:root,
:root[data-bt-theme="light"] {
  color-scheme: light;
  --bt-background: #f3f7fb;
  --bt-surface: #ffffff;
  --bt-surface-elevated: #ffffff;
  --bt-surface-interactive: #f7fbff;
  --bt-surface-muted: #eaf1f7;
  --bt-text-primary: #10253c;
  --bt-text-secondary: #4b6278;
  --bt-text-muted: #5b7186;
  --bt-border: #c6d5e2;
  --bt-border-strong: #91acc2;
  --bt-accent: #087dbb;
  --bt-accent-strong: #045d91;
  --bt-accent-soft: #d9f1fb;
  --bt-success: #087d5d;
  --bt-warning: #946000;
  --bt-danger: #b4233b;
  --bt-focus: #007dc3;
  --bt-disabled-bg: #e4ebf1;
  --bt-disabled-text: #718292;
  --bt-shadow: 0 18px 46px rgba(16, 48, 77, .11);
  --bt-shadow-soft: 0 8px 24px rgba(16, 48, 77, .08);
  --bg: var(--bt-background);
  --surface: var(--bt-surface);
  --surface-elevated: var(--bt-surface-elevated);
  --surface-muted: var(--bt-surface-muted);
  --text: var(--bt-text-primary);
  --text-primary: var(--bt-text-primary);
  --text-secondary: var(--bt-text-secondary);
  --text-muted: var(--bt-text-muted);
  --ink: var(--bt-text-primary);
  --muted: var(--bt-text-secondary);
  --border: var(--bt-border);
  --line: var(--bt-border);
  --border-subtle: color-mix(in srgb, var(--bt-border) 62%, transparent);
  --accent: var(--bt-accent);
  --accent-strong: var(--bt-accent-strong);
  --success: var(--bt-success);
  --warning: var(--bt-warning);
  --danger: var(--bt-danger);
  --shadow-card: var(--bt-shadow-soft);
  --premium-gradient: linear-gradient(100deg, #087be8, #31d5df);
}

:root[data-bt-theme="dark"] {
  color-scheme: dark;
  --bt-background: #061525;
  --bt-surface: #0b2035;
  --bt-surface-elevated: #102a43;
  --bt-surface-interactive: #122f4b;
  --bt-surface-muted: #17344e;
  --bt-text-primary: #f2f7fb;
  --bt-text-secondary: #b3c7d8;
  --bt-text-muted: #8fa8bd;
  --bt-border: #315473;
  --bt-border-strong: #4d789a;
  --bt-accent: #4bc7f2;
  --bt-accent-strong: #83dcf7;
  --bt-accent-soft: #143b58;
  --bt-success: #55dda9;
  --bt-warning: #ffd06c;
  --bt-danger: #ff7e91;
  --bt-focus: #76d9ff;
  --bt-disabled-bg: #183044;
  --bt-disabled-text: #7d94a6;
  --bt-shadow: 0 20px 52px rgba(1, 10, 19, .42);
  --bt-shadow-soft: 0 10px 28px rgba(1, 10, 19, .3);
  --bg: var(--bt-background);
  --surface: var(--bt-surface);
  --surface-elevated: var(--bt-surface-elevated);
  --surface-muted: var(--bt-surface-muted);
  --text: var(--bt-text-primary);
  --text-primary: var(--bt-text-primary);
  --text-secondary: var(--bt-text-secondary);
  --text-muted: var(--bt-text-muted);
  --ink: var(--bt-text-primary);
  --muted: var(--bt-text-secondary);
  --border: var(--bt-border);
  --line: var(--bt-border);
  --border-subtle: color-mix(in srgb, var(--bt-border) 62%, transparent);
  --accent: var(--bt-accent);
  --accent-strong: var(--bt-accent-strong);
  --success: var(--bt-success);
  --warning: var(--bt-warning);
  --danger: var(--bt-danger);
  --shadow-card: var(--bt-shadow-soft);
  --premium-gradient: linear-gradient(100deg, #1889ef, #3ed8df);
}

:root.release-3-premium[data-bt-theme] body {
  color: var(--bt-text-primary);
  background:
    radial-gradient(circle at 12% -8%, color-mix(in srgb, var(--bt-accent) 13%, transparent), transparent 34rem),
    radial-gradient(circle at 94% 5%, color-mix(in srgb, #37d9dc 10%, transparent), transparent 30rem),
    var(--bt-background);
}

