/* === ART DIRECTION ===
   Concept: Motorsport calendar tool → precision, speed, dark weekend atmosphere
   Palette: Dark surfaces (asphalt/carbon), red accent (racing red), neutral grays
   Typography: Cabinet Grotesk (display, bold, condensed – race program feel) + General Sans (body, precise)
   Density: Balanced — editorial sections breathe, feature grid is dense
*/

/* ===== TOKENS ===== */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3.5rem, 1rem + 7vw, 8.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  --font-display: "Cabinet Grotesk", sans-serif;
  --font-body: "General Sans", sans-serif;
}

/* Dark (primary) theme */
[data-theme="dark"] {
  --color-bg: #0e0d0c;
  --color-surface: #141312;
  --color-surface-2: #1a1918;
  --color-surface-offset: #201f1d;
  --color-surface-dynamic: #2a2927;
  --color-divider: #2e2d2b;
  --color-border: #363432;
  --color-text: #e8e6e3;
  --color-text-muted: #8a8885;
  --color-text-faint: #525150;
  --color-text-inverse: #0e0d0c;
  --color-primary: #e8201c;
  --color-primary-hover: #f53530;
  --color-primary-active: #c41a17;
  --color-primary-highlight: #2d1a19;
  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.35);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.45);
  --shadow-lg: 0 16px 48px oklch(0 0 0 / 0.55);
}

[data-theme="light"] {
  --color-bg: #f5f4f2;
  --color-surface: #f9f8f6;
  --color-surface-2: #ffffff;
  --color-surface-offset: #eceae7;
  --color-surface-dynamic: #e3e1de;
  --color-divider: #d8d6d3;
  --color-border: #cccac7;
  --color-text: #1a1917;
  --color-text-muted: #6e6c69;
  --color-text-faint: #aaa9a6;
  --color-text-inverse: #f5f4f2;
  --color-primary: #c41a17;
  --color-primary-hover: #a81511;
  --color-primary-active: #8a0f0d;
  --color-primary-highlight: #fdecea;
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #f5f4f2;
    --color-surface: #f9f8f6;
    --color-surface-2: #ffffff;
    --color-surface-offset: #eceae7;
    --color-surface-dynamic: #e3e1de;
    --color-divider: #d8d6d3;
    --color-border: #cccac7;
    --color-text: #1a1917;
    --color-text-muted: #6e6c69;
    --color-text-faint: #aaa9a6;
    --color-text-inverse: #f5f4f2;
    --color-primary: #c41a17;
    --color-primary-hover: #a81511;
    --color-primary-active: #8a0f0d;
    --color-primary-highlight: #fdecea;
    --shadow-sm: 0 1px 2px oklch(0.2 0.01 80/0.06);
    --shadow-md: 0 4px 12px oklch(0.2 0.01 80/0.08);
    --shadow-lg: 0 12px 32px oklch(0.2 0.01 80/0.12);
  }
}

/* ===== BASE ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}
body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}
img,
picture,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}
ul[role="list"] {
  list-style: none;
}
input,
button,
select {
  font: inherit;
  color: inherit;
}
h1,
h2,
h3,
h4 {
  text-wrap: balance;
  line-height: 1.1;
}
p,
li {
  text-wrap: pretty;
  max-width: 72ch;
}
::selection {
  background: color-mix(in oklch, var(--color-primary) 25%, transparent);
}
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
button {
  cursor: pointer;
  background: none;
  border: none;
}
a,
button,
[role="button"] {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
}
.container--narrow {
  max-width: var(--content-default);
}

/* ===== HEADER / NAV ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-12));
  background: color-mix(in oklch, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.logo svg {
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-interactive);
}
.nav-links a:hover {
  color: var(--color-text);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  white-space: nowrap;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 16px color-mix(in oklch, var(--color-primary) 45%, transparent);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid oklch(from var(--color-text) l c h / 0.15);
}
.btn-ghost:hover {
  color: var(--color-text);
  border-color: oklch(from var(--color-text) l c h / 0.3);
}
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid oklch(from var(--color-text) l c h / 0.15);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  color: var(--color-text);
  border-color: oklch(from var(--color-text) l c h / 0.3);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--color-bg);
}
/* racing flag grid pattern */
.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      oklch(from var(--color-text) l c h / 0.025) 0px,
      oklch(from var(--color-text) l c h / 0.025) 1px,
      transparent 1px,
      transparent 60px
    ),
    repeating-linear-gradient(
      90deg,
      oklch(from var(--color-text) l c h / 0.025) 0px,
      oklch(from var(--color-text) l c h / 0.025) 1px,
      transparent 1px,
      transparent 60px
    );
}
/* accent glow top-right */
.hero-bg::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 55%;
  padding-bottom: 55%;
  border-radius: 50%;
  background: radial-gradient(
    ellipse at center,
    color-mix(in oklch, var(--color-primary) 12%, transparent) 0%,
    transparent 70%
  );
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  padding: clamp(var(--space-16), 10vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12));
  max-width: var(--content-wide);
  margin-inline: auto;
  width: 100%;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}
.hero-eyebrow::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}
.hero-heading {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-8);
}
.hero-heading em {
  font-style: normal;
  color: var(--color-primary);
}
.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 300;
  max-width: 52ch;
  line-height: 1.5;
  margin-bottom: var(--space-10);
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-16);
}
.btn-lg {
  padding: 0.75rem 2rem;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}
.hero-stats {
  display: flex;
  gap: clamp(var(--space-8), 5vw, var(--space-20));
  padding-top: var(--space-8);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.1);
  flex-wrap: wrap;
}
.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

