/* =========================================================================
 * 课件工作台 — shared design tokens + component primitives
 * Neutral Modern · cobalt accent · off-white surfaces
 * ========================================================================= */

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-warm: #ffffff;
  --fg: #111111;
  --fg-2: #111111;
  --muted: #6b6b6b;
  --meta: #6b6b6b;
  --border: #e5e5e5;
  --border-soft: #efefef;
  --accent: #2f6feb;
  --accent-on: #ffffff;
  --accent-hover: color-mix(in oklab, #2f6feb, black 8%);
  --accent-active: color-mix(in oklab, #2f6feb, black 14%);
  --success: #17a34a;
  --warn: #eab308;
  --danger: #dc2626;
  --danger-bg: #fff1f0;
  --warn-bg: #fff8db;
  --success-bg: #e7f6ec;

  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono:    ui-monospace, "JetBrains Mono", "SF Mono", Menlo, monospace;

  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 17px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  --text-4xl: 44px;
  --text-5xl: 56px;

  --leading-body: 1.55;
  --leading-tight: 1.2;
  --tracking-display: -0.01em;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --elev-flat: none;
  --elev-ring: 0 0 0 1px var(--border);
  --elev-raised: 0 2px 8px color-mix(in oklab, #111, transparent 92%);
  --elev-pop: 0 8px 24px color-mix(in oklab, #111, transparent 88%);

  --focus-ring: 0 0 0 3px color-mix(in oklab, #2f6feb, transparent 70%);

  --motion-fast: 150ms;
  --motion-base: 200ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  --container-max: 1280px;
  --topnav-h: 56px;
}

/* Reset + base ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { color-scheme: light; }
/* `hidden` must win over display utilities (e.g. .modal { display: grid }) */
[hidden] { display: none !important; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
input, button, select, textarea { font: inherit; color: inherit; }
img, svg { display: block; max-width: 100%; }

/* Focus rings ============================================================= */
:where(button, a, input, textarea, select, [role="button"]):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* Top navigation ========================================================== */
.topnav {
  height: var(--topnav-h);
  background: color-mix(in oklab, var(--surface), transparent 0%);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-6);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
}
.topnav .brand { display: inline-flex; align-items: center; gap: var(--space-2); }
.brand-mark {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-on);
  display: inline-flex; align-items: center; justify-content: center;
}
.brand-name { font-weight: 600; letter-spacing: -0.01em; }
.topnav-spacer { flex: 1; }
.topnav-meta { color: var(--muted); font-size: var(--text-sm); display: flex; gap: var(--space-3); align-items: center; }

/* Topnav tabs + ghost buttons (generated by core.js mountTopnav) ============= */
.topnav-tabs { display: flex; align-items: center; gap: var(--space-1); flex-wrap: nowrap; }
.ghost-btn {
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
}
.ghost-btn:hover { background: var(--bg); color: var(--fg); }
.ghost-btn.is-active { background: color-mix(in oklab, var(--accent), transparent 88%); color: var(--accent); }
.user-chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-1);
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  background: var(--surface); color: var(--fg); font-size: var(--text-sm); cursor: pointer;
}
.user-chip:hover { background: var(--bg); }
.user-chip .avatar {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); color: var(--accent-on);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: var(--text-xs); font-weight: 600;
}
.project-chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  background: var(--bg); font-size: var(--text-xs); color: var(--muted);
}
.project-chip-id { color: var(--fg); font-family: var(--font-mono); }

/* App layout shell (used by dashboard/workstation) ======================== */
.app { min-height: 100vh; display: grid; grid-template-rows: var(--topnav-h) 1fr; }

/* Buttons ================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 500;
  font-size: var(--text-base);
  line-height: 1;
  background: transparent;
  color: var(--fg);
  transition: background var(--motion-fast) var(--ease-standard),
              border-color var(--motion-fast) var(--ease-standard),
              color var(--motion-fast) var(--ease-standard);
  white-space: nowrap;
  user-select: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-on);
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-primary:active { background: var(--accent-active); border-color: var(--accent-active); }
.btn-secondary {
  background: var(--surface);
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: #cfcfcf; background: var(--surface); }
.btn-ghost { background: transparent; color: var(--fg); }
.btn-ghost:hover { background: color-mix(in oklab, var(--fg), transparent 92%); }
.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}
.btn-danger:hover { background: color-mix(in oklab, var(--danger), black 8%); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 10px; font-size: var(--text-sm); border-radius: var(--radius-sm); }
.btn-icon { width: 32px; height: 32px; padding: 0; }
.btn-link { background: transparent; border: 0; color: var(--accent); padding: 0; }
.btn-link:hover { text-decoration: underline; }

