/* Atreemology — design system & styles. Hand-written, zero dependencies. */

:root {
  --color-bg: #faf6ec;
  --color-surface: #ffffff;
  --color-surface-alt: #f2ecdc;
  --color-border: #e4dcc8;
  --color-text: #202a1e;
  --color-text-muted: #5c6555;
  --color-text-faint: #8b9382;

  --color-primary: #2f6e4e;
  --color-primary-dark: #1e4a34;
  --color-primary-light: #dcefe0;
  --color-accent: #e2972f;
  --color-accent-soft: #fbe7c3;
  --color-bark: #7c5b43;
  --color-soil: #e7dabd;
  --color-soil-dark: #cdb98f;
  --color-danger: #b5432f;
  --color-danger-soft: #f7ddd6;
  --color-accent-text: #8a5a12;
  --color-on-primary-dark: #ffffff;

  --bud-fill: #efe7d2;
  --bud-stroke: #c9bd9e;
  --leaf-new: #b9d9a8;
  --leaf-mid: #7fbf7a;
  --leaf-bright: #3f9a56;
  --leaf-stroke: #2c6b3c;
  --due-fill: #f6d17a;
  --due-stroke: #c98f2a;
  --flower-fill: #f2a7b0;
  --flower-stroke: #c96b7b;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 3px rgba(32, 42, 30, 0.08);
  --shadow-md: 0 8px 24px rgba(32, 42, 30, 0.12);
  --font-sans: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --transition-fast: 160ms ease;
  --transition-med: 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Dark theme ----------
   A "forest at night" palette: the same warm-woodland identity, shifted to
   deep bark and canopy tones. Structural tokens only — the small fixed
   status chips (health-content, health-misty, due-tag) stay their own
   light pastel + dark-text pair in both themes on purpose, the way a
   caution-yellow badge does in most apps. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #171d14;
    --color-surface: #202821;
    --color-surface-alt: #283127;
    --color-border: #3a4434;
    --color-text: #eef1e7;
    --color-text-muted: #aab29e;
    --color-text-faint: #79826e;

    --color-primary: #3fa06a;
    --color-primary-dark: #7fe0ab;
    --color-primary-light: #1c3226;
    --color-accent: #e2972f;
    --color-accent-soft: #3a2c14;
    --color-accent-text: #f3b969;
    --color-on-primary-dark: #0d2417;
    --color-bark: #4a3527;
    --color-soil: #2a2118;
    --color-soil-dark: #1c150f;
    --color-danger: #e2685a;
    --color-danger-soft: #3a2220;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  }
}
:root[data-theme="dark"] {
  --color-bg: #171d14;
  --color-surface: #202821;
  --color-surface-alt: #283127;
  --color-border: #3a4434;
  --color-text: #eef1e7;
  --color-text-muted: #aab29e;
  --color-text-faint: #79826e;

  --color-primary: #3fa06a;
  --color-primary-dark: #7fe0ab;
  --color-primary-light: #1c3226;
  --color-accent: #e2972f;
  --color-accent-soft: #3a2c14;
  --color-accent-text: #f3b969;
  --color-on-primary-dark: #0d2417;
  --color-bark: #4a3527;
  --color-soil: #2a2118;
  --color-soil-dark: #1c150f;
  --color-danger: #e2685a;
  --color-danger-soft: #3a2220;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ---------- Supporter theme ("Golden Grove") ----------
   Cosmetic-only reward unlocked by the one-time Supporter purchase
   (see profile.js / store.js unlockSupporter). Only the "chrome" tokens
   shift to a warm gold: buttons, nav highlights, headers. The tree/plant
   illustration palette (--leaf-*, --bud-*, --due-*, --flower-*) is left
   untouched on purpose, so a supporter's forest still looks like a forest. */
:root[data-supporter-theme="1"] {
  --color-primary: #b8791a;
  --color-primary-dark: #8a5a12;
  --color-primary-light: #f7e3b0;
  --color-on-primary-dark: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"])[data-supporter-theme="1"] {
    --color-primary: #e0a83f;
    --color-primary-dark: #f3c869;
    --color-primary-light: #3a2c14;
    --color-on-primary-dark: #17130a;
  }
}
:root[data-theme="dark"][data-supporter-theme="1"] {
  --color-primary: #e0a83f;
  --color-primary-dark: #f3c869;
  --color-primary-light: #3a2c14;
  --color-on-primary-dark: #17130a;
}

