/* Shared theme + UI primitives (Classic+ default, Cyber-Luthier optional).
   Keeps legacy CSS variable names used across the current static pages. */

:root {
  /* Typography */
  --font-body: "Spline Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    sans-serif;
  --font-display: var(--font-body);
  /* Classic keeps a familiar sans feel; Cyber can opt into the serif reading font. */
  --font-reading: var(--font-body);
  /* Accent font used sparingly (small labels / HUD). */
  --font-accent: var(--font-mono);
  --font-mono: "Azeret Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;

  /* Core tokens (Classic+, light) */
  --bg: #fcfbf8;
  --surface: #ffffff;
  --panel: #f6f4ef;
  --text: #16181d;
  --muted: #5b6473;
  --border: #e6e1d6;

  --accent: #3b82f6;
  --accent-2: #b7772a;
  --success: #16a34a;
  --danger: #dc2626;

  --shadow-lg: 0 18px 50px rgba(14, 18, 28, 0.12);
  --shadow-sm: 0 10px 24px rgba(14, 18, 28, 0.1);

  /* Glass surfaces (used by floating controls/nav) */
  --glass-bg: rgba(255, 255, 255, 0.74);
  --glass-bg-strong: rgba(255, 255, 255, 0.88);

  /* Legacy mappings (app) */
  --bg-light: var(--bg);
  --bg-panel: var(--panel);
  --text-dark: var(--text);
  --text-light: var(--muted);
  --border-color: var(--border);
  --accent-color: var(--accent);
  --accent-color-translucent: rgba(59, 130, 246, 0.3);

  /* Legacy mappings (blog/posts) */
  --bg-app: var(--bg);
  --bg-surface: var(--surface);
  --border-subtle: rgba(22, 24, 29, 0.12);
  --accent-primary: var(--accent);
  --text-primary: var(--text);
  --text-secondary: var(--muted);

  /* Layout helpers */
  --appbar-space: calc(5.25rem + env(safe-area-inset-top, 0px)); /* JS can refine */
}

/* Dark mode (supports both data-attr and existing `.dark` usage) */
html[data-mode="dark"],
html.dark,
body.dark {
  --bg: #0b0f17;
  --surface: #0f172a;
  --panel: #111b2c;
  --text: #eef2ff;
  --muted: #a5b0c3;
  --border: #23324a;

  --accent: #60a5fa;
  --accent-color-translucent: rgba(96, 165, 250, 0.32);

  --glass-bg: rgba(15, 23, 42, 0.7);
  --glass-bg-strong: rgba(15, 23, 42, 0.86);

  --border-subtle: rgba(238, 242, 255, 0.12);
}

/* Cyber-Luthier style (opt-in) */
html[data-style="cyber"],
body.cyber {
  /* Keep typography consistent (no "shock"), use accent font for cyber flavor. */
  --font-display: var(--font-body);
  --font-reading: var(--font-body);
  --font-accent: "Chakra Petch", ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", sans-serif;

  /* Light cyber keeps the "blue feel" but adds brass as a secondary accent */
  --bg: #f7f2e8;
  --surface: #fff9ee;
  --panel: #efe3cf;
  --text: #0f141b;
  --muted: #556275;
  --border: #dcc7a0;

  --accent: #0077a8;
  --accent-2: #e0a84a;
  --accent-color-translucent: rgba(0, 119, 168, 0.22);

  --glass-bg: rgba(255, 249, 238, 0.7);
  --glass-bg-strong: rgba(255, 249, 238, 0.86);

  --border-subtle: rgba(15, 20, 27, 0.14);
}

html[data-style="cyber"][data-mode="dark"],
html.dark[data-style="cyber"],
body.dark.cyber {
  --bg: #070a0f;
  --surface: #0b121c;
  --panel: #0d1623;
  --text: #e9f0ff;
  --muted: #9aa9bd;
  --border: #1d2a3b;

