:root {
  --bg: #0f1220;
  --bg-elevated: #1a1e33;
  --bg-card: #171b30;
  --text: #f1f3fb;
  --text-dim: #9aa1c4;
  --accent: #7c5cff;
  --accent-2: #22d3ee;
  --accent-3: #f472b6;
  --success: #34d399;
  --danger: #f87171;
  --border: #2a2f4d;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at 20% -10%, #23264a 0%, var(--bg) 45%) fixed;
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 18, 32, 0.7);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-size: 1.1rem;
}

nav.site-nav {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

nav.site-nav a {
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-size: 0.92rem;
  color: var(--text-dim);
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

nav.site-nav a:hover {
  color: var(--text);
  border-color: var(--border);
}

nav.site-nav a.active {
  color: var(--text);
  background: var(--bg-elevated);
  border-color: var(--border);
}

main {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

footer.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

.page-title {
  font-size: 2rem;
  margin: 0 0 0.4rem;
}

.page-subtitle {
  color: var(--text-dim);
  margin: 0 0 2rem;
  max-width: 60ch;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.tool-card .icon {
  font-size: 2.2rem;
}

.tool-card h2 {
  margin: 0;
  font-size: 1.25rem;
}

.tool-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.5;
}

.tool-card .go {
  margin-top: auto;
  color: var(--accent-2);
  font-weight: 600;
  font-size: 0.9rem;
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  padding: 0.65rem 1.2rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #0b0d1a;
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-danger {
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.4);
  color: #ffb4b4;
}

.btn-ghost {
  background: transparent;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.fullscreen-controls {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  display: flex;
  gap: 0.5rem;
  z-index: 60;
}

.fullscreen-controls .btn {
  padding: 0.6rem 0.75rem;
  border-radius: 999px;
  font-size: 1rem;
}

textarea, input[type="text"], input[type="number"] {
  font-family: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  font-size: 0.95rem;
}

textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.link-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
  box-shadow: var(--shadow);
}

.link-card .icon {
  font-size: 2.5rem;
}

.link-card h2 {
  margin: 0;
}

.link-card p {
  margin: 0;
  color: var(--text-dim);
}

@media (max-width: 640px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}