/* ============================================
   NexusCove Design System — Core Styles
   ============================================
   
   This stylesheet is the SINGLE SOURCE OF TRUTH
   for all shared tokens, base styles, and components.
   
   Brand tokens match: branding/brand-tokens.css
   Rules follow:       branding/STYLE_GUIDE.md
   ============================================ */

/* ----- Fonts ----- */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&display=swap');

/* ----- CSS Custom Properties (Design Tokens) ----- */
:root {

  /* ---- Brand Colours ---- */
  --brand-primary:          #4862B8;
  --brand-primary-light:    #779ECA;
  --brand-primary-dark:     #3a4f94;
  --brand-gradient:         linear-gradient(135deg, #4862B8 0%, #779ECA 100%);
  --brand-gradient-subtle:  linear-gradient(135deg, rgba(72,98,184,0.08) 0%, rgba(119,158,202,0.08) 100%);

  /* ---- Aliases (legacy — kept for compatibility) ---- */
  --primary-color:          #4862B8;
  --primary-dark:           #3a4f94;
  --secondary-color:        #779ECA;

  /* ---- Semantic Colours ---- */
  --success-color:          #10b981;
  --warning-color:          #f59e0b;
  --danger-color:           #ef4444;

  /* ---- Surfaces & Layout ---- */
  --bg-color:               #f7f8fb;
  --surface-color:          #ffffff;
  --border-color:           #e2e5ec;

  /* ---- Text ---- */
  --text-primary:           #18191B;
  --text-secondary:         #5a6170;

  /* ---- Typography ---- */
  --font-family-base:    'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono:    'Fira Code', 'Courier New', monospace;
  --font-size-xs:   0.75rem;   /* 12px — badges, tags */
  --font-size-sm:   0.85rem;   /* ~14px — small / meta */
  --font-size-base: 0.95rem;   /* ~15px — body text */
  --font-size-lg:   1.1rem;    /* ~18px — card headings */
  --font-size-xl:   1.35rem;   /* ~22px — section headings */
  --font-size-2xl:  1.75rem;   /* ~28px — larger headings */
  --font-size-3xl:  2rem;      /* 32px — page titles */

  /* ---- Spacing ---- */
  --spacing-1:  0.25rem;  /* 4px  */
  --spacing-2:  0.5rem;   /* 8px  */
  --spacing-3:  0.75rem;  /* 12px */
  --spacing-4:  1rem;     /* 16px */
  --spacing-5:  1.25rem;  /* 20px */
  --spacing-6:  1.5rem;   /* 24px */
  --spacing-8:  2rem;     /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */

  /* ---- Border Radius ---- */
  --radius:      10px;    /* Standard — buttons, inputs, cards */
  --radius-lg:   14px;    /* Large cards, form containers */
  --radius-sm:   6px;     /* Small badges, tags */
  --radius-full: 9999px;  /* Pills */

  /* ---- Shadows ---- */
  --shadow:     0 1px 3px 0 rgba(72, 98, 184, 0.06),
                0 1px 2px -1px rgba(72, 98, 184, 0.06);
  --shadow-lg:  0 10px 25px -5px rgba(72, 98, 184, 0.1),
                0 8px 10px -6px rgba(72, 98, 184, 0.06);
  --shadow-float: 0 20px 60px rgba(0,0,0,0.18),
                  0 2px 12px rgba(0,0,0,0.06);

  /* ---- CTA Glow ---- */
  --shadow-cta:       0 4px 14px rgba(72, 98, 184, 0.3);
  --shadow-cta-hover: 0 6px 20px rgba(72, 98, 184, 0.4);

  /* ---- Transitions ---- */
  --transition-fast:   150ms ease;
  --transition-base:   200ms ease;
  --transition-slow:   350ms ease;

  /* ---- Z-Index Scale ---- */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-overlay:  300;
  --z-modal:    400;
  --z-toast:    500;

  /* ---- Dark Theme (landing page only) ---- */
  --dark-bg:            #0d1117;
  --dark-text:          #ffffff;
  --dark-accent:        #779ECA;
  --dark-card-bg:       rgba(255, 255, 255, 0.03);
  --dark-card-border:   rgba(255, 255, 255, 0.06);
  --dark-muted:         rgba(255, 255, 255, 0.5);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-color);
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--brand-primary-dark);
}

/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}
h1 { font-size: var(--font-size-3xl); font-weight: 800; margin-bottom: var(--spacing-6); }
h2 { font-size: var(--font-size-2xl); margin-bottom: var(--spacing-5); }
h3 { font-size: var(--font-size-lg);  margin-bottom: var(--spacing-4); }
h4 { font-size: var(--font-size-base); margin-bottom: var(--spacing-3); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--text-primary);
}

small, .text-sm { font-size: var(--font-size-sm); }
.text-muted      { color: var(--text-secondary); }

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-5);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.15s;
  text-decoration: none;
}
.btn:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #fff;
  box-shadow: var(--shadow-cta);
}
.btn-primary:hover {
  background-color: var(--brand-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-cta-hover);
}

.btn-secondary {
  background-color: var(--brand-primary-light);
  color: #fff;
}
.btn-secondary:hover {
  background-color: var(--brand-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}
.btn-outline:hover {
  background-color: var(--brand-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-sm { padding: var(--spacing-1) var(--spacing-3); font-size: var(--font-size-sm); }
.btn-lg { padding: var(--spacing-3) var(--spacing-8); font-size: var(--font-size-lg); }

/* ----- Form Inputs ----- */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(72, 98, 184, 0.15);
}

.input.is-error { border-color: var(--danger-color); }
.input.is-success { border-color: var(--success-color); }

label {
  display: block;
  margin-bottom: var(--spacing-1);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

/* ----- Cards ----- */
.card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow);
  transition: all 0.2s ease;
}
.card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

/* ----- Badges ----- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  line-height: 1;
}
.badge-primary  { background: rgba(72, 98, 184, 0.1);  color: var(--brand-primary); }
.badge-success  { background: rgba(16, 185, 129, 0.1); color: var(--success-color); }
.badge-warning  { background: rgba(245, 158, 11, 0.1); color: var(--warning-color); }
.badge-error    { background: rgba(239, 68, 68, 0.1);  color: var(--danger-color); }

/* ----- Utility Classes ----- */
.container {
  width: 100%;
  max-width: 1000px;
  margin-inline: auto;
  padding-inline: var(--spacing-4);
}
.container-wide {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: var(--spacing-4);
}

.flex       { display: flex; }
.flex-col   { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

.text-center { text-align: center; }
.mt-4  { margin-top: var(--spacing-4); }
.mb-4  { margin-bottom: var(--spacing-4); }
.p-4   { padding: var(--spacing-4); }
.p-6   { padding: var(--spacing-6); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----- Keyframe Animations ----- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes slideIn {
  from { transform: translateX(400px); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
  .container,
  .container-wide {
    padding-inline: var(--spacing-4);
  }

  body {
    padding: var(--spacing-4);
  }
}