spacing: .2em;
  color: rgba(244, 240, 230, .75);
}
.contact-form input, .contact-form textarea {
  background: rgba(244, 240, 230, .06);
  border: 1px solid rgba(244, 240, 230, .25);
  border-radius: 2px;
  padding: .8rem 1rem;
  color: var(--paper);
  font-family: var(--sans);
  font-size: .95rem;
  resize: vertical;
  transition: border-color .3s, background .3s;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: var(--copper-soft);
  background: rgba(244, 240, 230, .1);
}
.contact-form .btn-solid {
  background: var(--copper);
  border: none;
  cursor: pointer;
  font-family: var(--sans);
  align-self: flex-start;
}
.contact-form .btn-solid:hover { background: var(--copper-soft); }
.form-done {
  display: none;
  font-size: .85rem;
  color: var(--copper-soft);
  letter-spacing: .1em;
}
.form-done.show { display: block; }

/* ---------- 頁尾 ---------- */
.footer {
  background: var(--deep);
  color: var(--paper);
  border-top: 1px solid rgba(244, 240, 230, .12);
  padding: 2.5rem clamp(1.2rem, 6vw, 6rem) 1.6rem;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(244, 240, 230, .12);
}
.footer-brand .logo-text { color: var(--paper); }
.footer-brand .logo-text small { color: rgba(244, 240, 230, .5); }
.footer-brand p {
  margin-top: .8rem;
  font-size: .85rem;
  letter-spacing: .25em;
  color: rgba(244, 240, 230, .6);
}
.footer-links { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.footer-links a {
  color: rgba(244, 240, 230, .75);
  text-decoration: none;
  font-size: .85rem;
  letter-spacing: .15em;
}
.footer-links a:hover { color: var(--copper-soft); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .6rem;
  padding-top: 1.4rem;
  font-size: .74rem;
  color: rgba(244, 240, 230, .45);
  letter-spacing: .12em;
}
.footer-coord { font-family: var(--mono); }

/* ---------- 進場動畫（reveal） ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.shown { opacity: 1; transform: none; }

/* ---------- RWD ---------- */
@media (max-width: 960px) {
  .nav-links, .nav-cta { display: none; }
  .nav-burger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
    padding: .4rem;
  }
  .nav-burger span {
    width: 24px; height: 2px;
    background: var(--ink);
    transition: transform .3s, opacity .3s;
  }
  .nav-burger.open span { background: var(--paper); }
  .nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-burger.open span:nth-child(2) { opacity: 0; }
  .nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero-side { display: none; }
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-inner { grid-template-columns: 1fr; }
  .tech-item, .tech-item.reverse { grid-template-columns: 1fr; }
  .tech-item.reverse .tech-visual { order: 0; }
  .tech-visual { max-width: 260px; }
  .journal-grid { grid-template-columns: 1fr; }
  .board-row { grid-template-columns: 1.2fr .9fr .6fr .6fr .8fr; font-size: .74rem; padding: .8rem .8rem; }
  .depth-stop::after { position: static; display: block; margin-top: .4rem; }
}