/* ===== 泰山職訓網頁設計 — 入口頁 ===== */

:root {
  --ink:        #0a0d13;   /* 中性深底，兩班共用 */
  --chrome-bg:  #070b1a;   /* 上下列底色 */
  --chrome-line: rgba(230, 238, 240, .11);
  --chrome-glow: transparent;
  --chrome-icon: #8aa3a8;
  --paper:      #e6eef0;
  --muted:      #8aa3a8;
  --front:      #3fc4b8;   /* logo 青 */
  --front-deep: #0e2f31;
  --back:       #8e7be8;   /* PHP 紫 */
  --back-deep:  #171432;
  --gold:       #fbc311;   /* logo 黃 */
  --seam:       7deg;
  --bar:        68px;
  --ribbon:     52px;
  --font-tc:    "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-tc);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* ---------- 頂部列 ---------- */

.topbar {
  position: relative;
  z-index: 5;
  flex: 0 0 auto;
  min-height: var(--bar);
  padding: 0 clamp(16px, 4vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--chrome-bg);
  border-bottom: 1px solid var(--chrome-line);
  box-shadow: 0 14px 52px -8px var(--chrome-glow);
  transition: border-color .45s ease, box-shadow .45s ease;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand img { display: block; }

.brand__name {
  margin: 0;
  font-weight: 400;
  font-size: clamp(15px, 2.2vw, 19px);
  letter-spacing: .06em;
  color: var(--muted);
}
.brand__name b { color: var(--paper); font-weight: 900; }

.facts {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.5vw, 28px);
  font-family: var(--font-tc);
  font-size: clamp(12px, 1.5vw, 14px);
  letter-spacing: .08em;
  color: var(--muted);
}
.facts li { display: flex; align-items: center; gap: 6px; }
.facts i { color: var(--chrome-icon); font-size: 1.1em; transition: color .45s ease; }
.facts__num {
  font-family: var(--font-mono);
  font-size: 1.5em;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  margin-right: 2px;
}

/* 滑入哪一班，上下列就換成該班的顏色 */
body[data-active="front"] {
  --chrome-line: rgba(63, 196, 184, .85);
  --chrome-glow: rgba(63, 196, 184, .45);
  --chrome-icon: var(--front);
}
body[data-active="back"] {
  --chrome-line: rgba(142, 123, 232, .85);
  --chrome-glow: rgba(142, 123, 232, .45);
  --chrome-icon: var(--back);
}

/* ---------- 雙分割主體 ---------- */

.split {
  position: relative;
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

.pane {
  position: relative;
  flex: 1 1 50%;
  display: flex;
  align-items: center;
  min-width: 0;
  padding: clamp(28px, 5vh, 64px) clamp(24px, 5vw, 72px);
  transition: flex-grow .5s cubic-bezier(.22, 1, .36, 1);
}

/* 斜切底色：後宣告的 pane 疊在前者之上，形成一道接縫 */
.pane::before {
  content: "";
  position: absolute;
  inset: 0 -24vh;
  z-index: -2;
  transform: skewX(calc(var(--seam) * -1));
  background: var(--pane-bg);
  transition: filter .5s ease, box-shadow .45s ease;
}

.pane--front {
  --pane-bg: radial-gradient(120% 90% at 15% 25%, #12403f 0%, var(--front-deep) 45%, var(--ink) 100%);
  --accent: var(--front);
  justify-content: flex-end;
  padding-right: clamp(28px, 8vw, 120px);
}
.pane--back {
  --pane-bg: radial-gradient(120% 90% at 85% 25%, #2f2560 0%, var(--back-deep) 45%, var(--ink) 100%);
  --accent: var(--back);
  padding-left: clamp(28px, 8vw, 120px);
}
.pane--back::before {
  --seam-front: .2;
  --seam-back: .2;
  inset: 0 -24vh 0 0;
  border-left: 2px solid var(--back);
  box-shadow:
    -2px 0 0 0 rgba(63, 196, 184, .9),
    -4px 0 64px 2px rgba(63, 196, 184, var(--seam-front)),
    inset 4px 0 64px -8px rgba(142, 123, 232, var(--seam-back));
}
body[data-active="front"] .pane--back::before { --seam-front: .62; }
body[data-active="back"]  .pane--back::before { --seam-back: .62; }

