/* ============================================
   Mobile LM Server - Landing Page
   Light Theme · Logo-Inspired Purple Palette
   ============================================ */

/* --- CSS Variables (Logo-Inspired Blue Palette) --- */
:root {
  --md-primary: #1565c0;
  --md-on-primary: #ffffff;
  --md-primary-container: #d1e4ff;
  --md-on-primary-container: #001d36;

  --md-secondary: #545f71;
  --md-secondary-container: #d7e3f7;

  --md-surface: #fffbfe;
  --md-surface-dim: #f0f4f9;
  --md-surface-bright: #ffffff;
  --md-on-surface: #1a1c1e;
  --md-on-surface-variant: #44474e;

  --md-outline: #74777f;
  --md-outline-variant: #c4c6d0;

  --md-error: #ba1a1a;
  --md-error-container: #ffdad6;

  --md-surface-container: #f0f4f9;
  --md-surface-container-high: #e7ebf1;

  --gradient-primary: linear-gradient(135deg, #1565c0, #42a5f5, #1565c0);
  --gradient-accent: linear-gradient(135deg, #1565c0, #64b5f6);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--md-surface);
  color: var(--md-on-surface);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 251, 254, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(73, 69, 79, 0.08);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--md-on-surface);
}

.nav-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-logo-text {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--md-on-surface-variant);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-download-btn {
  background: var(--md-primary);
  color: var(--md-on-primary) !important;
  padding: 0.45rem 1.1rem;
  border-radius: 20px;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  transition: opacity 0.2s, transform 0.2s !important;
}

.nav-download-btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  color: var(--md-on-primary) !important;
}

/* --- Section Label & Title --- */
.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--md-primary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--md-on-surface);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--md-on-surface-variant);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding-top: 60px;
  overflow: hidden;
  background: linear-gradient(160deg, #eef4ff 0%, #d1e4ff 40%, #f0f4f9 70%, #fffbfe 100%);
}

.hero-bg-glow {
  position: absolute;
  top: -20%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(21, 101, 192, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 0;
}

.hero-text {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  background: var(--md-primary-container);
  border: 1px solid rgba(21, 101, 192, 0.15);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-on-primary-container);
  margin-bottom: 1.2rem;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1.2rem;
  color: var(--md-on-surface);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--md-on-surface-variant);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 28px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(21, 101, 192, 0.2);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(21, 101, 192, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--md-on-surface);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 28px;
  text-decoration: none;
  border: 1px solid var(--md-outline-variant);
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: var(--md-primary);
  background: rgba(21, 101, 192, 0.04);
}

.hero-stats {
  display: flex;
  gap: 1.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--md-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
}

/* --- Prose Content (文字排版) --- */
.prose-content p {
  font-size: 1rem;
  color: var(--md-on-surface-variant);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.prose-content p strong {
  color: var(--md-on-surface);
  font-weight: 600;
}

.prose-content p em {
  color: var(--md-primary);
  font-style: italic;
}

.prose-content .feature-list {
  margin-bottom: 1.5rem;
}

/* --- Feature List (统一列表样式) --- */
.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  position: relative;
  padding: 0.75rem 1rem 0.75rem 2.2rem;
  margin-bottom: 0.5rem;
  background: var(--md-surface-container);
  border: 1px solid rgba(73, 69, 79, 0.06);
  border-radius: 12px;
  font-size: 0.95rem;
  color: var(--md-on-surface-variant);
  line-height: 1.65;
  transition: background 0.2s, border-color 0.2s;
}

.feature-list li:hover {
  background: var(--md-surface-container-high);
  border-color: rgba(21, 101, 192, 0.12);
}

.feature-list li strong {
  color: var(--md-on-surface);
  font-weight: 600;
}

/* --- Section Alt (alternate background) --- */
.section-alt {
  background: var(--md-surface-container);
  padding: 5rem 0;
}

section:not(.hero):not(.section-alt):not(.gallery-section):not(.download-section) {
  padding: 5rem 0;
}

/* --- Download Section --- */
.download-section {
  padding: 5rem 0;
  background: var(--md-surface-container);
}

.download-card {
  background: linear-gradient(135deg, rgba(21, 101, 192, 0.06), rgba(255, 255, 255, 0.8));
  border: 1px solid rgba(21, 101, 192, 0.12);
  border-radius: 28px;
  padding: 3.5rem;
  text-align: center;
}

.download-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.download-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.btn-download {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

.btn-googleplay {
  display: inline-block;
  transition: transform 0.2s, opacity 0.2s;
}

.btn-googleplay:hover {
  transform: scale(1.03);
  opacity: 0.92;
}

.btn-googleplay img {
  width: 260px;
  height: auto;
}

.download-meta {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--md-on-surface-variant);
}

/* --- Footer --- */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid rgba(73, 69, 79, 0.06);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.footer-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--md-on-surface);
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
  margin-top: 0.25rem;
}

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

.footer-links a {
  text-decoration: none;
  color: var(--md-on-surface-variant);
  font-size: 0.85rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  border-top: 1px solid rgba(73, 69, 79, 0.04);
  padding-top: 1.5rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
}

.footer-tagline {
  margin-top: 0.25rem;
  font-size: 0.75rem !important;
  color: rgba(73, 69, 79, 0.4) !important;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero-title {
    font-size: 2.2rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .download-card {
    padding: 2rem 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-bg-glow {
    width: 300px;
    height: 300px;
  }

  .nav-links a:not(.nav-download-btn) {
    display: none;
  }

  section:not(.hero):not(.section-alt):not(.download-section) {
    padding: 3rem 0;
  }

  .section-alt,
  .download-section {
    padding: 3rem 0;
  }

  .feature-list li {
    font-size: 0.9rem;
    padding: 0.65rem 0.8rem 0.65rem 1.8rem;
  }

  .btn-googleplay img {
    width: 200px;
  }
}