/* =========================================
   Variables
   ========================================= */
:root {
  /* Color scheme */
  color-scheme: dark;

  /* Core palette: gritty, high-contrast, cinematic */
  --color-bg: #0b0d10;            /* near-black, steel-tinted */
  --color-surface: #14181d;       /* low-elevation surface */
  --color-elevated: #1b2128;      /* elevated surface */
  --color-overlay: rgba(0, 0, 0, 0.6);

  --color-text: #e6e6e6;
  --color-text-muted: #b3b9c5;

  --color-primary: #d90429;       /* blood red */
  --color-accent: #ff6a00;        /* molten orange */
  --color-success: #22c55e;
  --color-warning: #f97316;
  --color-danger: #b91c1c;        /* darker danger to distinguish from primary */
  --color-on-primary: #ffffff;

  /* Neutral grays */
  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --border-color: #222831;        /* subtle steel border */
  --divider-color: #1a1f25;
  --color-focus: var(--color-accent);

  /* Typography */
  --font-display: "Oswald", "Bebas Neue", Impact, Haettenschweiler, "Arial Narrow Bold", "Franklin Gothic Heavy", "Segoe UI", Roboto, system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-sans: Inter, "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui, -apple-system, sans-serif;

  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-lg: 18px;
  --fs-xl: 20px;
  --fs-2xl: 24px;
  --fs-3xl: 30px;
  --fs-4xl: 36px;
  --fs-5xl: 48px;
  --fs-6xl: 60px;

  --lh-tight: 1.1;
  --lh-snug: 1.25;
  --lh-normal: 1.6;
  --lh-loose: 1.8;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;
  --space-96: 96px;

  /* Radii */
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-round: 9999px;

  /* Shadows (cinematic, gritty) */
  --shadow-sm: 0 1px 1px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.02) inset;
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.04) inset;
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.06) inset;
  --shadow-glow: 0 0 0 2px rgba(217, 4, 41, 0.4), 0 8px 24px rgba(217, 4, 41, 0.35), 0 0 40px rgba(255, 106, 0, 0.2);

  /* Transitions */
  --duration-fast: 120ms;
  --duration-normal: 200ms;
  --duration-slow: 320ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* Layout */
  --container-max: 1200px;
}

/* =========================================
   Reset / Normalize
   ========================================= */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

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; padding: 0; }

/* Improve text rendering */
html, body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }

/* =========================================
   Base Styles
   ========================================= */
body {
  min-height: 100dvh;
  background: radial-gradient(1200px 600px at 10% -10%, rgba(255, 106, 0, 0.06), transparent 60%),
              radial-gradient(1000px 800px at 110% 10%, rgba(217, 4, 41, 0.07), transparent 60%),
              var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
}

::selection { background: rgba(217, 4, 41, 0.35); color: #fff; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: 0.02em;
  color: var(--color-text);
}

h1 { font-size: clamp(var(--fs-4xl), 5vw, var(--fs-6xl)); margin-block: var(--space-24) var(--space-16); text-transform: uppercase; letter-spacing: 0.04em; }

h2 { font-size: clamp(var(--fs-3xl), 3.5vw, var(--fs-5xl)); margin-block: var(--space-24) var(--space-12); text-transform: uppercase; letter-spacing: 0.04em; }

h3 { font-size: clamp(var(--fs-2xl), 2.2vw, var(--fs-4xl)); margin-block: var(--space-20) var(--space-8); text-transform: uppercase; }

h4 { font-size: var(--fs-xl); margin-block: var(--space-16) var(--space-8); }

h5 { font-size: var(--fs-lg); margin-block: var(--space-12) var(--space-6); }

h6 { font-size: var(--fs-sm); margin-block: var(--space-8) var(--space-4); letter-spacing: 0.06em; }

p { margin-block: var(--space-12); color: var(--color-text); }

small { font-size: var(--fs-sm); color: var(--color-text-muted); }

hr { border: 0; border-top: 1px solid var(--divider-color); margin-block: var(--space-24); }

a { color: var(--color-primary); text-decoration: none; text-underline-offset: 2px; }

