:root {
  view-transition-name: root;
  color-scheme: light;
  --bg: #f2f0e9;
  --nav-bg: rgba(250, 249, 244, 0.94);
  --card-bg: #fffdf8;
  --card-border: rgba(38, 53, 43, 0.14);
  --text: #232a25;
  --text-muted: #59665d;
  --accent: #286c61;
  --accent-hover: #347f72;
  --green: #39764d;
  --red: #a94339;
  --inset-bg: rgba(36, 53, 43, 0.045);
  --inset-border: rgba(36, 53, 43, 0.12);
  --secondary-bg: rgba(36, 53, 43, 0.09);
  --secondary-hover: rgba(36, 53, 43, 0.15);
}
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: page-leave .16s ease both; }
::view-transition-new(root) { animation: page-enter .28s cubic-bezier(.2,.75,.25,1) both; }
@keyframes page-leave { to { opacity: 0; transform: translateY(-5px) scale(.995); } }
@keyframes page-enter { from { opacity: 0; transform: translateY(9px) scale(.995); } to { opacity: 1; transform: translateY(0) scale(1); } }

:root[data-theme] {
  color-scheme: dark;
  --font-ui: "Aptos", "Segoe UI", sans-serif;
  --card-radius: 14px;
  --control-radius: 10px;
  --inset-bg: rgba(255, 255, 255, 0.035);
  --inset-border: rgba(255, 255, 255, 0.08);
  --secondary-bg: rgba(255, 255, 255, 0.1);
  --secondary-hover: rgba(255, 255, 255, 0.18);
}

:root[data-theme="moss"] {
  --bg: #101512;
  --nav-bg: rgba(18, 24, 20, 0.94);
  --card-bg: #1a211d;
  --card-border: rgba(225, 244, 232, 0.1);
  --text: #f2f7f3;
  --text-muted: #a6b3aa;
  --accent: #7ad7aa;
  --accent-hover: #9ae9c0;
  --green: #a7df91;
  --red: #ef796e;
}

:root[data-theme="tide"] {
  --bg: #10181b;
  --nav-bg: rgba(17, 27, 30, 0.95);
  --card-bg: #1a2529;
  --card-border: rgba(207, 235, 235, 0.12);
  --text: #eff7f6;
  --text-muted: #a6b7b8;
  --accent: #62c9c2;
  --accent-hover: #83ddd5;
  --green: #b6d98a;
  --red: #ef8276;
}

:root[data-theme="cobalt"] {
  --bg: #121720;
  --nav-bg: rgba(20, 27, 38, 0.95);
  --card-bg: #1d2734;
  --card-border: rgba(218, 229, 245, 0.12);
  --text: #f2f5fa;
  --text-muted: #a8b3c2;
  --accent: #85b8f5;
  --accent-hover: #a5cbf8;
  --green: #afd48d;
  --red: #f08776;
}

:root[data-theme="berry"] {
  --bg: #1b151b;
  --nav-bg: rgba(31, 22, 31, 0.95);
  --card-bg: #29202a;
  --card-border: rgba(241, 222, 239, 0.12);
  --text: #f8f1f7;
  --text-muted: #b9aab8;
  --accent: #d69ac8;
  --accent-hover: #e3b2d9;
  --green: #b4d797;
  --red: #ef8179;
}

:root[data-theme="ember"] {
  --bg: #1b1713;
  --nav-bg: rgba(31, 25, 20, 0.95);
  --card-bg: #29221b;
  --card-border: rgba(245, 230, 211, 0.12);
  --text: #f8f3ec;
  --text-muted: #baafa0;
  --accent: #e6a76f;
  --accent-hover: #f0bd8c;
  --green: #b5d28c;
  --red: #ed786a;
}

:root[data-theme="paper"] {
  color-scheme: light;
  --bg: #f2f0e9;
  --nav-bg: rgba(250, 249, 244, 0.94);
  --card-bg: #fffdf8;
  --card-border: rgba(38, 53, 43, 0.14);
  --text: #232a25;
  --text-muted: #59665d;
  --accent: #286c61;
  --accent-hover: #347f72;
  --green: #39764d;
  --red: #a94339;
  --inset-bg: rgba(36, 53, 43, 0.045);
  --inset-border: rgba(36, 53, 43, 0.12);
  --secondary-bg: rgba(36, 53, 43, 0.09);
  --secondary-hover: rgba(36, 53, 43, 0.15);
}

:root[data-tone="light"] {
  color-scheme: light;
  --inset-bg: rgba(36, 53, 43, 0.045);
  --inset-border: rgba(36, 53, 43, 0.12);
  --secondary-bg: rgba(36, 53, 43, 0.09);
  --secondary-hover: rgba(36, 53, 43, 0.15);
}

:root[data-theme] body,
:root[data-theme] * {
  font-family: var(--font-ui);
}

:root[data-theme] .card,
:root[data-theme] .game-card,
:root[data-theme] .stat-box,
:root[data-theme] .memory-card {
  border-radius: var(--card-radius);
}

