@charset "UTF-8";

:root {
  --canvas: #f4f5f2;
  --surface: #ffffff;
  --surface-subtle: #f8f9f7;
  --ink: #17211c;
  --ink-soft: #4f5d55;
  --muted: #707b74;
  --line: #dfe3df;
  --line-strong: #c8cfca;
  --brand: #17684d;
  --brand-strong: #0f513a;
  --brand-soft: #e7f0eb;
  --brand-wash: #f1f6f3;
  --on-brand: #ffffff;
  --brand-dot: #b07b2a;
  --status-dot: #3b9973;
  --warning: #8a641e;
  --warning-soft: #f8f0df;
  --warning-line: #c29139;
  --warning-ink: #73591f;
  --focus: #8abca8;
  --control-hover: #9ba8a0;
  --accent-border: #9fb7ab;
  --selected-border: #9ab5a7;
  --result-border: #cadbd2;
  --period-busy: #eef0ee;
  --period-busy-text: #858d88;
  --period-free: #e9f0ec;
  --period-free-text: #47725d;
  --state-icon: #799486;
  --header-bg: rgb(244 245 242 / 94%);
  --back-to-top-bg: rgb(255 255 255 / 94%);
  --dialog-backdrop: rgb(20 29 24 / 54%);
  --dialog-shadow: 0 24px 80px rgb(23 33 28 / 24%);
  --noscript-bg: #fff3cc;
  --shadow-low: 0 1px 2px rgb(23 33 28 / 5%), 0 8px 24px rgb(23 33 28 / 4%);
  color: var(--ink);
  background: var(--canvas);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-synthesis: none;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --canvas: #111613;
  --surface: #181e1a;
  --surface-subtle: #1d2420;
  --ink: #eef3ef;
  --ink-soft: #c1cbc4;
  --muted: #929e96;
  --line: #2c3530;
  --line-strong: #435047;
  --brand: #6bcba5;
  --brand-strong: #92debf;
  --brand-soft: #243c33;
  --brand-wash: #1a2b24;
  --on-brand: #102019;
  --brand-dot: #dda94e;
  --status-dot: #53b68e;
  --warning: #e0b85f;
  --warning-soft: #302817;
  --warning-line: #b98d37;
  --warning-ink: #f0cc7b;
  --focus: #78c9a8;
  --control-hover: #68776e;
  --accent-border: #557466;
  --selected-border: #4f7e69;
  --result-border: #3d6755;
  --period-busy: #252c28;
  --period-busy-text: #9ca69f;
  --period-free: #20342b;
  --period-free-text: #8fd4b7;
  --state-icon: #86aa99;
  --header-bg: rgb(17 22 19 / 94%);
  --back-to-top-bg: rgb(24 30 26 / 96%);
  --dialog-backdrop: rgb(2 5 3 / 72%);
  --dialog-shadow: 0 24px 80px rgb(0 0 0 / 48%);
  --noscript-bg: #443719;
  --shadow-low: 0 1px 2px rgb(0 0 0 / 24%), 0 8px 24px rgb(0 0 0 / 18%);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--canvas); }
button, input, select { font: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
button { color: inherit; cursor: pointer; }
button:disabled { cursor: default; opacity: .42; }
a { color: inherit; text-decoration: none; }
svg { width: 20px; height: 20px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
button svg { pointer-events: none; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin: 0; letter-spacing: 0; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 50; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 6px; background: var(--surface); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header { position: sticky; top: 0; z-index: 20; height: 66px; border-bottom: 1px solid var(--line-strong); background: var(--header-bg); backdrop-filter: blur(12px); }
.header-inner, .page, .site-footer { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; }
.brand-mark { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 7px; color: var(--on-brand); background: var(--brand); box-shadow: inset 0 0 0 1px rgb(255 255 255 / 18%); }
.brand-mark svg { width: 22px; height: 22px; }
.brand-lockup { display: flex; align-items: baseline; gap: 12px; }
.brand strong { font-size: 20px; line-height: 1; font-weight: 720; }
.brand-dot { color: var(--brand-dot); }
.brand-description { padding-left: 12px; border-left: 1px solid var(--line-strong); color: var(--muted); font-size: 12px; }
.about-link { display: inline-flex; min-height: 44px; align-items: center; gap: 7px; color: var(--ink-soft); font-size: 12px; transition: color .16s ease; }
.about-link:hover { color: var(--brand); }
.about-link svg { width: 16px; height: 16px; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.theme-switcher { display: grid; grid-template-columns: repeat(3, 30px); gap: 2px; padding: 2px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface-subtle); }
.theme-option { display: grid; width: 30px; height: 30px; padding: 0; place-items: center; border: 0; border-radius: 5px; color: var(--muted); background: transparent; transition: color .16s ease, background-color .16s ease, box-shadow .16s ease; }
.theme-option:hover { color: var(--ink-soft); }
.theme-option[aria-checked="true"] { color: var(--brand); background: var(--surface); box-shadow: 0 0 0 1px var(--line-strong), var(--shadow-low); }
.theme-option svg { width: 15px; height: 15px; }

