/* ============================================================
   TYPE FLOW — main.css
   Foundation layer: reset, design tokens, typography, layout
   ============================================================ */

/* ============================================================
   1. MODERN CSS RESET
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Remove default focus ring, we'll add our own */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============================================================
   2. DESIGN TOKENS
   ============================================================ */

:root {
  /* ---------- Spacing scale (4px base) ---------- */
  --space-2xs: 0.25rem;   /*  4px */
  --space-xs:  0.5rem;    /*  8px */
  --space-sm:  0.75rem;   /* 12px */
  --space-md:  1rem;      /* 16px */
  --space-lg:  1.5rem;    /* 24px */
  --space-xl:  2rem;      /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-4xl: 6rem;      /* 96px */

  /* ---------- Radii ---------- */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* ---------- Typography ---------- */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;

  --text-2xs: 0.6875rem;  /* 11px */
  --text-xs:  0.75rem;    /* 12px */
  --text-sm:  0.875rem;   /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-md:  1.125rem;   /* 18px */
  --text-lg:  1.375rem;   /* 22px */
  --text-xl:  1.75rem;    /* 28px */
  --text-2xl: 2.25rem;    /* 36px */
  --text-3xl: 3rem;       /* 48px */
  --text-4xl: 4rem;       /* 64px */
  --text-5xl: 5.5rem;     /* 88px */

  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.12em;
  --tracking-widest: 0.2em;

  /* ---------- Timing / easing ---------- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-snap: cubic-bezier(0.4, 0, 0.2, 1);

  --duration-instant: 80ms;
  --duration-fast:    150ms;
  --duration-base:    220ms;
  --duration-slow:    350ms;
  --duration-slower:  500ms;

  /* ---------- Z-index scale ---------- */
  --z-base: 1;
  --z-sidebar: 50;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-drawer-overlay: 400;
  --z-drawer: 500;
  --z-modal-overlay: 600;
  --z-modal: 700;
  --z-command: 800;
  --z-toast: 900;
  --z-scanlines: 9999;

  /* ---------- Layout ---------- */
  --sidebar-width: 220px;
  --content-max-width: 900px;
  --content-wide-max-width: 1200px;

  /* ---------- Borders ---------- */
  --border-width: 1px;
  --border-width-thick: 2px;

  /* ---------- Colors (overridden by themes.css) ---------- */
  --bg: #0a0a0a;
  --bg-elevated: #121212;
  --surface: #161616;
  --surface-hover: #1c1c1c;
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.14);

  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-muted: #5a5a5a;
  --text-dim: #3a3a3a;

  --accent: #e2b714;
  --accent-hover: #f0c530;
  --accent-dim: rgba(226, 183, 20, 0.15);
  --accent-glow: rgba(226, 183, 20, 0.35);

  --error: #ef4444;
  --error-dim: rgba(239, 68, 68, 0.15);
  --success: #22c55e;
  --warning: #f59e0b;

  /* ---------- Shadows ---------- */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 24px var(--accent-glow);

  /* ---------- Transitions ---------- */
  --transition-base: var(--duration-base) var(--ease-out);
  --transition-fast: var(--duration-fast) var(--ease-out);
  --transition-slow: var(--duration-slow) var(--ease-out);
}

/* ============================================================
   3. BASE TYPOGRAPHY
   ============================================================ */

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--text-primary);
  background-color: var(--bg);
  letter-spacing: var(--tracking-normal);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-md); }
h6 { font-size: var(--text-base); }

code, kbd, pre, samp {
  font-family: var(--font-mono);
  font-size: 0.95em;
}

a {
  color: var(--accent);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

::selection {
  background-color: var(--accent);
  color: var(--bg);
}

/* ============================================================
   4. SCROLLBAR
   ============================================================ */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

/* ============================================================
   5. APP SHELL LAYOUT
   ============================================================ */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  min-height: 100dvh;
}

/* ============================================================
   6. SIDEBAR
   ============================================================ */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: var(--space-lg) var(--space-md);
  border-right: var(--border-width) solid var(--border);
  background-color: var(--bg-elevated);
  z-index: var(--z-sidebar);
  overflow-y: auto;
}

.sidebar__brand {
  margin-bottom: var(--space-2xl);
  padding: 0 var(--space-xs);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  transition: color var(--transition-fast);
}

.brand:hover {
  color: var(--accent);
}

.brand__logo {
  width: 28px;
  height: 28px;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.brand:hover .brand__logo {
  transform: rotate(-6deg) scale(1.05);
}

.brand__name {
  line-height: 1;
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-normal);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
  position: relative;
}

.nav-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 60%;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

.nav-item:hover {
  color: var(--text-primary);
  background-color: var(--surface);
}

.nav-item:hover::before {
  transform: translateY(-50%) scaleY(1);
}

.nav-item.active {
  color: var(--accent);
  background-color: var(--accent-dim);
}

.nav-item.active::before {
  transform: translateY(-50%) scaleY(1);
}

.nav-item__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.nav-item__label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.sidebar__footer {
  display: flex;
  gap: var(--space-xs);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  border-top: var(--border-width) solid var(--border);
}

/* ============================================================
   7. MAIN CONTENT AREA
   ============================================================ */

.main {
  min-width: 0;
  padding: var(--space-2xl) var(--space-xl);
  display: flex;
  flex-direction: column;
}

.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: var(--content-wide-max-width);
  width: 100%;
  margin: 0 auto;
  animation: page-fade-in var(--duration-base) var(--ease-out);
}

.page[hidden] {
  display: none;
}

.page__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: var(--content-max-width);
}

