/* =========================================
   Pacific Star — Design System Tokens
   =========================================
   Industrial / maritime / northern visual language.
   Complements --color-* base tokens in style.css.
   ========================================= */

/* --- Design System Variables --- */
:root {
  /* ── Extended palette ── */
  --color-graphite:      #3a4555;  /* dark mid-tone for secondary text   */
  --color-steel:         #64748b;  /* steel grey for meta / captions      */
  --color-surface:       #f8fafc;  /* cold light background               */
  --color-surface-alt:   #f1f5f9;  /* alternate section background        */
  --color-ink:           #1e293b;  /* near-black for body text            */

  /* ── Semantic colours ── */
  --color-success:       #16734a;
  --color-success-bg:    #e6f9ee;
  --color-warning:       #92400e;
  --color-warning-bg:    #fff7e0;
  --color-error:         #b91c1c;
  --color-error-bg:      #fee2e2;
  --color-info:          #1e40af;
  --color-info-bg:       #e8f2ff;

  /* ── Spacing scale (4px base) ── */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-7:  32px;
  --space-8:  40px;
  --space-9:  48px;
  --space-10: 56px;
  --space-11: 64px;
  --space-12: 80px;

  /* ── Typography ── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Type scale */
  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-md:   1.05rem;   /* ~17px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.25rem;   /* 20px */
  --text-2xl:  1.5rem;    /* 24px */
  --text-3xl:  1.875rem;  /* 30px */
  --text-4xl:  2.25rem;   /* 36px */

  /* Font weights */
  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;
  --weight-black:    800;

  /* Line-height */
  --leading-tight:   1.25;
  --leading-snug:    1.35;
  --leading-normal:  1.6;
  --leading-relaxed: 1.75;

  /* Letter-spacing */
  --tracking-tight:  -0.01em;
  --tracking-normal: 0;
  --tracking-wide:   0.04em;

  /* ── Focus ring ── */
  --focus-ring: 0 0 0 3px rgba(26, 77, 160, 0.35);

  /* ── Elevation ── */
  --shadow-xs:  0 1px 3px rgba(13, 43, 94, 0.06);
  --shadow-sm:  0 2px 8px rgba(13, 43, 94, 0.08);
  --shadow-md:  0 4px 16px rgba(13, 43, 94, 0.10);
  --shadow-lg:  0 8px 32px rgba(13, 43, 94, 0.13);
  --shadow-xl:  0 12px 48px rgba(13, 43, 94, 0.16);

  /* ── Transition tokens ── */
  --ease-out:  cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in:   cubic-bezier(0.4, 0, 1, 1);
  --duration-fast: 0.15s;
  --duration-base: 0.25s;
  --duration-slow: 0.4s;
}

/* --- Card surface (solid, no blur/transparency) --- */
.premium-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}

.premium-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-secondary);
}

/* --- Scroll animation base state --- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s var(--ease-out);
  will-change: opacity, transform;
}

/* Visible state added by JS IntersectionObserver */
.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay helpers */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

/* --- Heading refinement --- */
.section-title {
  font-family: var(--font-sans);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
}

/* Subtle accent line under section headings */
.section-title::after {
  content: '';
  display: block;
  width: var(--space-10);
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-3) auto 0;
  border-radius: 2px;
}

/* Left-aligned variant */
.section-title--left::after {
  margin-left: 0;
  margin-right: auto;
}

/* --- Button size variants --- */
.btn-sm {
  padding: 8px 20px;
  font-size: var(--text-sm);
}

.btn-lg {
  padding: 16px 40px;
  font-size: var(--text-lg);
}

/* Disabled state for buttons */
.btn[disabled],
.btn.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* --- Focus-visible for interactive elements --- */
a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Buttons keep their border-radius when focused */
.btn:focus-visible {
  box-shadow: var(--focus-ring);
}

/* --- Form field disabled state --- */
.form-control[disabled],
.form-control[readonly] {
  background: var(--color-surface-alt);
  color: var(--color-steel);
  cursor: not-allowed;
  opacity: 0.7;
}

/* --- Reduced-motion safety net --- */
@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll,
  .animate-on-scroll.is-visible,
  .premium-card,
  .premium-card:hover {
    transition: none !important;
    transform: none !important;
    animation: none !important;
  }

  .animate-on-scroll {
    opacity: 1 !important;
  }
}