* { box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-soil);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

/* The app shell is pinned to exactly one viewport height (never taller), so
   .app-main below is the ONLY thing that scrolls. Before this, #root and
   .app-shell used `min-height: 100vh`, which let them grow past one
   viewport on any page with enough content (the Seed Library, Home) — the
   whole document scrolled instead of .app-main internally, so the bottom
   nav (a flex sibling docked below .app-main) just sat at the physical
   bottom of that overgrown page, invisible until you scrolled all the way
   down. `height: 100dvh` (with a `100vh` fallback for older browsers) also
   avoids the related mobile-Safari issue where `100vh` measures past the
   collapsed address bar. */
#root {
  display: flex;
  justify-content: center;
  height: 100vh;
  height: 100dvh;
  background: var(--color-soil);
  overflow: hidden;
}

button, input { font-family: inherit; }

a { color: var(--color-primary-dark); }

.app-shell {
  width: 100%;
  max-width: 480px;
  height: 100%;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.app-main {
  flex: 1;
  /* Flex items default to `min-height: auto`, which lets a block-level
     child grow to fit ALL of its content and ignore `overflow-y: auto`
     entirely — the other half of the bug above. `min-height: 0` is what
     actually lets this item stop at its allotted flex space and scroll
     its own content instead of stretching .app-shell past the viewport. */
  min-height: 0;
  overflow-y: auto;
  padding-bottom: 96px;
  -webkit-overflow-scrolling: touch;
}

.screen { padding: 20px 20px 8px; animation: fade-in var(--transition-med); }

@keyframes fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- Bottom nav ---------- */
.bottom-nav {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  z-index: 20;
}
.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: none;
  border: none;
  color: var(--color-text-faint);
  padding: 6px 2px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.nav-tab .icon { display: inline-flex; }
.nav-tab .icon svg { width: 100%; height: 100%; color: inherit; }
.nav-label { font-size: 11px; font-weight: 600; }
.nav-tab.active { color: var(--color-primary); }
.nav-tab:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Sidebar brand header — hidden on mobile (the bottom nav has no room for
   it), shown only once the desktop breakpoint turns .bottom-nav into a
   left sidebar (see the desktop section at the bottom of this file). */
.nav-brand { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}
.btn .icon svg { width: 100%; height: 100%; }
.btn:active { transform: scale(0.97); }
.btn:focus-visible { outline: 2px solid var(--color-primary-dark); outline-offset: 2px; }
.btn:disabled { cursor: default; opacity: 0.55; box-shadow: none; transform: none; background: var(--color-border); color: var(--color-text-faint); }
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-primary-dark); color: var(--color-on-primary-dark); }
.btn-secondary { background: var(--color-primary-light); color: var(--color-primary-dark); }
.btn-ghost { background: transparent; color: var(--color-text-muted); border-color: var(--color-border); }
.btn-accent { background: var(--color-accent); color: #fff; box-shadow: var(--shadow-sm); }
.btn-accent:hover { filter: brightness(0.94); }
.btn-danger { color: var(--color-danger); }
.btn-block { width: 100%; }
.btn-large { padding: 16px 18px; font-size: 16px; }
.btn-small { padding: 8px 12px; font-size: 13px; }
.icon-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--color-text);
}
.link-btn { background: none; border: none; color: var(--color-primary-dark); font-weight: 600; font-size: 13px; cursor: pointer; padding: 4px; }

.icon { display: inline-flex; align-items: center; justify-content: center; }
.icon svg { width: 100%; height: 100%; }

/* ---------- Header / home ---------- */
.home-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.home-eyebrow { display: none; }
.home-greeting { font-size: 22px; margin: 2px 0 0; }
.streak-display { display: flex; align-items: center; gap: 6px; background: var(--color-accent-soft); color: var(--color-accent-text); padding: 6px 12px; border-radius: 999px; font-weight: 700; }
.streak-display .icon { color: var(--color-accent); width: 20px; height: 20px; }
.streak-display--big { padding: 10px 18px; font-size: 18px; }
.streak-longest { font-size: 12px; font-weight: 500; color: var(--color-text-muted); margin-left: 6px; }

.screen-header { margin-bottom: 14px; position: relative; }
.screen-header h1 { margin: 0 0 2px; font-size: 24px; }
.screen-sub { margin: 0; color: var(--color-text-muted); font-size: 14px; }
.back-btn { position: absolute; left: 0; top: 0; }
.root-detail-screen .screen-header { padding-left: 46px; }

/* ---------- Sprig ---------- */
.sprig {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin: 12px 0;
}
.sprig-orb { font-size: 18px; animation: sprig-pulse 2.4s ease-in-out infinite; }
.sprig-text { margin: 0; font-size: 14px; color: var(--color-primary-dark); line-height: 1.4; }
@keyframes sprig-pulse { 0%, 100% { transform: scale(1); opacity: 0.85; } 50% { transform: scale(1.15); opacity: 1; } }

/* ---------- Stat tiles ---------- */
.forest-stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0; }
.stat-tile { background: var(--color-surface); border-radius: var(--radius-md); padding: 12px 8px; display: flex; flex-direction: column; align-items: center; gap: 4px; box-shadow: var(--shadow-sm); }
.stat-tile .icon { color: var(--color-primary); }
.stat-tile strong { font-size: 18px; }
.stat-tile span:last-child { font-size: 11px; color: var(--color-text-muted); text-align: center; }

.home-section { margin: 22px 0; }
.section-heading-row { display: flex; align-items: center; justify-content: space-between; }
.home-section h2 { font-size: 16px; margin: 0 0 8px; display: flex; align-items: center; gap: 6px; }
.home-section h2 .icon { color: var(--color-accent); width: 18px; height: 18px; }

/* ---------- Review queue ---------- */
.review-queue { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.review-row { display: flex; align-items: center; justify-content: space-between; background: var(--color-surface); border-radius: var(--radius-sm); padding: 10px 12px; box-shadow: var(--shadow-sm); }
.review-row-info { display: flex; flex-direction: column; }
.review-row-root { font-size: 12px; color: var(--color-text-muted); }
.review-row-more { text-align: center; font-size: 12px; color: var(--color-text-muted); padding: 4px; }
.review-queue-empty { display: flex; align-items: center; gap: 8px; color: var(--color-text-muted); background: var(--color-surface); padding: 12px; border-radius: var(--radius-sm); }
.review-queue-empty .icon { color: var(--color-primary); }

/* ---------- Journal ---------- */
.journal-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.journal-entry { background: var(--color-surface); border-radius: var(--radius-sm); padding: 10px 12px; box-shadow: var(--shadow-sm); }
.journal-date { font-size: 11px; color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.04em; }
.journal-text { margin: 2px 0 0; font-size: 14px; }
.empty-hint { color: var(--color-text-muted); font-size: 14px; }

/* ---------- Crash fallback ---------- */
/* Deliberately styled with only classes/vars that exist app-wide (no
   feature-specific styling), since this is the screen that has to render
   even when something else in the app is broken. */
.crash-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  min-height: 60vh;
  padding-top: 15vh;
}
.crash-icon { font-size: 48px; line-height: 1; }
.crash-screen h1 { margin: 0; font-size: 20px; }
.crash-screen p { margin: 0 0 8px; color: var(--color-text-muted); font-size: 14px; max-width: 320px; }
.crash-screen .btn { max-width: 280px; }