.page { padding-bottom: 24px; }
.hero { min-height: 196px; display: grid; grid-template-columns: minmax(0, 1fr) 510px; align-items: center; gap: 64px; padding: 30px 0 28px; }
.eyebrow { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; color: var(--brand); font-size: 12px; font-weight: 650; }
.eyebrow > span, .status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--status-dot); }
h1 { font-size: 40px; line-height: 1.25; font-weight: 720; }

.semester-status { display: grid; grid-template-columns: 1.1fr 1.5fr; gap: 18px 24px; align-items: center; padding: 18px 0 14px; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); }
.semester-heading { display: flex; align-items: center; gap: 10px; }
.semester-heading svg { width: 18px; height: 18px; color: var(--brand); }
.semester-heading div { display: flex; flex-direction: column; gap: 3px; }
.semester-heading span { color: var(--muted); font-size: 10px; }
.semester-heading strong { color: var(--ink-soft); font-size: 12px; font-weight: 650; }
.semester-stats { display: grid; grid-template-columns: repeat(3, 1fr); }
.semester-stats > div { display: flex; flex-direction: column; gap: 3px; padding-left: 18px; border-left: 1px solid var(--line); }
.semester-stats strong { font-size: 21px; line-height: 1.1; font-weight: 680; font-variant-numeric: tabular-nums; }
.semester-stats span { color: var(--muted); font-size: 10px; }
.semester-range { grid-column: 1 / -1; display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 10px; }

.query-panel { padding: 20px 22px 18px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); box-shadow: var(--shadow-low); }
.section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; }
.section-heading > div { display: flex; align-items: baseline; gap: 10px; }
.section-index { color: var(--brand); font-size: 11px; font-weight: 750; font-variant-numeric: tabular-nums; }
.section-heading h2 { font-size: 16px; line-height: 1.35; font-weight: 680; }
.section-heading > p { color: var(--muted); font-size: 11px; line-height: 1.6; }
.query-heading { margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
.primary-filters { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(220px, .6fr); gap: 18px 22px; }
.field { min-width: 0; }
.field label, .period-label { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-bottom: 7px; color: var(--ink-soft); font-size: 11px; font-weight: 650; }
.field label > span, .period-label > span:last-child { color: var(--muted); font-size: 10px; font-weight: 500; }

input, select { width: 100%; min-width: 0; height: 42px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: 6px; outline: 0; color: var(--ink); background: var(--surface); font-size: 13px; transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease; }
input:hover, select:hover { border-color: var(--control-hover); }
input:focus, select:focus { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 14%, transparent); }
input::placeholder { color: var(--muted); }
select { padding-right: 30px; cursor: pointer; }