/* ===== SCREENSHOT SECTION ===== */
.screenshot-section {
  padding: clamp(var(--space-16), 8vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12));
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}
.screenshot-wrap {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  box-shadow:
    var(--shadow-lg),
    0 0 80px color-mix(in oklch, var(--color-primary) 10%, transparent);
}
.screenshot-wrap img {
  width: 100%;
  height: auto;
  display: block;
}
.screenshot-caption {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ===== SECTION SHARED ===== */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-24)) clamp(var(--space-4), 4vw, var(--space-12));
}
.section-label {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.section-label::before {
  content: "";
  display: block;
  width: 16px;
  height: 2px;
  background: var(--color-primary);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: var(--space-6);
}
.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  line-height: 1.7;
}

/* ===== SERIES SECTION ===== */
.series-section {
  background: var(--color-bg);
}
.series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(180px, 100%), 1fr));
  gap: var(--space-3);
  margin-top: var(--space-12);
}
.series-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition:
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    color var(--transition-interactive);
}
.series-card:hover {
  background: var(--color-surface-2);
  border-color: oklch(from var(--color-text) l c h / 0.18);
  color: var(--color-text);
}
.series-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ===== FEATURES ===== */
.features-section {
  background: var(--color-surface);
}
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-12);
}
.feature-card {
  padding: var(--space-8) var(--space-8);
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: box-shadow var(--transition-interactive);
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
}
.feature-card--wide {
  grid-column: 1 / -1;
}
.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}
.feature-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1;
}
.feature-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* === CARD WITH WIDE LAYOUT === */
.feature-card--wide-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
.feature-mockup {
  background: var(--color-surface-offset);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.mock-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
}
.mock-flag {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.mock-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  flex: 1;
}
.mock-badge {
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: color-mix(in oklch, var(--color-primary) 20%, var(--color-surface));
  color: var(--color-primary);
}
.mock-badge--muted {
  background: oklch(from var(--color-text) l c h / 0.06);
  color: var(--color-text-faint);
}

/* ===== ICS SECTION ===== */
.ics-section {
  background: var(--color-bg);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.07);
}
.ics-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-20));
  align-items: center;
}
.cal-apps {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-8);
}
.cal-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid oklch(from var(--color-text) l c h / 0.12);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}
.ics-mockup {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.ics-mockup-header {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-offset);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}
.ics-events {
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.ics-event {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}
.ics-event--alt {
  border-left-color: #3b82f6;
}
.ics-event--alt2 {
  border-left-color: #f59e0b;
}
.ics-event-date {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1;
  color: var(--color-text);
  min-width: 36px;
  text-align: center;
}
.ics-event-month {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ics-event-info {
  flex: 1;
}
.ics-event-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.ics-event-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ===== CTA SECTION ===== */
.cta-section {
  padding: clamp(var(--space-20), 10vw, var(--space-32)) clamp(var(--space-4), 4vw, var(--space-12));
  text-align: center;
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 60vw;
  height: 60vw;
  max-width: 700px;
  max-height: 700px;
  border-radius: 50%;
  background: radial-gradient(
    ellipse at center,
    color-mix(in oklch, var(--color-primary) 8%, transparent) 0%,
    transparent 70%
  );
  pointer-events: none;
}
.cta-heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 0.95;
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}
.cta-sub {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 46ch;
  margin: 0 auto var(--space-10);
  position: relative;
  z-index: 1;
  font-weight: 300;
}
.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: var(--space-12) clamp(var(--space-4), 4vw, var(--space-12));
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.07);
  background: var(--color-bg);
}
.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition-interactive);
}
.footer-links a:hover {
  color: var(--color-text-muted);
}
.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card--wide {
    grid-column: 1;
  }
  .feature-card--wide-inner {
    grid-template-columns: 1fr;
  }
  .ics-inner {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    gap: var(--space-8);
  }
}
@media (max-width: 480px) {
  .hero-ctas {
    flex-direction: column;
    align-items: flex-start;
  }
  .btn-lg {
    width: 100%;
    justify-content: center;
  }
}

/* ===== SCROLL ANIMATION ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 {
  transition-delay: 0.1s;
}
.reveal-delay-2 {
  transition-delay: 0.2s;
}
.reveal-delay-3 {
  transition-delay: 0.3s;
}