.pane__body {
  position: relative;
  width: min(430px, 100%);
}

/* 背景浮水印圖示 */
.pane__mark {
  position: absolute;
  z-index: -1;
  font-size: clamp(180px, 22vw, 340px);
  line-height: 1;
  color: var(--accent);
  opacity: .07;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  transition: opacity .5s ease, transform .5s ease;
}
.pane--front .pane__mark { left: 4%; }
.pane--back  .pane__mark { right: 4%; }

.pane__file {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--accent);
  margin: 0 0 14px;
}
.pane__file::before { content: "// "; opacity: .55; }

.pane__title {
  font-size: clamp(30px, 4.4vw, 48px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: .01em;
  margin: 0 0 14px;
}

.pane__line {
  max-width: 30ch;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--muted);
  margin: 0 0 26px;
}

/* ---------- 技術棧圖示 ---------- */

.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}
.stack li {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid rgba(230, 238, 240, .14);
  border-radius: 999px;
  background: rgba(7, 23, 27, .45);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper);
  opacity: .9;
  transition: border-color .35s ease, transform .25s ease, opacity .35s ease;
}
.stack li:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.stack i { font-size: 17px; color: var(--accent); }

/* ---------- 進入按鈕 ---------- */

.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1.5px solid var(--accent);
  border-radius: 3px;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: .05em;
  color: var(--accent);
  background: transparent;
  transition: background-color .3s ease, color .3s ease, gap .3s ease, box-shadow .4s ease;
}
.cta i { font-size: 13px; }

.pane:hover .cta,
.pane:focus-visible .cta {
  background: var(--accent);
  color: var(--ink);
  gap: 16px;
  box-shadow: 0 0 38px -6px var(--accent);
}

.pane:hover::before,
.pane:focus-visible::before {
  filter: brightness(1.45) saturate(1.15);
}

.pane:hover .pane__mark,
.pane:focus-visible .pane__mark {
  opacity: .2;
  transform: translateY(-50%) scale(1.06);
}

.pane:hover .stack li,
.pane:focus-visible .stack li {
  border-color: color-mix(in srgb, var(--accent) 42%, transparent);
  opacity: 1;
}

/* 展開：滑入的一側變寬，另一側退讓 */
.split:hover .pane          { flex-grow: .82; }
.split:hover .pane:hover,
.split .pane:focus-visible  { flex-grow: 1.3; }

/* ---------- 底部標語 ---------- */

.ribbon {
  position: relative;
  z-index: 5;
  flex: 0 0 var(--ribbon);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--chrome-bg);
  border-top: 1px solid var(--chrome-line);
  box-shadow: 0 -14px 52px -8px var(--chrome-glow);
  transition: border-color .45s ease, box-shadow .45s ease;
}
.ribbon__icon { color: var(--chrome-icon); font-size: 14px; transition: color .45s ease; }
.ribbon__text {
  margin: 0;
  font-size: clamp(13px, 1.7vw, 15px);
  letter-spacing: .12em;
  color: var(--muted);
  transition: opacity .45s ease, transform .45s ease;
}
.ribbon__text.is-out { opacity: 0; transform: translateY(6px); }

/* ---------- 載入時的一次接縫掃描 ---------- */

.sweep {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  background: var(--chrome-bg);
  /* 接縫在半高處的水平位移：tan(7deg) x 50vh */
  --sweep-x: 6.14vh;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  animation: sweep-out 1s cubic-bezier(.76, 0, .24, 1) forwards;
}

/* 沿著接縫的方向分開，不是從垂直中線 */
@keyframes sweep-out {
  to {
    clip-path: polygon(
      calc(50% + var(--sweep-x)) 0,
      calc(50% + var(--sweep-x)) 0,
      calc(50% - var(--sweep-x)) 100%,
      calc(50% - var(--sweep-x)) 100%);
  }
}

/* 直向堆疊時接縫是水平的，改成上下分開 */
@keyframes sweep-out-h {
  to { clip-path: polygon(0 50%, 100% 50%, 100% 50%, 0 50%); }
}

/* ---------- 窄螢幕：改為上下堆疊、取消斜切 ---------- */

@media (max-width: 991.98px) and (orientation: portrait) {
  :root { --seam: 0deg; --bar: 56px; --ribbon: 44px; }
  .sweep { animation-name: sweep-out-h; }
  .split { flex-direction: column; }
  .pane {
    flex: 1 1 50%;
    justify-content: flex-start;
    padding: clamp(14px, 2.4vh, 28px) clamp(20px, 6vw, 40px);
  }
  .pane--front, .pane--back {
    padding-left: clamp(20px, 6vw, 40px);
    padding-right: clamp(20px, 6vw, 40px);
  }
  .pane::before { inset: 0; }
  .pane--back::before { inset: 0; border-left: 0; border-top: 2px solid var(--back); }
  .pane__body { width: 100%; }
  .pane__mark { font-size: clamp(160px, 42vw, 260px); opacity: .06; }
  .pane--front .pane__mark { left: auto; right: 2%; }
  .pane--back .pane__mark { left: auto; right: 2%; }
  .pane__file { font-size: 12px; margin-bottom: clamp(4px, 1vh, 10px); }
  .pane__title { font-size: clamp(23px, 3.4vh, 30px); margin-bottom: clamp(4px, 1vh, 10px); }
  .pane__line { font-size: 13px; line-height: 1.7; max-width: 34ch; margin-bottom: clamp(8px, 1.8vh, 18px); }
  .stack { gap: 6px; margin-bottom: clamp(10px, 2vh, 20px); }
  .stack li { padding: 5px 10px; font-size: 11px; gap: 6px; }
  .stack i { font-size: 15px; }
  .cta { padding: 9px 20px; font-size: 14px; }
  .split:hover .pane,
  .split:hover .pane:hover,
  .split .pane:focus-visible { flex-grow: 1; }
}

@media (max-width: 575.98px) and (orientation: portrait) {
  .topbar { padding: 0 16px; gap: 8px; }
  .brand { gap: 8px; }
  .brand img { width: 32px; height: 32px; }
  .brand__name { font-size: 14px; letter-spacing: .02em; }
  .facts { gap: 10px; font-size: 10px; }
  .facts li:nth-child(2) { display: none; }
  .facts__num { font-size: 1.5em; }
}

/* ---------- 矮視窗（橫向手機、小筆電）：等比壓縮，維持不捲動 ---------- */

@media (max-height: 620px) {
  :root { --bar: 48px; --ribbon: 36px; }
  .brand img { width: 32px; height: 32px; }
  .brand__name { font-size: 15px; }
  .pane { padding-top: 10px; padding-bottom: 10px; }
  .pane--front { padding-right: clamp(20px, 5vw, 64px); }
  .pane--back { padding-left: clamp(20px, 5vw, 64px); }
  .pane__mark { font-size: clamp(140px, 60vh, 300px); }
  .pane__file { font-size: 11px; margin-bottom: 6px; }
  .pane__title { font-size: clamp(20px, 5.4vh, 34px); margin-bottom: 6px; }
  .pane__line { display: none; }
  .stack { gap: 5px; margin-bottom: 12px; }
  .stack li { padding: 4px 9px; font-size: 10.5px; gap: 5px; }
  .stack i { font-size: 14px; }
  .cta { padding: 8px 18px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}