.date-control { display: flex; height: 42px; align-items: center; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 6px; background: var(--surface); transition: border-color .16s ease, box-shadow .16s ease; }
.date-control:focus-within { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 14%, transparent); }
.icon-button { display: grid; width: 38px; height: 38px; padding: 0; place-items: center; border: 0; border-radius: 6px; color: var(--ink-soft); background: transparent; transition: color .16s ease, background-color .16s ease; }
.icon-button:hover { color: var(--brand); background: var(--brand-soft); }
.icon-button svg { width: 17px; height: 17px; }
.date-picker-shell { position: relative; min-width: 0; height: 100%; flex: 1; }
.date-picker-shell input { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; padding: 0; border: 0; opacity: 0; cursor: pointer; font-size: 16px; touch-action: manipulation; }
.date-picker-button { display: flex; width: 100%; height: 100%; align-items: center; justify-content: center; gap: 8px; padding: 0 8px; border: 0; color: var(--ink); background: transparent; font-size: 13px; font-weight: 650; white-space: nowrap; transition: color .16s ease; }
.date-picker-shell:hover .date-picker-button { color: var(--brand); }
.date-picker-button svg { width: 16px; height: 16px; color: var(--brand); }
.today-button { height: 28px; margin-right: 6px; padding: 0 9px; border: 0; border-radius: 5px; color: var(--brand); background: var(--brand-soft); font-size: 11px; font-weight: 650; }

.period-field { grid-column: 1 / -1; }
.period-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.period-label { min-width: 108px; margin-bottom: 0; }
.period-presets { display: flex; align-items: center; gap: 5px; }
.period-presets > span { margin-right: 3px; color: var(--muted); font-size: 10px; }
.period-preset, .period-clear { height: 27px; padding: 0 9px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink-soft); background: var(--surface-subtle); font-size: 10px; transition: color .16s ease, border-color .16s ease, background-color .16s ease; }
.period-preset:hover, .period-clear:hover { border-color: var(--accent-border); color: var(--brand); }
.period-preset[aria-pressed="true"] { border-color: var(--selected-border); color: var(--brand-strong); background: var(--brand-soft); }
.period-clear { border-color: transparent; background: transparent; }
.period-picker { display: grid; grid-template-columns: repeat(13, minmax(0, 1fr)); gap: 6px; }
.period-option { height: 42px; display: flex; align-items: baseline; justify-content: center; gap: 2px; border: 1px solid var(--line-strong); border-radius: 6px; color: var(--ink-soft); background: var(--surface-subtle); transition: color .16s ease, border-color .16s ease, background-color .16s ease, box-shadow .16s ease; }
.period-option:hover { border-color: var(--accent-border); color: var(--brand); background: var(--brand-wash); }
.period-option:active { background: var(--brand-soft); }
.period-option strong { font-size: 14px; font-weight: 680; font-variant-numeric: tabular-nums; }
.period-option span { font-size: 9px; }
.period-option.selected { border-color: var(--brand); color: var(--on-brand); background: var(--brand); box-shadow: inset 0 -2px 0 rgb(0 0 0 / 12%); }

.secondary-filters { display: grid; grid-template-columns: 1.05fr 1.25fr .82fr auto; gap: 12px; align-items: end; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.search-control { position: relative; }
.search-control > svg { position: absolute; top: 13px; left: 12px; z-index: 1; width: 15px; height: 15px; color: var(--muted); pointer-events: none; }
.search-control input { padding-left: 34px; }
.secondary-filters input, .secondary-filters select { height: 40px; background: var(--surface-subtle); font-size: 12px; }
.reset-button { display: inline-flex; height: 40px; align-items: center; justify-content: center; gap: 6px; padding: 0 7px; border: 0; border-radius: 5px; color: var(--muted); background: transparent; font-size: 11px; white-space: nowrap; transition: color .16s ease, background-color .16s ease; }
.reset-button:hover { color: var(--brand); background: var(--brand-wash); }
.reset-button svg { width: 14px; height: 14px; }
.range-notice { margin-top: 14px; padding: 10px 12px; border-left: 3px solid var(--warning-line); color: var(--warning-ink); background: var(--warning-soft); font-size: 12px; line-height: 1.65; }

.results-section { min-height: 340px; padding-top: 32px; scroll-margin-top: 84px; }
.results-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 18px; }
.result-kicker { display: flex; align-items: center; gap: 9px; margin-bottom: 7px; color: var(--muted); font-size: 10px; font-weight: 650; }
.results-header h2 { display: flex; align-items: center; gap: 10px; font-size: 22px; line-height: 1.3; font-weight: 700; }
#result-count { white-space: nowrap; }
#result-count:not(:empty) { padding: 3px 8px; border: 1px solid var(--result-border); border-radius: 5px; color: var(--brand); background: var(--brand-wash); font-size: 11px; font-weight: 650; }
.results-header p { margin-top: 6px; color: var(--muted); font-size: 11px; }
.sort-label { display: inline-flex; min-height: 32px; align-items: center; gap: 6px; color: var(--muted); font-size: 11px; white-space: nowrap; }
.sort-label svg { width: 15px; height: 15px; }

