/* =============================================================================
   1. CUSTOM PROPERTIES
   ============================================================================= */
:root {
  /* --- Brand colours --- */
  --color-brand-base: #00d4ff;
  --color-brand-light: #66e5ff;
  --color-brand-dark: #007a99;
  --color-brand-muted: rgba(0, 212, 255, 0.15);

  /* --- Background & Surfaces --- */
  --color-bg: #050505;
  --color-surface: #0f0f11;
  --color-surface-2: #161619;
  --color-surface-3: #1e1e22;
  --color-border: #222226;
  --color-border-hover: #333339;

  /* --- Text Colours --- */
  --color-text: #f0f0f0;
  --color-text-muted: #9999a1;
  --color-text-subtle: #66666e;

  /* --- Typography --- */
  --font-family: "Geist", "Inter", system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-md: 1.125rem; /* 18px */
  --font-size-lg: 1.25rem; /* 20px */
  --font-size-xl: 1.5rem; /* 24px */
  --font-size-2xl: 2rem; /* 32px */
  --font-size-3xl: 2.5rem; /* 40px */
  --font-size-4xl: 3.5rem; /* 56px */

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.1;
  --line-height-snug: 1.3;
  --line-height-base: 1.6;

  /* --- Spacing --- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 5rem;
  --space-16: 8rem;

  /* --- Layout --- */
  --max-width: 1100px;
  --header-height: 70px;

  /* --- Radius --- */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* --- Transitions --- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* =============================================================================
     2. RESET & BASE
     ============================================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-base);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul {
  list-style: none;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}
img {
  display: block;
  max-width: 100%;
}

/* Accessibility Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

.skip-link {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-2) var(--space-4);
  background: var(--color-brand-base);
  color: var(--color-bg);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-md);
  transform: translateY(-200%);
  transition: transform var(--transition-base);
}
.skip-link:focus {
  transform: translateY(0);
}

/* =============================================================================
     3. UTILITIES & LAYOUT
     ============================================================================= */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}
@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

.section-padding {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
@media (min-width: 768px) {
  .section-padding {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }
}

/* Mesh Background for Noir Feel */
.mesh-bg {
  position: relative;
}
.mesh-bg::before {
  content: "";
  position: absolute;
  background: var(--color-brand-dark);
  border-radius: 100%;
  z-index: -1;
  pointer-events: none;
  filter: blur(120px);
}
@media (min-width: 640px) {
  .mesh-bg::before {
    filter: blur(200px);
  }
}
@media (min-width: 768px) {
  .mesh-bg::before {
    filter: blur(250px);
  }
}
.mesh-bg--hero::before {
  width: 40vw;
  height: 75vh;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
}
.mesh-bg--split::before {
  width: 40vw;
  height: 60vh;
  top: 0;
  left: 25%;
  transform: translate(-50%, -20%);
}
@media (min-width: 768px) {
  .mesh-bg--split::before {
    width: 60vw;
    height: 60vh;
    top: 50%;
    left: 0;
    transform: translate(-50%, -50%);
  }
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, var(--color-brand-base) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* =============================================================================
     4. COMPONENTS
     ============================================================================= */
/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}
.button--sm {
  padding: var(--space-2) var(--space-4);
}
.button--primary {
  background-color: var(--color-brand-base);
  color: #000;
}
.button--primary:hover {
  background-color: var(--color-brand-light);
  box-shadow: 0 0 15px var(--color-brand-muted);
}
.button--outline {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.button--outline:hover {
  border-color: var(--color-text);
  background-color: var(--color-surface);
}
.button--white {
  background-color: var(--color-text);
  color: var(--color-bg);
}
.button--white:hover {
  background-color: #e0e0e0;
}

/* Icons */
.icon--play {
  width: 0;
  height: 0;
  border-radius: 0;
  display: inline-block;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid currentColor;
}

/* =============================================================================
     5. HEADER
     ============================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(5, 5, 5, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header__brand {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}
.site-header__nav {
  display: none;
}
@media (min-width: 768px) {
  .site-header__nav {
    display: block;
  }
}
.site-header__nav-list {
  display: flex;
  gap: var(--space-6);
}
.site-header__nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}
.site-header__nav-link:hover {
  color: var(--color-text);
}

/* =============================================================================
     6. HERO SECTION
     ============================================================================= */
.hero {
  text-align: center;
  overflow: hidden;
}
.hero__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}
.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.03em;
}
@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
}
.hero__subtitle {
  color: var(--color-text-muted);
  max-width: 600px;
  font-size: var(--font-size-md);
}
.hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-2);
}
.hero__media {
  flex: 1;
  min-width: 0;
  max-width: 880px;
  width: 100%;
  margin-inline: auto;
  padding-top: var(--space-8);
}

