:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #16181d;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-contrast: #ffffff;
  --color-success-bg: #ecfdf5;
  --color-success-text: #047857;
  --color-danger-bg: #fef2f2;
  --color-danger-text: #b91c1c;
  --color-muted-bg: #f3f4f6;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #101114;
    --color-surface: #1a1b1f;
    --color-text: #f2f3f5;
    --color-text-muted: #9ca3af;
    --color-border: #2c2e33;
    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-contrast: #0b0b0d;
    --color-success-bg: #062e22;
    --color-success-text: #34d399;
    --color-danger-bg: #350c0c;
    --color-danger-text: #f87171;
    --color-muted-bg: #202126;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.3);
  }

  html {
    color-scheme: dark;
  }
}

html {
  height: 100%;
}

html,
body {
  max-width: 100vw;
  overflow-x: hidden;
}

body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Sans", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

body,
h1,
h2,
h3,
p,
ul {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font-family: inherit;
  font-size: 1rem;
}

/* Layout */

.page {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.topbar {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.topbar-inner {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-dot {
  color: var(--color-primary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.topbar-actions form {
  margin: 0;
}

.topbar-user {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Typography */

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.page-subtitle {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  margin-bottom: 24px;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

/* Card */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
}

.card + .card {
  margin-top: 16px;
}

/* Form controls */

.field-row {
  display: flex;
  gap: 10px;
}

.input {
  flex: 1;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.15s ease;
}

.input:focus {
  border-color: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-link {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.field + .field {
  margin-top: 16px;
}

.field-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.field .input {
  width: 100%;
}

.field-hint {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-top: 6px;
}

.form-actions {
  margin-top: 20px;
}

.btn-link:hover {
  color: var(--color-text);
}

.error-text {
  color: var(--color-danger-text);
  font-size: 0.875rem;
  margin-top: 8px;
}

.empty-text {
  color: var(--color-text-muted);
  font-size: 0.925rem;
}

.btn-google {
  width: 100%;
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-google:hover:not(:disabled) {
  background: var(--color-muted-bg);
}

/* Lists */

.list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.list-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--color-border);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item-title {
  font-weight: 500;
}

.list-item-meta {
  color: var(--color-text-muted);
  font-size: 0.825rem;
  white-space: nowrap;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
}

/* Definition list (student profile) */

.profile {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 20px;
  margin: 0;
  font-size: 0.925rem;
}

.profile dt {
  color: var(--color-text-muted);
}

.profile dd {
  margin: 0;
}

/* Flash */

.flash {
  width: 100%;
  max-width: 640px;
  margin: 16px auto -8px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-success-bg);
  color: var(--color-success-text);
  font-size: 0.9rem;
  font-weight: 600;
}

.flash-alert {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-count {
  background: var(--color-muted-bg);
  color: var(--color-text);
}

/* QR code */

.qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

/* QRコードはrqrcodeがSVGで吐く。暗所でも読み取れるよう、ダークモードでも
   白地・黒モジュールのまま表示させる。 */
.qr-code {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 12px;
  background: #ffffff;
  line-height: 0;
}

.qr-code svg {
  display: block;
  width: 240px;
  height: 240px;
}

.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.list-header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.qr-url {
  word-break: break-all;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Full-screen status page (student attend flow) */

.status-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.status-card {
  width: 100%;
  max-width: 380px;
  text-align: center;
  padding: 40px 28px;
}

.status-icon {
  font-size: 2.75rem;
  line-height: 1;
  margin-bottom: 16px;
}

.status-heading {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.status-detail {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* 出席完了後の導線（プロフィール登録・履歴確認） */
.status-action {
  width: 100%;
  margin-top: 24px;
}

.status-note {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-top: 12px;
}

.status-card.success .status-heading {
  color: var(--color-success-text);
}

.status-card.error .status-heading {
  color: var(--color-danger-text);
}

.spinner {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}