/* ============================================================
   WHITE TAB PARTNERS LLP -- Design System v3
   Editorial Luxury · Light Theme
   ============================================================ */

/* --- Custom Properties --- */
:root {
  /* Core Palette -- Warm Light */
  --ivory-50: #FDFCFA;
  --ivory-100: #FAFAF7;
  --ivory-200: #F3F1EC;
  --ivory-300: #EAE7E0;
  --ivory-400: #DDD9CF;
  --parchment: #F3F1EC;

  /* Charcoal / Navy -- for text & dark sections */
  --charcoal-950: #111318;
  --charcoal-900: #1A1D23;
  --charcoal-800: #252830;
  --charcoal-700: #33373F;
  --charcoal-600: #464B55;
  --charcoal-500: #5A5F6A;
  --charcoal-400: #64686E;
  --charcoal-300: #9B9FA6;
  --charcoal-200: #B8BBC2;
  --charcoal-100: #D4D6DA;

  /* Golds -- deeper, warmer for light backgrounds */
  --gold-700: #7A5E1F;
  --gold-600: #8B6B22;
  --gold-500: #9E7B34;
  --gold-400: #B8923E;
  --gold-300: #C9A656;
  --gold-200: #D9BE7A;
  --gold-100: #EAD8A6;
  --gold-50: #F5EDD0;

  /* Accent Tints */
  --tint-gold: rgba(158, 123, 52, 0.08);
  --tint-gold-strong: rgba(158, 123, 52, 0.14);
  --tint-charcoal: rgba(26, 29, 35, 0.04);

  /* Neutrals */
  --white: #FFFFFF;
  --black: #000000;

  /* Functional Tokens */
  --bg-primary: var(--ivory-100);
  --bg-card: var(--white);
  --bg-card-hover: var(--ivory-50);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-section-alt: var(--parchment);
  --bg-dark: var(--charcoal-900);
  --bg-dark-card: rgba(255, 255, 255, 0.06);

  --accent: var(--gold-500);
  --accent-hover: var(--gold-400);
  --accent-dark: var(--gold-700);

  --text-primary: var(--charcoal-900);
  --text-secondary: var(--charcoal-400);
  --text-muted: var(--charcoal-300);
  --text-on-dark: var(--ivory-100);
  --text-on-dark-secondary: var(--charcoal-200);

  --border-subtle: rgba(30, 35, 45, 0.06);
  --border-default: rgba(30, 35, 45, 0.10);
  --border-strong: rgba(158, 123, 52, 0.25);
  --border-glow: rgba(158, 123, 52, 0.45);

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.75rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;

  /* Spacing (High-end spacing reduced for a tighter, refined layout) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 3.5rem;
  --space-20: 4.5rem;
  --space-24: 5.5rem;
  --space-32: 7rem;
  --space-40: 8.5rem;

  /* Layout */
  --max-width: 1340px;
  --max-width-narrow: 860px;
  --max-width-wide: 1600px;
  --nav-height: 80px;
  --topbar-height: 40px;

  /* Effects */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.10);
  --shadow-warm: 0 4px 24px rgba(158, 123, 52, 0.10);
  --shadow-warm-strong: 0 8px 40px rgba(158, 123, 52, 0.16);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.08), 0 2px 8px rgba(158,123,52,0.08);

  --transition-fast: 0.15s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--topbar-height) + 24px);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
  position: relative;
}

main {
  display: block;
}

main:focus {
  outline: none;
}

.skip-link {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 2000;
  padding: 12px 18px;
  border-radius: var(--radius-full);
  background: var(--charcoal-900);
  color: var(--white);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transform: translateY(-160%);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  box-shadow: var(--shadow-md);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* Subtle warm grain texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.018;
  z-index: 1100;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px 128px;
  mix-blend-mode: multiply;
  transform: translateZ(0);
}

::selection {
  background: var(--gold-200);
  color: var(--charcoal-900);
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
button { font-family: var(--font-body); cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-6xl); font-weight: 500; }
h2 { font-size: var(--text-4xl); font-weight: 500; }
h3 { font-size: var(--text-2xl); font-weight: 500; }
h4 { font-size: var(--text-xl);  font-weight: 600; }

h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
}

p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: var(--text-base);
  text-wrap: pretty;
}

.text-gold { color: var(--accent); }
.text-white { color: var(--white); }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-center { text-align: center; }

/* Label / Eyebrow */
.label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.section-label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--accent);
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 40px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent));
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
  min-width: 0;
}