:root.release-3-premium[data-bt-theme="dark"] body::before {
  opacity: .16;
  background-image: linear-gradient(rgba(114, 198, 237, .045) 1px, transparent 1px), linear-gradient(90deg, rgba(114, 198, 237, .045) 1px, transparent 1px);
}

:is(.card, .item, .progress-card, .weekly-plan-card, .student-overview-card, .student-management-card, .modal-card) {
  color: var(--bt-text-primary);
  background: var(--bt-surface);
  border-color: var(--bt-border);
  box-shadow: var(--bt-shadow-soft);
}

/*
 * Release 3 predates the theme tokens and has selectors with a higher
 * specificity. Keep those components on the same semantic palette in both
 * themes so light mode never inherits white-on-white or dark-only surfaces.
 */
:root.release-3-premium[data-bt-theme] :is(.card, .item, .progress-card, .weekly-plan-card, .student-overview-card, .student-management-card, .modal-card, .library-card, .feature-card, .history-group, .skill-trend-card, .recommendation-card) {
  color: var(--bt-text-primary);
  background: linear-gradient(145deg, var(--bt-surface-elevated), var(--bt-surface));
  border-color: var(--bt-border);
  box-shadow: var(--bt-shadow-soft);
}

:root.release-3-premium[data-bt-theme] :is(.metric, .counter-stats div, .potting-counter, .pool-counter, .fargo-row > div) {
  color: var(--bt-text-primary);
  background: var(--bt-surface-interactive);
  border-color: var(--bt-border);
}

:root.release-3-premium[data-bt-theme] :is(.metric b, .stat, .rating-number, .game-score),
:root.release-3-premium[data-bt-theme] :is(.field label, legend) {
  color: var(--bt-text-primary);
}

:root.release-3-premium[data-bt-theme] :is(.badge, .activity-pill, .profile-tag, .account-type-badge, .assignment-status) {
  color: var(--bt-accent-strong);
  background: var(--bt-accent-soft);
  border-color: color-mix(in srgb, var(--bt-accent) 34%, var(--bt-border));
}

:root.release-3-premium[data-bt-theme] :is(.activity-pill.status-green, .version) {
  color: var(--bt-success);
  background: color-mix(in srgb, var(--bt-success) 13%, var(--bt-surface));
  border-color: color-mix(in srgb, var(--bt-success) 38%, var(--bt-border));
}

:root.release-3-premium[data-bt-theme] .activity-pill.status-amber {
  color: var(--bt-warning);
  background: color-mix(in srgb, var(--bt-warning) 13%, var(--bt-surface));
  border-color: color-mix(in srgb, var(--bt-warning) 38%, var(--bt-border));
}

:root.release-3-premium[data-bt-theme] .activity-pill.status-red {
  color: var(--bt-danger);
  background: color-mix(in srgb, var(--bt-danger) 12%, var(--bt-surface));
  border-color: color-mix(in srgb, var(--bt-danger) 36%, var(--bt-border));
}

:is(input, select, textarea, .btn, .section-tabs, .top) {
  color: var(--bt-text-primary);
  background-color: var(--bt-surface-elevated);
  border-color: var(--bt-border);
}

:is(.btn, input, select, textarea, a, [tabindex]):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--bt-focus) 72%, transparent);
  outline-offset: 3px;
}

/* Brand actions stay blue/cyan; green remains reserved for confirmed success. */
:root.release-3-premium[data-bt-theme] .btn.primary,
:root.release-3-premium[data-bt-theme] .section-tabs .btn.active {
  color: #ffffff;
  background: linear-gradient(105deg, var(--bt-accent-strong), var(--bt-accent));
  border-color: color-mix(in srgb, var(--bt-accent) 74%, var(--bt-border));
  box-shadow: 0 8px 20px color-mix(in srgb, var(--bt-accent) 22%, transparent);
}

:root.release-3-premium[data-bt-theme] .btn.primary:hover,
:root.release-3-premium[data-bt-theme] .section-tabs .btn.active:hover {
  color: #ffffff;
  background: linear-gradient(105deg, var(--bt-accent-strong), color-mix(in srgb, var(--bt-accent) 82%, #ffffff));
}

.bar,
.rating-track { background: var(--bt-surface-muted); }
.bar > span,
.rating-fill { background: var(--premium-gradient); }

:is(.btn, input, select, textarea):disabled,
:is(.btn, input, select, textarea)[aria-disabled="true"] {
  color: var(--bt-disabled-text) !important;
  background: var(--bt-disabled-bg) !important;
  border-color: color-mix(in srgb, var(--bt-border) 70%, transparent) !important;
  opacity: 1;
  cursor: not-allowed;
}

