/* ============================================================
   base.css — Reset, Custom Properties, Typography, Theme System
   tgport.ru Design System
   ============================================================ */

/* --- 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;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: var(--font-base);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition:
    color var(--transition-theme),
    background-color var(--transition-theme);
}

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

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

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-heading);
  transition: color var(--transition-theme);
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

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

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

/* --- Font Stack --- */

:root {
  --font-base:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-heading:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    Arial, sans-serif;
  --font-mono:
    "Cascadia Code", "Fira Code", "JetBrains Mono", "SF Mono",
    "Consolas", "Liberation Mono", monospace;
}

/* --- Spacing Scale --- */

:root {
  --space-2xs: 0.25rem;
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
}

/* --- Typography Scale --- */

:root {
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-md:   1.125rem;
  --text-lg:   1.25rem;
  --text-xl:   1.5rem;
  --text-2xl:  1.875rem;
  --text-3xl:  2.25rem;
  --text-4xl:  3rem;
  --text-5xl:  3.75rem;
}

/* --- Border Radius --- */

:root {
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;
}

/* --- Transitions --- */

:root {
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-theme:  350ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --- Z-Index Scale --- */

:root {
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-overlay:   300;
  --z-modal:     400;
  --z-toast:     500;
  --z-tooltip:   600;
}

/* --- Shadows & Borders --- */

:root {
  --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:   0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg:   0 10px 15px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.04);
  --shadow-xl:   0 20px 25px rgba(0, 0, 0, 0.1), 0 8px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl:  0 25px 50px rgba(0, 0, 0, 0.15);
  --border-w:    1px;
}

/* ============================================================
   Light Theme (default) — :root
   Milky warm white, graphite text, coral/brick accent
   ============================================================ */

:root {
  /* Background */
  --color-bg:             #faf8f5;
  --color-bg-elevated:    #ffffff;
  --color-bg-sunken:      #f2efe9;
  --color-bg-overlay:     rgba(26, 26, 36, 0.5);

  /* Surface */
  --color-surface:        #ffffff;
  --color-surface-hover:  #f7f5f1;
  --color-surface-active: #f0ece6;

  /* Text */
  --color-text:           #2d2d3a;
  --color-text-secondary: #5a5a6e;
  --color-text-muted:     #8a8a9a;
  --color-text-inverse:   #faf8f5;
  --color-heading:        #1a1a24;

  /* Accent — red-coral / brick */
  --color-accent:         #c4453c;
  --color-accent-hover:   #a83830;
  --color-accent-subtle:  rgba(196, 69, 60, 0.08);
  --color-accent-muted:   rgba(196, 69, 60, 0.15);

  /* Secondary — steel blue */
  --color-secondary:        #4a7c9b;
  --color-secondary-hover:  #3d6a86;
  --color-secondary-subtle: rgba(74, 124, 155, 0.08);
  --color-secondary-muted:  rgba(74, 124, 155, 0.15);

  /* Borders */
  --color-border:         #e0ddd6;
  --color-border-hover:   #ccc8bf;
  --color-border-focus:   var(--color-accent);

  /* Status */
  --color-success:        #2e8b57;
  --color-success-bg:     rgba(46, 139, 87, 0.08);
  --color-success-border: rgba(46, 139, 87, 0.25);

  --color-warning:        #c48a1a;
  --color-warning-bg:     rgba(196, 138, 26, 0.08);
  --color-warning-border: rgba(196, 138, 26, 0.25);

  --color-danger:         #c4453c;
  --color-danger-bg:      rgba(196, 69, 60, 0.06);
  --color-danger-border:  rgba(196, 69, 60, 0.2);

  --color-info:           #4a7c9b;
  --color-info-bg:        rgba(74, 124, 155, 0.08);
  --color-info-border:    rgba(74, 124, 155, 0.25);

  --color-neutral:        #6b6b7b;
  --color-neutral-bg:     rgba(107, 107, 123, 0.08);
  --color-neutral-border: rgba(107, 107, 123, 0.2);

  /* Component-specific */
  --header-bg:            rgba(250, 248, 245, 0.85);
  --header-border:        var(--color-border);
  --card-bg:              var(--color-surface);
  --card-border:          var(--color-border);
  --card-shadow:          var(--shadow-sm);
  --card-shadow-hover:    var(--shadow-md);
  --input-bg:             var(--color-bg);
  --input-border:         var(--color-border);
  --input-focus-ring:     rgba(196, 69, 60, 0.2);
  --code-bg:              #f0ece6;
  --code-text:            #c4453c;
  --scrollbar-thumb:      #ccc8bf;
  --scrollbar-track:      transparent;
}