:root[data-theme] .btn,
:root[data-theme] .field input,
:root[data-theme] .settings-btn {
  border-radius: var(--control-radius);
}

:root[data-theme] .stat-box,
:root[data-theme] .game-card {
  background: var(--inset-bg);
  border-color: var(--inset-border);
}

:root[data-theme] .btn.secondary {
  background: var(--secondary-bg);
}

:root[data-theme] .btn.secondary:hover {
  background: var(--secondary-hover);
}

:root[data-theme="paper"] .field input,
:root[data-tone="light"] .field input {
  background: var(--inset-bg);
  color: var(--text);
}

:root[data-theme="paper"] .field input::placeholder,
:root[data-tone="light"] .field input::placeholder {
  color: var(--text-muted);
}

:root[data-theme="paper"] .setup-screen,
:root[data-tone="light"] .setup-screen {
  background: rgba(36, 43, 38, 0.42);
}

.theme-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--inset-bg);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.theme-trigger:hover,
.theme-trigger:focus-visible {
  border-color: var(--accent);
}

.theme-trigger-mark {
  width: 14px;
  height: 14px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  box-shadow: inset -5px 0 var(--accent);
}

.theme-dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min(620px, calc(100vw - 28px));
  max-height: min(88vh, 760px);
  overflow: auto;
  padding: 0;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.42);
}

.theme-dialog::backdrop {
  background: rgba(8, 12, 10, 0.68);
  backdrop-filter: blur(8px);
}

.theme-panel { padding: 26px; }
.theme-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; margin-bottom: 22px; }
.theme-header h2 { font-size: 1.35rem; margin-bottom: 5px; }
.theme-header p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.45; }
.theme-close { width: 36px; height: 36px; flex: 0 0 36px; border: 1px solid var(--card-border); border-radius: 50%; color: var(--text); background: var(--inset-bg); font-size: 1.25rem; cursor: pointer; }
.theme-section + .theme-section { margin-top: 24px; }
.theme-section h3 { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; margin-bottom: 11px; }
.theme-presets { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.theme-option { display: flex; align-items: center; gap: 10px; min-width: 0; padding: 10px; border: 1px solid var(--card-border); border-radius: 9px; color: var(--text); background: transparent; text-align: left; cursor: pointer; }
.theme-option:hover { border-color: var(--accent); }
.theme-option[aria-pressed="true"] { border-color: var(--accent); background: var(--inset-bg); }
.theme-swatch { display: flex; width: 32px; height: 32px; flex: 0 0 32px; overflow: hidden; border: 1px solid var(--card-border); border-radius: 50%; background: var(--swatch-bg); }
.theme-swatch::after { content: ""; width: 50%; background: var(--swatch-accent); }
.theme-option-name { overflow: hidden; font-size: 0.88rem; text-overflow: ellipsis; white-space: nowrap; }
.theme-selected { margin-left: auto; color: var(--accent); font-size: 0.9rem; }
.theme-color-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 14px; }
.theme-color-field { display: flex; justify-content: space-between; align-items: center; gap: 10px; color: var(--text); font-size: 0.88rem; }
.theme-color-field input { width: 42px; height: 34px; padding: 3px; border: 1px solid var(--card-border); border-radius: 7px; background: var(--inset-bg); cursor: pointer; }
.theme-select-field,.theme-range-field { display: grid; grid-template-columns: 1fr minmax(145px, 0.8fr); align-items: center; gap: 12px; margin-top: 14px; color: var(--text); font-size: 0.88rem; }
.theme-select-field select { min-width: 0; padding: 9px 10px; border: 1px solid var(--card-border); border-radius: 7px; color: var(--text); background: var(--bg); }
.theme-range-field input { width: 100%; accent-color: var(--accent); }
.theme-actions { display: flex; justify-content: flex-end; margin-top: 22px; }
.theme-reset { border: 0; padding: 8px 0; color: var(--accent); background: transparent; font: inherit; cursor: pointer; }
:root[data-theme] .btn { color: var(--accent-contrast, #fff); }
:root[data-theme] .btn.secondary { color: var(--text); border: 1px solid var(--card-border); }

:root[data-theme] :focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

:root[data-theme] .source-list { margin: 0 0 18px; padding-left: 22px; color: var(--text-muted); line-height: 1.7; }
:root[data-theme] .source-list a { color: var(--accent); text-underline-offset: 3px; }
:root[data-theme] .footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 10px; }
:root[data-theme] .footer-links a { color: var(--accent); text-underline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
  :root[data-theme] *, :root[data-theme] *::before, :root[data-theme] *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media(max-width: 640px) {
  .theme-trigger { padding: 7px 9px; font-size: 0.78rem; }
  .theme-panel { padding: 20px 16px; }
  .theme-presets { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .theme-color-grid { gap: 10px; }
}