* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); font: 16px/1.6 "Segoe UI", Arial, sans-serif; }
main { width: min(100%, 1060px); margin: 0 auto; padding: 48px 24px; }
.eyebrow { color: var(--accent); letter-spacing: .08em; font-size: 13px; }
h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.2; margin: 16px 0; }
h2 { font-size: 21px; margin-top: 0; }
p { overflow-wrap: anywhere; }
.notice { border-left: 3px solid var(--accent); padding: 12px 16px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
.card { min-width: 0; padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.muted, footer { color: var(--muted); }
button { min-height: 44px; padding: 10px 18px; border: 1px solid var(--accent); border-radius: var(--radius); background: var(--accent); color: var(--on-accent); font: inherit; cursor: pointer; }
button:disabled { opacity: .65; cursor: wait; }
button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
footer { margin-top: 32px; font-size: 14px; }
@media (max-width: 600px) { main { padding: 28px 16px; } .grid { grid-template-columns: 1fr; } .card { padding: 20px; } button { width: 100%; } }

[hidden] { display: none !important; }
fieldset { min-width: 0; padding: 0; margin: 0; border: 0; }
label { display: block; margin: 12px 0 6px; }
input { display: block; width: 100%; min-width: 0; min-height: 44px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--background); color: var(--text); padding: 10px; font: inherit; }
input:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
#login-form button, #account-check, #logout-retry { margin-top: 16px; }
dt { color: var(--muted); margin-top: 12px; }
dd { margin: 0; overflow-wrap: anywhere; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.schedule-section { margin-top: 24px; }
.schedule-toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.schedule-toolbar button { width: auto; flex: 1 1 120px; }
.schedule-toolbar button[aria-pressed="false"] { background: var(--surface); color: var(--text); }
.schedule-date-controls { display: flex; gap: 8px; align-items: center; }
.schedule-date-controls button { width: 44px; flex: 0 0 44px; padding: 8px; }
.schedule-date-controls input { min-width: 0; width: 100%; flex: 1 1 0; }
.schedule-day { margin-top: 28px; }
.lesson-card { margin: 12px 0; padding: 16px; border: 1px solid var(--border); border-radius: 12px; overflow-wrap: anywhere; }
.lesson-card h4 { font-size: 18px; margin: 8px 0; }
.lesson-card p { margin: 8px 0; }
.lesson-time { color: var(--accent); }
.lesson-inactive { border-style: dashed; background: var(--soft); }
.change-badge { color: var(--accent); font-weight: 650; }
.change-detail { color: var(--muted); font-size: 14px; }

.academic-block { margin-top: 28px; overflow-wrap: anywhere; }
.academic-percent { font-size: 24px; color: var(--mint); }
progress { width: 100%; height: 16px; accent-color: var(--mint); }
summary { cursor: pointer; padding: 12px 0; overflow-wrap: anywhere; }
summary:focus-visible { outline: 3px solid var(--mint); outline-offset: 2px; }

select, textarea { width: 100%; min-width: 0; color: var(--text); background: var(--background); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; font: inherit; margin: 8px 0 16px; }
textarea { resize: vertical; }
select:focus-visible, textarea:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.request-text { white-space: pre-wrap; overflow-wrap: anywhere; }
.request-history { padding-left: 22px; border-left: 2px solid var(--border); }
.request-history li { margin-bottom: 20px; }
.request-detail { margin-top: 24px; overflow-wrap: anywhere; }

a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.page-navigation { margin-top: 18px; }
.settings-section { scroll-margin-top: 20px; }
.settings-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(220px, .8fr); gap: 28px; }
.settings-grid > section { min-width: 0; }
.settings-grid h3 { margin: 0 0 12px; }
#appearance-custom { width: 72px; height: 48px; padding: 4px; cursor: pointer; }
#appearance-reset, #logout, #logout-retry { margin-top: 12px; }
#appearance-contrast, #appearance-storage-status { min-height: 1.5em; }
#settings-account { padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--soft); }

@media (max-width: 600px) {
  .settings-grid { grid-template-columns: 1fr; gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}