/* Form fields ============================================================== */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-4); }
.field label { font-size: var(--text-sm); font-weight: 500; color: var(--fg); }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--fg);
  font-size: var(--text-base);
  transition: border-color var(--motion-fast) var(--ease-standard),
              box-shadow var(--motion-fast) var(--ease-standard);
}
.field input::placeholder,
.field textarea::placeholder { color: #b3b3b3; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent), transparent 80%);
}
.field-row { display: flex; align-items: center; gap: var(--space-3); }
.field-row-between { justify-content: space-between; }
.field-help { color: var(--muted); font-size: var(--text-xs); margin: 4px 0 0; }

.input-wrap { position: relative; }
.input-wrap input { padding-right: 38px; }
.input-trailing {
  position: absolute;
  right: 6px; top: 50%;
  transform: translateY(-50%);
  width: 28px; height: 28px;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--muted);
  display: inline-flex; align-items: center; justify-content: center;
}
.input-trailing:hover { background: color-mix(in oklab, var(--fg), transparent 92%); }

.captcha-row { display: grid; grid-template-columns: 1fr auto; gap: var(--space-3); align-items: stretch; }
.captcha-tile {
  height: 38px;
  width: 120px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--accent), white 80%), color-mix(in oklab, var(--accent), white 92%));
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  letter-spacing: 0.18em;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 17px;
  position: relative;
  overflow: hidden;
}
.captcha-tile::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(45deg, transparent 0 6px, color-mix(in oklab, var(--fg), transparent 92%) 6px 7px),
    repeating-linear-gradient(-30deg, transparent 0 9px, color-mix(in oklab, var(--accent), transparent 80%) 9px 10px);
  opacity: 0.55;
}
.captcha-tile > * { position: relative; z-index: 1; }
.captcha-tile:hover { border-color: #cfcfcf; }

.checkbox { display: inline-flex; align-items: center; gap: var(--space-2); cursor: pointer; user-select: none; font-size: var(--text-sm); }
.checkbox input { position: absolute; opacity: 0; pointer-events: none; }
.checkbox-box {
  width: 16px; height: 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  position: relative;
  transition: background var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard);
}
.checkbox input:checked + .checkbox-box { background: var(--accent); border-color: var(--accent); }
.checkbox input:checked + .checkbox-box::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 5px; height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-error {
  display: flex; align-items: flex-start; gap: var(--space-2);
  padding: 10px 12px;
  border: 1px solid color-mix(in oklab, var(--danger), white 60%);
  background: var(--danger-bg);
  color: color-mix(in oklab, var(--danger), black 18%);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

/* Badges =================================================================== */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: color-mix(in oklab, var(--accent), white 88%);
  color: var(--accent);
  border: 1px solid color-mix(in oklab, var(--accent), white 76%);
  white-space: nowrap;
}
.badge-muted {
  background: color-mix(in oklab, var(--fg), transparent 92%);
  color: var(--muted);
  border-color: color-mix(in oklab, var(--fg), transparent 88%);
}
.badge-success {
  background: var(--success-bg);
  color: color-mix(in oklab, var(--success), black 16%);
  border-color: color-mix(in oklab, var(--success), white 70%);
}
.badge-warn {
  background: var(--warn-bg);
  color: color-mix(in oklab, #b08300, black 10%);
  border-color: color-mix(in oklab, var(--warn), white 70%);
}
.badge-danger {
  background: var(--danger-bg);
  color: color-mix(in oklab, var(--danger), black 18%);
  border-color: color-mix(in oklab, var(--danger), white 65%);
}
.badge-dot { padding-left: 6px; }
.badge-dot::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

/* Card / surface ========================================================== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--elev-flat);
}
.card-pad { padding: var(--space-5); }

/* Modal ==================================================================== */
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; }
.modal-backdrop { position: absolute; inset: 0; background: color-mix(in oklab, var(--fg), transparent 70%); }
.modal-panel {
  position: relative;
  width: min(440px, 92vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--elev-pop);
  padding: var(--space-6);
}
.modal-head { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.modal-head h3 { margin: 0; font-size: var(--text-lg); font-weight: 600; }
.modal-body { color: var(--muted); font-size: var(--text-sm); }
.modal-body p { margin: 0 0 var(--space-3); }
.modal-foot { display: flex; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-5); }

