/* Пары — расписание КНИТУ
   Лёгкий интерфейс: системные шрифты, без картинок и фреймворков. */

:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --surface-2: #f1efe9;
  --ink: #15171c;
  --muted: #666b76;
  --line: #e6e2d9;
  --accent: #2f5fe0;
  --accent-ink: #ffffff;
  --accent-soft: #e9efff;
  --amber: #9a3412;
  --amber-soft: #fdf0d5;
  --green: #0b7a55;
  --green-soft: #dff3ea;
  --violet: #6d28d9;
  --violet-soft: #efe9fd;
  --slate: #475569;
  --slate-soft: #eceff3;
  --red: #c0362c;
  --shadow: 0 1px 2px rgba(23, 24, 30, .04), 0 6px 18px -12px rgba(23, 24, 30, .18);
  --radius: 18px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1014;
    --surface: #161920;
    --surface-2: #1d2129;
    --ink: #ecedf2;
    --muted: #9aa1b0;
    --line: #262b36;
    --accent: #8ba1ff;
    --accent-ink: #0c1020;
    --accent-soft: #1b2340;
    --amber: #fbbf24;
    --amber-soft: #2a2211;
    --green: #4ade80;
    --green-soft: #12291f;
    --violet: #c4b5fd;
    --violet-soft: #241c3d;
    --slate: #cbd5e1;
    --slate-soft: #1e242e;
    --red: #f87171;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 24px -16px rgba(0, 0, 0, .6);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body { -webkit-tap-highlight-color: transparent; }

button, a { touch-action: manipulation; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button { font: inherit; color: inherit; }

.app {
  display: flex;
  flex-direction: column;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px calc(28px + env(safe-area-inset-bottom));
  min-height: 100vh;
  min-height: 100dvh;
}

/* ── Шапка ─────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: calc(10px + env(safe-area-inset-top, 0px)) 0 10px;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
}

.topbar.is-scrolled { border-bottom-color: var(--line); }

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 1;
  min-width: 0;
  padding: 5px 8px 5px 5px;
  margin-left: -5px;
  background: none;
  border: 0;
  border-radius: 14px;
  cursor: pointer;
  text-align: left;
  transition: background .15s ease;
}

.brand:hover, .brand:focus-visible { background: var(--surface-2); }

.brand-mark {
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.03em;
}

.brand-text { min-width: 0; display: flex; flex-direction: column; gap: 1px; }

.brand-name {
  font-weight: 650;
  font-size: 15.5px;
  letter-spacing: -.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-chev { flex: none; width: 18px; height: 18px; fill: none; stroke: var(--muted); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.share {
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}

.share svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.share:hover { border-color: var(--accent); }
.share:hover svg { stroke: var(--accent); }

.today {
  flex: none;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .12s ease, border-color .15s ease;
}

.today:hover { border-color: var(--accent); color: var(--accent); }
.today:active { transform: scale(.97); }

/* ── Неделя ────────────────────────────────────────────── */

.weekbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 0 2px;
}

.arrow {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 12px;
  background: none;
  cursor: pointer;
  transition: background .15s ease;
}

.arrow svg { width: 20px; height: 20px; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.arrow:hover { background: var(--surface-2); }

.week-label { text-align: center; display: flex; flex-direction: column; gap: 1px; }

.week-dates { font-weight: 650; font-size: 15px; letter-spacing: -.01em; }
.week-parity { font-size: 12px; color: var(--muted); }

/* ── Дни ───────────────────────────────────────────────── */

.days {
  display: flex;
  gap: 4px;
  padding: 12px 0 14px;
  overflow-x: auto;
  scrollbar-width: none;
  scroll-behavior: smooth;
}

.days::-webkit-scrollbar { display: none; }

.day {
  flex: 1 1 0;
  min-width: 38px;
  padding: 7px 4px 8px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  transition: background .15s ease, border-color .15s ease, transform .12s ease;
}

.day .dow { font-size: 10.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.day .num { font-size: 17px; font-weight: 650; letter-spacing: -.02em; }
.day .dot { width: 4px; height: 4px; border-radius: 50%; background: currentColor; opacity: 0; margin-top: 2px; }
.day.has .dot { opacity: .45; }
.day:hover { background: var(--surface-2); }

.day.is-today .num { color: var(--accent); }

.day.is-active {
  background: var(--surface);
  border-color: var(--line);
  box-shadow: var(--shadow);
}

.day.is-active .dow { color: var(--accent); }
.day.is-active .dot { background: var(--accent); opacity: 1; }

