:root {
  --ink: #172a3a;
  --muted: #536875;
  --paper: #edf3f3;
  --card: rgba(255, 255, 255, 0.88);
  --line: rgba(23, 42, 58, 0.12);
  --accent: #087f78;
  --accent-2: #a8422a;
  --shadow: 0 16px 40px rgba(23, 42, 58, 0.1);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  color: var(--ink);
  background: #e5eeee;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 520px at 8% -15%, rgba(99, 196, 186, 0.3), transparent 60%),
    radial-gradient(700px 480px at 100% 6%, rgba(242, 157, 126, 0.26), transparent 58%),
    linear-gradient(180deg, #f5f9f8 0%, #e5eeee 60%, #dce8e9 100%);
}

.top, .controls, .stats, .view-controls, main, footer {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 34px 0 22px;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand h1 { margin: 0; font-size: 1.6rem; letter-spacing: -0.04em; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 0.85rem; }
.mark {
  width: 54px; height: 54px; border-radius: 8px;
  display: grid; place-items: center;
  background: var(--ink); color: #a9e8de; font-weight: 700;
  box-shadow: var(--shadow);
  letter-spacing: 0.04em;
}

.top-actions { display: flex; gap: 10px; }
.upload, #reload, #print, .settings-link, .back-link {
  border: 0; border-radius: 7px; padding: 10px 16px;
  font: inherit; font-weight: 600; cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.upload { background: var(--accent-2); color: #fff; }
#reload { background: var(--accent); color: #fff; }
#print { background: rgba(255, 255, 255, 0.72); color: var(--ink); border: 1px solid var(--line); }
.settings-link, .back-link { background: var(--ink); color: #a9e8de; text-decoration: none; }
.upload:hover, #reload:hover, #print:hover, .settings-link:hover, .back-link:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(23, 42, 58, 0.12); }

.pull-refresh {
  position: fixed;
  z-index: 5;
  top: 0;
  left: 50%;
  margin: 0;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 0 0 8px 8px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--muted);
  font-size: 0.76rem;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-100% + var(--pull-distance, 0px)));
  transition: opacity 120ms ease, transform 120ms ease;
}
.pull-refresh.visible { opacity: 1; }
.pull-refresh.ready { color: var(--accent); font-weight: 700; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.stat::after { content: ""; position: absolute; inset: auto 0 0; height: 3px; background: var(--accent); }
.stat:nth-child(2)::after { background: var(--accent-2); }
.stat:nth-child(3)::after { background: #2b72b8; }
.stat:nth-child(4)::after { background: #d29a2e; }
.stat b { display: block; font-size: 1.5rem; letter-spacing: -0.04em; }
.stat span { color: var(--muted); font-size: 0.8rem; }

.flash {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: #dff3ea;
  color: #0f6e62;
}
.flash.error { background: #fde7df; color: #9a3412; }

.controls {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.modes { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.modes button {
  border: 1px solid var(--line);
  background: #f4f7f7;
  border-radius: 6px;
  padding: 8px 13px;
  font: inherit;
  cursor: pointer;
  color: var(--muted);
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}
.modes button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.modes button:hover:not(.active) { border-color: var(--accent); color: var(--accent); }
.view-controls {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  margin: 10px auto 0;
  padding: 0 2px;
}
.view-switch, .day-list { display: flex; align-items: center; gap: 6px; }
.day-list { flex-wrap: wrap; }
.view-switch button, .day-list button {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  padding: 8px 13px;
  font: inherit;
  cursor: pointer;
  color: var(--muted);
}
.view-switch button.active, .day-list button.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.view-switch button:hover:not(.active), .day-list button:hover:not(.active) { border-color: var(--ink); color: var(--ink); }
.day-buttons { display: flex; align-items: center; gap: 8px; }
.day-label { color: var(--muted); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; }
.day-list button { min-width: 42px; padding-inline: 9px; }
.notifications {
  width: min(1240px, calc(100% - 32px));
  margin: 12px auto 0;
  padding: 16px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.notification-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.eyebrow { display: block; margin-bottom: 4px; color: var(--accent); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.notification-heading h2 { margin: 0; font-size: 1rem; }
.notification-heading p, .notification-status { margin: 4px 0 0; color: var(--muted); font-size: 0.78rem; }
.notification-action { border: 1px solid var(--accent); border-radius: 6px; padding: 8px 12px; background: transparent; color: var(--accent); font: inherit; font-size: 0.8rem; font-weight: 600; cursor: pointer; }
.notification-action:hover { background: var(--accent); color: #fff; }
.notification-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 14px; }
.notification-option { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; background: rgba(255, 255, 255, 0.62); }
.toggle-line { display: flex; align-items: center; gap: 8px; margin: 0; color: var(--ink); font-size: 0.82rem; }
.toggle-line input { width: auto; accent-color: var(--accent); }
.notification-option input[type="time"] { width: auto; padding: 7px 8px; }
.notification-status { margin-top: 10px; }
.settings-page { display: grid; gap: 12px; }
.settings-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.settings-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.settings-heading h2 { margin: 0; font-size: 1.05rem; }
.settings-description { margin: 4px 0 0; color: var(--muted); font-size: 0.8rem; }
.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 18px; }
.settings-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.settings-actions button { border: 0; border-radius: 6px; padding: 10px 14px; font: inherit; font-weight: 600; cursor: pointer; }
.reset-button { background: rgba(255, 255, 255, 0.78); border: 1px solid var(--line) !important; color: var(--muted); }
.save-button { background: var(--accent); color: #fff; }
.saved-message { margin: 0; color: var(--accent); font-size: 0.8rem; }
.filters {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1.4fr;
  gap: 10px;
}
label span { display: block; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
select, input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
  background: #fbfdfd;
  color: var(--ink);
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
select:focus, input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(8, 127, 120, 0.13); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 10px;
  order: -1;
}
.chip {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

