/* ========================================
   WHEELPILOT — Design Tokens
   Fintech palette: deep navy + gold/amber accent
   ======================================== */

: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;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'Clash Display', 'Helvetica Neue', sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

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

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* Light Mode */
:root, [data-theme="light"] {
  --color-bg: #f8f9fc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f3f8;
  --color-surface-offset: #e8ebf2;
  --color-divider: #d5d9e3;
  --color-border: #c5c9d6;

  --color-text: #0f1729;
  --color-text-muted: #5a6178;
  --color-text-faint: #9198ab;

  --color-accent: #d4940a;
  --color-accent-hover: #b87e07;
  --color-accent-light: #fdf4e0;

  --color-primary-dark: #0c1a2e;
  --color-primary-mid: #162d50;

  --shadow-sm: 0 1px 3px rgba(15, 23, 41, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 41, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 41, 0.12);
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0a0f1c;
  --color-surface: #111827;
  --color-surface-2: #1a2234;
  --color-surface-offset: #151d2f;
  --color-divider: #1f2a3f;
  --color-border: #2a3550;

  --color-text: #e2e6ef;
  --color-text-muted: #8891a6;
  --color-text-faint: #4f5872;

  --color-accent: #f0b429;
  --color-accent-hover: #f7c948;
  --color-accent-light: #1f1a0e;

  --color-primary-dark: #060a14;
  --color-primary-mid: #0d1525;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a0f1c;
    --color-surface: #111827;
    --color-surface-2: #1a2234;
    --color-surface-offset: #151d2f;
    --color-divider: #1f2a3f;
    --color-border: #2a3550;
    --color-text: #e2e6ef;
    --color-text-muted: #8891a6;
    --color-text-faint: #4f5872;
    --color-accent: #f0b429;
    --color-accent-hover: #f7c948;
    --color-accent-light: #1f1a0e;
    --color-primary-dark: #060a14;
    --color-primary-mid: #0d1525;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  }
}

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

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-divider) 50%, transparent);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.header__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.logo__icon {
  color: var(--color-accent);
  flex-shrink: 0;
}

.logo__text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-interactive);
}

.nav-link:hover {
  color: var(--color-text);
}

.cta-link {
  color: var(--color-accent);
}

.cta-link:hover {
  color: var(--color-accent-hover);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* ========================================
   Hero
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 15, 28, 0.55) 0%,
    rgba(10, 15, 28, 0.75) 50%,
    rgba(10, 15, 28, 0.92) 100%
  );
}

[data-theme="light"] .hero__overlay,
:root:not([data-theme]) .hero__overlay {
  background: linear-gradient(
    180deg,
    rgba(12, 26, 46, 0.5) 0%,
    rgba(12, 26, 46, 0.7) 45%,
    rgba(12, 26, 46, 0.6) 65%,
    rgba(248, 249, 252, 0.95) 100%
  );
}

[data-theme="light"] .hero__title,
:root:not([data-theme]) .hero__title {
  color: #ffffff;
}

[data-theme="light"] .hero__subtitle,
:root:not([data-theme]) .hero__subtitle {
  color: #d0d6e2;
}

[data-theme="light"] .hero__note,
:root:not([data-theme]) .hero__note {
  color: #a0aabe;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 760px;
  padding: var(--space-32) var(--space-6) var(--space-16);
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}

[data-theme="dark"] .hero__title,
:root:not([data-theme]) .hero__title {
  color: #ffffff;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 580px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

[data-theme="dark"] .hero__subtitle,
:root:not([data-theme]) .hero__subtitle {
  color: #b0b8cc;
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.hero__note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

[data-theme="light"] .hero__note,
:root:not([data-theme]) .hero__note {
  color: rgba(255,255,255,0.7);
  text-shadow: 0 1px 6px rgba(0,0,0,0.5);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  transition: all var(--transition-interactive);
  border: 1.5px solid transparent;
  cursor: pointer;
}

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

.btn--primary {
  background: var(--color-accent);
  color: #0f1729;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] .btn--ghost,
:root:not([data-theme]) .btn--ghost {
  color: #e2e6ef;
  border-color: rgba(255,255,255,0.2);
}

.btn--ghost:hover {
  background: var(--color-surface-2);
  border-color: var(--color-text-muted);
  transform: translateY(-1px);
}

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

/* ========================================
   Section Shared
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.section-eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  max-width: 680px;
  margin: 0 auto;
}

/* ========================================
   Features
   ======================================== */
.features {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-bg);
}

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

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--color-accent) 30%, var(--color-divider));
}

.feature-card--highlight {
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-divider));
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-accent-light) 100%);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-5);
  color: var(--color-accent);
}

.feature-card__icon svg {
  width: 100%;
  height: 100%;
}

.feature-card__title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

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

/* ========================================
   How It Works
   ======================================== */
.how-it-works {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-surface-2);
}

.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  max-width: 960px;
  margin: 0 auto;
}

.step {
  flex: 1;
  text-align: center;
  padding: 0 var(--space-6);
}

.step__number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  line-height: 1;
}

.step__title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.step__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 100%;
}

.step__connector {
  width: 60px;
  flex-shrink: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), color-mix(in srgb, var(--color-accent) 30%, transparent));
  margin-top: 28px;
  border-radius: 1px;
}

/* ========================================
   Teaser
   ======================================== */
.teaser {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-primary-dark);
  color: #e2e6ef;
}

.teaser__content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.teaser__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: #ffffff;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.teaser__desc {
  font-size: var(--text-base);
  color: #a0aabe;
  max-width: 600px;
  margin: 0 auto var(--space-12);
  line-height: 1.7;
}

.teaser__stats {
  display: flex;
  justify-content: center;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat__number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-2);
}

[data-theme="light"] .stat__number {
  color: #d4940a;
}

.stat__label {
  font-size: var(--text-xs);
  color: #8891a6;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  max-width: 180px;
}

/* ========================================
   Signup
   ======================================== */
.signup {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-bg);
}

.signup__inner {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.signup__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.signup__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.signup__form {
  width: 100%;
}

.signup__input-wrap {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.signup__input {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: var(--text-base);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.signup__input::placeholder {
  color: var(--color-text-faint);
}

.signup__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 15%, transparent);
}

.signup__btn {
  flex-shrink: 0;
  white-space: nowrap;
}

.signup__privacy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.signup__success[hidden] {
  display: none;
}

.signup__success {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: #437a22;
  padding: var(--space-6);
}

[data-theme="dark"] .signup__success {
  color: #6daa45;
}

.signup__success p {
  font-size: var(--text-lg);
  font-weight: 500;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-divider);
}

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

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__attr {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__attr:hover {
  color: var(--color-text-muted);
}

/* ========================================
   Scroll Animations — JS-driven IntersectionObserver
   ======================================== */
.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.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 900px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    flex-direction: column;
    align-items: center;
    gap: var(--space-8);
  }

  .step__connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-accent), color-mix(in srgb, var(--color-accent) 30%, transparent));
    margin-top: 0;
  }

  .step {
    padding: 0;
  }
}

@media (max-width: 640px) {
  .header__nav .nav-link:not(.cta-link) {
    display: none;
  }

  .hero__content {
    padding: var(--space-24) var(--space-4) var(--space-12);
  }

  .hero__title {
    font-size: clamp(2rem, 1rem + 5vw, 3rem);
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .signup__input-wrap {
    flex-direction: column;
  }

  .teaser__stats {
    flex-direction: column;
    gap: var(--space-6);
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
}