/* 到了吗 — warm slate classroom (projection-first operate UI) */

:root {
  --slate-950: #14110e;
  --slate-900: #1c1814;
  --slate-800: #2a241e;
  --slate-700: #3a322a;
  --cream: #f4efe6;
  --cream-dim: #d8d0c4;
  --cream-mute: #a89f92;
  --chalk: #e8e0d4;
  --cork: #c9a46c;
  --cork-deep: #a67c3d;
  --terracotta: #c4785a;
  --success: #8fbc8f;
  --danger: #e07a6a;
  --line: rgba(244, 239, 230, 0.12);
  --line-strong: rgba(244, 239, 230, 0.22);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --radius-sm: 10px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

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

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--cream);
  background:
    radial-gradient(ellipse 90% 60% at 15% -10%, rgba(201, 164, 108, 0.14), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 0%, rgba(196, 120, 90, 0.1), transparent 50%),
    linear-gradient(180deg, var(--slate-900), var(--slate-950));
  background-attachment: fixed;
}

::selection {
  background: rgba(201, 164, 108, 0.35);
  color: var(--cream);
}

a {
  color: var(--cork);
  text-decoration: none;
}
a:hover {
  color: var(--cream);
}

/* —— chrome —— */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(20, 17, 14, 0.72);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--cream);
}
.brand-mark {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 6px;
  background:
    linear-gradient(145deg, var(--cork) 0%, var(--cork-deep) 55%, var(--terracotta) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.brand-mark::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.35), transparent 45%);
}

.top nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.top nav a {
  color: var(--cream-dim);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  font-size: 0.92rem;
}
.top nav a:hover,
.top nav a.is-active {
  color: var(--cream);
  background: rgba(244, 239, 230, 0.08);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}
main.draw-main {
  max-width: 1200px;
}
main.login-main {
  max-width: none;
  padding: 0;
  min-height: calc(100vh - 57px);
}

/* —— type —— */
h1 {
  margin: 0 0 0.35rem;
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  font-weight: 650;
  color: var(--cream);
}
.lede,
.muted {
  color: var(--cream-mute);
}
.muted.small,
.small {
  font-size: 0.875rem;
}
.crumb {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  color: var(--cream-mute);
}
.crumb a {
  color: var(--cream-dim);
}

/* —— surfaces —— */
.page {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel,
.card {
  background: linear-gradient(180deg, rgba(42, 36, 30, 0.92), rgba(28, 24, 20, 0.95));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.stat {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(244, 239, 230, 0.06);
  border: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--cream-dim);
}
.stat strong {
  color: var(--cork);
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}

.row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.row.between {
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}
.row.gap {
  gap: 0.6rem;
  flex-wrap: wrap;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 800px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* —— forms —— */
label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--cream-dim);
}
input,
textarea,
button,
select {
  font: inherit;
}
input[type="text"],
input[type="password"],
input[type="number"],
input:not([type]),
textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: rgba(14, 12, 10, 0.55);
  color: var(--cream);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus,
textarea:focus {
  border-color: var(--cork);
  box-shadow: 0 0 0 3px rgba(201, 164, 108, 0.22);
}
input::placeholder,
textarea::placeholder {
  color: var(--cream-mute);
}
textarea {
  resize: vertical;
  min-height: 8rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.45;
}
input[type="file"] {
  font-size: 0.85rem;
  color: var(--cream-dim);
}

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(244, 239, 230, 0.06);
  color: var(--cream);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
}
button:hover,
.btn:hover {
  background: rgba(244, 239, 230, 0.12);
  color: var(--cream);
}
button:active,
.btn:active {
  transform: translateY(1px);
}
button:focus-visible,
.btn:focus-visible,
a:focus-visible {
  outline: 2px solid var(--cork);
  outline-offset: 2px;
}
button.primary,
.btn.primary {
  background: linear-gradient(180deg, #d4b07a, var(--cork-deep));
  border-color: transparent;
  color: #1a140e;
  font-weight: 650;
  box-shadow: 0 8px 24px rgba(166, 124, 61, 0.35);
}
button.primary:hover,
.btn.primary:hover {
  filter: brightness(1.06);
  color: #1a140e;
}
button.huge {
  padding: 0.95rem 2rem;
  font-size: 1.25rem;
  min-width: 8rem;
}
button.danger,
.btn.danger {
  color: var(--danger);
  border-color: rgba(224, 122, 106, 0.35);
}
button.ghost,
.btn.ghost {
  background: transparent;
}
button.linkish {
  background: none;
  border: none;
  color: var(--cream-mute);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
}
button.linkish:hover {
  color: var(--cream);
  background: rgba(244, 239, 230, 0.08);
}
form.inline {
  display: inline;
  margin: 0;
}

.error {
  color: #ffb4a8;
  background: rgba(224, 122, 106, 0.12);
  border: 1px solid rgba(224, 122, 106, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  margin: 0;
}
.error.big {
  font-size: 1.15rem;
  text-align: center;
}