/* Misc ===================================================================== */
.muted { color: var(--muted); }
.muted-sm { color: var(--muted); font-size: var(--text-sm); }
.kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  background: color-mix(in oklab, var(--fg), transparent 92%);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.divider { height: 1px; background: var(--border); margin: var(--space-6) 0; }
.link { color: var(--accent); }
.link:hover { text-decoration: underline; }
.link-quiet { color: var(--muted); font-size: var(--text-sm); }
.link-quiet:hover { color: var(--fg); }

.auth-divider {
  display: flex; align-items: center; gap: var(--space-3);
  margin: var(--space-5) 0;
  color: var(--muted);
  font-size: var(--text-sm);
}
.auth-divider::before, .auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Auth layout ============================================================= */
body.auth {
  background:
    radial-gradient(1200px 600px at 100% -10%, color-mix(in oklab, var(--accent), white 92%), transparent 70%),
    radial-gradient(800px 500px at -10% 110%, color-mix(in oklab, #16a394, white 92%), transparent 70%),
    var(--bg);
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-6);
}
.auth-shell {
  width: min(1080px, 100%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--elev-raised);
}
.auth-card { padding: 56px 56px 48px; }
.auth-head { margin-bottom: var(--space-6); }
.auth-title { font-size: var(--text-2xl); margin: 24px 0 6px; font-weight: 600; letter-spacing: -0.01em; }
.auth-sub { color: var(--muted); margin: 0; font-size: var(--text-base); }
.auth-foot { margin: var(--space-6) 0 0; color: var(--muted); font-size: var(--text-sm); text-align: center; }
.auth-aside {
  background: linear-gradient(180deg, #f6f8fb 0%, #fafbfd 100%);
  padding: 56px;
  border-left: 1px solid var(--border);
  display: flex;
  align-items: center;
}
.auth-aside-inner { max-width: 420px; }
.auth-aside-title { font-size: var(--text-3xl); line-height: 1.2; margin: 16px 0 12px; letter-spacing: -0.01em; font-weight: 600; }
.auth-aside-body { color: var(--muted); margin: 0 0 var(--space-5); }
.auth-aside-list { list-style: none; padding: 0; margin: 0 0 var(--space-6); display: grid; gap: 10px; }
.auth-aside-list li { display: flex; align-items: center; gap: 10px; font-size: var(--text-base); }
.auth-aside-list .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}
.auth-aside-card {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-4);
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: var(--space-4);
  align-items: center;
}
.auth-aside-card figcaption strong { display: block; font-weight: 600; }
.auth-aside-card figcaption span { color: var(--muted); font-size: var(--text-sm); }

.ph-canvas {
  width: 96px; height: 64px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, #fff, #fafafa);
  display: grid; place-items: center;
  overflow: hidden;
}
.ph-slide { width: 88%; height: 84%; display: flex; flex-direction: column; gap: 4px; }
.ph-title { font-size: 8px; font-weight: 600; letter-spacing: 0.06em; color: var(--fg); }
.ph-bars { display: grid; gap: 3px; }
.ph-bars i { display: block; height: 4px; background: color-mix(in oklab, var(--fg), transparent 80%); border-radius: 2px; }
.ph-bars i:nth-child(1) { width: 70%; }
.ph-bars i:nth-child(2) { width: 50%; }
.ph-bars i:nth-child(3) { width: 60%; background: color-mix(in oklab, var(--accent), white 60%); }

/* Generic page chrome ====================================================== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6); width: 100%; }
.page { padding: var(--space-8) 0 var(--space-12); }
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: var(--space-6); margin-bottom: var(--space-6); }
.page-head h1 { font-size: var(--text-3xl); margin: 0 0 6px; font-weight: 600; letter-spacing: -0.01em; }
.page-head p { color: var(--muted); margin: 0; }

/* Responsive auth (collapse to single column on phones) ==================== */
@media (max-width: 920px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-aside { display: none; }
  .auth-card { padding: 40px 28px; }
}
@media (max-width: 540px) {
  body.auth { padding: 0; }
  .auth-shell { border-radius: 0; min-height: 100vh; }
}

/* Layout primitives ======================================================== */
.row { display: flex; align-items: center; gap: var(--space-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.stack-2 > * + * { margin-top: var(--space-2); }
.stack-3 > * + * { margin-top: var(--space-3); }
.stack-4 > * + * { margin-top: var(--space-4); }
.stack-5 > * + * { margin-top: var(--space-5); }
.stack-6 > * + * { margin-top: var(--space-6); }
.grid { display: grid; gap: var(--space-4); }

/* Section header used in dashboards ======================================== */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-4); }
.section-head h2 { margin: 0; font-size: var(--text-xl); font-weight: 600; letter-spacing: -0.01em; }
.section-head .muted-sm { color: var(--muted); font-size: var(--text-sm); }