/* ============================================================
   Dark Theme — [data-theme="dark"]
   Premium near-black, graphite tones, warm highlights
   ============================================================ */

[data-theme="dark"] {
  /* Background */
  --color-bg:             #0c0c12;
  --color-bg-elevated:    #141420;
  --color-bg-sunken:      #08080d;
  --color-bg-overlay:     rgba(0, 0, 0, 0.65);

  /* Surface */
  --color-surface:        #16161f;
  --color-surface-hover:  #1e1e2a;
  --color-surface-active: #252533;

  /* Text */
  --color-text:           #c8c8d4;
  --color-text-secondary: #8e8ea0;
  --color-text-muted:     #5c5c6e;
  --color-text-inverse:   #0c0c12;
  --color-heading:        #e8e8f0;

  /* Accent — warm coral */
  --color-accent:         #d4574e;
  --color-accent-hover:   #e06b63;
  --color-accent-subtle:  rgba(212, 87, 78, 0.1);
  --color-accent-muted:   rgba(212, 87, 78, 0.2);

  /* Secondary — steel blue lighter */
  --color-secondary:        #6a9cba;
  --color-secondary-hover:  #7db0ce;
  --color-secondary-subtle: rgba(106, 156, 186, 0.1);
  --color-secondary-muted:  rgba(106, 156, 186, 0.18);

  /* Borders */
  --color-border:         #252535;
  --color-border-hover:   #353548;
  --color-border-focus:   var(--color-accent);

  /* Status */
  --color-success:        #3da86e;
  --color-success-bg:     rgba(61, 168, 110, 0.1);
  --color-success-border: rgba(61, 168, 110, 0.3);

  --color-warning:        #d4a03a;
  --color-warning-bg:     rgba(212, 160, 58, 0.1);
  --color-warning-border: rgba(212, 160, 58, 0.3);

  --color-danger:         #d4574e;
  --color-danger-bg:      rgba(212, 87, 78, 0.08);
  --color-danger-border:  rgba(212, 87, 78, 0.25);

  --color-info:           #6a9cba;
  --color-info-bg:        rgba(106, 156, 186, 0.1);
  --color-info-border:    rgba(106, 156, 186, 0.3);

  --color-neutral:        #7a7a8e;
  --color-neutral-bg:     rgba(122, 122, 142, 0.1);
  --color-neutral-border: rgba(122, 122, 142, 0.25);

  /* Component-specific */
  --header-bg:            rgba(12, 12, 18, 0.88);
  --header-border:        var(--color-border);
  --card-bg:              var(--color-surface);
  --card-border:          var(--color-border);
  --card-shadow:          0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --card-shadow-hover:    0 8px 16px rgba(0, 0, 0, 0.35), 0 4px 6px rgba(0, 0, 0, 0.2);
  --input-bg:             #111118;
  --input-border:         var(--color-border);
  --input-focus-ring:     rgba(212, 87, 78, 0.25);
  --code-bg:              #111118;
  --code-text:            #d4574e;
  --scrollbar-thumb:      #353548;
  --scrollbar-track:      transparent;

  --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md:   0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg:   0 10px 15px rgba(0, 0, 0, 0.35), 0 4px 6px rgba(0, 0, 0, 0.2);
  --shadow-xl:   0 20px 25px rgba(0, 0, 0, 0.4), 0 8px 10px rgba(0, 0, 0, 0.2);
  --shadow-2xl:  0 25px 50px rgba(0, 0, 0, 0.5);
}

/* --- Typography Helpers --- */

.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md   { font-size: var(--text-md); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }
.text-2xl  { font-size: var(--text-2xl); }
.text-3xl  { font-size: var(--text-3xl); }

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

.font-medium  { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold    { font-weight: 700; }

/* --- Scrollbar --- */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* --- Code --- */

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius-sm);
  transition:
    background var(--transition-theme),
    color var(--transition-theme);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  padding: var(--space-lg);
  background: var(--code-bg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  transition: background var(--transition-theme);
}

pre code {
  padding: 0;
  background: none;
}

/* --- Visibility Utilities --- */

.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; }

/* --- Theme transition on all themed elements --- */

.theme-transition,
.theme-transition *,
.theme-transition *::before,
.theme-transition *::after {
  transition:
    color var(--transition-theme),
    background-color var(--transition-theme),
    border-color var(--transition-theme),
    box-shadow var(--transition-theme),
    fill var(--transition-theme),
    stroke var(--transition-theme) !important;
}