.room-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.room-card { min-width: 0; padding: 18px 18px 0; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); transition: border-color .16s ease, box-shadow .16s ease; }
.room-card:hover { border-color: var(--accent-border); box-shadow: var(--shadow-low); }
.room-card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.campus-tag { color: var(--ink-soft); font-size: 11px; font-weight: 650; }
.available-tag { display: inline-flex; align-items: center; gap: 4px; color: var(--brand); font-size: 10px; white-space: nowrap; }
.available-tag svg { width: 12px; height: 12px; }
.room-card h3 { margin: 12px 0 4px; overflow-wrap: anywhere; font-size: 23px; line-height: 1.3; font-weight: 700; }
.location-line { display: flex; align-items: center; gap: 5px; color: var(--ink-soft); font-size: 11px; }
.location-line svg { width: 13px; height: 13px; color: var(--muted); }
.room-meta { min-height: 18px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 12px; color: var(--muted); font-size: 10px; }
.room-meta > span { display: inline-flex; align-items: center; gap: 4px; }
.room-meta svg { width: 13px; height: 13px; }
.room-meta .type-label { padding-left: 10px; border-left: 1px solid var(--line); }
.period-strip { display: grid; grid-template-columns: repeat(13, minmax(0, 1fr)); gap: 3px; margin-top: 16px; }
.period-cell { height: 22px; display: grid; place-items: center; border: 1px solid transparent; border-radius: 3px; color: var(--period-busy-text); background: var(--period-busy); font-size: 9px; line-height: 1; font-variant-numeric: tabular-nums; }
.period-cell.free { color: var(--period-free-text); background: var(--period-free); }
.period-cell.unknown { color: var(--warning); background: var(--warning-soft); }
.period-cell.selected { border-color: var(--brand); color: var(--on-brand); background: var(--brand); font-weight: 700; }
.strip-caption { min-height: 16px; display: flex; align-items: center; gap: 5px; margin-top: 8px; color: var(--brand); font-size: 10px; }
.strip-caption svg { width: 12px; height: 12px; }
.card-footer { min-height: 45px; display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.card-footer button { min-height: 42px; display: inline-flex; align-items: center; gap: 5px; padding: 0 0 0 10px; border: 0; color: var(--brand); background: transparent; font-size: 11px; font-weight: 650; }
.card-footer button:hover { color: var(--brand-strong); }
.card-footer button svg { width: 14px; height: 14px; transition: transform .16s ease; }
.card-footer button:hover svg { transform: translateX(2px); }

.state-panel { padding: 48px 20px; border: 1px solid var(--line); border-radius: 8px; text-align: center; background: var(--surface-subtle); }
.state-panel > svg { width: 30px; height: 30px; margin-bottom: 12px; color: var(--state-icon); }
.state-panel h3 { font-size: 15px; font-weight: 680; }
.state-panel p { max-width: 460px; margin: 8px auto 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.state-panel button { height: 38px; margin-top: 18px; padding: 0 18px; border: 0; border-radius: 6px; color: var(--on-brand); background: var(--brand); font-size: 12px; font-weight: 650; }
.state-panel button:hover { background: var(--brand-strong); }
.spinner { width: 24px; height: 24px; display: inline-block; margin-bottom: 14px; border: 2px solid var(--line); border-top-color: var(--brand); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.scroll-status { min-height: 48px; margin: 20px 0 0; padding: 14px; color: var(--muted); text-align: center; font-size: 11px; }

