:root {
  color-scheme: dark;
  --bg: #07111e;
  --bg-2: #0e1f33;
  --panel: rgba(10, 24, 42, 0.84);
  --panel-strong: rgba(8, 18, 31, 0.96);
  --line: rgba(160, 215, 255, 0.18);
  --line-strong: rgba(160, 215, 255, 0.34);
  --text: #ecf5ff;
  --muted: #9eb7cf;
  --accent: #9be7ff;
  --accent-2: #ffc778;
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.35);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --font-ui: "Trebuchet MS", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-display: "Georgia", "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(95, 170, 255, 0.2), transparent 30%),
    radial-gradient(circle at top right, rgba(255, 190, 120, 0.14), transparent 26%),
    linear-gradient(180deg, #09111b 0%, #07111e 35%, #091b2d 100%);
  color: var(--text);
  font-family: var(--font-ui);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.8) 0 1px, transparent 1.5px),
    radial-gradient(circle, rgba(255, 255, 255, 0.6) 0 1px, transparent 1.5px),
    linear-gradient(rgba(155, 231, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 231, 255, 0.04) 1px, transparent 1px);
  background-size: 180px 180px, 260px 260px, 48px 48px, 48px 48px;
  background-position: 0 0, 90px 60px, 0 0, 0 0;
  opacity: 0.32;
}

.app-shell {
  position: relative;
  max-width: 1600px;
  margin: 0 auto;
  padding: 32px 24px var(--dock-offset, 260px);
}

.hero,
.control-bar,
.tree-card,
.info-dock {
  backdrop-filter: blur(16px);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.78rem;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 3.4rem);
  line-height: 1.05;
}

.hero-subtitle {
  margin: 12px 0 0;
  max-width: 70ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.hero-stats {
  display: grid;
  gap: 12px;
  min-width: 220px;
}

.stat-card {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    rgba(5, 11, 20, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-label {
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.stat-value {
  font-size: 2.2rem;
  color: var(--accent-2);
}

.control-bar {
  display: grid;
  grid-template-columns: auto minmax(280px, 1fr) auto;
  gap: 20px;
  align-items: start;
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  margin-bottom: 24px;
}

.control-group {
  display: grid;
  gap: 10px;
}

.control-label {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.segmented-control {
  display: inline-flex;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  padding: 4px;
  background: rgba(0, 0, 0, 0.18);
}

.segment,
.action-button,
.background-select,
.skill-select {
  font: inherit;
}

.segment {
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: 180ms ease;
}

.segment.is-active {
  background: linear-gradient(135deg, rgba(155, 231, 255, 0.22), rgba(255, 199, 120, 0.24));
  color: var(--text);
}

.background-select,
.skill-select {
  appearance: none;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(5, 12, 22, 0.74);
  color: var(--text);
}

.background-summary {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  min-height: 2.8em;
}

.action-group {
  align-self: end;
  display: grid;
  gap: 12px;
  justify-items: end;
}

.load-action-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.download-action-wrap {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.action-button {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px 20px;
  color: var(--text);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.action-button:hover,
.segment:hover,
.skill-select:hover,
.background-select:hover {
  transform: translateY(-1px);
}

.action-button.primary {
  background: linear-gradient(135deg, rgba(89, 168, 255, 0.26), rgba(91, 232, 255, 0.24));
  border-color: rgba(155, 231, 255, 0.32);
}

.action-button.secondary {
  background: linear-gradient(135deg, rgba(255, 145, 110, 0.2), rgba(255, 202, 140, 0.18));
  border-color: rgba(255, 199, 120, 0.26);
}

.action-button.tertiary {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(155, 231, 255, 0.12));
  border-color: rgba(255, 255, 255, 0.16);
}

.action-note {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
  white-space: nowrap;
}

.tree-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.tree-card {
  border-radius: var(--radius-lg);
  overflow-x: auto;
  overflow-y: hidden;
  position: relative;
}

.tree-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--tree-color), transparent);
}

.tree-header {
  padding: 24px 24px 14px;
  border-bottom: 1px solid var(--line);
}

.tree-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.7rem;
}

.tree-meta {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.tier-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(260px, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.04);
  min-width: 1080px;
}

.tier-column {
  min-width: 0;
  background: rgba(3, 9, 18, 0.72);
}

.tier-column.is-locked {
  background: rgba(3, 9, 18, 0.54);
}

.tier-column.is-locked .tier-label {
  color: rgba(236, 245, 255, 0.55);
  background: rgba(255, 255, 255, 0.03);
}

.tier-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.tier-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.skill-list {
  display: grid;
}

.skill-row {
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 180ms ease, transform 180ms ease;
}

.skill-row:hover,
.skill-row:focus-within {
  background: rgba(155, 231, 255, 0.08);
}

.skill-row.is-locked {
  background: rgba(255, 255, 255, 0.03);
}

.skill-row.is-locked .skill-name {
  color: rgba(158, 183, 207, 0.62);
}

.skill-row.is-locked .badge.effective {
  color: rgba(198, 244, 255, 0.55);
  border-color: rgba(155, 231, 255, 0.12);
  background: rgba(155, 231, 255, 0.07);
}

.skill-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.skill-main {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.skill-name {
  font-size: 0.98rem;
  line-height: 1.3;
  min-width: 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge.bonus {
  background: rgba(255, 199, 120, 0.18);
  color: #ffe0af;
  border: 1px solid rgba(255, 199, 120, 0.3);
}

.badge.effective {
  background: rgba(155, 231, 255, 0.14);
  color: #c6f4ff;
  border: 1px solid rgba(155, 231, 255, 0.28);
}

.skill-rank-select {
  width: 74px;
  flex: 0 0 auto;
  text-align: center;
}

.skill-rank-select:disabled {
  cursor: not-allowed;
  color: rgba(158, 183, 207, 0.55);
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}

.info-dock {
  position: fixed;
  left: max(24px, env(safe-area-inset-left));
  right: max(24px, env(safe-area-inset-right));
  bottom: max(24px, env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  background: var(--panel-strong);
}

.info-label,
.status-label {
  margin: 0 0 6px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
}

.info-title,
.status-message {
  margin: 0;
}

.info-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.info-text {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.info-ranks {
  display: grid;
  gap: 4px;
  margin-top: 10px;
}

.rank-line {
  color: var(--text);
  line-height: 1.45;
}

.rank-label {
  color: var(--accent);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  margin-right: 6px;
}

.rank-effect {
  color: var(--muted);
}

.info-status {
  min-width: 280px;
}

.status-message {
  color: var(--accent-2);
  line-height: 1.5;
}

@media (max-width: 1180px) {
  .tier-grid {
    min-width: 980px;
  }
}

@media (max-width: 860px) {
  .app-shell {
    padding: 20px 16px 220px;
  }

  .hero,
  .control-bar,
  .info-dock {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .action-group {
    justify-items: stretch;
  }

  .load-action-wrap {
    width: 100%;
    justify-content: flex-start;
  }

  .download-action-wrap {
    width: 100%;
    justify-content: stretch;
  }

  .action-button {
    width: 100%;
  }

  .action-note {
    white-space: normal;
  }

  .info-status {
    min-width: 0;
  }

}

@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

  .skill-header {
    gap: 12px;
  }
}