/* ---------- Seed Library ---------- */
.search-input, .text-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 15px;
  margin-bottom: 10px;
}
.search-input:focus, .text-input:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.category-chip-row { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 6px; }
.chip {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.chip-active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.root-card-grid { display: flex; flex-direction: column; gap: 12px; }
.root-card-group-heading {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin: 4px 0 -2px;
}
.root-card-group-heading:first-child { margin-top: 0; }
.root-card-group-subhead { font-size: 12px; font-weight: 500; text-transform: none; letter-spacing: normal; opacity: 0.75; }
.root-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.root-card-top { display: flex; align-items: flex-start; gap: 10px; }
.root-card-emblem { font-size: 26px; }
.root-card-heading { flex: 1; }
.root-card-heading h3 { margin: 0; font-size: 17px; }
.root-card-meaning { margin: 2px 0 0; font-size: 13px; color: var(--color-text-muted); }
.difficulty { color: var(--color-accent); font-size: 11px; letter-spacing: 2px; margin-top: 4px; }
.root-card-category { font-size: 12px; color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.05em; margin: 0; }
.root-card-hint { margin: 0; font-size: 13px; color: var(--color-text-muted); }
.root-card-bridges { margin: 0; font-size: 12px; color: var(--color-primary-dark); background: var(--color-primary-light); border-radius: var(--radius-sm); padding: 5px 8px; }
.root-card.root-locked { opacity: 0.72; background: var(--color-surface-alt); }
.root-card.root-locked .root-card-emblem { filter: grayscale(1); }

.coming-soon-section { margin-top: 22px; }
.coming-soon-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
}
.coming-soon-caret { font-size: 11px; }
.coming-soon-note { font-size: 12px; color: var(--color-text-faint); margin: 10px 2px; }
.coming-soon-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.coming-soon-chip {
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.coming-soon-chip strong { font-size: 12px; }
.coming-soon-chip span { font-size: 11px; color: var(--color-text-faint); }
.progress-row { display: flex; justify-content: space-between; font-size: 12px; color: var(--color-text-muted); margin-bottom: 4px; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--color-surface-alt); overflow: hidden; }
.progress-bar-fill { height: 100%; background: linear-gradient(90deg, var(--leaf-mid), var(--leaf-bright)); border-radius: 999px; transition: width var(--transition-med); }
.root-card-meta { display: flex; gap: 8px; margin-top: 6px; flex-wrap: wrap; }
.badge, .health-tag, .due-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}
.health-thriving { background: var(--color-primary-light); color: var(--color-primary-dark); }
.health-content { background: #eaf2e2; color: #4a6b34; }
.health-thirsty { background: var(--color-accent-soft); color: var(--color-accent-text); }
.health-misty { background: #eee7f4; color: #6a4f8c; }
.due-tag { background: var(--due-fill); color: #6b4a12; }

/* ---------- Forest / grove ---------- */
.forest-grove { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.grove-tree {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 6px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.grove-tree-emoji { font-size: 22px; }
.grove-tree-name { font-size: 12px; font-weight: 700; }
.mini-progress { width: 80%; height: 5px; background: var(--color-surface-alt); border-radius: 999px; overflow: hidden; }
.mini-progress-fill { height: 100%; background: var(--leaf-bright); }
.grove-due-dot { position: absolute; top: 8px; right: 10px; width: 8px; height: 8px; border-radius: 999px; background: var(--due-stroke); }
.constellation-note { background: var(--color-primary-light); border-radius: var(--radius-md); padding: 14px; }
.constellation-list { margin: 0; padding-left: 18px; font-size: 13px; color: var(--color-primary-dark); }
.constellation-list li { margin-bottom: 4px; }

