/* ========================================
   DoubleScene — Global Styles
   ======================================== */

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

:root {
  --black: #000;
  --white: #fff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f7;
  --gray-200: #e8e8ed;
  --gray-400: #a1a1a6;
  --gray-500: #86868b;
  --gray-600: #6e6e73;
  --gray-800: #1d1d1f;
  --blue: #007AFF;
  --blue-hover: #0056CC;
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --max-width: 1080px;
  --header-height: 64px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  max-width: 100%;
  display: block;
}

/* ========================================
   Header
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--gray-200);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--black);
}

.logo-img {
  height: 36px;
  width: auto;
  display: inline-block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 14px;
  color: var(--gray-600);
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--black);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--black);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  padding: 32px 24px;
}

.mobile-menu.active {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu a {
  display: block;
  font-size: 28px;
  font-weight: 600;
  color: var(--black);
  padding: 16px 0;
  border-bottom: 1px solid var(--gray-200);
  letter-spacing: -0.02em;
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  .hamburger {
    display: flex;
  }
}

/* ========================================
   Hero
   ======================================== */

.hero {
  padding: 160px 24px 100px;
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--gray-100);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  letter-spacing: 0.02em;
  margin-bottom: 24px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--black);
  margin-bottom: 20px;
}

.hero p {
  font-size: clamp(18px, 2.5vw, 22px);
  color: var(--gray-600);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.5;
}

/* Email Form */
.email-form {
  display: flex;
  gap: 12px;
  max-width: 460px;
  margin: 0 auto;
  justify-content: center;
}

.email-form input[type="email"] {
  flex: 1;
  min-width: 0;
  padding: 14px 20px;
  font-size: 16px;
  font-family: var(--font);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  background: var(--gray-50);
  color: var(--black);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.email-form input[type="email"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}

.email-form input[type="email"]::placeholder {
  color: var(--gray-400);
}

.btn-primary {
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font);
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

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

.btn-primary:active {
  transform: scale(0.98);
}

.form-note {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 12px;
}

@media (max-width: 480px) {
  .email-form {
    flex-direction: column;
  }
  .btn-primary {
    width: 100%;
  }
}

/* ========================================
   Features
   ======================================== */

.features {
  padding: 80px 24px 100px;
  background: var(--gray-50);
}

.features-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.features-header h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--black);
  margin-bottom: 12px;
}

.features-header p {
  font-size: 18px;
  color: var(--gray-600);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border-radius: 20px;
  padding: 40px 32px;
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: var(--gray-100);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--black);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 15px;
  color: var(--gray-600);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
}

/* ========================================
   CTA / Download
   ======================================== */

.cta {
  padding: 100px 24px;
  text-align: center;
}

.cta-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.cta h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--black);
  margin-bottom: 16px;
}

.cta p {
  font-size: 18px;
  color: var(--gray-600);
  margin-bottom: 36px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  background: var(--black);
  color: var(--white);
  border-radius: 14px;
  font-size: 18px;
  font-weight: 600;
  transition: opacity 0.2s, transform 0.1s;
  letter-spacing: -0.01em;
}

.app-store-btn:hover {
  opacity: 0.85;
}

.app-store-btn:active {
  transform: scale(0.98);
}

.app-store-btn svg {
  width: 24px;
  height: 24px;
  fill: var(--white);
}

.app-store-btn .btn-label-small {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.7;
  display: block;
  text-align: left;
  line-height: 1;
  margin-bottom: 2px;
}

.app-store-btn .btn-label-big {
  display: block;
  text-align: left;
  line-height: 1;
  font-size: 18px;
}

/* ========================================
   Footer
   ======================================== */

.footer {
  padding: 48px 24px;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--black);
  letter-spacing: -0.02em;
}

.footer-logo-img {
  height: 28px;
  width: auto;
  display: inline-block;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 13px;
  color: var(--gray-600);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--black);
}

.footer-right {
  font-size: 13px;
  color: var(--gray-500);
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }
  .footer-left {
    flex-direction: column;
    gap: 16px;
  }
}

/* ========================================
   Legal / Info Pages
   ======================================== */

.page-content {
  padding: 120px 24px 80px;
  max-width: 720px;
  margin: 0 auto;
}

.page-content h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--black);
  margin-bottom: 12px;
}

.page-content .page-meta {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 40px;
}

.page-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--black);
  letter-spacing: -0.02em;
  margin-top: 40px;
  margin-bottom: 12px;
}

.page-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--black);
  margin-top: 28px;
  margin-bottom: 8px;
}

.page-content p {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 16px;
}

.page-content ul,
.page-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.page-content li {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 8px;
}

.page-content a {
  color: var(--blue);
  transition: opacity 0.2s;
}

.page-content a:hover {
  opacity: 0.7;
}

/* Contact Page */
.contact-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 40px;
  margin-top: 32px;
}

.contact-card h3 {
  margin-top: 0;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--blue);
  margin-top: 4px;
}

/* ========================================
   Scroll Animations
   ======================================== */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}