/* —— class list —— */
.class-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.class-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(42, 36, 30, 0.65);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.class-list li:hover {
  border-color: rgba(201, 164, 108, 0.35);
  background: rgba(42, 36, 30, 0.9);
}
.class-list a.class-name {
  font-size: 1.15rem;
  font-weight: 650;
  color: var(--cream);
}
.class-list .actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.empty-state {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
}
.empty-state img {
  width: min(220px, 55vw);
  height: auto;
  margin: 0 auto 1rem;
  display: block;
  border-radius: 14px;
  opacity: 0.95;
  box-shadow: var(--shadow);
}
.empty-state p {
  margin: 0.35rem auto;
  max-width: 28rem;
}

/* —— table —— */
table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
th,
td {
  text-align: left;
  padding: 0.7rem 0.55rem;
  border-bottom: 1px solid var(--line);
}
th {
  color: var(--cream-mute);
  font-weight: 550;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
tbody tr:hover td {
  background: rgba(244, 239, 230, 0.03);
}
td:last-child {
  width: 1%;
  white-space: nowrap;
}

/* —— history —— */
.history {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.history li {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(14, 12, 10, 0.35);
}
.history time,
.history .meta {
  color: var(--cream-mute);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}
.history.long li {
  padding: 1rem 1.15rem;
}

/* —— login —— */
.login-shell {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  min-height: calc(100vh - 57px);
}
@media (max-width: 900px) {
  .login-shell {
    grid-template-columns: 1fr;
  }
  .login-hero {
    min-height: 220px;
  }
}
.login-hero {
  position: relative;
  overflow: hidden;
  background: #1a1612 center/cover no-repeat;
}
.login-hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.login-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 40%, rgba(20, 17, 14, 0.55) 100%),
    linear-gradient(180deg, rgba(20, 17, 14, 0.15), rgba(20, 17, 14, 0.55));
}
.login-hero-caption {
  position: absolute;
  left: 1.5rem;
  bottom: 1.5rem;
  z-index: 1;
  max-width: 22rem;
}
.login-hero-caption .tag {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(20, 17, 14, 0.55);
  border: 1px solid var(--line-strong);
  color: var(--cork);
  font-size: 0.78rem;
  margin-bottom: 0.55rem;
}
.login-hero-caption h2 {
  font-size: 1.45rem;
  margin: 0 0 0.35rem;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.5);
}
.login-hero-caption p {
  margin: 0;
  color: var(--cream-dim);
  font-size: 0.92rem;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.45);
}

.login-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(201, 164, 108, 0.08), transparent 50%),
    var(--slate-950);
}
.login-card {
  width: min(400px, 100%);
  padding: 2rem 1.75rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(165deg, rgba(58, 50, 42, 0.55), rgba(28, 24, 20, 0.92));
  box-shadow: var(--shadow);
}
.login-card h1 {
  font-size: 2rem;
}
.login-card .lede {
  margin: 0 0 1.35rem;
}
.login-card button.primary {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.8rem 1rem;
}

/* —— draw stage —— */
.draw-stage {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.draw-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(28, 24, 20, 0.75);
}
.draw-bar a {
  color: var(--cream-dim);
  font-weight: 550;
}
.draw-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px dashed rgba(201, 164, 108, 0.35);
  background: rgba(201, 164, 108, 0.05);
}
.count-label {
  flex-direction: row;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.15rem;
  color: var(--cream);
}
.count-label input {
  width: 4.5rem;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.results {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.results.single,
.results#reveal-card {
  display: block;
  max-width: min(720px, 92vw);
  margin: 1.25rem auto 0;
  padding: 2.5rem 2rem 2.25rem;
  border-radius: 22px;
  text-align: center;
  background:
    linear-gradient(165deg, rgba(201, 164, 108, 0.2), transparent 42%),
    linear-gradient(180deg, #3a322a, #221c17);
  border: 1px solid rgba(201, 164, 108, 0.4);
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  opacity: 0;
  transform: translateY(16px) scale(0.96);
}
.results.single.is-in {
  animation: card-in 0.5s cubic-bezier(0.2, 0.85, 0.25, 1) both;
}
.results li {
  position: relative;
  padding: 1.75rem 1.35rem 1.5rem;
  border-radius: 18px;
  text-align: center;
  background:
    linear-gradient(165deg, rgba(201, 164, 108, 0.18), transparent 42%),
    linear-gradient(180deg, #3a322a, #221c17);
  border: 1px solid rgba(201, 164, 108, 0.35);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  animation: card-in 0.45s cubic-bezier(0.2, 0.85, 0.25, 1) both;
}
.results .name,
.results .no {
  font-size: clamp(2.4rem, 8vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: #f5f5f7;
}
.results .name {
  margin-bottom: 14px;
}
.results .no {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.reveal-stage {
  min-height: 14rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.reveal-progress {
  margin: 0.5rem 0 0;
  font-size: 1.05rem;
  color: var(--cork);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}
.reveal-done {
  margin-top: 1rem;
  text-align: center;
}
.hint {
  text-align: center;
  color: var(--cream-mute);
  font-size: 1.05rem;
  max-width: 32rem;
  margin: 2rem auto;
  line-height: 1.6;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .results li,
  .results.single.is-in {
    animation: none;
    opacity: 1;
    transform: none;
  }
  button,
  .btn {
    transition: none;
  }
}