.forest-scene {
  position: relative;
  width: 100%;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 18px;
  background: linear-gradient(180deg, #cfe9f7 0%, #e7f3e0 55%, #dcefc9 100%);
  box-shadow: var(--shadow-sm);
}
.forest-sun {
  position: absolute;
  top: 18px;
  right: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff6d8, var(--color-accent) 70%);
  box-shadow: 0 0 24px rgba(226, 151, 47, 0.45);
}
.forest-hill {
  position: absolute;
  left: -10%;
  width: 120%;
  height: 120px;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}
.forest-hill--back { bottom: -20px; height: 150px; background: #cfe3b8; opacity: 0.9; }
.forest-hill--front { bottom: -40px; height: 130px; background: #b9d99e; }
.forest-scene-trees { position: absolute; inset: 0; }
.forest-bridges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.forest-bridge-path { fill: none; stroke: var(--color-bark); stroke-width: 2.6; opacity: 0.75; stroke-dasharray: 3 4; stroke-linecap: round; vector-effect: non-scaling-stroke; }
.forest-bridge-labels { position: absolute; inset: 0; }
.forest-bridge-label {
  position: absolute;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--color-surface);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}
.forest-bridge-label:hover, .forest-bridge-label:focus-visible { transform: translate(-50%, -50%) scale(1.1); }
.forest-bridge-label--learned { background: var(--color-primary-light); }
.scene-tree {
  position: absolute;
  transform: translate(-50%, -50%);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  line-height: 1;
  transition: transform var(--transition-fast);
}
.scene-tree:hover, .scene-tree:focus-visible { transform: translate(-50%, -50%) scale(1.15); }
.scene-tree-emoji { display: block; font-size: 30px; filter: drop-shadow(0 2px 3px rgba(32, 42, 30, 0.25)); }
.scene-tree-due {
  position: absolute;
  top: -2px;
  right: -4px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--due-stroke);
  border: 2px solid #fff;
}

/* ---------- Empty state ---------- */
.empty-state { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 12px; padding: 32px 12px; color: var(--color-text-muted); }
.empty-state-art { font-size: 40px; }

/* ---------- Root detail / tree ---------- */
.origin-note { font-size: 13px; color: var(--color-text-muted); background: var(--color-surface-alt); padding: 10px 12px; border-radius: var(--radius-sm); }
.root-detail-badges { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.stage-copy { font-size: 13px; color: var(--color-text-muted); margin: 0 0 6px; }
.tree-canvas { display: flex; justify-content: center; margin: 4px -6px 6px; }
.root-tree { width: 100%; max-width: 340px; height: auto; }
.tree-soil { fill: var(--color-soil); }
.tree-groundline { stroke: var(--color-soil-dark); stroke-width: 1.5; stroke-dasharray: 3 4; }
.tree-trunk { fill: var(--color-bark); }
.tree-taproot { stroke: var(--color-bark); stroke-width: 3; opacity: 0.7; stroke-linecap: round; }
.tree-root-point { fill: var(--color-bark); opacity: 0.9; }
.tree-root-label {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  fill: #f6ecd9;
  paint-order: stroke;
  stroke: rgba(0, 0, 0, 0.45);
  stroke-width: 3px;
  stroke-linejoin: round;
  pointer-events: none;
  user-select: none;
}
.tree-branch { stroke: var(--color-bark); stroke-width: 2.4; opacity: 0.85; }
.tree-branch--connector { stroke: #8a6a4f; stroke-width: 2; }
.tree-node { cursor: pointer; }
.tree-node:focus-visible .tree-node-dot { stroke: var(--color-primary-dark); stroke-width: 3; }
.tree-node-pulse { fill: var(--due-fill); opacity: 0.35; animation: node-pulse 1.8s ease-in-out infinite; }
@keyframes node-pulse { 0%, 100% { r: 14; opacity: 0.35; } 50% { r: 18; opacity: 0.12; } }
.tree-node-petal { fill: var(--flower-fill); opacity: 0.9; }
.root-detail-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }

/* ---------- Sheets (modals) ---------- */
.sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 26, 18, 0);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 50;
  transition: background var(--transition-med);
}
.sheet-overlay.open { background: rgba(20, 26, 18, 0.45); }
.sheet {
  width: 100%;
  max-width: 480px;
  background: var(--color-surface);
  border-radius: 24px 24px 0 0;
  padding: 10px 20px calc(24px + env(safe-area-inset-bottom));
  transform: translateY(100%);
  transition: transform var(--transition-med);
  max-height: 86vh;
  overflow-y: auto;
}
.sheet-overlay.open .sheet { transform: translateY(0); }
.sheet-grabber { width: 40px; height: 4px; background: var(--color-border); border-radius: 999px; margin: 0 auto 10px; }
.sheet-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.sheet-level-tag { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-primary); background: var(--color-primary-light); padding: 3px 10px; border-radius: 999px; }
.sheet-word { margin: 4px 0 0; font-size: 26px; text-transform: capitalize; }
.sheet-pos { margin: 0 0 8px; font-style: italic; color: var(--color-text-muted); font-size: 13px; }
.sheet-definition { font-size: 15px; margin: 0 0 10px; }
.sheet-example { margin: 0 0 12px; padding-left: 12px; border-left: 3px solid var(--color-accent-soft); color: var(--color-text-muted); font-style: italic; }
.sheet-relation { background: var(--color-surface-alt); border-radius: var(--radius-sm); padding: 10px 12px; margin-bottom: 12px; }
.sheet-relation-label { display: block; font-size: 11px; font-weight: 700; text-transform: uppercase; color: var(--color-bark); margin-bottom: 4px; letter-spacing: 0.03em; }
.sheet-relation p { margin: 0; font-size: 14px; }
.sheet-shared { font-size: 13px; color: var(--color-primary-dark); background: var(--color-primary-light); padding: 8px 12px; border-radius: var(--radius-sm); margin-bottom: 12px; }
.sheet-mastered { display: flex; align-items: center; gap: 8px; color: var(--color-primary-dark); font-size: 14px; padding: 8px 0; }
.sheet-review-prompt { font-size: 14px; margin: 4px 0 10px; }
.reward-icon-big { font-size: 56px; text-align: center; }
.reward-earned-from { text-align: center; color: var(--color-text-muted); font-size: 13px; margin-top: 0; }

.rating-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 8px; }
.rating-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  font-size: 12px;
}
.rating-label { font-weight: 700; }
.rating-sub { font-size: 10px; color: var(--color-text-muted); }
.rating-again { border-color: #e3b9ac; }
.rating-hard { border-color: #e6cf9c; }
.rating-good { border-color: #a9d3ac; }
.rating-easy { border-color: #8fc7c9; }
.rating-btn.suggested { box-shadow: 0 0 0 2px var(--color-primary-light) inset; }
.rating-btn:hover { transform: translateY(-1px); }

/* ---------- Quiz ---------- */
.quiz-header { display: flex; align-items: center; gap: 10px; padding-left: 0; }
.quiz-progress-bar { flex: 1; height: 6px; background: var(--color-surface-alt); border-radius: 999px; overflow: hidden; }
.quiz-progress-fill { height: 100%; width: 0; background: var(--color-primary); transition: width var(--transition-med); }
.quiz-card { margin-top: 10px; }
.quiz-type-tag { font-size: 11px; font-weight: 700; text-transform: uppercase; color: var(--color-accent); letter-spacing: 0.05em; }
.quiz-prompt { font-size: 19px; margin: 6px 0 16px; line-height: 1.35; }
.quiz-choices { display: flex; flex-direction: column; gap: 10px; }
.quiz-choice {
  text-align: left;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  font-size: 15px;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.quiz-choice:hover:not(:disabled) { border-color: var(--color-primary); }
.quiz-choice:disabled { cursor: default; }
.quiz-choice.correct { border-color: var(--color-primary); background: var(--color-primary-light); }
.quiz-choice.incorrect { border-color: var(--color-danger); background: var(--color-danger-soft); }
.quiz-feedback { margin-top: 16px; }
.feedback-panel { background: var(--color-surface-alt); border-radius: var(--radius-md); padding: 14px; animation: fade-in var(--transition-med); }
.feedback-headline-row { display: flex; align-items: center; gap: 8px; font-weight: 700; margin-bottom: 6px; }
.feedback-panel.correct .feedback-headline-row { color: var(--color-primary-dark); }
.feedback-panel.incorrect .feedback-headline-row { color: var(--color-danger); }
.feedback-explain { font-size: 14px; margin: 0 0 10px; }
.feedback-ask { font-size: 13px; color: var(--color-text-muted); margin: 0 0 8px; }
.quiz-summary { text-align: center; padding: 24px 8px; }
.quiz-summary-art { font-size: 44px; margin-bottom: 8px; }