.muted,
.small.muted { color: var(--bt-text-secondary) !important; }

/* Persistent player card: the two scales share one rectangle. */
.global-rating {
  width: clamp(260px, 29vw, 390px);
  min-width: 260px;
  color: var(--bt-text-primary);
  background: var(--bt-surface);
  border: 1px solid var(--bt-border);
  box-shadow: var(--bt-shadow-soft);
}

.global-rating-combined { display: grid; gap: 7px; }
.global-rating-head { gap: 14px; }
.global-rating-value { color: var(--bt-text-primary); font-size: 1.28rem; }
.global-rating-value small,
.global-focus-row small { color: var(--bt-text-muted); font-size: .62em; margin-left: 2px; }
.global-focus-row {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--border-subtle);
}
.global-focus-row > span { color: var(--bt-accent); font-size: .68rem; font-weight: 900; letter-spacing: .08em; }
.global-focus-row > strong { color: var(--bt-text-primary); font-size: 1.05rem; }
.global-focus-row > em { color: var(--bt-text-secondary); font-size: .7rem; font-style: normal; text-align: right; }

.player-metrics-card {
  border: 1px solid var(--bt-border);
  background: var(--bt-surface-elevated);
  color: var(--bt-text-primary);
  box-shadow: var(--bt-shadow-soft);
}
.rating-number { color: var(--bt-text-primary); }
.focus-number { color: var(--bt-accent-strong); }
.rating-number span,
.focus-number span { color: var(--bt-text-secondary); }
.rating-track { border-color: var(--bt-border); background: var(--bt-surface-muted); }
.rating-track-focus .rating-fill { background: linear-gradient(90deg, #258de9, #53d4e5); }

/* Approved Beyond Skill Grid: no orbit, balls or radar. */
.score-layout.bt-skill-grid-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 18px;
}

.bt-score-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px 28px;
  min-height: 174px;
  padding: clamp(24px, 4vw, 46px);
  color: var(--bt-text-primary);
  background: linear-gradient(130deg, color-mix(in srgb, var(--bt-surface-elevated) 94%, var(--bt-accent) 6%), var(--bt-surface));
  border: 1px solid var(--bt-border-strong);
  border-radius: 24px;
  box-shadow: var(--bt-shadow);
}

.bt-score-label { display: block; color: var(--bt-accent); font-size: .82rem; font-weight: 900; letter-spacing: .09em; }
.bt-score-level { display: inline-flex; margin-top: 13px; padding: 7px 12px; color: var(--bt-accent-strong); background: var(--bt-accent-soft); border: 1px solid color-mix(in srgb, var(--bt-accent) 34%, transparent); border-radius: 9px; font-size: .78rem; font-weight: 900; }
.bt-score-value { font-size: clamp(3.4rem, 7vw, 6.1rem); font-weight: 950; letter-spacing: -.06em; line-height: .9; font-variant-numeric: tabular-nums; }
.bt-score-value small { margin-left: 7px; color: var(--bt-text-muted); font-size: .34em; letter-spacing: -.02em; }
.bt-score-progress { grid-column: 1 / -1; height: 13px; overflow: hidden; background: var(--bt-surface-muted); border: 1px solid var(--bt-border); border-radius: 999px; }
.bt-score-progress i { display: block; width: var(--score-pct, 0%); height: 100%; background: var(--premium-gradient); border-radius: inherit; }

