/* ===== DESIGN TOKENS ===== */
:root {
  /* Type scale */
  --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);

  /* Spacing */
  --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;

  /* Layout */
  --content-default: 1100px;
  --content-narrow: 680px;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

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

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* ===== DARK MODE (default) ===== */
:root, [data-theme="dark"] {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #1c2330;
  --color-surface-offset: #21262d;
  --color-border: #30363d;
  --color-divider: #21262d;

  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-text-faint: #484f58;

  --color-primary: #0e9aaa;
  --color-primary-hover: #0b8999;
  --color-primary-active: #076f80;
  --color-primary-highlight: rgba(14, 154, 170, 0.12);

  --color-accent-glow: rgba(14, 154, 170, 0.18);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(14, 154, 170, 0.15);
}

/* ===== LIGHT MODE ===== */
[data-theme="light"] {
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3f7;
  --color-surface-offset: #e8ecf0;
  --color-border: #d0d7de;
  --color-divider: #e4e8ed;

  --color-text: #1a2030;
  --color-text-muted: #5a6575;
  --color-text-faint: #9ca8b5;

  --color-primary: #0b7a87;
  --color-primary-hover: #096e79;
  --color-primary-active: #076068;
  --color-primary-highlight: rgba(11, 122, 135, 0.1);

  --color-accent-glow: rgba(11, 122, 135, 0.08);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.14);
  --shadow-glow: 0 0 40px rgba(11, 122, 135, 0.08);
}

/* ===== 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-20);
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s, color 0.3s;
}

img, svg { display: block; max-width: 100%; }
ul[role="list"] { list-style: none; }
input, button, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; }
::selection { background: var(--color-primary-highlight); color: var(--color-text); }
: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;
  }
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-10); }
}

/* ===== TYPOGRAPHY ===== */
.section-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.1;
}

.section-header { margin-bottom: var(--space-12); }
.section-header--center { text-align: center; }
.section-header--center p { max-width: unset; }

.highlight {
  color: var(--color-primary);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 0 var(--color-primary-active), var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 3px 0 var(--color-primary-active), var(--shadow-md);
  transform: translateY(-1px);
}
.btn--primary:active {
  background: var(--color-primary-active);
  box-shadow: 0 1px 0 var(--color-primary-active);
  transform: translateY(1px);
}

.btn--amazon {
  background: #8a5200;
  color: #fff;
  box-shadow: 0 2px 0 #5a3500, var(--shadow-sm);
}
.btn--amazon:hover {
  background: #7a4800;
  box-shadow: 0 3px 0 #5a3500, var(--shadow-md);
  transform: translateY(-1px);
}
.btn--amazon:active {
  box-shadow: 0 1px 0 #5a3500;
  transform: translateY(1px);
}

.feature-amazon-wrap {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  padding: var(--space-4) 0 var(--space-2);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
  border-color: var(--color-text-faint);
}

.btn--sm {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
}
.btn--lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
}

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.3s, border-color 0.3s;
}
.header--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.logo__text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.tm {
  font-size: 0.5em;
  font-weight: 600;
  vertical-align: super;
  color: var(--color-primary);
  letter-spacing: 0;
  margin-left: 1px;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  margin-left: auto;
}
.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.nav__link:hover { color: var(--color-text); }

.nav__cta { margin-left: var(--space-4); }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  transition: background var(--transition-interactive), color var(--transition-interactive);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

@media (max-width: 680px) {
  .nav { display: none; }
  .header__inner { gap: var(--space-4); }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(var(--space-16), 8vw, var(--space-24)) 0 0;
  min-height: 85vh;
  display: flex;
  flex-direction: column;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-divider) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-divider) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, black 20%, transparent 100%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-bottom: var(--space-16);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-highlight);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 14ch;
  margin-bottom: var(--space-6);
}

.hero__sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.6;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.hero__trust {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.trust-badge svg { color: var(--color-primary); flex-shrink: 0; }

/* ===== PHONE MOCKUP ===== */
.hero__phone-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 0 var(--space-6) 0;
  margin-top: var(--space-8);
}