/* ---------- Rewards ---------- */
.streak-milestones { margin-bottom: 18px; }
.reward-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.reward-tile {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 16px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  border: 1px solid var(--color-border);
}
.reward-tile.locked { opacity: 0.7; }
.reward-tile.earned { background: var(--color-accent-soft); border-color: var(--color-accent); }
.reward-tile-icon { font-size: 28px; }
.reward-tile-title { font-size: 13px; font-weight: 700; }
.reward-tile-hint { font-size: 11px; color: var(--color-text-muted); }

.tree-rewards-heading { margin-top: 4px; }
.badge-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.milestone-badge {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 6px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  opacity: 0.6;
}
.milestone-badge.earned { opacity: 1; background: var(--color-accent-soft); border-color: var(--color-accent); }
.milestone-badge-icon { font-size: 22px; }
.milestone-badge-label { font-size: 10px; font-weight: 700; color: var(--color-text-muted); line-height: 1.25; }
.milestone-badge.earned .milestone-badge-label { color: var(--color-accent-text); }

/* ---------- Onboarding ---------- */
.onboarding-screen { padding: 40px 24px 24px; display: flex; flex-direction: column; min-height: calc(100vh - 40px); }
.onboarding-art { font-size: 64px; text-align: center; margin-bottom: 24px; }
.onboarding-title { font-size: 24px; text-align: center; margin: 0 0 12px; }
.onboarding-body { font-size: 15px; color: var(--color-text-muted); text-align: center; line-height: 1.5; }
.onboarding-dots { display: flex; justify-content: center; gap: 8px; margin: auto 0 24px; }
.dot { width: 8px; height: 8px; border-radius: 999px; background: var(--color-border); }
.dot-active { background: var(--color-primary); width: 22px; }
.onboarding-actions { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
.onboarding-seed-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 20px 0; }
.onboarding-seed-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 8px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
}
.onboarding-seed-option.selected { border-color: var(--color-primary); background: var(--color-primary-light); }
.onboarding-seed-emoji { font-size: 22px; }
.onboarding-seed-root { font-weight: 700; font-size: 13px; }
.onboarding-seed-meaning { font-size: 11px; color: var(--color-text-muted); }
.onboarding-name-label { display: block; font-size: 13px; color: var(--color-text-muted); margin-bottom: 6px; }
.onboarding-name-input { width: 100%; padding: 12px 14px; border-radius: var(--radius-md); border: 1px solid var(--color-border); font-size: 15px; margin-bottom: 16px; }

/* ---------- Profile ---------- */
.profile-card { background: var(--color-surface); border-radius: var(--radius-lg); padding: 16px; margin-bottom: 18px; display: flex; flex-direction: column; gap: 14px; box-shadow: var(--shadow-sm); }
.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--color-text-muted); }
.field-label input { display: block; margin-top: 6px; }
.toggle-row { display: flex; align-items: center; justify-content: space-between; font-size: 14px; font-weight: 600; }
.toggle-hint { display: block; font-size: 12px; font-weight: 400; color: var(--color-text-muted); }
.profile-stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.stat-block { background: var(--color-surface); border-radius: var(--radius-md); padding: 12px 6px; text-align: center; box-shadow: var(--shadow-sm); }
.stat-block strong { display: block; font-size: 18px; }
.stat-block span { font-size: 11px; color: var(--color-text-muted); }
.danger-zone { margin: 24px 0 12px; text-align: center; display: flex; flex-direction: column; gap: 10px; }
.field-hint { margin: 0; font-size: 12px; color: var(--color-text-muted); }

