:root {
  --bg: #f8fced;
  --bg-accent: #eef7d3;
  --surface: #ffffff;
  --surface-soft: #f4fadb;
  --text: #203013;
  --text-muted: #50603f;
  --line: #d8e7a9;
  --lime: #84cc16;
  --lime-strong: #65a30d;
  --gold: #c79a24;
  --gold-soft: #f3e3b3;
  --danger-bg: #fff1f1;
  --danger-line: #f0b6b6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Verdana, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 15% -10%, #f6f7bf 0%, transparent 55%),
    linear-gradient(180deg, var(--bg-accent) 0%, var(--bg) 42%, #fbfdf3 100%);
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 20px 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(6px);
  background: color-mix(in oklab, var(--surface) 84%, transparent);
  border-bottom: 1px solid var(--line);
}

.topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
}

.brand {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.2px;
  color: var(--lime-strong);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0 8px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover {
  color: var(--text);
  background: var(--surface-soft);
  border-color: var(--line);
}

.nav-link.active {
  color: #17210e;
  background: linear-gradient(180deg, #d4ee90 0%, #bfe36f 100%);
  border-color: #abd45a;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.42);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 10px 28px rgba(106, 128, 41, 0.12);
}

.form {
  display: grid;
  gap: 14px;
  margin-top: 12px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--text-muted);
  font-size: 14px;
}

input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fcfeef;
  color: var(--text);
  outline: none;
}

input:focus {
  border-color: var(--lime);
  box-shadow: 0 0 0 3px rgba(132, 204, 22, 0.2);
}

.btn {
  border: 1px solid #b8d57b;
  background: linear-gradient(180deg, #f3f8d6 0%, #e8f2bc 100%);
  color: var(--text);
  padding: 9px 13px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}

.btn:hover {
  border-color: #a8cb63;
  background: linear-gradient(180deg, #eefaab 0%, #deef95 100%);
}

.btn.primary {
  background: linear-gradient(180deg, #abdf4f 0%, #8fcc22 100%);
  border-color: #7db91d;
  color: #102006;
}

.btn.primary:hover {
  background: linear-gradient(180deg, #9bd839 0%, #83bf1d 100%);
}

.alert {
  background: var(--danger-bg);
  border: 1px solid var(--danger-line);
  color: #8c1f1f;
  padding: 10px 12px;
  border-radius: 10px;
  margin: 10px 0;
}

.hint {
  color: var(--text-muted);
  font-size: 13px;
  margin: 0;
}

.grid,
.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fce8 100%);
}

.link-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.link-list a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  word-break: break-word;
}

.link-list a:hover {
  color: #1f3a0d;
  border-bottom-color: var(--gold);
}

.btn-link {
  display: inline-block;
  color: #273a16;
  text-decoration: none;
  border: 1px solid #d9c47a;
  background: linear-gradient(180deg, #fff1c8 0%, #f8e3a4 100%);
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 600;
}

.video-layout {
  display: grid;
  grid-template-columns: minmax(250px, 340px) minmax(0, 1fr);
  gap: 16px;
  margin-top: 12px;
}

.video-list-col {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, #ffffff 0%, #f7fce4 100%);
}

.video-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  max-height: 60vh;
  overflow: auto;
}

.video-list li + li { margin-top: 8px; }

.video-item {
  width: 100%;
  text-align: left;
  border: 1px solid #d6e6a4;
  background: #f9fce9;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
}

.video-item:hover {
  border-color: #c8dc87;
  background: #f0f8cb;
}

.video-item.active {
  background: linear-gradient(180deg, #fef2bf 0%, #f5df90 100%);
  border-color: #ddbf67;
}

.video-player-col {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fce8 100%);
}

#video-player {
  width: 100%;
  height: auto;
  max-height: 70vh;
  background: #111;
  border-radius: 12px;
}

@media (max-width: 980px) {
  .container { width: min(100%, calc(100% - 24px)); }
  .video-layout { grid-template-columns: 1fr; }
  .video-list { max-height: 34vh; }
}

@media (max-width: 760px) {
  .topbar .container {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    margin: 0;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: thin;
  }

  .grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .card {
    border-radius: 14px;
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .container { width: min(100%, calc(100% - 16px)); }
  .brand { font-size: 1rem; }
  .nav-link { padding: 7px 10px; font-size: 14px; }
  .video-item { padding: 9px 10px; }
}