@media (min-width: 900px) {
  .hero {
    flex-direction: row;
    align-items: flex-start;
  }
  .hero__inner {
    flex: 1;
    max-width: 600px;
    padding-top: var(--space-8);
    padding-bottom: var(--space-24);
  }
  .hero__phone-wrap {
    position: absolute;
    right: clamp(var(--space-6), 5vw, var(--space-16));
    top: 50%;
    transform: translateY(-50%) perspective(1000px) rotateY(-6deg) rotateX(3deg);
    margin-top: 0;
    padding: 0;
  }
}

.phone-mockup {
  width: 280px;
  background: var(--color-surface);
  border-radius: 36px;
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-lg), var(--shadow-glow), inset 0 1px 0 rgba(255,255,255,0.06);
  overflow: hidden;
  padding: var(--space-3);
}

.phone-screen {
  background: var(--color-bg);
  border-radius: 28px;
  padding: var(--space-4);
  min-height: 420px;
}

.phone-topbar {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: var(--space-4);
}
.phone-appname {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.phone-vin-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}
.phone-vin-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}
.phone-vin-code {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}
.phone-vehicle {
  font-size: 0.65rem;
  color: var(--color-text-muted);
}

.phone-parts-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.phone-part-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
}
.phone-part-name {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.phone-part-oem {
  font-size: 0.62rem;
  color: var(--color-text-muted);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: var(--space-2);
}
.phone-part-btns {
  display: flex;
  gap: var(--space-2);
}
.phone-btn {
  flex: 1;
  text-align: center;
  padding: 4px 6px;
  border-radius: 6px;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.phone-btn--amazon {
  background: #e8a126;
  color: #1a0a00;
}
.phone-btn--ebay {
  background: #1476cc;
  color: #fff;
}

/* ===== SECTIONS ===== */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-24)) 0;
}

/* ===== FEATURES ===== */
.features { background: var(--color-surface); }

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 600px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.feature-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.feature-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ===== HOW IT WORKS ===== */
.how-it-works { background: var(--color-bg); }

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--space-8);
  align-items: flex-start;
  padding: var(--space-8) 0;
}

.step-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  opacity: 0.6;
  padding-top: var(--space-1);
}

.step-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.step-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 60ch;
}

.step-divider {
  height: 1px;
  background: var(--color-divider);
  margin: 0 0 0 calc(72px + var(--space-8));
}

@media (min-width: 768px) {
  .steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    align-items: start;
  }
  .step {
    grid-template-columns: 1fr;
    padding: 0 var(--space-8);
    border-right: 1px solid var(--color-divider);
    border-bottom: none;
  }
  .step:last-child { border-right: none; }
  .step-number {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-5);
  }
  .step-divider { display: none; }
}

/* ===== ABOUT ===== */
.about { background: var(--color-surface); }

.about__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16);
}
@media (min-width: 900px) {
  .about__inner { grid-template-columns: 1fr 1fr; align-items: start; }
}

.about__body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-5);
  max-width: 60ch;
}

.about__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.about__list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  font-weight: 500;
}
.about__list svg { color: var(--color-primary); flex-shrink: 0; }

.about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--transition-interactive);
}
.stat-card:hover { border-color: var(--color-primary); }

.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ===== CONTACT ===== */
.contact { background: var(--color-bg); }

.contact__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin: var(--space-4) auto 0;
  line-height: 1.6;
}

.contact-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: var(--space-10);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
@media (min-width: 600px) {
  .contact-cards { grid-template-columns: repeat(3, 1fr); }
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-decoration: none;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
a.contact-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-sm);
  transform: translateY(-2px);
}

.contact-card__icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-card__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.contact-card__value {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.5;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: flex-start;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: unset;
}

.footer__nav {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
}
.footer__link:hover { color: var(--color-text); }

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  width: 100%;
  max-width: unset;
}

@media (min-width: 768px) {
  .footer__copy { text-align: right; width: auto; }
}