:root {
  --color-bg: #0f1419;
  --color-surface: #1a2332;
  --color-surface-alt: #243044;
  --color-text: #e8edf4;
  --color-text-muted: #9aa8bc;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-accent: #22d3ee;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

main {
  flex: 1;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: #67e8f9;
  text-decoration: underline;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .navbar {
  padding: 0.75rem 0;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text) !important;
  text-decoration: none !important;
}

.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 8px;
}

.brand-name {
  line-height: 1.2;
}

.navbar-brand:hover .brand-logo {
  opacity: 0.92;
}

.site-header .nav-link {
  color: var(--color-text-muted) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  border-radius: 8px;
}

.site-header .nav-link:hover {
  color: var(--color-text) !important;
  background: var(--color-surface);
}

.navbar-toggler {
  border-color: var(--color-border);
}

.navbar-toggler-icon {
  filter: invert(1);
}

/* Eski mockup öğeleri (önbellekten kalırsa gizle) */
.hero-visual,
.device-stack,
.watch-mockup,
.phone-mockup {
  display: none !important;
}

/* Hero */
.hero {
  padding: 4rem 0 5rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(59, 130, 246, 0.25), transparent),
    var(--color-bg);
}

.hero-content {
  text-align: left;
  max-width: 40rem;
}

.hero-logo {
  width: 88px;
  height: 88px;
  object-fit: contain;
  margin-bottom: 1.25rem;
  display: block;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(34, 211, 238, 0.12);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.85rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 32rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-primary {
  background: var(--color-primary);
  border: none;
  font-weight: 600;
  padding: 0.65rem 1.5rem;
  border-radius: 10px;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-outline-light {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-weight: 600;
  border-radius: 10px;
}

.btn-outline-light:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn-disabled {
  opacity: 0.85;
  cursor: default;
  pointer-events: none;
}

/* How it works */
.section-how {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--color-border);
}

.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  height: 100%;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.step-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-card p {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.95rem;
}

/* Sync banner */
.section-sync {
  padding: 3rem 0;
}

.sync-banner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

@media (min-width: 768px) {
  .sync-banner {
    grid-template-columns: 1.4fr 1fr;
    align-items: center;
  }
}

.sync-text h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.sync-text p {
  color: var(--color-text-muted);
  margin: 0;
}

.sync-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sync-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.65rem;
  color: var(--color-text);
  font-weight: 500;
}

.sync-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* Features */
.section-features {
  padding: 3rem 0 4rem;
}

.section-title {
  text-align: center;
  font-weight: 700;
  margin-bottom: 2.5rem;
  font-size: 1.75rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  height: 100%;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0.75rem 0 0.5rem;
}

.feature-card p {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.95rem;
}

.feature-icon {
  font-size: 1.75rem;
}

/* CTA */
.section-cta {
  padding: 4rem 0 5rem;
  border-top: 1px solid var(--color-border);
  background: radial-gradient(ellipse 60% 40% at 50% 100%, rgba(59, 130, 246, 0.12), transparent);
}

.section-cta h2 {
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-cta .text-muted {
  color: var(--color-text-muted) !important;
}

.cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn-outline-primary {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 10px;
  font-weight: 500;
}

.btn-outline-primary:hover {
  background: rgba(59, 130, 246, 0.15);
  color: #93c5fd;
}

/* Legal & contact pages */
.legal-page,
.contact-page {
  padding: 3rem 1rem 5rem;
  max-width: 800px;
}

.legal-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.legal-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.legal-meta {
  color: var(--color-text-muted);
  margin: 0;
}

.legal-lang {
  font-size: 0.9rem;
  margin: 0 0 1rem;
  color: var(--color-text-muted);
}

.legal-lang strong {
  color: var(--color-text);
}

.legal-page section {
  margin-bottom: 2rem;
}

.legal-page h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--color-text);
}

.legal-page h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1rem 0 0.5rem;
  color: var(--color-text-muted);
}

.legal-page p,
.legal-page li {
  color: var(--color-text-muted);
}

.legal-page ul {
  padding-left: 1.25rem;
}

.legal-page li {
  margin-bottom: 0.35rem;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  height: 100%;
}

.contact-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.contact-email a {
  font-size: 1.25rem;
  font-weight: 600;
}

.contact-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-links li {
  margin-bottom: 0.5rem;
}

code {
  font-size: 0.85em;
  background: var(--color-surface-alt);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--color-accent);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  margin-top: auto;
  background: var(--color-surface);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-tagline {
  color: var(--color-text-muted);
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--color-text-muted);
}

.footer-copy {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin: 0;
  opacity: 0.8;
}