/* ── Занятия ───────────────────────────────────────────── */

.content { display: flex; flex-direction: column; gap: 10px; min-height: 240px; }

.lesson {
  position: relative;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 13px;
  padding: 13px 15px 13px 15px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: rise .22s ease both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.lesson::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--type-color, var(--slate));
}

.lesson .time { text-align: right; padding-top: 1px; }
.lesson .start { font-size: 14px; font-weight: 650; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.lesson .end { font-size: 11.5px; color: var(--muted); font-variant-numeric: tabular-nums; }

.lesson .body { min-width: 0; }

.lesson .subject {
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -.012em;
  overflow-wrap: anywhere;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--muted);
}

.room {
  padding: 1.5px 7px;
  border-radius: 7px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-weight: 600;
  font-size: 12px;
  color: var(--ink);
  white-space: nowrap;
}

.teacher { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.type {
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .05em;
  padding: 2px 7px;
  border-radius: 6px;
  color: var(--type-color, var(--slate));
  background: var(--type-bg, var(--slate-soft));
  white-space: nowrap;
}

.sub {
  font-size: 10px;
  font-weight: 650;
  letter-spacing: .02em;
  padding: 2px 6px;
  border-radius: 6px;
  color: var(--muted);
  border: 1px dashed var(--line);
  white-space: nowrap;
}

.lesson.is-now {
  border-color: color-mix(in srgb, var(--amber) 45%, var(--line));
  background: linear-gradient(0deg, var(--amber-soft), var(--amber-soft));
}

.lesson.is-now::before { background: var(--amber); }

.now-badge {
  position: absolute;
  top: -8px;
  right: 12px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--amber);
  color: #1b1300;
  font-size: 10.5px;
  font-weight: 750;
  letter-spacing: .02em;
}

@media (prefers-color-scheme: dark) {
  .now-badge { color: #221a05; }
}

.now-badge i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  animation: blink 1.6s infinite;
}

@keyframes blink { 50% { opacity: .25; } }

.lesson.is-past { opacity: .58; }
.lesson.is-past::before { background: var(--line); }

/* ── Пустое состояние ─────────────────────────────────── */

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  padding: 52px 20px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  animation: rise .22s ease both;
}

.empty .emoji { font-size: 34px; line-height: 1; filter: grayscale(.15); }
.empty .title { color: var(--ink); font-weight: 600; font-size: 15px; }
.empty .hint { font-size: 13px; max-width: 260px; }

/* ── Скелетон ─────────────────────────────────────────── */

.skeleton {
  height: 86px;
  border-radius: var(--radius);
  background: linear-gradient(100deg, var(--surface) 30%, var(--surface-2) 50%, var(--surface) 70%);
  background-size: 220% 100%;
  border: 1px solid var(--line);
  animation: shimmer 1.3s infinite linear;
}

@keyframes shimmer { to { background-position: -220% 0; } }

/* ── Подвал ────────────────────────────────────────────── */

.foot {
  margin-top: auto;
  padding-top: 26px;
  text-align: center;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
}

.foot a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }

/* ── Выбор группы ──────────────────────────────────────── */

.sheet { position: fixed; inset: 0; z-index: 75; }

.sheet[hidden] { display: none; }

.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 18, .42);
  animation: fade .2s ease both;
}

@keyframes fade { from { opacity: 0; } }

.sheet-panel {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: min(640px, 100%);
  max-height: 88dvh;
  display: flex;
  flex-direction: column;
  padding: 6px 16px calc(16px + env(safe-area-inset-bottom));
  background: var(--surface);
  border-radius: 24px 24px 0 0;
  box-shadow: 0 -10px 40px -12px rgba(0, 0, 0, .3);
  overflow: hidden;
  animation: slideup .26s cubic-bezier(.22, .8, .3, 1) both;
}

@keyframes slideup { from { transform: translate(-50%, 14px); opacity: .5; } }

.sheet-grip { width: 36px; height: 4px; border-radius: 2px; background: var(--line); margin: 6px auto 6px; }

.sheet-head { flex: none; display: flex; align-items: center; justify-content: space-between; padding: 2px 0 10px; }
.sheet-head h2 { margin: 0; font-size: 18px; letter-spacing: -.02em; }

.icon-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 0; border-radius: 10px; background: var(--surface-2); cursor: pointer;
}
.icon-btn svg { width: 16px; height: 16px; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; }

.search { flex: none; position: relative; }

.search svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 17px; height: 17px; fill: none; stroke: var(--muted); stroke-width: 2; stroke-linecap: round;
}

.search input {
  width: 100%;
  padding: 12px 12px 12px 38px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface-2);
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  outline: none;
}

