/* ============================================================
   EasyClaw — Static Site Styles
   Sci-fi dark design with cosmic background & glassmorphism.
   ============================================================ */

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

:root {
  /* Palette */
  --color-bg-page: #080a12;
  --color-primary: #6c63ff;
  --color-primary-hover: #7b73ff;
  --color-accent: #00d4ff;

  --color-text: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.4);

  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-strong: rgba(255, 255, 255, 0.18);

  /* Glass */
  --glass-bg: rgba(12, 14, 24, 0.55);
  --glass-bg-hover: rgba(12, 14, 24, 0.65);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(108, 99, 255, 0.4);
  --glass-blur: blur(16px);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.06);

  /* Shadows */
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 40px rgba(108, 99, 255, 0.06);
  --shadow-glow: 0 0 0 1px rgba(108, 99, 255, 0.4), 0 0 24px rgba(108, 99, 255, 0.15);

  /* Typography */
  --font-sans: "Inter", "SF Pro Display", "SF Pro Text", system-ui, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Menlo, monospace;

  /* Dimensions */
  --max-width: 1100px;
  --radius: 10px;
  --radius-lg: 14px;

  /* Motion */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg-page);
  background-image: url("/assets/BACKGROUND.png");
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
  background-repeat: no-repeat;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary-hover);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(108, 99, 255, 0.15);
  color: var(--color-primary-hover);
  padding: 0.15em 0.45em;
  border-radius: 6px;
  border: 1px solid rgba(108, 99, 255, 0.2);
}

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

/* ============================================================
   Header — frosted glass bar
   ============================================================ */
.header {
  background: rgba(8, 10, 18, 0.6);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary-hover);
}

.nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav a:hover {
  color: #ffffff;
  text-decoration: none;
}

.nav-github {
  background: rgba(255, 255, 255, 0.06);
  padding: 6px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.nav-github:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-border-strong);
}

/* ----- Language Switcher ----- */
.lang-switcher {
  position: relative;
  margin-left: 4px;
  border-left: 1px solid var(--color-border-strong);
  padding-left: 16px;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.lang-toggle:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.04);
}

.lang-arrow {
  transition: transform 0.2s;
}

.lang-switcher.open .lang-arrow {
  transform: rotate(180deg);
}

.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  list-style: none;
  background: rgba(14, 16, 28, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 0;
  min-width: 100px;
  max-height: 70vh;
  overflow-y: auto;
  z-index: 200;
  box-shadow: var(--shadow-lg);
}

.lang-switcher.open .lang-menu {
  display: block;
}

.lang-option {
  padding: 7px 14px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-option:hover {
  color: #ffffff;
  background: rgba(108, 99, 255, 0.15);
}

.lang-option.active {
  color: var(--color-primary-hover);
  background: rgba(108, 99, 255, 0.2);
}

/* ============================================================
   Hero — transparent, content floats on cosmic bg
   ============================================================ */
.hero {
  padding: 110px 0 120px;
  text-align: center;
  position: relative;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.15;
  letter-spacing: -0.03em;
  text-shadow: 0 2px 30px rgba(108, 99, 255, 0.2);
}

.hero-subtitle {
  margin-top: 20px;
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-powered {
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.hero-powered a {
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.25);
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
}

.hero-powered a:hover {
  color: #ffffff;
  text-decoration-color: rgba(255, 255, 255, 0.6);
}

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: var(--radius);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-align: center;
  border: none;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #7b73ff 0%, #1adbff 100%);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4), 0 0 40px rgba(108, 99, 255, 0.15);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-download {
  background: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  color: #ffffff;
  width: 100%;
  padding: 16px 24px;
  font-size: 1.05rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}

.btn-download:hover {
  background: linear-gradient(135deg, #7b73ff 0%, #1adbff 100%);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4), 0 0 40px rgba(108, 99, 255, 0.15);
  filter: brightness(1.08);
}

/* ============================================================
   Section Shared Styles
   ============================================================ */
.features h2,
.download h2,
.requirements h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

/* ============================================================
   Features — glass cards
   ============================================================ */
.features {
  padding: 90px 0;
  position: relative;
}

/* subtle horizontal divider */
.features::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
}

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

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.feature-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-3px);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ============================================================
   Download — glass cards
   ============================================================ */
.download {
  padding: 90px 0;
  position: relative;
}

.download::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
}

.download-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-top: -32px;
  margin-bottom: 48px;
  font-size: 1rem;
}

.version {
  font-weight: 600;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1050px;
  margin: 0 auto;
}

.download-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  display: flex;
  flex-direction: column;
}

.download-card:hover {
  background: var(--glass-bg-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.download-os {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-text);
}

.download-meta {
  margin-top: 20px;
}

.download-version {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.download-hash {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  word-break: break-all;
}

.hash-label {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.hash-value {
  font-size: 0.75rem;
}

.download-note {
  text-align: center;
  margin-top: 36px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   Requirements — glass cards
   ============================================================ */
.requirements {
  padding: 90px 0;
  position: relative;
}

.requirements::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1050px;
  margin: 0 auto;
}

.requirements-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  transition: all var(--transition-normal);
}

.requirements-card:hover {
  background: var(--glass-bg-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.requirements-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.requirements-card ul {
  list-style: none;
  padding: 0;
}

.requirements-card li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.requirements-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(108, 99, 255, 0.5);
}

/* ============================================================
   Privacy — glass cards with list items
   ============================================================ */
.privacy {
  padding: 90px 0;
  position: relative;
}

.privacy::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
}

.privacy h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.privacy-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 48px;
  font-size: 1rem;
  line-height: 1.7;
}

.privacy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1050px;
  margin: 0 auto;
}

.privacy-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.privacy-card:hover {
  background: var(--glass-bg-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.privacy-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-text);
}

.privacy-card-note {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.privacy-card ul {
  list-style: none;
  padding: 0;
}

.privacy-card li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.privacy-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(108, 99, 255, 0.5);
}


.privacy-footer-note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   Footer — semi-transparent
   ============================================================ */
.footer {
  background: rgba(8, 10, 18, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 32px 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

.footer a {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: #ffffff;
}

.footer-icp {
  margin-top: 8px;
  font-size: 0.72rem;
  opacity: 0.45;
}

.footer-icp a {
  font-weight: 400;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  body {
    background-attachment: scroll;
  }

  .hero {
    padding: 64px 0 72px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .download-grid,
  .requirements-grid,
  .privacy-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .nav {
    gap: 16px;
  }

  .nav a {
    font-size: 0.82rem;
  }

  .features,
  .download,
  .requirements,
  .privacy {
    padding: 60px 0;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 12px 0;
    gap: 10px;
  }

  .lang-switcher {
    border-left: none;
    padding-left: 0;
  }

  .lang-menu {
    right: auto;
    left: 50%;
    transform: translateX(-50%);
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }
}