:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f9fd;
  --color-text: #1c1c1e;
  --color-text-muted: #5b6470;
  --color-primary: #2f80c9;
  --color-primary-dark: #1f5f9e;
  --color-hero-bg: #d1efFC;
  --color-border: #e4ebf1;
  --color-pro-bg: #12233b;
  --color-pro-text: #f4f9fd;
  --radius: 16px;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

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

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

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

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

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

.btn-small {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.apple-logo {
  font-size: 1.2em;
  line-height: 1;
}

/* Hero */

.hero {
  background: linear-gradient(180deg, var(--color-hero-bg) 0%, var(--color-bg) 100%);
  padding: 72px 0 56px;
}

.hero-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 12px 30px rgba(20, 60, 100, 0.18);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  margin: 0 0 16px;
  max-width: 720px;
}

.hero-sub {
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 0 32px;
  font-size: 1.05rem;
}

.hero-actions {
  margin-bottom: 16px;
}

.hero-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Section titles */

.section-title {
  text-align: center;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  margin-bottom: 40px;
}

/* Features */

.features {
  padding: 72px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.feature-card {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.feature-card h3 {
  margin: 4px 0 10px;
  font-size: 1.1rem;
}

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

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.feature-card-pro {
  border-color: var(--color-primary);
  background: #eaf4fc;
}

.pro-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

/* Pro section */

.pro {
  background: var(--color-pro-bg);
  color: var(--color-pro-text);
  padding: 72px 0;
}

.pro .section-title {
  color: var(--color-pro-text);
}

.pro-inner {
  text-align: center;
  max-width: 560px;
}

.pro-lead {
  color: #b9c6d6;
  margin-bottom: 32px;
}

.pro-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-align: left;
}

.pro-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 1.02rem;
}

.pro-check {
  color: #6cc0ff;
  font-weight: 700;
  flex-shrink: 0;
}

.pro-note {
  color: #8ea1b5;
  font-size: 0.85rem;
}

/* Support */

.support {
  padding: 64px 0;
}

.support-inner {
  text-align: center;
}

.support-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.support-link {
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
}

.support-link:hover {
  border-bottom-color: var(--color-primary);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  .container {
    padding: 0 16px;
  }

  .header-inner .btn-small {
    display: none;
  }

  .brand-name {
    font-size: 0.95rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1216;
    --color-bg-alt: #171b21;
    --color-text: #f2f4f7;
    --color-text-muted: #9aa5b1;
    --color-hero-bg: #16222e;
    --color-border: #262c34;
  }

  .site-header {
    background: rgba(15, 18, 22, 0.85);
  }

  .feature-card-pro {
    background: #16283a;
  }
}