:root {
  --bg-color: #f8fafc;
  --header-bg: #0f172a;
  --header-text: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(226, 232, 240, 0.8);
  --text-main: #1e293b;
  --text-muted: #64748b;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --bg-color: #020617;
  --header-bg: #0b1222;
  --header-text: #f8fafc;
  --glass-bg: rgba(30, 41, 59, 0.72);
  --glass-border: rgba(51, 65, 85, 0.6);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --accent-color: #60a5fa;
  --accent-hover: #93c5fd;
  --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.35), 0 10px 10px -6px rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  font-family: Inter, system-ui, -apple-system, sans-serif;
  margin: 0;
  background: var(--bg-color);
  color: var(--text-main);
  background-image:
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.06) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.06) 0px, transparent 50%);
}

header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 40px 20px;
  text-align: center;
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
}

.header-brand {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

.logo-chip {
  width: 52px;
  height: 52px;
  border-radius: 0;
  object-fit: cover;
  display: inline-block;
  background: transparent;
  border: 0;
  box-shadow: none;
}

h1 {
  margin: 0;
  font-size: 2.4rem;
  font-weight: 800;
}

header p {
  margin: 0;
  color: #cbd5e1;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 34px 20px;
}

section {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 28px;
}

section + section {
  margin-top: 18px;
}

h2 {
  margin: 0 0 20px 0;
  font-size: 1.4rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--glass-border);
}

.info-label {
  color: var(--text-muted);
}

.info-value {
  font-weight: 700;
}

.button-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button-group-desktop {
  margin-top: 22px;
}

.button-group-android {
  margin-top: 14px;
}

.button {
  flex: 1;
  min-width: 220px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 8px 14px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
  background: var(--accent-color);
  color: #fff;
}

.button-text-main {
  line-height: 1.1;
}

.button-text-sub {
  margin-top: 3px;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.1;
  opacity: 0.9;
}

.button.secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--glass-border);
}

#android-v8a-link {
  border: 2px solid #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.14);
}

.button.disabled {
  pointer-events: none;
  opacity: 0.55;
}

.hint {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

footer {
  text-align: center;
  padding: 24px 16px 34px;
  color: var(--text-muted);
}

footer a {
  color: inherit;
}

.partner-card {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  text-decoration: none;
  color: var(--text-main);
  background: rgba(37, 99, 235, 0.06);
}

.partner-card:hover {
  border-color: var(--accent-color);
  background: rgba(37, 99, 235, 0.1);
}

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

.partner-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  flex: 0 0 auto;
}

.partner-name {
  font-size: 1.05rem;
  font-weight: 800;
}

.partner-desc {
  color: var(--text-muted);
  font-size: 0.93rem;
}