  --accent: #00d1ff;
  --accent-2: #e0a84a;
  --accent-color-translucent: rgba(0, 209, 255, 0.26);

  --glass-bg: rgba(13, 22, 35, 0.72);
  --glass-bg-strong: rgba(13, 22, 35, 0.88);

  --border-subtle: rgba(233, 240, 255, 0.12);
}

/* Base */
html {
  color-scheme: light;
  scroll-behavior: smooth;
}

html[data-mode="dark"],
html.dark {
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

* {
  box-sizing: border-box;
}

*:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Cyber background atmosphere (kept subtle to avoid "theme shock") */
html[data-style="cyber"] body {
  background:
    radial-gradient(1100px 700px at 14% -10%, rgba(0, 209, 255, 0.14), transparent
          56%),
    radial-gradient(900px 600px at 110% 10%, rgba(224, 168, 74, 0.1),
        transparent 52%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 38%),
    var(--bg);
}

html[data-style="cyber"] body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.65'/%3E%3C/svg%3E");
}

/* Component-only texture (use it on panels/cards, not the whole page). */
.cyber-grid {
  position: relative;
  isolation: isolate;
}

html[data-style="cyber"] .cyber-grid::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  opacity: 0.22;
  mix-blend-mode: overlay;
  z-index: 0;
  /* Blueprint-style dot grid (avoids the "full-width stripes" feel). */
  background:
    radial-gradient(circle at 1px 1px, rgba(0, 209, 255, 0.22) 1px, transparent
          1.6px)
      0 0 / 34px 34px,
    radial-gradient(circle at 1px 1px, rgba(224, 168, 74, 0.14) 1px, transparent
          1.6px)
      17px 17px / 34px 34px;
}

.cyber-grid > * {
  position: relative;
  z-index: 1;
}

/* Shared floating nav (blog/faq/posts) */
.nav-controls {
  position: fixed;
  top: calc(1rem + env(safe-area-inset-top, 0px));
  left: calc(1rem + env(safe-area-inset-left, 0px));
  right: calc(1rem + env(safe-area-inset-right, 0px));
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  pointer-events: none;
}

.nav-controls > * {
  pointer-events: auto;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-sm);
}

.nav-btn:hover {
  border-color: rgba(0, 0, 0, 0);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0), 0 14px 40px rgba(0, 0, 0, 0.12);
  transform: translateY(-1px);
}

html[data-mode="dark"] .nav-btn:hover,
html.dark .nav-btn:hover {
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0), 0 18px 54px rgba(0, 0, 0, 0.55);
}

/* App floating controls (index.html) */
#floating-controls {
  position: fixed;
  top: calc(1rem + env(safe-area-inset-top, 0px));
  left: calc(1rem + env(safe-area-inset-left, 0px));
  right: calc(1rem + env(safe-area-inset-right, 0px));
  z-index: 101;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.controls-left,
.controls-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.controls-right {
  justify-content: flex-end;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease,
    border-color 160ms ease, background-color 160ms ease;
}

.control-btn:hover {
  transform: translateY(-1px);
}

.control-btn--support {
  border-color: rgba(0, 209, 255, 0.35);
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.12), var(--shadow-sm);
}

/* Metronome toggle (index.html) */
#metronome-row {
  margin-top: 0.75rem;
}

.metronome-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--glass-bg-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  font-weight: 900;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease,
    border-color 160ms ease, background-color 160ms ease;
}

.metronome-toggle:hover {
  transform: translateY(-1px);
}

.metronome-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 35%, transparent),
    var(--shadow-sm);
}

.metronome-toggle::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--muted) 55%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--border) 70%, transparent);
}

.metronome-toggle__meta {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  padding-left: 0.65rem;
  border-left: 1px solid var(--border);
  color: var(--muted);
  letter-spacing: 0.05em;
}

.metronome-toggle.is-running {
  border-color: color-mix(in srgb, var(--danger) 60%, var(--border) 40%);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--danger) 62%, var(--surface) 38%),
    var(--glass-bg-strong)
  );
}