.search input:focus { border-color: var(--accent); background: var(--surface); }

.chips {
  flex: none;
  position: relative;
  z-index: 2;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 10px 0 6px;
  scrollbar-width: none;
  background: var(--surface);
}
.chips::-webkit-scrollbar { display: none; }

.chip {
  flex: none;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: none;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s ease, border-color .15s ease;
}

.chip:hover { border-color: var(--muted); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

.sheet-list { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 2px 0 8px; background: var(--surface); }
.sheet-list, .days { -webkit-overflow-scrolling: touch; }
.sheet-list::-webkit-scrollbar { width: 6px; }
.sheet-list::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }

.course-title {
  padding: 10px 4px 6px;
  background: var(--surface);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
}

.group-row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
  border: 0;
  border-radius: 12px;
  background: none;
  cursor: pointer;
  text-align: left;
}

.group-row:hover, .group-row:focus-visible { background: var(--surface-2); }
.group-row.is-current { background: var(--accent-soft); }
.group-row.is-current .g-name { color: var(--accent); }
.group-row .g-name { font-weight: 600; font-size: 14.5px; }
.group-row .g-sub { margin-left: auto; font-size: 11.5px; color: var(--muted); white-space: nowrap; }

.group-row .g-badge {
  font-size: 10px; font-weight: 700; letter-spacing: .03em;
  padding: 2px 6px; border-radius: 6px; background: var(--surface-2); color: var(--muted);
}

/* ── Подсказка в выборе группы ─────────────────────────── */

.pick-hint {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 38px 18px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.pick-hint b { color: var(--ink); font-size: 14.5px; font-weight: 600; }

/* ── Правовые страницы ─────────────────────────────────── */

.doc { padding-top: 18px; }

.doc .back {
  display: inline-block;
  margin: 8px 0;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}

.doc .back:hover { color: var(--accent); }

.doc h1 { font-size: 26px; line-height: 1.2; letter-spacing: -.02em; margin: 4px 0 6px; }
.doc h2 { font-size: 17px; letter-spacing: -.01em; margin: 26px 0 8px; }
.doc p, .doc li { font-size: 14.5px; line-height: 1.62; color: var(--ink); }
.doc p { margin: 0 0 10px; }
.doc ul { margin: 0 0 12px; padding-left: 20px; }
.doc li { margin-bottom: 5px; }
.doc a { color: var(--accent); }

.doc code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-2);
  font-size: 12.5px;
}

.doc .muted { color: var(--muted); font-size: 12.5px; }

.foot-legal { display: inline-block; margin-top: 3px; font-size: 11px; }

/* ── Установка на телефон ──────────────────────────────── */

.install {
  position: fixed;
  left: 50%;
  bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 0);
  z-index: 70;
  width: min(430px, calc(100% - 24px));
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 34px -14px rgba(0, 0, 0, .45);
  animation: install-in .25s ease both;
}

@keyframes install-in {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.install-ico {
  flex: none;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}

.install-ico svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

.install-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1px; line-height: 1.3; }
.install-text b { font-size: 12.8px; font-weight: 650; }
.install-text span { font-size: 11.5px; color: var(--muted); }

.install-btn {
  flex: none;
  padding: 8px 12px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 12.5px;
  font-weight: 650;
  cursor: pointer;
}

.install-close {
  flex: none;
  width: 26px;
  height: 26px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
}

.install-close:hover { background: var(--surface-2); }

/* ── Тост ──────────────────────────────────────────────── */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(86px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 8px);
  z-index: 80;
  padding: 9px 14px;
  border-radius: 999px;
  background: #1b1e26;
  color: #fff;
  font-size: 12.5px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}

.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ── Прочее ────────────────────────────────────────────── */

[hidden] { display: none !important; }

.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;
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.welcome {
  padding: 34px 22px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: rise .25s ease both;
}

.welcome .big { font-size: 40px; line-height: 1; }
.welcome h2 { margin: 10px 0 4px; font-size: 19px; letter-spacing: -.02em; }
.welcome p { margin: 0 auto 16px; max-width: 320px; color: var(--muted); font-size: 13.5px; }

.btn-primary {
  padding: 11px 18px;
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 650;
  font-size: 14px;
  cursor: pointer;
  transition: transform .12s ease, filter .15s ease;
}

.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:active { transform: scale(.98); }

.offline-note {
  margin: 0 0 10px;
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 12px;
  font-weight: 600;
}

@media (min-width: 560px) {
  .day { flex: 1; }
  .lesson { grid-template-columns: 64px 1fr; }
}

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