/* ========================================================================
   Kraviora Base Styles (base.css)
   Dark, racing, cinematic, energetic, premium, high-contrast
   ======================================================================== */

/* ========================================================================
   1. CSS Variables (Design Tokens)
   ======================================================================== */
:root {
  /* Colors */
  --color-background: #050507; /* deep black */
  --color-surface: #101015; /* dark surface */
  --color-surface-alt: #16161f; /* alt panels */
  --color-text: #f5f5f7;
  --color-text-muted: #9b9ca5;
  --color-border-subtle: #262633;

  --color-primary: #ff1631; /* racing red */
  --color-primary-soft: rgba(255, 22, 49, 0.16);
  --color-primary-strong: #ff0020;

  --color-success: #3dd68c;
  --color-warning: #ffb020;
  --color-danger: #ff3b3b;

  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #111827;
  --color-gray-900: #020308;

  /* Racing / Atmosphere accents */
  --color-asphalt: #15151e;
  --color-graphite: #1f1f29;
  --color-carbon: #14141d;
  --color-track-line: #ffffff;
  --color-neon-red: #ff003c;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Oswald", "Impact", system-ui, sans-serif;

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */

  --line-height-tight: 1.15;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-7: 1.75rem;  /* 28px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 18px;
  --radius-pill: 999px;

  /* Shadows (subtle glow + depth) */
  --shadow-soft: 0 12px 30px rgba(0, 0, 0, 0.55);
  --shadow-strong: 0 22px 60px rgba(0, 0, 0, 0.85);
  --shadow-glow-red: 0 0 24px rgba(255, 0, 60, 0.6);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 260ms ease-out;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding-x: 1.25rem;

  /* Z-index layers */
  --z-header: 40;
  --z-overlay: 50;
  --z-modal: 60;
}

/* Motion preferences */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
  }
}

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

html,
body {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-sans);
}

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

img {
  border-style: none;
}

button,
input,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

textarea {
  resize: vertical;
}

/* Remove default list styles globally (per project requirement) */
ul {
  list-style: none !important;
  padding-left: 0;
  margin: 0;
}

ol {
  padding-left: 1.25rem;
  margin: 0;
}

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

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  padding: 0;
}

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

/* ========================================================================
   3. Base Typography & Layout
   ======================================================================== */
body {
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

p {
  margin-top: 0;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

strong,
b {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

/* Headings – bold, condensed, cinematic */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.5rem, 5vw, var(--font-size-5xl));
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 3.2vw, var(--font-size-4xl));
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 2.6vw, var(--font-size-3xl));
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

/* Links – subtle, turn red on hover */
a {
  transition: color var(--transition-base),
    text-shadow var(--transition-base),
    background-size var(--transition-fast);
}

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

/* ========================================================================
   4. Accessibility & Focus Styles
   ======================================================================== */
:focus {
  outline: none;
}

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

/* Screen-reader only utility */
.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;
}

/* ========================================================================
   5. Layout Utilities & Helpers
   ======================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section--tight {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

/* Flex utilities */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

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

.gap-2 {
  gap: var(--space-2);
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

/* Grid utilities for responsive sections */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

.text-right {
  text-align: right;
}

.m-auto {
  margin: auto;
}

.mt-4 {
  margin-top: var(--space-4);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-6 {
  margin-bottom: var(--space-6);
}

.py-8 {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

/* Diagonal / racing-inspired helper (for sections, cards, strips) */
.angle-top {
  position: relative;
}

.angle-top::before {
  content: "";
  position: absolute;
  top: -24px;
  left: 0;
  right: 0;
  height: 24px;
  background: linear-gradient(135deg, transparent 40%, rgba(255, 255, 255, 0.08) 50%, transparent 60%);
  opacity: 0.4;
  pointer-events: none;
}

/* ========================================================================
   6. Navigation & Hero helpers
   ======================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: radial-gradient(circle at top, rgba(255, 0, 60, 0.14), transparent 55%)
    , rgba(5, 5, 7, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.nav-list {
  display: none;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link {
  position: relative;
  padding-block: var(--space-1);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-neon-red));
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* Burger / nav toggle – must be column per requirements */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 999px;
  background: #ffffff;
  transition: transform var(--transition-base), opacity var(--transition-base),
    background-color var(--transition-base);
}

@media (min-width: 960px) {
  .nav-toggle {
    display: none;
  }
  .nav-list {
    display: flex;
  }
}

/* Centered hero composition */
.hero {
  position: relative;
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero__inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 2px var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: radial-gradient(circle at 0 0, rgba(255, 0, 60, 0.35), transparent 55%)
    , rgba(10, 10, 16, 0.96);
  font-size: var(--font-size-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-6);
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.hero-tag {
  padding: 2px var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Background overlays: lights, speed lines, etc. */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(255, 0, 60, 0.3), transparent 60%)
    , radial-gradient(circle at 0% 100%, rgba(255, 255, 255, 0.06), transparent 55%)
    , radial-gradient(circle at 100% 100%, rgba(255, 0, 60, 0.32), transparent 55%);
  opacity: 0.9;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      113deg,
      rgba(255, 255, 255, 0.04) 0,
      transparent 10%,
      transparent 90%,
      rgba(255, 255, 255, 0.04) 100%
    );
  mix-blend-mode: soft-light;
  opacity: 0.7;
  pointer-events: none;
}