.supporter-welcome {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--color-accent-soft);
  color: var(--color-accent-text);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 18px;
  font-weight: 600;
  font-size: 14px;
}
.supporter-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}
.supporter-card--active { background: var(--color-accent-soft); border-color: var(--color-accent); }
.supporter-card p { margin: 0 0 12px; font-size: 13px; color: var(--color-text-muted); line-height: 1.5; }
.supporter-card .btn { margin-bottom: 8px; }
.supporter-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent-soft);
  color: var(--color-accent-text);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 10px;
}

.roadmap-list { display: flex; flex-direction: column; gap: 10px; }
.roadmap-tier {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}
.roadmap-tier--done { background: var(--color-primary-light); border-color: var(--color-primary); }
.roadmap-tier-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 14px; margin-bottom: 4px; }
.roadmap-tier-head span { font-size: 12px; color: var(--color-text-muted); font-weight: 600; }
.roadmap-tier p { margin: 0; font-size: 12px; color: var(--color-text-muted); }

/* ---------- Accessibility & motion ---------- */
:focus-visible { outline: 2px solid var(--color-primary-dark); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Desktop layout ----------
   Below 900px the app is untouched: one mobile-width column with a bottom
   tab bar, exactly like a phone. There used to be a rule here that just
   added vertical padding and a bark-brown background behind the same
   480px-wide column for ANY screen over 480px — which is exactly why the
   desktop/laptop view looked like a phone mockup floating in empty space
   instead of a real desktop layout. This replaces that with an actual
   reflow at a real desktop breakpoint.

   No markup changes were needed to move the nav from bottom to side: the
   DOM is always [.app-main, .bottom-nav] inside .app-shell (see app.js),
   and flex-direction: row-reverse visually places the LAST child (the
   nav) first — i.e. on the left — without touching JS. */
@media (min-width: 900px) {
  body { background: var(--color-surface-alt); }
  #root { padding: 28px 24px; }
  .app-shell {
    max-width: 1240px;
    flex-direction: row-reverse;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
  }

  /* ----- sidebar (same .bottom-nav element, reflowed) ----- */
  .bottom-nav {
    position: static;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    width: 232px;
    flex-shrink: 0;
    gap: 4px;
    padding: 20px 14px;
    border-top: none;
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
  }
  .nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 10px 20px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-brand-icon { border-radius: 8px; display: block; }
  .nav-brand-text { font-size: 17px; font-weight: 800; color: var(--color-primary-dark); }
  .nav-tab {
    flex: none;
    flex-direction: row;
    justify-content: flex-start;
    gap: 12px;
    padding: 11px 12px;
    border-radius: var(--radius-sm);
  }
  .nav-tab .icon { width: 22px; height: 22px; flex-shrink: 0; }
  .nav-label { font-size: 14px; }
  .nav-tab.active { background: var(--color-primary-light); }
  .nav-tab:hover { background: var(--color-surface-alt); }

  /* ----- main content ----- */
  .app-main { padding-bottom: 24px; }
  .screen { padding: 32px 40px 8px; max-width: 900px; }

  /* ----- layouts that were single-column purely for phone width ----- */
  .root-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 14px;
  }
  .root-card-group-heading { grid-column: 1 / -1; }

  .roadmap-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .profile-stats-grid { grid-template-columns: repeat(6, 1fr); }

  .forest-scene { height: 400px; }
  .root-tree { max-width: 420px; }

  .onboarding-screen { max-width: 560px; margin: 0 auto; }
}