@media (min-width: 768px) {
  .hero__media {
    padding-top: var(--space-12);
  }
}

/* =============================================================================
   7. VIDEO PLAYER COMPONENT
   ============================================================================= */

.video-player {
  position: relative;
  width: 100%;
}

/* Hidden checkbox toggle */
.video-player__toggle {
  display: none;
}

.video-player__placeholder {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-dim);
}

/* Brand color overlay */
.video-player:not(:has(.video-player__toggle:checked))
  .video-player__placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 212, 255, 0.25),
    rgba(0, 122, 153, 0.35)
  );
  mix-blend-mode: color;
  pointer-events: none;
}

/* Thumb placeholder (replace with <img>) */
.video-player__thumb-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    var(--color-surface-2) 0%,
    var(--color-surface-3) 50%,
    var(--color-surface-2) 100%
  );
}

/* Play button (label) */
.video-player__play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.video-player__play-icon {
  width: 64px;
  height: 64px;
  color: var(--color-brand-base);
  filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.5));
  transition:
    transform var(--transition-base),
    filter var(--transition-base);
  flex-shrink: 0;
}

.video-player__play-btn:hover .video-player__play-icon {
  transform: scale(1.08);
  filter: drop-shadow(0 0 32px rgba(0, 212, 255, 0.75));
}

.video-player__play-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Embed: hidden by default, shown when toggle checked */
.video-player__embed {
  display: none;
  position: absolute;
  inset: 0;
}

.video-player__embed iframe {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-xl);
}

.video-player:has(.video-player__toggle:checked)
  .video-player__placeholder
  .video-player__play-btn {
  opacity: 0;
  pointer-events: none;
}

.video-player:has(.video-player__toggle:checked)
  .video-player__placeholder
  .video-player__embed {
  display: block;
}

/* Decorative corner brackets */
.video-player__corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--color-brand-light);
  border-style: solid;
  border-width: 0;
}

.video-player__corner--tl {
  top: -6px;
  left: -6px;
  border-top-width: 2px;
  border-left-width: 2px;
  border-top-left-radius: var(--radius-sm);
}

.video-player__corner--tr {
  top: -6px;
  right: -6px;
  border-top-width: 2px;
  border-right-width: 2px;
  border-top-right-radius: var(--radius-sm);
}

.video-player__corner--bl {
  bottom: -6px;
  left: -6px;
  border-bottom-width: 2px;
  border-left-width: 2px;
  border-bottom-left-radius: var(--radius-sm);
}

.video-player__corner--br {
  bottom: -6px;
  right: -6px;
  border-bottom-width: 2px;
  border-right-width: 2px;
  border-bottom-right-radius: var(--radius-sm);
}

/* =============================================================================
     8. TEXT SPLIT SECTION
     ============================================================================= */
.split-section__container {
  display: grid;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .split-section__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
    align-items: center;
  }
}
.split-section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}
@media (min-width: 768px) {
  .split-section__title {
    font-size: var(--font-size-4xl);
  }
}
.split-section__content {
  font-size: var(--font-size-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.split-section__content p:not(:first-child) {
  color: var(--color-text-muted);
}

/* =============================================================================
     9. FEATURE GRID
     ============================================================================= */
.feature-grid {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.grid--3 {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}
.feature-card {
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition:
    transform var(--transition-base),
    border-color var(--transition-base);
}
.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-brand-dark);
}
.feature-card__icon {
  width: 40px;
  height: 40px;
  background-color: rgba(0, 212, 255, 0.1);
  color: var(--color-brand-base);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}
.feature-card__title {
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}
.feature-card__desc {
  color: var(--color-text-subtle);
  font-size: var(--font-size-sm);
}

/* =============================================================================
     10. BOTTOM CTA
     ============================================================================= */
.cta-banner {
  background: linear-gradient(
    135deg,
    var(--color-brand-dark) -50%,
    #001a22 100%
  );
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-4);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(0, 212, 255, 0.15) 0%,
    transparent 60%
  );
  pointer-events: none;
}
.cta-banner__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: #fff;
  margin-bottom: var(--space-2);
  position: relative;
}
.cta-banner__desc {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-6);
  position: relative;
}
.cta-banner__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  position: relative;
  flex-wrap: wrap;
}

/* =============================================================================
     11. FOOTER
     ============================================================================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  color: var(--color-text-subtle);
  font-size: var(--font-size-sm);
}
.site-footer__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}
@media (min-width: 768px) {
  .site-footer__container {
    flex-direction: row;
    justify-content: space-between;
  }
}
.site-footer__links {
  display: flex;
  gap: var(--space-4);
}
.site-footer__links a:hover {
  color: var(--color-text);
}