main { display: flex; flex-direction: column; }

.site-intro {
  margin: 0 0 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.55);
}
.site-intro h2 {
  margin: 0 0 6px;
  font-size: 1rem;
  letter-spacing: -0.02em;
}
.site-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.board {
  overflow: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-height: 280px;
}
.session-board + .session-board { border-top: 1px solid var(--line); }
.session-title {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px 10px;
  background: rgba(255, 255, 255, 0.5);
}
.session-title span { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }
.session-board:nth-child(2) .session-title span { background: var(--accent-2); }
.session-title h2 { margin: 0; font-size: 0.95rem; letter-spacing: -0.01em; }
.session-title p { margin: 2px 0 0; color: var(--muted); font-size: 0.72rem; }
.empty { padding: 64px 20px; text-align: center; color: var(--muted); }

table.grid {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 880px;
  table-layout: fixed;
}
.grid th, .grid td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  vertical-align: top;
  padding: 10px;
}
.grid th {
  background: #eaf3f3;
  color: #355262;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: left;
  position: sticky;
  top: 0;
  z-index: 1;
}
.grid th:first-child, .grid td:first-child {
  position: sticky;
  left: 0;
  background: #eaf3f3;
  font-weight: 600;
  white-space: nowrap;
  z-index: 2;
  width: 122px;
}
.grid th:not(:first-child), .grid td:not(:first-child) { width: 156px; }
.grid td { background: rgba(255,255,255,0.55); height: 128px; }
.grid td:first-child strong { display: block; }
.grid td:first-child small { display: block; margin-top: 3px; color: var(--muted); font-size: 0.7rem; font-weight: 500; }

.lesson {
  border-radius: 6px;
  padding: 10px 10px 10px 12px;
  margin-bottom: 6px;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  color: #15332e;
  background: color-mix(in srgb, var(--c, #0f6e62) 16%, white);
  border: 1px solid color-mix(in srgb, var(--c, #0f6e62) 35%, white);
  border-left: 4px solid var(--c, var(--accent));
  transition: transform 140ms ease, box-shadow 140ms ease;
}
.day-grid th:not(:first-child), .day-grid td:not(:first-child) {
  width: 33.333%;
  min-width: 0;
}
.day-grid td {
  min-height: 112px;
}
.empty-cell {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  padding: 10px 0;
}
.lesson:hover { transform: translateY(-2px); box-shadow: 0 6px 14px rgba(23, 42, 58, 0.1); }
.lesson h3 { margin: 0 0 5px; font-size: 0.9rem; letter-spacing: -0.015em; }
.lesson p { margin: 0; font-size: 0.75rem; color: #3d524d; line-height: 1.4; }
.lesson .tag { margin-top: auto; align-self: flex-start; }
.tag {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(255,255,255,0.7);
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0 40px;
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.01em;
}

.footer-stats {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.online, .views { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.online i { width: 7px; height: 7px; border-radius: 50%; background: #16805f; box-shadow: 0 0 0 3px rgba(22, 128, 95, 0.12); }
.online b, .views b { color: var(--ink); }

@media (max-width: 800px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .filters, .notification-options { grid-template-columns: 1fr; }
  .top { flex-direction: column; align-items: flex-start; padding-top: 24px; }
  .top-actions { width: 100%; }
  .top-actions > * { flex: 1; text-align: center; }
  .notification-heading { flex-direction: column; }
  .notification-action { width: 100%; }
  .settings-grid { grid-template-columns: 1fr; }
  .settings-actions { align-items: stretch; flex-direction: column-reverse; }
  footer { align-items: flex-start; flex-direction: column; }
  .view-controls { align-items: stretch; flex-direction: column; gap: 8px; }
  .view-switch, .day-buttons { width: 100%; }
  .view-switch button { flex: 1; }
  .day-buttons { align-items: center; }
  .day-list { flex: 1; flex-wrap: wrap; gap: 4px; }
  .day-list button { flex: 1 1 15%; min-width: 0; padding: 8px 3px; }

  table.grid {
    min-width: 0;
    table-layout: auto;
  }
  .grid th:first-child, .grid td:first-child {
    width: 64px;
    min-width: 64px;
    max-width: 64px;
  }
  .grid th:not(:first-child), .grid td:not(:first-child) {
    min-width: 0;
    width: auto;
  }
  .day-grid th:not(:first-child), .day-grid td:not(:first-child) {
    width: 34%;
    min-width: 0;
  }
  .day-grid td {
    min-height: 90px;
  }
  .grid td {
    height: auto;
    min-height: 84px;
  }
  .lesson {
    min-height: 72px;
    padding: 8px 8px 8px 10px;
  }
  .lesson h3 { font-size: 0.8rem; }
  .lesson p { font-size: 0.69rem; }
}

@media print {
  .top, .top-actions, .controls, .stats, footer, .bg, .legend, .site-intro { display: none !important; }
  .session-title > div > p { display: none !important; }
  .lesson > p:last-of-type { display: none !important; }
  body { background: #fff; }
  main { width: 100%; margin: 0; padding: 0; }
  .board { box-shadow: none; border: 0; width: 100%; margin: 0; padding: 0; }
}