/* ============================================================
   f2b-dashboard Landing Page
   Modern light mode with forest-green accent
   Supports dark theme via [data-theme="dark"]
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #fafaf9;
  --bg-secondary: #f2f2ef;
  --bg-card: #ffffff;
  --bg-code: #111827;
  --bg-dark-accent: #0f172a;

  --text-primary: #111827;
  --text-secondary: #57534e;
  --text-muted: #a8a29e;
  --text-inverse: #ffffff;

  --accent: #166534;
  --accent-hover: #14532d;
  --accent-light: rgba(22, 101, 52, 0.08);
  --accent-glow: rgba(22, 101, 52, 0.25);

  --hero-log-color: rgba(17, 24, 39, 0.06);
  --hero-log-accent: rgba(22, 101, 52, 0.10);
  --hero-log-notice: rgba(87, 83, 78, 0.06);

  --border: #e7e5e4;
  --border-light: #f5f5f4;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --max-width: 1200px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-card: #1c1f2e;
  --bg-code: #0b0f19;
  --bg-dark-accent: #0b0d14;

  --text-primary: #e8eaf0;
  --text-secondary: #a1a1aa;
  --text-muted: #6b7280;
  --text-inverse: #0f1117;

  --accent: #4ade80;
  --accent-hover: #22c55e;
  --accent-light: rgba(74, 222, 128, 0.1);
  --accent-glow: rgba(74, 222, 128, 0.25);

  --hero-log-color: rgba(232, 234, 240, 0.09);
  --hero-log-accent: rgba(74, 222, 128, 0.13);
  --hero-log-notice: rgba(161, 161, 170, 0.09);

  --border: #2a2d3e;
  --border-light: #1f2233;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--text-inverse);
  padding: 8px 16px;
  z-index: 100;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 0;
}

/* Common section shell */
.section {
  width: 100%;
  position: relative;
  overflow: hidden;
}

.section__inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  position: relative;
  z-index: 2;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.section-title {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
  transition: color var(--transition);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
  transition: color var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn--primary {
  background: var(--accent);
  color: var(--text-inverse);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--large {
  padding: 16px 32px;
  font-size: 1rem;
}

/* Code block */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: #e5e7eb;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  box-shadow: var(--shadow-lg);
  overflow-x: auto;
  transition: border-color var(--transition);
}

[data-theme="dark"] .code-block {
  border-color: #2f3346;
  box-shadow: 0 0 0 1px rgba(74, 222, 128, 0.06), var(--shadow-lg);
}

.code-block__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-block__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.code-block__dot--red { background: #ef4444; }
.code-block__dot--yellow { background: #f59e0b; }
.code-block__dot--green { background: #10b981; }

.code-block__title {
  margin-left: 8px;
  color: #9ca3af;
  font-size: 0.75rem;
}

.code-block code {
  display: block;
  white-space: pre;
}

.code-block .comment { color: #6b7280; }
.code-block .command { color: #34d399; }
.code-block .prompt { color: #60a5fa; }

/* Dashboard UI mockup */
.dashboard-mockup {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.dashboard-mockup__header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-secondary);
  transition: background-color var(--transition), border-color var(--transition);
}

.dashboard-mockup__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.dashboard-mockup__dot--red { background: #ef4444; }
.dashboard-mockup__dot--yellow { background: #f59e0b; }
.dashboard-mockup__dot--green { background: #10b981; }

.dashboard-mockup__body {
  padding: 20px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.stat-card-mini {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 14px;
  transition: background-color var(--transition);
}

.stat-card-mini__label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.stat-card-mini__value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition);
}

.chart-area {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  height: 140px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 16px 16px 0;
  gap: 8px;
  transition: background-color var(--transition);
}

.chart-bar {
  flex: 1;
  background: linear-gradient(to top, var(--accent), var(--accent-hover));
  border-radius: 4px 4px 0 0;
  opacity: 0.85;
}

/* ============================================================
   Header / Navbar
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  background: rgba(250, 250, 249, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
  background: rgba(15, 17, 23, 0.85);
}

.header--scrolled {
  border-bottom-color: var(--border);
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-size: 1rem;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.header__nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.header__nav-links a:hover {
  color: var(--accent);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__btn {
  padding: 8px 14px;
  font-size: 0.875rem;
  border-radius: 100px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.header__btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.header__mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ============================================================
   Section 1: Hero
   ============================================================ */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  background: var(--bg-primary);
  position: relative;
  transition: background-color var(--transition);
}

.hero__bg-log {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  opacity: 1;
  pointer-events: none;
  transition: opacity var(--transition);
}

.hero__bg-overlay-log {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse at center,
      var(--bg-primary) 0%,
      rgba(250, 250, 249, 0.88) 30%,
      rgba(250, 250, 249, 0.62) 58%,
      rgba(250, 250, 249, 0.85) 100%
    );
  z-index: 1;
  transition: background var(--transition);
}

[data-theme="dark"] .hero__bg-overlay-log {
  background:
    radial-gradient(
      ellipse at center,
      var(--bg-primary) 0%,
      rgba(15, 17, 23, 0.88) 30%,
      rgba(15, 17, 23, 0.58) 58%,
      rgba(15, 17, 23, 0.82) 100%
    );
}