.metronome-toggle.is-running::before {
  background: var(--danger);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--danger) 18%, transparent);
  animation: metronomePulse 900ms ease-in-out infinite;
}

@keyframes metronomePulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.85;
  }
  50% {
    transform: scale(1.25);
    opacity: 1;
  }
}

/* App: tighten the main training loop spacing a bit (helps desktop and mobile). */
#fretboard-container {
  padding-bottom: 1.75rem;
}

#answer-options {
  margin-top: 1.5rem;
}

/* Cyber tweaks: make the mode feel "active" without changing layout. */
html[data-style="cyber"] .control-btn {
  border-color: color-mix(in srgb, var(--border) 68%, var(--accent) 32%);
  background: linear-gradient(
    180deg,
    rgba(255, 249, 238, 0.88),
    rgba(255, 249, 238, 0.66)
  );
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.1), var(--shadow-sm);
}

html[data-style="cyber"] .control-btn--support {
  border-color: color-mix(in srgb, var(--border) 40%, var(--accent-2) 60%);
  box-shadow: 0 0 0 1px rgba(224, 168, 74, 0.14), var(--shadow-sm);
}

html[data-style="cyber"] .control-btn,
html[data-style="cyber"] .blog-tag {
  font-family: var(--font-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

html[data-style="cyber"][data-mode="dark"] .control-btn,
html.dark[data-style="cyber"] .control-btn {
  background: linear-gradient(
    180deg,
    rgba(11, 18, 28, 0.72),
    rgba(11, 18, 28, 0.52)
  );
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.14), var(--shadow-sm);
}

/* App: give Cyber-Luthier some extra punch beyond "slightly cream". */
html[data-style="cyber"] .switcher-btn.active {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-2));
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.16), 0 18px 50px rgba(0, 0, 0, 0.12);
}

html[data-style="cyber"][data-mode="dark"] .switcher-btn.active,
html.dark[data-style="cyber"] .switcher-btn.active {
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.18), 0 22px 70px rgba(0, 0, 0, 0.6);
}

html[data-style="cyber"] #side-panel {
  border-right-color: color-mix(in srgb, var(--border) 62%, var(--accent) 38%);
}

html[data-style="cyber"] #side-panel h2,
html[data-style="cyber"] #side-panel h3 {
  font-family: var(--font-accent);
  letter-spacing: 0.08em;
}

html[data-style="cyber"] #fretboard {
  border-color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 62%, var(--text) 38%);
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.12), var(--shadow-lg);
}

html[data-style="cyber"] .marker-dot {
  background-color: var(--accent-2);
  background-color: color-mix(in srgb, var(--panel) 68%, var(--accent-2) 32%);
  box-shadow: 0 0 0 1px rgba(224, 168, 74, 0.18);
}

html[data-style="cyber"] #next-btn,
html[data-style="cyber"] #stats-btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 0 0 1px rgba(0, 209, 255, 0.12), var(--shadow-sm);
}

/* Shared headline helpers (used by blog/faq) */
.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.hero-subtitle {
  color: var(--text-secondary);
}

/* Simple page layout primitives (avoid Tailwind dependency on content pages) */
.page-shell {
  width: 100%;
  padding-top: 6rem;
  padding-bottom: 4rem;
}

.page-inner {
  width: min(100% - 2rem, 60rem);
  margin: 0 auto;
}

.page-inner--wide {
  width: min(100% - 2rem, 72rem);
}

.page-hero {
  text-align: center;
  margin-bottom: 3rem;
}

.page-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6vw, 3.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 0.85rem;
}

.page-title--gradient {
  color: var(--text-primary);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-title--gradient {
    background: linear-gradient(
      90deg,
      var(--text-primary),
      var(--accent-primary)
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
  }
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 1.08rem;
  line-height: 1.55;
  margin: 0 auto;
  max-width: 44rem;
}

