/* style.css — Mobitub site */

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-8));
}

.container-narrow {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-8));
}

section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
  position: relative;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
}

.eyebrow.alt {
  color: var(--color-secondary);
  background: var(--color-secondary-soft);
}

.section-title {
  font-size: var(--text-2xl);
  margin-top: var(--space-4);
  max-width: 22ch;
}

.section-lede {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 56ch;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-sm);
  border: 1.5px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow-lime);
}
[data-theme='dark'] .btn-primary {
  color: #0e1208;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 16px 50px rgba(135, 182, 46, 0.4);
}

.btn-secondary {
  background: var(--color-secondary);
  color: #fff;
  box-shadow: var(--shadow-glow-sky);
}
.btn-secondary:hover {
  background: var(--color-secondary-hover);
  transform: translateY(-2px);
}

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

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background 200ms ease;
}
.site-header.scrolled {
  border-bottom-color: var(--color-divider);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}

.nav-brand .brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}
@media (min-width: 880px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
}
.nav-links a:hover {
  color: var(--color-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(var(--space-12), 8vw, var(--space-24));
  padding-bottom: clamp(var(--space-16), 10vw, var(--space-32));
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
}
@media (min-width: 980px) {
  .hero-grid {
    grid-template-columns: 1.05fr 1fr;
  }
}

.hero h1 {
  font-size: var(--text-hero);
  letter-spacing: -0.035em;
  line-height: 0.98;
  margin-top: var(--space-6);
}

.hero h1 .accent-lime {
  color: var(--color-primary);
}
.hero h1 .accent-sky {
  color: var(--color-secondary);
}

.hero-lede {
  margin-top: var(--space-6);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.hero-meta strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Hero illustration */
.hero-art {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 560px;
  width: 100%;
  margin-inline: auto;
}

.hero-art svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(var(--shadow-lg));
}

.hero-glow {
  position: absolute;
  inset: -10% -10% 0 -10%;
  background:
    radial-gradient(circle at 30% 30%, var(--color-primary-glow), transparent 55%),
    radial-gradient(circle at 70% 70%, var(--color-secondary-glow), transparent 55%);
  filter: blur(40px);
  opacity: 0.7;
  z-index: -1;
}

/* Background pattern */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, var(--color-divider) 1px, transparent 0);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at 50% 30%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, black 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.6;
}

/* ---------- Trusted strip ---------- */
.trusted {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}
.trusted-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.trusted-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.trusted-icons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  align-items: center;
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: var(--text-sm);
}
.trusted-icons span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-12);
}
@media (min-width: 760px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.step-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.step-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
}
.step:nth-child(2) .step-icon {
  background: var(--color-secondary-soft);
  color: var(--color-secondary);
}

.step h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-3);
}

.step p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
}

/* ---------- Features ---------- */
.features-section {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.features-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: end;
  margin-bottom: var(--space-12);
}
@media (min-width: 880px) {
  .features-head {
    grid-template-columns: 1.2fr 1fr;
  }
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1000px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.feature:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.feature--sky .feature-icon {
  background: var(--color-secondary-soft);
  color: var(--color-secondary);
}

.feature h3 {
  font-size: var(--text-lg);
}
.feature p {
  color: var(--color-text-muted);
}

.feature-tag {
  align-self: flex-start;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

/* ---------- Showcase / split ---------- */
.showcase {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
  margin-top: var(--space-12);
}
@media (min-width: 980px) {
  .showcase {
    grid-template-columns: 1fr 1fr;
  }
  .showcase.reverse > :first-child {
    order: 2;
  }
}

.showcase-art {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  box-shadow: var(--shadow-md);
}

.showcase h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-5);
}
.showcase p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.showcase ul {
  list-style: none;
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-3);
}
.showcase li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: var(--text-base);
  color: var(--color-text);
}
.showcase li::before {
  content: '';
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 4px;
  border-radius: var(--radius-full);
  background: var(--color-primary-soft) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2387b62e' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>") center/14px no-repeat;
}

/* ---------- Use cases ---------- */
.use-cases {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-top: var(--space-12);
}
@media (min-width: 640px) {
  .use-cases {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1000px) {
  .use-cases {
    grid-template-columns: repeat(3, 1fr);
  }
}

.use-case {
  position: relative;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  background: linear-gradient(160deg, var(--color-surface) 0%, var(--color-surface-2) 100%);
  border: 1px solid var(--color-divider);
  overflow: hidden;
  transition: transform var(--transition-interactive), border-color var(--transition-interactive);
}
.use-case::after {
  content: '';
  position: absolute;
  inset: auto -30% -50% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-interactive);
}
.use-case:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
}
.use-case:hover::after {
  opacity: 1;
}

.use-case-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.use-case-emoji {
  font-size: 1.6rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.use-case h3 {
  font-size: var(--text-lg);
}
.use-case p {
  color: var(--color-text-muted);
  position: relative;
  z-index: 1;
}

/* ---------- Stats ---------- */
.stats-section {
  background: linear-gradient(135deg, var(--brand-lime) 0%, #d4ec85 50%, var(--brand-sky) 100%);
  color: #0e1208;
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1.2px 1.2px, rgba(0, 0, 0, 0.08) 1.2px, transparent 0);
  background-size: 24px 24px;
  opacity: 0.5;
}

.stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  position: relative;
}
@media (min-width: 700px) {
  .stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-label {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  opacity: 0.85;
  max-width: 22ch;
}

/* ---------- FAQ ---------- */
.faq {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-10);
  max-width: 820px;
  margin-inline: auto;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-interactive);
}
.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: var(--space-5) var(--space-6);
  font-weight: 600;
  font-size: var(--text-base);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-interactive);
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item p {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-text-muted);
}

/* ---------- CTA banner ---------- */
.cta-banner {
  position: relative;
  border-radius: var(--radius-2xl);
  padding: clamp(var(--space-10), 6vw, var(--space-20));
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2f1a 100%);
  color: #fff;
  overflow: hidden;
  text-align: center;
}
.cta-banner::before,
.cta-banner::after {
  content: '';
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
  pointer-events: none;
}
.cta-banner::before {
  background: var(--brand-lime);
  top: -120px;
  left: -120px;
}
.cta-banner::after {
  background: var(--brand-sky);
  bottom: -120px;
  right: -120px;
}

.cta-banner > * {
  position: relative;
  z-index: 1;
}
.cta-banner h2 {
  font-size: var(--text-2xl);
  max-width: 18ch;
  margin-inline: auto;
}
.cta-banner p {
  margin: var(--space-5) auto 0;
  color: rgba(255, 255, 255, 0.78);
  max-width: 50ch;
}
.cta-banner .hero-cta {
  justify-content: center;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-16) var(--space-10);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}
@media (min-width: 760px) {
  .footer-grid {
    grid-template-columns: 1.4fr repeat(3, 1fr);
  }
}

.footer-brand p {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  max-width: 36ch;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-col ul {
  display: grid;
  gap: var(--space-3);
  list-style: none;
}

.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text);
}
.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.social {
  display: flex;
  gap: var(--space-2);
}
.social a {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.social a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ---------- Reveal on scroll (progressive enhancement) ---------- */
/* Only hide when JS has marked the page as ready. */
html.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 700ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}
html.js .reveal.in {
  opacity: 1;
  transform: none;
}

/* Float animation for hero art */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero-art svg { animation: float 6s ease-in-out infinite; }

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