/* СвязьОнлайн — Dark/Light theme, mobile-first */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --green-bg: #238636;
  --green-hover: #2ea043;
  --yellow: #d29922;
  --red: #f85149;
  --radius: 12px;
  --radius-sm: 8px;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --border: #d0d7de;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-muted: #8b949e;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --green: #1a7f37;
  --green-bg: #1a7f37;
  --green-hover: #116329;
  --yellow: #9a6700;
  --red: #cf222e;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Header ── */
.header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}
.theme-toggle {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 4px;
  opacity: 0.7;
}
.theme-toggle:hover { opacity: 1; }
.header-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-left: 20px;
}
.header-nav a:hover { color: var(--text-primary); }

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 60px 0 40px;
}
.hero h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}
.hero p {
  color: var(--text-secondary);
  font-size: 18px;
  margin-bottom: 32px;
}
.features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
  text-align: left;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}
.features li {
  list-style: none;
  color: var(--text-secondary);
  font-size: 16px;
  padding-left: 28px;
  position: relative;
}
.features li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background 0.2s, transform 0.1s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--green-bg);
  color: #fff;
}
.btn-primary:hover { background: var(--green-hover); }
.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--accent);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--border); }
.btn-block { display: block; width: 100%; text-align: center; }
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Tariff Cards ── */
.section-title {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  margin: 48px 0 24px;
}
.tariffs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 48px;
}
.tariff-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
  position: relative;
}
.tariff-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.tariff-card.popular {
  border-color: var(--green);
}
.tariff-badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--green-bg);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 12px;
  border-radius: 10px;
  text-transform: uppercase;
}
.tariff-months {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}
.tariff-price {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.tariff-per-month {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.tariff-discount {
  font-size: 13px;
  color: var(--green);
  font-weight: 600;
}

/* ── Steps ── */
.steps {
  counter-reset: step;
  padding: 0;
  list-style: none;
  max-width: 500px;
  margin: 0 auto 48px;
}
.steps li {
  counter-increment: step;
  padding: 12px 0 12px 48px;
  position: relative;
  color: var(--text-secondary);
  font-size: 16px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 10px;
  width: 32px;
  height: 32px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
}

/* ── FAQ Accordion ── */
.faq { margin-bottom: 48px; }
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-q {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  padding: 16px 0;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-q::after {
  content: '+';
  font-size: 20px;
  color: var(--text-secondary);
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after {
  content: '-';
}
.faq-a {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  padding: 0 0 16px;
  display: none;
}
.faq-item.open .faq-a { display: block; }

/* ── Cards (dashboard) ── */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}
.card-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 14px;
}
.card-label { color: var(--text-secondary); }
.card-value { color: var(--text-primary); font-weight: 500; }

.status-active { color: var(--green); }
.status-expired { color: var(--red); }

/* ── Traffic bar ── */
.traffic-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  margin: 8px 0;
  overflow: hidden;
}
.traffic-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s;
}

/* ── Form ── */
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}
.form-input:focus { border-color: var(--accent); }
.form-input::placeholder { color: var(--text-muted); }
.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}
.form-checkbox input[type="checkbox"] {
  margin-top: 2px;
  accent-color: var(--accent);
  min-width: 16px;
}
.form-checkbox a { color: var(--accent); }

/* ── Platform tabs ── */
.platform-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.platform-tab {
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}
.platform-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.platform-content { display: none; }
.platform-content.active { display: block; }

/* ── Copy field ── */
.copy-field {
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin: 8px 0;
  gap: 8px;
}
.copy-field input {
  flex: 1;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 13px;
  outline: none;
  font-family: monospace;
}
.copy-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
}
.copy-btn:hover { color: var(--text-primary); }
.copy-btn.copied { color: var(--green); }

/* ── Footer ── */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}
.footer a { color: var(--text-secondary); text-decoration: none; }
.footer a:hover { color: var(--text-primary); }

/* ── Alerts ── */
.alert {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 14px;
}
.alert-success { background: #0d2818; border: 1px solid #238636; color: var(--green); }
.alert-warning { background: #2d1b00; border: 1px solid #9e6a03; color: var(--yellow); }
.alert-error { background: #2d0000; border: 1px solid #f85149; color: var(--red); }

/* ── Loading spinner ── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero h1 { font-size: 24px; }
  .hero p { font-size: 16px; }
  .tariffs { grid-template-columns: repeat(2, 1fr); }
  .tariff-price { font-size: 22px; }
  .container { padding: 0 16px; }
}