.bt-skill-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 20px; }
.bt-skill-card {
  --skill-accent: #25a9ee;
  grid-column: span 3;
  appearance: none;
  min-width: 0;
  min-height: 286px;
  padding: 24px 20px 18px;
  color: var(--bt-text-primary);
  background: linear-gradient(150deg, color-mix(in srgb, var(--bt-surface-elevated) 96%, var(--skill-accent) 4%), var(--bt-surface));
  border: 1px solid var(--bt-border-strong);
  border-radius: 18px;
  box-shadow: var(--bt-shadow-soft);
  text-align: center;
  cursor: pointer;
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.bt-skill-card:nth-child(5) { grid-column: 3 / span 3; }
.bt-skill-card:nth-child(6) { grid-column: 6 / span 3; }
.bt-skill-card:nth-child(7) { grid-column: 9 / span 3; }
.bt-skill-card:hover { transform: translateY(-3px); border-color: var(--skill-accent); box-shadow: var(--bt-shadow); }
.bt-skill-card:focus-visible { outline-color: var(--skill-accent); }
.bt-skill-card[data-skill="potting"] { --skill-accent: #d89f20; }
.bt-skill-card[data-skill="technique"] { --skill-accent: #e78730; }
.bt-skill-card[data-skill="break"] { --skill-accent: #28bdd1; }
.bt-skill-card[data-skill="position"] { --skill-accent: #ec6d82; }
.bt-skill-card[data-skill="cue_ball"] { --skill-accent: #25bce7; }
.bt-skill-card[data-skill="strategy"] { --skill-accent: #668df2; }
.bt-skill-card[data-skill="defense"] { --skill-accent: #aa82ed; }
.bt-skill-icon { display: grid; place-items: center; min-height: 44px; color: var(--skill-accent); font-size: 2rem; font-weight: 900; }
.bt-skill-name { display: block; min-height: 44px; margin-top: 8px; color: var(--skill-accent); font-size: .88rem; font-weight: 950; letter-spacing: .025em; text-transform: uppercase; overflow-wrap: anywhere; }
.bt-skill-value { display: block; margin: 12px 0 16px; color: var(--bt-text-primary); font-size: clamp(2.2rem, 4vw, 3.35rem); font-weight: 950; line-height: 1; font-variant-numeric: tabular-nums; }
.bt-skill-value small { display: inline; margin-left: 4px; color: var(--bt-text-muted); font-size: .37em; font-weight: 700; }
.bt-skill-card.is-empty .bt-skill-value small { display: block; margin: 9px 0 0; font-size: .28em; }
.bt-skill-progress { display: block; height: 8px; overflow: hidden; background: var(--bt-surface-muted); border-radius: 999px; }
.bt-skill-progress i { display: block; width: var(--skill-pct, 0%); height: 100%; background: linear-gradient(90deg, var(--bt-accent), var(--skill-accent)); border-radius: inherit; }
.bt-skill-meta { display: flex; justify-content: space-between; gap: 10px; margin-top: 17px; color: var(--bt-text-secondary); font-size: .73rem; }
.bt-skill-meta .trend-arrow.up { color: var(--bt-success); }
.bt-skill-meta .trend-arrow.down { color: var(--bt-danger); }
.bt-skill-meta .trend-arrow.flat { color: var(--bt-text-muted); }
.bt-skill-card.is-empty { border-style: dashed; }
.bt-skill-card.is-empty .bt-skill-icon,
.bt-skill-card.is-empty .bt-skill-name { opacity: .78; }
.score-detail { position: static; top: auto; }
.score-summary-strip > div { color: var(--bt-text-primary); background: var(--bt-surface-interactive); border: 1px solid var(--bt-border); }
.score-summary-strip b { color: var(--bt-text-primary); }
.score-summary-strip span { color: var(--bt-text-secondary); }

/* Four summaries only, as an invariant of each progress card. */
.metrics.bt-progress-summary { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.metrics.bt-progress-summary .metric { min-width: 0; background: var(--bt-surface-interactive); border-color: var(--bt-border); }
.chart-wrap { scrollbar-color: var(--bt-border-strong) var(--bt-surface-muted); }
.chart-wrap svg { color: var(--bt-text-primary); }

@media (max-width: 900px) {
  .topin { align-items: flex-start; }
  .header-actions { width: 100%; }
  .global-rating { width: min(100%, 430px); }
  .bt-skill-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .bt-skill-card,
  .bt-skill-card:nth-child(n) { grid-column: auto; min-height: 258px; }
  .bt-skill-card:last-child { grid-column: 1 / -1; }
  .metrics.bt-progress-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .bt-score-overview { min-height: 148px; padding: 22px 18px; border-radius: 18px; gap: 15px; }
  .bt-score-value { font-size: 3.25rem; }
  .bt-score-progress { height: 10px; }
  .bt-skill-grid { gap: 10px; }
  .bt-skill-card,
  .bt-skill-card:nth-child(n) { min-height: 216px; padding: 17px 10px 13px; border-radius: 14px; }
  .bt-skill-card:last-child { grid-column: 1 / -1; min-height: 186px; }
  .bt-skill-icon { min-height: 35px; font-size: 1.6rem; }
  .bt-skill-name { min-height: 36px; font-size: .7rem; }
  .bt-skill-value { margin: 9px 0 13px; font-size: 2.15rem; }
  .bt-skill-meta { gap: 5px; font-size: .62rem; }
  .score-summary-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .global-focus-row { grid-template-columns: auto auto; }
  .global-focus-row > em { grid-column: 1 / -1; text-align: left; }
  .metrics.bt-progress-summary { grid-template-columns: 1fr 1fr; }
  .chart-wrap svg { min-width: 470px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}