:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #12161f;
  --muted: #5f6778;
  --border: #dde3ee;
  --accent: #2f6cff;
  --success: #118a4f;
  --danger: #c53d3d;
  --warning: #b26a14;
  --shadow: 0 8px 28px rgba(10, 31, 68, 0.08);
}

:root[data-theme='dark'] {
  --bg: #0f1219;
  --surface: #161b25;
  --surface-2: #1c2230;
  --text: #e7ecf7;
  --muted: #a1aabd;
  --border: #2a3346;
  --accent: #6a93ff;
  --success: #45c98f;
  --danger: #ff7f7f;
  --warning: #f0b76b;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
}

body.glass-mode {
  background:
    radial-gradient(1200px 520px at 10% -20%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, color-mix(in srgb, #ffffff 32%, transparent), transparent 62%),
    var(--bg);
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.header-nav label {
  font-size: 0.9rem;
  color: var(--muted);
}

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
}

main {
  padding: 20px;
  max-width: 1240px;
  margin: 0 auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 16px;
  padding: 18px;
}

body.glass-mode .card,
body.glass-mode .topbar,
body.glass-mode .stat-box,
body.glass-mode .list-item,
body.glass-mode .history-list li,
body.glass-mode pre {
  position: relative;
  background: linear-gradient(
    150deg,
    color-mix(in srgb, var(--surface) 60%, transparent),
    color-mix(in srgb, var(--surface-2) 52%, transparent)
  );
  border: 1px solid color-mix(in srgb, #ffffff 34%, var(--border));
  box-shadow:
    0 18px 44px color-mix(in srgb, #000000 14%, transparent),
    inset 0 1px 0 color-mix(in srgb, #ffffff 40%, transparent),
    inset 0 -1px 0 color-mix(in srgb, #000000 12%, transparent);
  backdrop-filter: blur(26px) saturate(1.3);
  -webkit-backdrop-filter: blur(26px) saturate(1.3);
}

body.glass-mode .card::before,
body.glass-mode .topbar::before,
body.glass-mode .stat-box::before,
body.glass-mode .list-item::before {
  content: '';
  position: absolute;
  inset: 1px;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(
    145deg,
    color-mix(in srgb, #ffffff 22%, transparent),
    color-mix(in srgb, #ffffff 6%, transparent) 38%,
    color-mix(in srgb, #000000 9%, transparent)
  );
  opacity: 0.9;
}

body.glass-mode input,
body.glass-mode select,
body.glass-mode .nav-btn {
  background: color-mix(in srgb, var(--surface-2) 56%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 28%, var(--border));
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
}

.auth-card {
  margin: 0;
}

.auth-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: 16px;
  max-width: 980px;
  margin: 30px auto;
}

.header-btn {
  width: auto;
  margin: 0;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
}

.link-btn:hover {
  text-decoration: none;
  border-color: var(--accent);
}

.header-nav select {
  width: auto;
  margin: 0;
  min-width: 106px;
}

.header-checkbox {
  margin-top: 0;
  font-size: 0.9rem;
}

.header-nav a,
.forgot-link a {
  color: var(--accent);
  text-decoration: none;
}

.header-nav a:hover,
.forgot-link a:hover {
  text-decoration: underline;
}

input,
select,
button {
  width: 100%;
  padding: 11px 12px;
  margin: 8px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 15px;
}

button {
  cursor: pointer;
  border: 0;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.warning {
  background: var(--warning);
}

button.success {
  background: var(--success);
}

button.danger {
  background: var(--danger);
}

.landing-hero {
  max-width: 980px;
  margin: 20px auto 16px;
}

.landing-hero h2 {
  margin-bottom: 10px;
}

.landing-cta {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.landing-cta button,
.landing-cta .link-btn {
  width: auto;
  margin: 0;
}

.landing-grid {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(240px, 1fr));
}

.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 16px;
}

.sidebar {
  position: sticky;
  top: 16px;
  height: fit-content;
}

.sidebar-head {
  margin-bottom: 16px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.nav-btn {
  text-align: left;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.nav-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

.sidebar-settings label {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  color: var(--muted);
}

.checkbox-row input {
  width: auto;
  margin: 0;
}

.content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page {
  display: none;
  gap: 12px;
  flex-direction: column;
}

.page.active {
  display: flex;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 12px;
}

.stat-box {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.label {
  color: var(--muted);
  font-size: 0.85rem;
}

.stat-value {
  margin-top: 6px;
  font-size: 1.25rem;
  font-weight: 700;
}

.list {
  display: grid;
  gap: 10px;
}

.list-item {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: var(--surface);
}

.list-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.input-group {
  display: flex;
  gap: 10px;
}

.input-group input,
.input-group button {
  margin: 0;
}

pre {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 12px;
  padding: 12px;
  overflow-x: auto;
  white-space: pre-wrap;
  color: var(--text);
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.history-list li {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: var(--surface);
}

.history-line {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-weight: 600;
  flex-wrap: wrap;
}

.history-meta {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.85rem;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.muted {
  color: var(--muted);
}

.onboarding-list {
  margin: 8px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .auth-split {
    grid-template-columns: 1fr;
  }

  .landing-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .sidebar-nav {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .nav-btn {
    min-width: 130px;
  }
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px;
  }

  .header-nav {
    width: 100%;
  }

  .header-nav .header-btn,
  .header-nav .link-btn,
  .header-nav select {
    width: 100%;
  }

  .header-checkbox {
    width: 100%;
  }

  main {
    padding: 12px;
  }

  .input-group {
    flex-direction: column;
  }
}