.page-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

@media (min-width: 720px) {
  .page-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .page-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
  }
}

/* FAQ page */
.faq-container {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.faq-container details {
  border: 1px solid var(--border);
  background: var(--glass-bg-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  padding: 14px 16px;
}

.faq-container summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  list-style: none;
}

.faq-container summary::-webkit-details-marker {
  display: none;
}

.faq-container summary::after {
  content: "+";
  float: right;
  color: var(--accent-primary);
}

.faq-container details[open] summary::after {
  content: "-";
}

.faq-container p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 10px;
}

.page-footer {
  margin-top: 3rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.page-footer a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.kofi-link {
  display: inline-block;
  margin-top: 1.15rem;
  opacity: 0.86;
  transition: opacity 180ms ease;
}

.kofi-link:hover {
  opacity: 1;
}

/* Mobile safety: keep controls reachable and avoid layout shifts */
@media (max-width: 520px) {
  #floating-controls {
    left: calc(0.75rem + env(safe-area-inset-left, 0px));
    right: calc(0.75rem + env(safe-area-inset-right, 0px));
    top: calc(0.75rem + env(safe-area-inset-top, 0px));
  }

  .controls-right {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .controls-right::-webkit-scrollbar {
    display: none;
  }

  .control-btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.82rem;
  }

  #metronome-row {
    margin-top: 0.4rem;
  }

  .metronome-toggle {
    padding: 0.45rem 0.75rem;
    font-size: 0.82rem;
  }

  .metronome-toggle__meta {
    font-size: 0.72rem;
    padding-left: 0.55rem;
  }

  /* App: reduce vertical clutter on phones */
  #stats-btn {
    display: none !important;
  }

  #stats-display {
    display: none !important;
  }

  #trainer-header {
    margin-bottom: 0.65rem;
  }

  #trainer-title {
    font-size: 1.55rem;
    line-height: 1.15;
  }

  #trainer-subtitle {
    display: none;
  }

  /* Tighten the switchers so answers can stay in-view. */
  #trainer-header [aria-label="Training Mode"] {
    margin-top: 0.65rem !important;
  }

  #view-switcher-container [aria-label="View Mode"] {
    margin-top: 0.45rem !important;
  }

  #fretboard-container {
    margin-top: 0.55rem;
    padding-bottom: 0.6rem;
  }

  #fretboard {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
  }

  #fretboard .fret {
    height: 2.35rem;
  }

  #answer-options {
    /* 4 options = 1 row on phones (keeps the learning loop above the fold). */
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 0.55rem;
    gap: 0.55rem;
  }

  #answer-options button {
    padding: 0.55rem 0.35rem;
    font-size: 0.95rem;
    min-height: 44px; /* keep touch targets usable */
    border-radius: 14px;
  }

  #feedback {
    margin-top: 1rem !important;
    font-size: 1.25rem;
    min-height: 1.75rem;
    height: auto;
  }

  /* Make the mode/view "option pickers" feel more app-like on small screens. */
  [aria-label="Training Mode"],
  [aria-label="View Mode"],
  #practice-mode-container [aria-label="Practice Mode"],
  #technique-mode-container [aria-label="Technique Exercise"] {
    max-width: 100% !important;
    padding: 0.4rem !important;
    border-radius: 14px;
  }

  [aria-label="Training Mode"] .switcher-btn,
  [aria-label="View Mode"] .switcher-btn,
  #practice-mode-container .switcher-btn,
  #technique-mode-container .switcher-btn {
    padding: 0.5rem 0.55rem !important;
    font-size: 0.85rem;
    line-height: 1.15;
    white-space: nowrap;
  }

  [aria-label="View Mode"] .switcher-btn {
    font-size: 0.78rem;
  }
}

@media (max-width: 360px) {
  /* Ultra-narrow: go back to 2 columns so labels don't get cramped. */
  #answer-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metronome-toggle__meta {
    display: none;
  }
}