.data-note { display: grid; grid-template-columns: 20px minmax(0, 1fr); gap: 12px; margin-top: 34px; padding: 20px 0; border-top: 1px solid var(--line-strong); scroll-margin-top: 84px; }
.data-note > svg { width: 17px; height: 17px; margin-top: 1px; color: var(--muted); }
.data-note h2 { margin-bottom: 6px; color: var(--ink-soft); font-size: 12px; font-weight: 680; }
.data-note p { color: var(--muted); font-size: 11px; line-height: 1.75; }
.data-note .data-meta { margin-top: 5px; color: var(--ink-soft); }
.data-note .data-scope { margin-top: 2px; font-size: 10px; }
.site-footer { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.site-footer > span:first-child { color: var(--ink-soft); font-size: 13px; font-weight: 700; }
.back-to-top { position: fixed; right: max(20px, calc((100vw - 1180px) / 2)); bottom: 22px; z-index: 15; display: grid; width: 42px; height: 42px; padding: 0; place-items: center; border: 1px solid var(--line-strong); border-radius: 6px; color: var(--brand); background: var(--back-to-top-bg); box-shadow: var(--shadow-low); opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(8px); transition: color .16s ease, border-color .16s ease, background-color .16s ease, opacity .18s ease, transform .18s ease, visibility 0s linear .18s; }
.back-to-top[data-visible="true"] { opacity: 1; visibility: visible; pointer-events: auto; transform: none; transition-delay: 0s; }
.back-to-top:hover { border-color: var(--accent-border); color: var(--brand-strong); background: var(--brand-wash); }
.back-to-top svg { width: 18px; height: 18px; }

dialog { width: min(660px, calc(100% - 32px)); max-height: 86dvh; padding: 0; border: 1px solid var(--line-strong); border-radius: 8px; color: var(--ink); background: var(--surface); box-shadow: var(--dialog-shadow); }
dialog::backdrop { background: var(--dialog-backdrop); backdrop-filter: blur(2px); }
.dialog-head { position: sticky; top: 0; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 22px 17px; border-bottom: 1px solid var(--line); background: var(--surface); }
.dialog-head > div { min-width: 0; }
.dialog-eyebrow { margin-bottom: 5px; color: var(--brand); font-size: 10px; font-weight: 650; }
.dialog-head h2 { overflow-wrap: anywhere; font-size: 24px; line-height: 1.3; }
.dialog-head .icon-button { align-self: flex-start; background: var(--surface-subtle); }
.dialog-body { padding: 20px 22px 24px; }
.dialog-location { margin-bottom: 10px; color: var(--ink-soft); font-size: 12px; }
.detail-date { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 18px; padding: 12px 14px; border-left: 3px solid var(--brand); background: var(--brand-wash); font-size: 12px; }
.detail-date span:last-child { color: var(--brand); font-size: 11px; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; margin: 18px 0 12px; color: var(--muted); font-size: 11px; }
.legend > span { display: flex; align-items: center; gap: 6px; }
.legend i { width: 9px; height: 9px; display: block; border: 1px solid var(--accent-border); border-radius: 2px; background: var(--period-free); }
.legend i.busy { border-color: var(--line-strong); background: var(--period-busy); }
.legend i.unknown { border-color: var(--warning-line); background: var(--warning-soft); }
.detail-periods { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.detail-period { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 11px 3px; border: 1px solid transparent; border-radius: 6px; color: var(--period-busy-text); background: var(--period-busy); font-size: 10px; }
.detail-period strong { font-size: 11px; font-weight: 680; white-space: nowrap; }
.detail-period.free { color: var(--period-free-text); background: var(--period-free); }
.detail-period.unknown { color: var(--warning); background: var(--warning-soft); }
.detail-period.chosen { border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); }
.detail-caption { margin-top: 9px; color: var(--muted); font-size: 10px; }
.interval-heading { margin: 21px 0 10px; font-size: 12px; font-weight: 680; }
.interval-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.interval-tags > span { padding: 6px 9px; border: 1px solid var(--result-border); border-radius: 5px; color: var(--brand); background: var(--brand-wash); font-size: 11px; }
.detail-note { margin-top: 21px; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 1.75; }
.noscript { position: fixed; bottom: 16px; left: 16px; z-index: 30; padding: 14px; border-radius: 6px; background: var(--noscript-bg); }