.container--narrow { max-width: var(--max-width-narrow); }
.container--wide { max-width: var(--max-width-wide); }

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section--lg {
  padding: var(--space-32) 0;
}

.section--dark {
  background: var(--bg-section-alt);
}

.section--accent {
  background: var(--white);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              background-color var(--transition-base),
              border-color var(--transition-base),
              color var(--transition-base);
}

/* Accessibility Focus Ring */
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.btn--gold {
  background: linear-gradient(135deg, var(--gold-500), var(--gold-700));
  color: var(--white);
  box-shadow: 0 4px 20px rgba(158, 123, 52, 0.25);
}

/* Button shine */
.btn--gold::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn--gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(158, 123, 52, 0.35);
}

.btn--gold:hover::before {
  transform: translateX(100%);
}

.btn--outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border-strong);
}

.btn--outline:hover {
  background: var(--tint-gold);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-warm);
}

.btn--white {
  background: var(--white);
  color: var(--charcoal-900);
  font-weight: 700;
}

.btn--white:hover {
  background: var(--ivory-100);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--dark {
  background: var(--charcoal-900);
  color: var(--white);
  font-weight: 600;
}

.btn--dark:hover {
  background: var(--charcoal-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--lg {
  padding: 18px 40px;
  font-size: var(--text-base);
}

.btn--sm {
  padding: 8px 20px;
  font-size: var(--text-xs);
}

.btn--icon-arrow::after {
  content: '\2192';
  transition: transform var(--transition-base);
}

.btn--icon-arrow:hover::after {
  transform: translateX(4px);
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  will-change: transform;
  transition: transform var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.card:hover::before {
  opacity: 1;
}

/* --- Dividers --- */
.divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  margin: var(--space-6) 0;
}

.divider--center { margin-left: auto; margin-right: auto; }

/* --- Grids --- */
.grid {
  display: grid;
  gap: var(--space-8);
  min-width: 0;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* --- Page Header --- */
.page-header {
  padding: calc(var(--nav-height) + var(--topbar-height) + var(--space-24)) 0 var(--space-20);
  background:
    radial-gradient(circle at top center, rgba(158, 123, 52, 0.14), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(250, 250, 247, 1));
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, var(--tint-gold-strong) 0%, transparent 70%);
  pointer-events: none;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

.page-header h1 { margin-bottom: var(--space-4); }

.page-header p {
  max-width: 640px;
  margin: 0 auto;
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* --- Forms --- */
.form-group { margin-bottom: var(--space-5); }

.form-label {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-control {
  width: 100%;
  background: var(--ivory-100);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              background-color var(--transition-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--tint-gold);
  background: var(--white);
}

.form-control::placeholder {
  color: var(--text-muted);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239E7B34' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

/* --- Dark Section Overrides --- */
.section--charcoal {
  background: var(--charcoal-900);
  color: var(--text-on-dark);
}

.section--charcoal h1,
.section--charcoal h2,
.section--charcoal h3,
.section--charcoal h4 {
  color: var(--text-on-dark);
}

.section--charcoal p {
  color: var(--text-on-dark-secondary);
}

.section--charcoal .section-label {
  color: var(--gold-300);
}

.section--charcoal .btn--outline {
  border-color: rgba(255,255,255,0.2);
  color: var(--gold-300);
}

.section--charcoal .btn--outline:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--gold-300);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1 { font-size: var(--text-5xl); }
  h2 { font-size: var(--text-3xl); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
    --topbar-height: 0;
  }

  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-xl); }

  .container { padding: 0 var(--space-5); }
  .section { padding: var(--space-16) 0; }
  .section--lg { padding: var(--space-20) 0; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .page-header {
    padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-12);
  }

  .page-header p {
    max-width: 100%;
    font-size: var(--text-base);
  }

  .section-label {
    letter-spacing: 0.16em;
    gap: var(--space-3);
  }

  .section-label::before {
    width: 28px;
  }
}

@media (max-width: 480px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }

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

  .section { padding: var(--space-12) 0; }

  .btn--lg {
    padding: 14px 28px;
    font-size: var(--text-sm);
  }

  .btn,
  .btn--sm,
  .btn--lg {
    width: 100%;
  }

  .page-header {
    padding: calc(var(--nav-height) + var(--space-12)) 0 var(--space-10);
  }

  .page-header h1 {
    margin-bottom: var(--space-3);
  }
}