.hero__content {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-light);
  border: 1px solid rgba(22, 101, 52, 0.15);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 28px;
}

[data-theme="dark"] .hero__label {
  border-color: rgba(74, 222, 128, 0.2);
}

.hero__title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.hero__subtitle {
  font-size: 1.35rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 32px;
  line-height: 1.7;
  transition: color var(--transition);
}

.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 32px;
  margin: 0 auto 40px;
  padding: 18px 32px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  border-radius: 100px;
  backdrop-filter: blur(8px);
  transition: background-color var(--transition), border-color var(--transition);
  width: fit-content;
  max-width: 100%;
}

[data-theme="dark"] .hero__stats {
  background: rgba(22, 25, 34, 0.72);
}

.hero__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.hero__stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

.hero__stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.hero__stat-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  transition: background-color var(--transition);
}

/* ============================================================
   Section 2: Highlights
   ============================================================ */
.highlights {
  background: var(--bg-secondary);
  transition: background-color var(--transition);
}

.highlights__header {
  text-align: center;
  margin-bottom: 60px;
}

.highlights__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition);
}

.highlight-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.highlight-card__icon {
  width: 48px;
  height: 48px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.highlight-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.highlight-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: color var(--transition);
}

/* ============================================================
   Section 3: Features
   ============================================================ */
.features {
  background: var(--bg-primary);
  transition: background-color var(--transition);
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
  margin-top: 60px;
}

.features__list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.feature-item {
  display: flex;
  gap: 18px;
}

.feature-item__icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: var(--accent-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.125rem;
}

.feature-item__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.feature-item__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: color var(--transition);
}

.features__visual {
  position: relative;
}

.features__visual .dashboard-mockup {
  transform: rotate(-2deg);
}

.features__visual::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: var(--accent-light);
  border-radius: 28px;
  z-index: -1;
  transform: rotate(2deg);
}

/* ============================================================
   Section 4: How it works
   ============================================================ */
.how-it-works {
  background: var(--bg-secondary);
  transition: background-color var(--transition);
}

.how-it-works__header {
  text-align: center;
  margin-bottom: 70px;
}

.how-it-works__flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.flow-step {
  flex: 1;
  text-align: center;
  position: relative;
}

.flow-step__icon {
  width: 72px;
  height: 72px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto 20px;
  transition: background-color var(--transition), border-color var(--transition);
}

.flow-step__title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  word-break: break-word;
  transition: color var(--transition);
}

.flow-step__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  transition: color var(--transition);
}

.flow-arrow {
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 700;
  opacity: 0.5;
  flex-shrink: 0;
}

/* ============================================================
   Section 5: Quick start
   ============================================================ */
.quick-start {
  background: var(--bg-primary);
  transition: background-color var(--transition);
}

.quick-start__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: center;
  margin-top: 60px;
}

.quick-start__steps {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-top: 32px;
}

.quick-step {
  display: flex;
  gap: 18px;
}

.quick-step__number {
  width: 36px;
  height: 36px;
  min-width: 36px;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

.quick-step__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
  transition: color var(--transition);
}

.quick-step__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

/* ============================================================
   Section 6: Footer
   ============================================================ */
.footer {
  padding: 40px 24px;
  background: var(--bg-dark-accent);
  color: var(--text-inverse);
  transition: background-color var(--transition);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
}

.footer__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer__links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.875rem;
  color: #a1a1aa;
}

.footer__links a:hover {
  color: var(--text-inverse);
}

/* ============================================================
   Utilities
   ============================================================ */
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .section-title {
    font-size: 2.25rem;
  }

  .hero__title {
    font-size: 3rem;
  }

  .hero__subtitle {
    font-size: 1.125rem;
  }

  .highlights__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features__grid,
  .quick-start__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .features__visual {
    order: -1;
  }

  .features__visual .dashboard-mockup {
    transform: rotate(0deg);
  }

  .features__visual::before {
    display: none;
  }
}

@media (max-width: 768px) {
  .section__inner {
    padding: 60px 20px;
  }

  .section-title {
    font-size: 1.875rem;
  }

  .hero {
    min-height: auto;
    padding: 100px 20px 60px;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .hero__stats {
    flex-direction: column;
    gap: 16px;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    width: 100%;
    max-width: 320px;
  }

  .hero__stat-divider {
    width: 40px;
    height: 1px;
  }

  .header__nav-links {
    display: none;
  }

  .header__nav-links--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

  .header__mobile-toggle {
    display: block;
  }

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

  .how-it-works__flow {
    flex-direction: column;
    gap: 32px;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .footer__inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .code-block {
    padding: 20px;
    font-size: 0.75rem;
  }

  .stat-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 1.875rem;
  }

  .hero__subtitle {
    font-size: 0.9375rem;
  }

  .btn--large {
    width: 100%;
  }

  .section-title {
    font-size: 1.625rem;
  }

  .header__actions {
    gap: 8px;
  }

  .header__btn {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }
}