/* 曙光教育 v4 — Design Tokens
 * 深夜圖書館：墨藍＋暖紙＋黃銅
 */
:root {
  --ink-950: oklch(0.16 0.03 260);
  --ink-900: oklch(0.20 0.04 260);
  --ink-800: oklch(0.26 0.05 260);
  --paper-50: oklch(0.96 0.02 90);
  --paper-200: oklch(0.88 0.03 90);
  --paper-400: oklch(0.72 0.03 90);
  --brass-300: oklch(0.82 0.12 85);
  --brass-400: oklch(0.74 0.14 80);
  --brass-600: oklch(0.60 0.12 80);
  --teal-400: oklch(0.68 0.10 200);
  --signal-green: oklch(0.72 0.14 150);
  --signal-red: oklch(0.62 0.18 25);

  --font-display: "Noto Serif TC", serif;
  --font-body: "Noto Sans TC", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  background: var(--ink-950);
  color: var(--paper-50);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

/* 紙質噪點 */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .035; z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* 時段背景 */
.time-bg {
  position: fixed; inset: 0; z-index: -1;
  background-size: cover; background-position: center;
  opacity: 0.15; transition: opacity 1s var(--ease-out);
}

/* 頂欄 */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 24px;
  border-bottom: 1px solid oklch(0.60 0.12 80 / 0.2);
  position: sticky; top: 0; z-index: 10;
  background: oklch(0.16 0.03 260 / 0.92);
  backdrop-filter: blur(8px);
}
.brand {
  font-family: var(--font-display); font-weight: 900; font-size: 17px;
  text-decoration: none; color: var(--paper-50);
}
.brand span { color: var(--brass-400); }
.nav { display: flex; gap: 2px; }
.nav a {
  color: var(--paper-400); text-decoration: none; font-size: 13px;
  padding: 8px 13px; border-radius: 2px; transition: all 120ms var(--ease-out);
}
.nav a:hover { color: var(--paper-50); background: oklch(1 0 0 / 0.05); }
.nav a.active { color: var(--brass-300); background: oklch(0.74 0.14 80 / 0.1); }
.user-chip { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--paper-400); }
.user-chip .pts { font-family: var(--font-mono); color: var(--brass-300); font-weight: 700; }

/* 主體 */
.main { max-width: 1080px; margin: 0 auto; padding: 24px; position: relative; z-index: 1; }
.page-head { margin-bottom: 20px; }
.page-head .en {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .2em; text-transform: uppercase; color: var(--brass-400);
}
.page-head h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 24px; margin-top: 4px;
}

/* 卡片 */
.card {
  background: var(--ink-900);
  border: 1px solid oklch(0.60 0.12 80 / 0.22);
  border-top: 2px solid var(--brass-400);
  border-radius: 3px; padding: 18px;
}
.card h2 {
  font-family: var(--font-display); font-size: 16px; font-weight: 700;
  margin-bottom: 12px;
}

/* 網格 */
.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 12px; }
.span3 { grid-column: span 3; } .span4 { grid-column: span 4; }
.span6 { grid-column: span 6; } .span8 { grid-column: span 8; }
.span12 { grid-column: span 12; }

/* 數字 */
.num { font-family: var(--font-mono); font-weight: 700; font-size: 28px; color: var(--brass-300); }
.num-sm { font-family: var(--font-mono); font-size: 14px; color: var(--brass-300); }
.label { font-size: 12px; color: var(--paper-400); }

/* 進度條 */
.bar { height: 5px; background: oklch(1 0 0 / 0.08); border-radius: 2px; overflow: hidden; margin: 8px 0; }
.bar > div { height: 100%; background: var(--brass-400); transition: width 300ms var(--ease-out); }

/* 按鈕 */
.btn {
  display: inline-block; padding: 9px 20px; font-size: 14px; font-weight: 700;
  border-radius: 2px; border: 1px solid transparent; cursor: pointer;
  font-family: var(--font-body); text-decoration: none;
  transition: all 120ms var(--ease-out);
}
.btn-primary { background: var(--brass-400); color: var(--ink-950); }
.btn-primary:hover { background: var(--brass-300); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--paper-400); border-color: oklch(0.60 0.12 80 / 0.35); }
.btn-ghost:hover { color: var(--brass-300); border-color: var(--brass-400); }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .15em;
  text-transform: uppercase; color: var(--brass-400); text-align: left;
  padding: 10px 12px; border-bottom: 1px solid oklch(0.60 0.12 80 / 0.3);
}
td { padding: 10px 12px; border-bottom: 1px solid oklch(1 0 0 / 0.05); }
td.n { font-family: var(--font-mono); text-align: right; color: var(--brass-300); }