@media (max-width: 980px) {
  .hero { grid-template-columns: minmax(0, 1fr) 440px; gap: 34px; }
  h1 { font-size: 36px; }
  .semester-status { grid-template-columns: 1fr 1.4fr; }
  .primary-filters { grid-template-columns: minmax(0, 1.2fr) minmax(200px, .8fr); }
  .secondary-filters { grid-template-columns: 1fr 1fr; }
  .reset-button { justify-self: end; }
  .room-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  html { scroll-behavior: auto; }
  .site-header { height: 58px; }
  .header-inner, .page, .site-footer { width: min(100% - 32px, 1180px); }
  .header-actions { gap: 6px; }
  .theme-switcher { grid-template-columns: repeat(3, 38px); gap: 1px; padding: 1px; }
  .theme-option { width: 38px; height: 38px; }
  .brand-mark { width: 31px; height: 31px; }
  .brand-mark svg { width: 20px; height: 20px; }
  .brand strong { font-size: 18px; }
  .brand-description { font-size: 10px; }
  .about-link span { display: none; }
  .about-link { width: 38px; justify-content: center; }
  .about-link svg { width: 18px; height: 18px; }

  .hero { min-height: 0; display: block; padding: 20px 0 18px; }
  .eyebrow { margin-bottom: 7px; font-size: 10px; }
  h1 { font-size: 31px; line-height: 1.2; }
  .semester-status { grid-template-columns: .9fr 1.35fr; gap: 11px 14px; margin-top: 18px; padding: 12px 0 10px; }
  .semester-heading { gap: 7px; }
  .semester-heading svg { width: 16px; height: 16px; }
  .semester-heading span { font-size: 9px; }
  .semester-heading strong { font-size: 10px; }
  .semester-stats > div { padding-left: 10px; }
  .semester-stats strong { font-size: 17px; }
  .semester-stats span { font-size: 8px; }
  .semester-range { display: none; }

  .query-panel { padding: 15px 14px 14px; border-radius: 8px; }
  .query-heading { margin-bottom: 14px; padding-bottom: 11px; }
  .section-heading h2 { font-size: 15px; }
  .section-heading > p { display: none; }
  .primary-filters { grid-template-columns: 1fr; gap: 14px; }
  .date-control { height: 44px; }
  .icon-button { width: 40px; height: 40px; }
  .date-picker-button { font-size: 13px; }
  .today-button { height: 30px; }

  .period-heading { align-items: center; }
  .period-presets > span { display: none; }
  .period-preset, .period-clear { height: 29px; padding: 0 7px; }
  .period-picker { grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 5px; }
  .period-option { height: 44px; }
  .period-option strong { font-size: 13px; }

  .secondary-filters { grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 15px; padding-top: 14px; }
  .search-field { grid-column: 1 / -1; grid-row: 1; }
  .reset-button { height: 34px; grid-column: 1 / -1; justify-self: end; }

  .results-section { padding-top: 25px; scroll-margin-top: 68px; }
  .results-header { align-items: flex-end; gap: 12px; margin-bottom: 15px; }
  .results-header h2 { font-size: 19px; }
  .results-header p { max-width: 230px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .sort-label { align-self: flex-end; font-size: 9px; }
  .sort-label svg { width: 13px; height: 13px; }
  .room-grid { grid-template-columns: 1fr; gap: 10px; }
  .room-card { padding: 16px 16px 0; }
  .room-card h3 { font-size: 22px; }
  .period-cell { height: 24px; font-size: 9px; }
  .state-panel { padding: 36px 16px; }

  .data-note { margin-top: 28px; padding-top: 17px; }
  .site-footer { min-height: 80px; flex-direction: column; align-items: flex-start; justify-content: center; gap: 7px; }
  .back-to-top { right: 16px; bottom: calc(16px + env(safe-area-inset-bottom)); width: 44px; height: 44px; }
  .dialog-head, .dialog-body { padding-left: 18px; padding-right: 18px; }
  .detail-periods { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 360px) {
  .header-inner, .page, .site-footer { width: min(100% - 24px, 1180px); }
  .brand-description { display: none; }
  h1 { font-size: 28px; }
  .semester-status { grid-template-columns: 1fr; }
  .semester-heading { display: none; }
  .period-heading { align-items: flex-start; }
  .period-presets { display: grid; grid-template-columns: repeat(4, auto); gap: 4px; }
  .period-preset, .period-clear { padding: 0 6px; }
  .period-picker { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .results-header { flex-direction: column; align-items: stretch; }
  .sort-label { align-self: flex-start; }
  .dialog-head, .dialog-body { padding-left: 15px; padding-right: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}