/* =========================================================
   TinyTools Demo Hub – Global Stylesheet
   ========================================================= */

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

:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-hover: #273449;
  --color-border: #334155;
  --color-accent: #38bdf8;
  --color-accent-dark: #0ea5e9;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --radius: 0.75rem;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-dark);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header ---------- */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-header .logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.site-header .logo span {
  color: var(--color-accent);
}

/* ---------- Hero ---------- */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  margin-bottom: 1rem;
}

.hero h1 span {
  color: var(--color-accent);
}

.hero p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Demo Grid ---------- */
.demo-section {
  padding: 2rem 0 5rem;
}

.demo-section h2 {
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* ---------- Demo Card ---------- */
.demo-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow);
  transition: border-color var(--transition), transform var(--transition);
}

.demo-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.demo-card .card-icon {
  font-size: 2rem;
  line-height: 1;
}

.demo-card .card-title {
  font-size: 1.125rem;
  font-weight: 700;
}

.demo-card .card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  flex: 1;
}

.demo-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-accent);
}

.demo-card .card-link::after {
  content: "→";
  transition: transform var(--transition);
}

.demo-card:hover .card-link::after {
  transform: translateX(4px);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ---------- Back Link (used in demo pages) ---------- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.back-link::before {
  content: "←";
}

.back-link:hover {
  color: var(--color-accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .hero {
    padding: 3rem 0 2rem;
  }

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