/* Premium Rock Solutions Limited — Design System + Global Styles */

:root {
  /* ── Colors (Industrial dark + mining amber) ── */
  --background: 220 24% 7%;
  --foreground: 210 40% 98%;

  --primary: 42 96% 52%;
  --primary-foreground: 222 47% 11%;

  --secondary: 220 18% 12%;
  --secondary-foreground: 210 40% 98%;

  --accent: 28 92% 52%;
  --accent-foreground: 222 47% 11%;

  --muted: 220 16% 16%;
  --muted-foreground: 215 20% 72%;

  --destructive: 0 84% 60%;
  --border: 220 14% 22%;
  --ring: 42 96% 52%;

  --card: 220 18% 10%;
  --card-foreground: 210 40% 98%;

  /* ── Shadows ── */
  --shadow-sm: 0 1px 2px 0 hsl(var(--foreground) / 0.06);
  --shadow-md: 0 10px 18px -12px hsl(var(--foreground) / 0.18), 0 2px 6px -3px hsl(var(--foreground) / 0.08);
  --shadow-lg: 0 18px 30px -18px hsl(var(--foreground) / 0.22), 0 6px 14px -8px hsl(var(--foreground) / 0.10);
  --shadow-elegant: 0 18px 50px -20px hsl(var(--primary) / 0.35);

  /* ── Gradients ── */
  --gradient-primary: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--accent)));
  --gradient-subtle: linear-gradient(135deg, hsl(var(--secondary)), hsl(var(--background)));
  --gradient-hero: radial-gradient(1200px 600px at 20% 10%, hsl(var(--primary) / 0.18), transparent 60%), radial-gradient(900px 500px at 80% 20%, hsl(var(--accent) / 0.14), transparent 55%), linear-gradient(180deg, hsl(var(--background)), hsl(var(--secondary)));

  /* ── Transitions ── */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* ── Border Radius ── */
  --radius-sm: 0.375rem;
  --radius-md: 0.6rem;
  --radius-lg: 0.9rem;
  --radius-xl: 1.2rem;
  --radius-full: 9999px;

  /* ── Typography ── */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --font-display: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;

  /* ── Layout ── */
  --container: 72rem;
}

/* Optional light mode (not default) */
[data-theme="light"] {
  --background: 0 0% 100%;
  --foreground: 222 47% 11%;
  --secondary: 210 40% 96%;
  --secondary-foreground: 222 47% 11%;
  --muted: 210 40% 96%;
  --muted-foreground: 215 16% 47%;
  --border: 214 32% 91%;
  --card: 0 0% 100%;
  --card-foreground: 222 47% 11%;
  --shadow-elegant: 0 18px 50px -20px hsl(var(--primary) / 0.22);
  --gradient-hero: radial-gradient(1200px 600px at 20% 10%, hsl(var(--primary) / 0.14), transparent 60%), radial-gradient(900px 500px at 80% 20%, hsl(var(--accent) / 0.10), transparent 55%), linear-gradient(180deg, hsl(var(--background)), hsl(var(--secondary)));
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  text-rendering: optimizeLegibility;
}

/* Accessible skip link */
.skip-link {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-200%);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast);
  z-index: 50;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid hsl(var(--ring));
  outline-offset: 2px;
}

/* Subtle grid texture */
.bg-grid {
  background-image: linear-gradient(to right, hsl(var(--foreground) / 0.06) 1px, transparent 1px), linear-gradient(to bottom, hsl(var(--foreground) / 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: center;
}

/* Focus ring */
:focus-visible {
  outline: 2px solid hsl(var(--ring));
  outline-offset: 2px;
}

/* Smooth anchor scroll for in-page sections */
html {
  scroll-behavior: smooth;
}

/* Utility: container */
.container-max {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: var(--radius-full);
  padding: 0.75rem 1rem;
  font-weight: 700;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
  user-select: none;
}

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

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--gradient-primary);
  color: hsl(var(--primary-foreground));
  box-shadow: var(--shadow-elegant);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: hsl(var(--secondary));
  color: hsl(var(--secondary-foreground));
  border: 1px solid hsl(var(--border));
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  border-color: hsl(var(--ring));
}

.btn-ghost {
  background: transparent;
  color: hsl(var(--foreground));
  border: 1px solid hsl(var(--border));
}

.btn-ghost:hover {
  background: hsl(var(--muted));
}

/* Cards */
.card {
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid hsl(var(--border));
  background: hsl(var(--muted));
  color: hsl(var(--muted-foreground));
  font-weight: 700;
  font-size: 0.8rem;
}

/* Inputs */
.input {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid hsl(var(--border));
  background: hsl(var(--secondary));
  color: hsl(var(--foreground));
  padding: 0.75rem 0.85rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast);
}

.input::placeholder {
  color: hsl(var(--muted-foreground));
}

.input:focus {
  outline: none;
  border-color: hsl(var(--ring));
  box-shadow: 0 0 0 4px hsl(var(--ring) / 0.18);
}

.input:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Links */
a {
  color: inherit;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition: none !important;
    animation: none !important;
  }
}