/* ===== Reset & Variables ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --text: #1E293B;
  --text-secondary: #64748B;
  --bg: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.1);
  --max-width: 1100px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), #7C3AED);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  -webkit-text-fill-color: initial;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color .2s;
}

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

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
  overflow: hidden;
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -.02em;
}

.highlight {
  background: linear-gradient(135deg, var(--primary), #7C3AED);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  transition: all .25s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79,70,229,.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,70,229,.45);
}

.btn-outline {
  background: var(--bg);
  color: var(--primary);
  border: 2px solid var(--border);
}

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

/* ===== Hero Mockup ===== */
.hero-mockup {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-top: 60px;
  perspective: 800px;
}

.mockup-card {
  width: 180px;
  height: 260px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transform: rotateY(-8deg) rotateX(4deg);
  border: 1px solid var(--border);
}

.mockup-card:nth-child(2) {
  transform: rotateY(0) translateY(-12px);
}

.mockup-card:nth-child(3) {
  transform: rotateY(8deg) rotateX(4deg);
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  opacity: .3;
}

.mockup-line {
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  width: 100%;
}

.mockup-line--medium { width: 70%; }
.mockup-line--short { width: 45%; }

/* ===== Sections ===== */
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  text-align: center;
  letter-spacing: -.02em;
}

.section-sub {
  color: var(--text-secondary);
  text-align: center;
  margin-top: 12px;
  font-size: 17px;
}

/* ===== Features ===== */
.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all .3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--primary);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ===== About ===== */
.about {
  padding: 100px 0;
}

.about-text {
  max-width: 680px;
  margin: 40px auto 0;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 16px;
  text-align: center;
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer-brand strong {
  display: block;
  font-size: 20px;
  margin-bottom: 4px;
}

.footer-brand span {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color .2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  color: var(--text-secondary);
  font-size: 13px;
}

.footer-bottom .icp {
  margin-top: 6px;
}

.footer-bottom .icp a {
  color: var(--text-secondary);
  font-size: 12px;
  transition: color .2s;
}

.footer-bottom .icp a:hover {
  color: var(--primary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero {
    padding: 60px 0 40px;
  }

  .hero-mockup {
    flex-direction: column;
    align-items: center;
    margin-top: 40px;
  }

  .mockup-card {
    width: 200px;
    height: 100px;
    transform: none !important;
  }

  .mockup-card:nth-child(3) {
    display: none;
  }

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

  .footer-top {
    flex-direction: column;
    text-align: center;
  }

  .features,
  .about {
    padding: 60px 0;
  }
}