/* 印章徽章 */
.seal {
  width: 56px; height: 56px; border-radius: 50%;
  border: 2px solid var(--brass-400);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 900; font-size: 18px;
  color: var(--brass-300); background: oklch(0.74 0.14 80 / 0.07);
  margin-right: 8px; margin-bottom: 8px;
}

/* 表單 */
.input, .textarea, .select {
  width: 100%; padding: 10px 14px; font-size: 14px;
  font-family: var(--font-body);
  background: var(--ink-800); color: var(--paper-50);
  border: 1px solid oklch(0.60 0.12 80 / 0.25); border-radius: 2px;
}
.input:focus, .textarea:focus, .select:focus {
  outline: none; border-color: var(--brass-400);
}
.textarea { min-height: 120px; resize: vertical; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--paper-400); margin-bottom: 6px; }

/* 狀態 */
.state-empty, .state-error, .state-loading {
  text-align: center; padding: 48px 24px; color: var(--paper-400);
}
.state-empty img { max-width: 200px; opacity: .6; margin-bottom: 16px; border-radius: 4px; }
.skeleton {
  background: linear-gradient(90deg, oklch(1 0 0 / 0.04) 25%, oklch(1 0 0 / 0.08) 50%, oklch(1 0 0 / 0.04) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite;
  border-radius: 3px; min-height: 20px;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* 首次引導 */
.onboarding {
  position: fixed; inset: 0; background: oklch(0 0 0 / 0.7);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.onboarding .box {
  background: var(--ink-900); border: 1px solid var(--brass-600);
  border-top: 2px solid var(--brass-400); border-radius: 4px;
  padding: 32px; max-width: 440px; margin: 24px;
}
.onboarding h2 { font-family: var(--font-display); font-size: 20px; margin-bottom: 12px; }
.onboarding ol { margin: 0 0 20px 20px; color: var(--paper-400); font-size: 14px; }
.onboarding ol li { margin-bottom: 8px; }

/* Toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink-800); border: 1px solid var(--brass-600);
  color: var(--paper-50); padding: 12px 24px; border-radius: 3px;
  font-size: 14px; z-index: 100; opacity: 0; transition: opacity 200ms;
}
.toast.show { opacity: 1; }

/* RWD */
@media (max-width: 768px) {
  .span3, .span4, .span6, .span8 { grid-column: span 12; }
  .nav { display: none; }
  .nav-toggle { display: block !important; }
  .page-head h1 { font-size: 20px; }
  .main { padding: 16px; }
  .topbar { padding: 10px 16px; }
}

/* 漢堡選單：桌面隱藏，手機顯示 */
.nav-toggle {
  display: none;
  background: none; border: 1px solid oklch(1 0 0 / 0.15);
  color: var(--paper-50); font-size: 20px;
  width: 40px; height: 40px; border-radius: 2px; cursor: pointer;
}
.mobile-nav {
  display: none;
  position: fixed; top: 60px; left: 0; right: 0; z-index: 100;
  background: var(--ink-900);
  border-bottom: 2px solid var(--brass-400);
  padding: 8px 16px;
  flex-direction: column; gap: 4px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--paper-50); text-decoration: none;
  padding: 12px 8px; font-size: 15px;
  border-bottom: 1px solid oklch(1 0 0 / 0.06);
}
.mobile-nav a.active { color: var(--brass-400); }
.mobile-nav a:last-child { border-bottom: none; }
.mnav-group { margin-bottom: 4px; }
.mnav-label {
  font-size: 11px; letter-spacing: .15em; color: var(--brass-400);
  padding: 8px 8px 4px; font-family: var(--font-mono);
}

/* Toast 手機版防溢出 */
.toast { max-width: calc(100vw - 32px); }
/* 表格手機版可橫向捲動 */
.table-wrap { overflow-x: auto; }