/* ============================================
   Snofy Website Stylesheet
   ============================================ */

/* ---------- Variables ---------- */
:root {
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;
  --color-snow: #F0F7FF;
  --color-snow-dark: #DBEAFE;
  --color-accent: #06B6D4;
  --color-text: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-light: #94A3B8;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-border: #E2E8F0;
  --color-success: #10B981;
  --color-danger: #EF4444;

  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-heading: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-card: 0 2px 16px rgba(59,130,246,0.08);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, video { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
p { color: var(--color-text-secondary); line-height: 1.8; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title {
  text-align: center;
  margin-bottom: 56px;
}
.section-title h2 {
  margin-bottom: 16px;
}
.section-title p {
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--color-text);
  text-decoration: none;
}
.logo:hover { color: var(--color-primary); }
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 800;
}
.nav { display: flex; align-items: center; gap: 32px; }
.nav-link {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: var(--transition);
  padding: 4px 0;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: width 0.3s;
}
.nav-link:hover { color: var(--color-primary); }
.nav-link:hover::after { width: 100%; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59,130,246,0.3);
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

/* ---------- Hero ---------- */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--color-snow) 0%, var(--color-bg) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(59,130,246,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--color-snow-dark);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 { margin-bottom: 20px; }
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.hero-stat-label {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59,130,246,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}
.btn-sm { padding: 8px 18px; font-size: 0.9rem; }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }

/* ---------- Feature Cards ---------- */
.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: var(--transition);
}
.feature-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.feature-icon-blue { background: #EFF6FF; color: var(--color-primary); }
.feature-icon-cyan { background: #ECFEFF; color: var(--color-accent); }
.feature-icon-green { background: #ECFDF5; color: var(--color-success); }
.feature-icon-purple { background: #F5F3FF; color: #8B5CF6; }
.feature-icon-orange { background: #FFF7ED; color: #F97316; }
.feature-card h3 { margin-bottom: 12px; }
.feature-card p { font-size: 0.95rem; margin: 0; }

/* ---------- How it works ---------- */
.step-list {
  max-width: 800px;
  margin: 0 auto;
}
.step-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 40px;
  position: relative;
}
.step-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 28px;
  top: 56px;
  bottom: -20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-snow-dark));
}
.step-num {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  position: relative;
  z-index: 1;
}
.step-content h3 { margin-bottom: 8px; }
.step-content p { margin: 0; }

/* ---------- App Preview Mockup ---------- */
.app-preview {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.app-preview::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-snow) 0%, transparent 50%);
  pointer-events: none;
}
.app-screen-placeholder {
  width: 100%;
  max-width: 300px;
  margin: 0 auto 24px;
  aspect-ratio: 9/19;
  background: linear-gradient(135deg, var(--color-snow-dark), #E0F2FE);
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  position: relative;
  overflow: hidden;
}
.app-screen-placeholder::after {
  content: '📱';
  font-size: 3rem;
}
.app-screen-label {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  color: var(--color-text-light);
  white-space: nowrap;
}

/* ---------- Download Section ---------- */
.download-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1D4ED8 100%);
  color: #fff;
  text-align: center;
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}
.download-section::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.download-section h2, .download-section p { color: #fff; }
.download-section p { opacity: 0.85; }
.download-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 40px;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.15);
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-md);
  color: #fff;
  font-weight: 600;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}
.download-btn:hover {
  background: rgba(255,255,255,0.25);
  color: #fff;
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.5);
}
.download-btn-icon { font-size: 1.4rem; }
.download-btn-text { text-align: left; line-height: 1.3; }
.download-btn-text small { font-size: 0.7rem; opacity: 0.8; font-weight: 400; }
.download-btn-text span { font-size: 0.95rem; }

/* ---------- Footer ---------- */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; display: inline-flex; }
.footer-brand p { color: rgba(255,255,255,0.55); font-size: 0.9rem; margin: 0; }
.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
}
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-col ul li a:hover {
  color: #fff;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { color: rgba(255,255,255,0.4); }
.footer-bottom-links a:hover { color: rgba(255,255,255,0.8); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
  cursor: pointer;
}
.faq-item:first-child { padding-top: 0; }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  gap: 16px;
}
.faq-icon {
  min-width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-snow-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: var(--transition);
  color: var(--color-primary);
}
.faq-item.open .faq-icon {
  background: var(--color-primary);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-answer { max-height: 300px; padding-top: 16px; }
.faq-answer p { margin: 0; font-size: 0.95rem; }

/* ---------- Badge / Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}
.tag-blue { background: #EFF6FF; color: var(--color-primary); }
.tag-green { background: #ECFDF5; color: var(--color-success); }
.tag-cyan { background: #ECFEFF; color: var(--color-accent); }

/* ---------- Legal pages ---------- */
.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}
.legal-page header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 2px solid var(--color-border);
}
.legal-page h1 { margin-bottom: 12px; font-size: 2rem; }
.legal-page h2 {
  font-size: 1.3rem;
  margin: 40px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.legal-page p { margin-bottom: 16px; font-size: 0.95rem; }
.legal-page ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}
.legal-page ul li { margin-bottom: 8px; font-size: 0.95rem; color: var(--color-text-secondary); }
.legal-page strong { color: var(--color-text); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: block; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .hero { padding: 120px 0 60px; }
  .hero-stats { gap: 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .download-buttons { flex-direction: column; }
  .step-item:not(:last-child)::after { display: none; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }