/* Tempanion Design System — 統一視覺基準 (來源：dashboard-new.html)
 * 可被所有頁面 import：<link rel="stylesheet" href="/src/css/design-system.css">
 */

/* 以 :where(:root) 降低特異度，避免覆蓋個別頁面自訂主題 */
:where(:root) {
  /* 主色 (teacher/綠) */
  --bg: #f0f9f4;
  --bg-2: #e6f7ed;
  --accent: #10b981;
  --accent-2: #34d399;
  --accent-dark: #047857;
  --accent-light: #a7f3d0;

  /* 管理者主色 (橘) — 用 body.theme-admin 切換 */
  --admin-accent: #ff8c42;
  --admin-accent-2: #ffb366;
  --admin-accent-dark: #cc5f00;
  --admin-bg: #fff7f0;

  /* 文字 */
  --text: #1c261e;
  --muted: #6b7280;
  --text-light: #9ca3af;

  /* 介面 */
  --card-bg: #fff;
  --border: #a7f3d0;
  --border-light: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 10px 30px rgba(16,185,129,.2);

  /* 狀態 */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* 尺寸 */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;

  /* 字體 */
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

/* 管理者主題（橘）— 以 body.theme-admin 明確覆蓋，特異度 > :where(:root) */
body.theme-admin {
  --bg: var(--admin-bg, #fff7f0);
  --accent: var(--admin-accent, #ff8c42);
  --accent-2: var(--admin-accent-2, #ffb366);
  --accent-dark: var(--admin-accent-dark, #cc5f00);
  --accent-light: #ffd9b8;
  --border: #ffd9b8;
  --shadow-lg: 0 10px 30px rgba(255,140,66,.2);
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header / Nav */
.ts-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
}
.ts-nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.ts-brand {
  font-weight: 800;
  color: var(--accent-dark);
  letter-spacing: .3px;
  font-size: 1.2rem;
}
.ts-nav-menu { display: flex; gap: 1.5rem; align-items: center; }
.ts-nav-menu a { color: var(--muted); font-weight: 600; }
.ts-nav-menu a:hover, .ts-nav-menu a.active { color: var(--accent-dark); }

/* Buttons */
.ts-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .6rem 1.2rem;
  border-radius: var(--radius-full);
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-weight: 700;
  font-size: .95rem;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s;
  text-decoration: none;
  font-family: inherit;
}
.ts-btn:hover { transform: translateY(-1px); text-decoration: none; opacity: .95; }
.ts-btn:active { transform: translateY(0); }
.ts-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.ts-btn.secondary {
  background: #fff;
  color: var(--accent-dark);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.ts-btn.ghost { background: transparent; color: var(--accent-dark); box-shadow: none; }
.ts-btn.danger { background: linear-gradient(180deg, #f87171, var(--danger)); box-shadow: 0 10px 30px rgba(239,68,68,.25); }
.ts-btn.sm { padding: .4rem .8rem; font-size: .85rem; }
.ts-btn.lg { padding: .85rem 1.6rem; font-size: 1.05rem; }

/* Card */
.ts-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
}
.ts-card h2, .ts-card h3 { margin-top: 0; }

/* Grid */
.ts-grid { display: grid; gap: 1.25rem; }
.ts-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.ts-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.ts-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 968px) { .ts-grid.cols-3, .ts-grid.cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .ts-grid.cols-2, .ts-grid.cols-3, .ts-grid.cols-4 { grid-template-columns: 1fr; } }

/* Container */
.ts-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Forms */
.ts-field { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1rem; }
.ts-label { font-weight: 600; color: var(--text); font-size: .9rem; }
.ts-input, .ts-select, .ts-textarea {
  width: 100%;
  padding: .7rem .9rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.ts-input:focus, .ts-select:focus, .ts-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(16,185,129,.15);
}
.ts-textarea { min-height: 100px; resize: vertical; }

/* Avatar */
.ts-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
}
.ts-avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.ts-avatar.lg { width: 64px; height: 64px; font-size: 1.3rem; }
.ts-avatar.xl { width: 96px; height: 96px; font-size: 2rem; }

/* Badge */
.ts-badge {
  display: inline-block;
  padding: .2rem .6rem;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent-dark);
  font-size: .8rem;
  font-weight: 600;
}
.ts-badge.warning { background: #fef3c7; color: #92400e; }
.ts-badge.danger  { background: #fee2e2; color: #991b1b; }
.ts-badge.info    { background: #dbeafe; color: #1e40af; }

/* Toast — 由 JS util 產生 */
.ts-toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  pointer-events: none;
}
.ts-toast {
  background: #fff;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: .8rem 1.2rem;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
  min-width: 260px;
  max-width: 400px;
  font-size: .95rem;
  pointer-events: auto;
  animation: tsToastIn .25s ease;
}
.ts-toast.success { border-left-color: var(--success); }
.ts-toast.error   { border-left-color: var(--danger); }
.ts-toast.warning { border-left-color: var(--warning); }
.ts-toast.info    { border-left-color: var(--info); }
.ts-toast.fadeout { animation: tsToastOut .25s ease forwards; }
@keyframes tsToastIn  { from { opacity: 0; transform: translateX(20px);} to { opacity: 1; transform: translateX(0);} }
@keyframes tsToastOut { to   { opacity: 0; transform: translateX(20px);} }

/* Language switcher */
.ts-lang-switch {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .3rem .7rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  background: #fff;
  font-size: .85rem;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
}
.ts-lang-switch:hover { border-color: var(--accent); color: var(--accent-dark); }

/* Utility */
.ts-muted { color: var(--muted); }
.ts-text-center { text-align: center; }
.ts-mt-0 { margin-top: 0; }
.ts-mt-1 { margin-top: .5rem; }
.ts-mt-2 { margin-top: 1rem; }
.ts-mt-3 { margin-top: 1.5rem; }
.ts-mt-4 { margin-top: 2rem; }
.ts-flex { display: flex; }
.ts-flex-1 { flex: 1; }
.ts-items-center { align-items: center; }
.ts-justify-between { justify-content: space-between; }
.ts-gap-1 { gap: .5rem; }
.ts-gap-2 { gap: 1rem; }
.ts-hidden { display: none !important; }

/* ----- 全站視覺協調 (P3) ----- */
html body { font-family: var(--font-sans); }
html { scroll-behavior: smooth; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
button:focus-visible, a:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
  box-shadow: 0 0 0 3px rgba(16,185,129,.25);
}
body.theme-admin button:focus-visible,
body.theme-admin a:focus-visible,
body.theme-admin input:focus-visible,
body.theme-admin select:focus-visible,
body.theme-admin textarea:focus-visible {
  box-shadow: 0 0 0 3px rgba(255,140,66,.28);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

::selection { background: var(--accent-light); color: var(--text); }