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

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

/* =========================================
   Utilities
   ========================================= */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(var(--space-16), 4vw, var(--space-32));
}

.center { margin-inline: auto; }

.stack { display: flex; flex-direction: column; gap: var(--space-16); }

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-8); }
.gap-md { gap: var(--space-16); }
.gap-lg { gap: var(--space-24); }

.grid { display: grid; gap: var(--space-16); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

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

/* =========================================
   Components
   ========================================= */
/* Buttons */
.btn {
  --_bg: var(--color-primary);
  --_fg: var(--color-on-primary);
  display: inline-flex;
  align-items: center; justify-content: center;
  gap: var(--space-8);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: linear-gradient(180deg, color-mix(in oklab, var(--_bg) 92%, black), var(--_bg));
  color: var(--_fg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  line-height: 1;
  box-shadow: var(--shadow-md);
  transition: transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-normal) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard),
              border-color var(--duration-normal) var(--ease-standard),
              color var(--duration-normal) var(--ease-standard);
  cursor: pointer;
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg), var(--shadow-glow); }

.btn:active { transform: translateY(0); }

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

.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.6; cursor: not-allowed; filter: grayscale(10%); }

.btn--primary { --_bg: var(--color-primary); --_fg: var(--color-on-primary); }
.btn--accent  { --_bg: var(--color-accent);  --_fg: #111; color: #111!important; }
.btn--success { --_bg: var(--color-success); --_fg: #041507; }
.btn--warning { --_bg: var(--color-warning); --_fg: #1b0f03; }
.btn--danger  { --_bg: var(--color-danger);  --_fg: #fff; }

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--border-color);
  box-shadow: none;
}

.btn--ghost:hover { border-color: color-mix(in oklab, var(--color-primary) 60%, var(--border-color)); color: var(--color-primary); box-shadow: var(--shadow-sm); }

/* Inputs */
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
select, textarea, .input {
  width: 100%;
  padding: 10px 12px;
  background-color: var(--color-elevated);
  color: var(--color-text);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--duration-normal) var(--ease-standard),
              box-shadow var(--duration-normal) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard);
}

input::placeholder, textarea::placeholder { color: color-mix(in oklab, var(--color-text) 55%, black); opacity: 0.7; }

input:focus-visible, select:focus-visible, textarea:focus-visible, .input:focus-visible {
  outline: none;
  border-color: color-mix(in oklab, var(--color-primary) 70%, var(--border-color));
  box-shadow: 0 0 0 2px rgba(255, 106, 0, 0.3), 0 0 0 4px rgba(217, 4, 41, 0.25);
}

fieldset { border: 1px solid var(--divider-color); border-radius: var(--radius-sm); padding: var(--space-16); }
legend { padding: 0 var(--space-8); font-weight: 700; font-family: var(--font-display); letter-spacing: 0.04em; }

/* Card */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--divider-color);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  box-shadow: var(--shadow-md);
}

.card--elevated { background-color: var(--color-elevated); box-shadow: var(--shadow-lg); }

/* Links as buttons (utility) */
.a-btn { display: inline-block; text-decoration: none; }

/* =========================================
   Accessibility
   ========================================= */
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* =========================================
   Additional Touches
   ========================================= */
/* Subtle borders for content sections */
.section { border-top: 1px solid var(--divider-color); padding-block: var(--space-32); }

/* Muted text helper */
.muted { color: var(--color-text-muted); }

/* Emphasized tone for DOOM feel on headings */
.heading-accent { color: var(--color-accent); }

/* Strong visual divider */
.rule { height: 2px; background: linear-gradient(90deg, transparent, var(--color-primary) 30%, var(--color-accent) 70%, transparent); border: 0; }