/* Art direction: Premium real estate operations consultancy → Authoritative, boutique, premium
   Palette: Deep charcoal/navy dark surfaces, warm cream/off-white light, refined gold accent
   Typography: Cormorant (display, serif — elegance/authority) + Satoshi (body, sans — clean modernity)
   Density: Spacious — editorial feel, generous white space = confidence */

/* ========================================
   DESIGN TOKENS
   ======================================== */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* 4px Spacing System */
  --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: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Font Families */
  --font-display: 'Cormorant', 'Georgia', serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ========================================
   LIGHT MODE (Default)
   ======================================== */

:root, [data-theme="light"] {
  /* Surfaces — warm cream/off-white */
  --color-bg:               #faf9f6;
  --color-surface:          #f5f3ef;
  --color-surface-2:        #efede9;
  --color-surface-offset:   #e8e5df;
  --color-surface-offset-2: #dfdcd6;
  --color-surface-dynamic:  #d6d3cd;
  --color-divider:          #ccc9c3;
  --color-border:           #c2bfb9;

  /* Text */
  --color-text:           #1a1f2e;
  --color-text-muted:     #5c6070;
  --color-text-faint:     #9a9da8;
  --color-text-inverse:   #faf9f6;

  /* Primary Accent — Refined Gold */
  --color-primary:          #b8973a;
  --color-primary-hover:    #9a7e2e;
  --color-primary-active:   #7d6624;
  --color-primary-highlight: #f0e8d0;

  /* Error */
  --color-error:          #a13544;
  --color-error-hover:    #872c3a;
  --color-error-active:   #6c2330;
  --color-error-highlight: #f0dede;

  /* Success */
  --color-success:        #437a22;
  --color-success-hover:  #2e5c10;
  --color-success-active: #1e3f0a;
  --color-success-highlight: #e0eecc;

  /* Shadows (warm-tinted) */
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

/* ========================================
   DARK MODE
   ======================================== */

[data-theme="dark"] {
  /* Surfaces — deep charcoal/navy */
  --color-bg:               #0f1219;
  --color-surface:          #151a24;
  --color-surface-2:        #1a1f2e;
  --color-surface-offset:   #1f2538;
  --color-surface-offset-2: #252c42;
  --color-surface-dynamic:  #2d3550;
  --color-divider:          #2a3148;
  --color-border:           #343c56;

  /* Text */
  --color-text:           #e8e6e1;
  --color-text-muted:     #9a9db0;
  --color-text-faint:     #5c6080;
  --color-text-inverse:   #0f1219;

  /* Primary Accent — Gold (brighter for dark bg) */
  --color-primary:          #d4b04a;
  --color-primary-hover:    #e0c060;
  --color-primary-active:   #c49e3a;
  --color-primary-highlight: #2a2618;

  /* Error */
  --color-error:          #dd6974;
  --color-error-hover:    #c24a59;
  --color-error-active:   #a53142;
  --color-error-highlight: #3a2028;

  /* Success */
  --color-success:        #6daa45;
  --color-success-hover:  #4d8f25;
  --color-success-active: #387015;
  --color-success-highlight: #1e2e18;

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:               #0f1219;
    --color-surface:          #151a24;
    --color-surface-2:        #1a1f2e;
    --color-surface-offset:   #1f2538;
    --color-surface-offset-2: #252c42;
    --color-surface-dynamic:  #2d3550;
    --color-divider:          #2a3148;
    --color-border:           #343c56;
    --color-text:           #e8e6e1;
    --color-text-muted:     #9a9db0;
    --color-text-faint:     #5c6080;
    --color-text-inverse:   #0f1219;
    --color-primary:          #d4b04a;
    --color-primary-hover:    #e0c060;
    --color-primary-active:   #c49e3a;
    --color-primary-highlight: #2a2618;
    --color-error:          #dd6974;
    --color-error-hover:    #c24a59;
    --color-error-active:   #a53142;
    --color-error-highlight: #3a2028;
    --color-success:        #6daa45;
    --color-success-hover:  #4d8f25;
    --color-success-active: #387015;
    --color-success-highlight: #1e2e18;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ========================================
   COMPONENT STYLES
   ======================================== */

/* Container */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-8); }
}

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

/* Section spacing */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-32));
}

/* Typography */
.display-heading {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.body-text {
  font-family: var(--font-body);
  font-weight: 400;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  padding: var(--space-4) var(--space-8);
  min-height: 48px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: none;
  position: relative;
  overflow: visible;
  -webkit-tap-highlight-color: transparent;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              border-color var(--transition-interactive);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-primary:active {
  background: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-muted);
}

.btn-secondary:active {
  background: var(--color-surface-2);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid transparent;
  padding: var(--space-2) var(--space-4);
}

.btn-ghost:hover {
  background: var(--color-primary-highlight);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

/* Form inputs */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.form-input::placeholder {
  color: var(--color-text-faint);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

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

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

/* Divider */
.divider {
  border: none;
  height: 1px;
  background: var(--color-divider);
  margin-block: var(--space-8);
}

/* Scroll reveal animations — JS toggles .is-hidden → .is-visible */
.fade-in,
.reveal-up {
  opacity: 1;
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              clip-path 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.is-hidden {
  opacity: 0;
}

.reveal-up.is-hidden {
  opacity: 0;
  clip-path: inset(100% 0 0 0);
}

.fade-in.is-visible,
.reveal-up.is-visible {
  opacity: 1;
  clip-path: inset(0 0 0 0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .reveal-up {
    transition: none;
  }
  .fade-in.is-hidden,
  .reveal-up.is-hidden {
    opacity: 1;
    clip-path: none;
  }
}

/* Gold accent line */
.accent-line {
  width: 48px;
  height: 2px;
  background: var(--color-primary);
}

/* Text colors */
.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-primary { color: var(--color-primary); }