.page__title {
  font-family: var(--font-sans);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  line-height: var(--leading-tight);
}

.page__subtitle {
  font-size: var(--text-md);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 60ch;
}

/* ============================================================
   8. UTILITY CLASSES
   ============================================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent); }
.text-mono { font-family: var(--font-mono); }

/* ============================================================
   9. SHARED PRIMITIVES
   ============================================================ */

/* --- KBD --- */
.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5em;
  padding: 0.15em 0.45em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--surface);
  border: var(--border-width) solid var(--border);
  border-bottom-width: 2px;
  border-radius: var(--radius-xs);
  line-height: 1;
  letter-spacing: 0;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.kbd + .kbd {
  margin-left: 2px;
}

/* --- Skeleton --- */
.skeleton {
  color: var(--text-dim) !important;
  letter-spacing: 0.15em;
  animation: skeleton-pulse 2s var(--ease-in-out) infinite;
  user-select: none;
  pointer-events: none;
}

/* --- Skeleton chart bars --- */
.skeleton-chart {
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  gap: 4px;
  height: 100%;
  padding: 0 var(--space-md);
}

.skeleton-bar {
  flex: 1;
  max-width: 40px;
  background: var(--border);
  border-radius: var(--radius-xs) var(--radius-xs) 0 0;
  animation: skeleton-pulse 2s var(--ease-in-out) infinite;
}

/* --- Empty state --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-3xl) var(--space-lg);
  text-align: center;
}

.empty-state__icon {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  color: var(--text-dim);
  letter-spacing: 0.3em;
}

.empty-state__text {
  color: var(--text-muted);
  font-size: var(--text-sm);
  max-width: 40ch;
}

/* --- Link --- */
.link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast);
}

.link:hover {
  text-decoration-color: var(--accent);
}

/* --- Scanline overlay --- */
.scanline-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--z-scanlines);
  opacity: 0;
  transition: opacity var(--transition-slow);
  background: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.025) 0px,
    rgba(255, 255, 255, 0.025) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
}

.scanline-overlay.active {
  opacity: 1;
}

/* --- Toast container --- */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: var(--z-toast);
  pointer-events: none;
  max-width: min(400px, calc(100vw - var(--space-xl)));
}

/* --- Mobile input (hidden but focusable for virtual keyboards) --- */
.mobile-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  height: 0;
  width: 0;
  top: 0;
  left: 0;
}

/* ============================================================
   10. KEYFRAMES (base ones — more in animations.css)
   ============================================================ */

@keyframes page-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 0.8; }
}

/* ============================================================
   11. RESPONSIVE
   ============================================================ */

/* Tablet: collapse sidebar labels */
@media (max-width: 900px) {
  :root {
    --sidebar-width: 68px;
  }

  .sidebar {
    padding: var(--space-md) var(--space-xs);
    align-items: center;
  }

  .sidebar__brand {
    margin-bottom: var(--space-xl);
    padding: 0;
  }

  .brand__name {
    display: none;
  }

  .nav-item {
    justify-content: center;
    padding: var(--space-sm);
  }

  .nav-item__label {
    display: none;
  }

  .sidebar__footer {
    flex-direction: column;
    align-items: center;
  }
}

/* Mobile: sidebar becomes bottom bar */
@media (max-width: 640px) {
  :root {
    --sidebar-width: 0;
  }

  .app {
    grid-template-columns: 1fr;
    padding-bottom: 72px; /* space for bottom nav */
  }

  .sidebar {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    height: auto;
    width: 100%;
    flex-direction: row;
    padding: var(--space-xs) var(--space-md);
    border-right: none;
    border-top: var(--border-width) solid var(--border);
    overflow: visible;
    align-items: center;
    justify-content: space-between;
    backdrop-filter: blur(12px);
    background-color: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  }

  .sidebar__brand {
    display: none;
  }

  .sidebar__nav {
    flex-direction: row;
    flex: 1;
    justify-content: space-around;
    gap: 0;
  }

  .nav-item {
    flex-direction: column;
    gap: 2px;
    padding: var(--space-xs);
    font-size: var(--text-2xs);
    border-radius: var(--radius-sm);
  }

  .nav-item::before {
    display: none;
  }

  .nav-item__label {
    display: block;
    font-size: var(--text-2xs);
  }

  .sidebar__footer {
    padding-top: 0;
    margin-top: 0;
    border-top: none;
    gap: var(--space-2xs);
  }

  .main {
    padding: var(--space-lg) var(--space-md);
  }

  .page__title {
    font-size: var(--text-2xl);
  }

  .page__subtitle {
    font-size: var(--text-base);
  }

  .toast-container {
    top: auto;
    bottom: calc(72px + var(--space-md));
    right: var(--space-md);
    left: var(--space-md);
    max-width: none;
  }
}

/* Small phones */
@media (max-width: 400px) {
  .main {
    padding: var(--space-md) var(--space-sm);
  }

  .page__title {
    font-size: var(--text-xl);
  }
}

/* ============================================================
   12. PREFERS-REDUCED-MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .skeleton,
  .skeleton-bar {
    animation: none !important;
    opacity: 0.5;
  }
}

/* Manual reduce-motion (toggled via settings) */
html[data-reduce-motion="true"] *,
html[data-reduce-motion="true"] *::before,
html[data-reduce-motion="true"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

/* ============================================================
   13. PRINT
   ============================================================ */

@media print {
  .sidebar,
  .scanline-overlay,
  .toast-container,
  .modal-overlay,
  .drawer,
  .drawer-overlay {
    display: none !important;
  }

  .app {
    grid-template-columns: 1fr;
  }

  body {
    background: white;
    color: black;
  }
}