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

/* ========================================================================
   7. Buttons (Base component)
   ======================================================================== */
.btn {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-strong);
  --btn-color: #ffffff;
  --btn-border: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.8rem 1.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-border);
  background: radial-gradient(circle at 10% 0, rgba(255, 255, 255, 0.2), transparent 40%)
    , var(--btn-bg);
  color: var(--btn-color);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: background-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast),
    color var(--transition-base);
  box-shadow: var(--shadow-soft);
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.4), transparent 60%);
  mix-blend-mode: screen;
  opacity: 0;
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.btn:hover {
  background-color: var(--btn-bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-red);
}

.btn:hover::after {
  opacity: 0.35;
  transform: translateX(6%);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-soft);
}

.btn--outline {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(255, 22, 49, 0.14);
  --btn-color: #ffffff;
  --btn-border: rgba(255, 255, 255, 0.38);
  box-shadow: none;
}

.btn--ghost {
  --btn-bg: rgba(255, 255, 255, 0.04);
  --btn-bg-hover: rgba(255, 255, 255, 0.08);
  --btn-color: var(--color-text);
  --btn-border: transparent;
  box-shadow: none;
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-xs);
}

.btn[disabled],
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.btn:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 3px;
}

/* ========================================================================
   8. Form Controls (Inputs, Textareas, Selects)
   ======================================================================== */
.form-control {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(10, 10, 16, 0.96);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition: border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

.form-control:focus {
  border-color: var(--color-neon-red);
  box-shadow: 0 0 0 1px rgba(255, 0, 60, 0.6);
  background-color: #141420;
}

.form-control[aria-invalid="true"],
.form-control--invalid {
  border-color: var(--color-danger);
}

.form-label {
  display: inline-block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.form-helper {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

/* ========================================================================
   9. Card Component – racing panel
   ======================================================================== */
.card {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.02), transparent 40%),
    radial-gradient(circle at 0 0, rgba(255, 0, 60, 0.3), transparent 50%),
    var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 5px
    );
  mix-blend-mode: soft-light;
  opacity: 0.6;
  pointer-events: none;
}

.card__header {
  margin-bottom: var(--space-3);
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-1);
}

.card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.card--glow-red {
  border-color: rgba(255, 0, 60, 0.6);
  box-shadow: var(--shadow-glow-red);
}

/* Hover lift utility for cards / tiles */
.tile-hover {
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.tile-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-strong);
  border-color: rgba(255, 255, 255, 0.16);
}

/* ========================================================================
   10. Racing / Visual Identity Utilities
   ======================================================================== */
/* Checkered flag strip (for dividers or badges) */
.checkered-strip {
  position: relative;
  height: 10px;
  background-image: linear-gradient(45deg, #ffffff 25%, transparent 25%),
    linear-gradient(-45deg, #ffffff 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ffffff 75%),
    linear-gradient(-45deg, transparent 75%, #ffffff 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0px;
  opacity: 0.34;
}

/* Track-inspired horizontal divider */
.track-divider {
  position: relative;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
  overflow: visible;
}

.track-divider::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 50%;
  width: 80px;
  height: 5px;
  transform: translateX(-50%) skewX(-18deg);
  background: linear-gradient(90deg, var(--color-primary), var(--color-neon-red));
  box-shadow: 0 0 18px rgba(255, 0, 60, 0.7);
}

/* Speed streak overlay (for sections or images) */
.speed-streaks {
  position: relative;
  overflow: hidden;
}

.speed-streaks::after {
  content: "";
  position: absolute;
  inset: -40%;
  background-image: linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.18) 0,
      transparent 20%,
      transparent 80%,
      rgba(255, 255, 255, 0.18) 100%
    );
  mix-blend-mode: soft-light;
  opacity: 0.35;
  pointer-events: none;
}

/* Oversized numeric labels */
.metric-number {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 7vw, 4rem);
  line-height: 0.9;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #ffffff;
}

.metric-label {
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Dark overlay helper for background images */
.overlay-dark {
  position: relative;
}

.overlay-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0, rgba(0, 0, 0, 0.4), transparent 55%)
    , linear-gradient(180deg, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.9));
  pointer-events: none;
}

/* ========================================================================
   11. Media Queries – global responsive tweaks
   ======================================================================== */
@media (max-width: 767.98px) {
  .section {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }

  h1 {
    letter-spacing: 0.08em;
  }

  .card {
    padding: var(--space-4);
  }
}

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