/* NexusCore Cloud - Professional Design System */

/* ========================================================================
   1. Design Tokens & Reset
   ======================================================================== */

:root {
  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;

  /* Border Radii - Sharp, Professional */
  --radius-0: 0px;
  --radius-1: 3px;   /* default small radius */
  --radius-2: 6px;   /* max for large images/cards */

  /* Flat Professional Palette */
  --bg: #0b0d10;          /* page background */
  --surface: #121518;     /* cards, panels */
  --elev: #171b20;        /* hover/raised */
  --border: #242b33;      /* subtle borders */
  --text: #e9edf3;        /* primary text */
  --muted: #95a2b3;       /* secondary text */
  --accent: #3b82f6;      /* single brand accent */
  --accent-hover: #2563eb;
  --accent-ink: #0b224d;  /* pressed */
  --good: #22c55e;
  --warn: #f59e0b;
  --bad:  #ef4444;

  /* Focus States */
  --focus: 2px solid rgba(59,130,246,.7);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
}

/* Global Reset */
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
  border-radius: 0; /* flatten everything by default */
}

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

a:hover {
  text-decoration: underline;
}

:focus {
  outline: var(--focus);
  outline-offset: 2px;
}

/* ========================================================================
   2. Buttons
   ======================================================================== */

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: var(--radius-1);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.02s ease;
  text-decoration: none;
}

.button:hover {
  background: var(--elev);
  text-decoration: none;
}

.button--primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.button--primary:hover {
  background: var(--accent-hover);
  filter: brightness(1.05);
}

.button:active {
  transform: translateY(1px);
}

.button:focus-visible {
  outline: var(--focus);
}

.button--lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.05rem;
}

.button--sm {
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
}

/* ========================================================================
   3. Cards & Sections
   ======================================================================== */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-1);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.04);
  transition: background 0.15s ease;
}

.card:hover {
  background: var(--elev);
}

.section {
  padding-block: 3.5rem;
  border-top: 1px solid var(--border);
}

.section:first-of-type {
  border-top: 0;
}

.h1 {
  font-size: clamp(1.8rem, 2.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0;
}

.h2 {
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 700;
  line-height: 1.3;
  margin: 0;
}

.h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
}

.lead {
  color: var(--muted);
  max-width: 65ch;
  font-size: 1rem;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ========================================================================
   4. Utility Classes
   ======================================================================== */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.flex {
  display: flex;
  gap: var(--space-3);
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }

.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--muted); }
.text-center { text-align: center; }

/* ========================================================================
   5. Accessibility & Motion
   ======================================================================== */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================================================
   6. Responsive
   ======================================================================== */

@media (max-width: 768px) {
  .h1 {
    font-size: 1.5rem;
  }

  .h2 {
    font-size: 1.25rem;
  }

  .section {
    padding-block: 2rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}