/* ==========================================================================
   Style 02 — Warm Earth
   Rehab Website Factory

   An organic, grounded aesthetic with warm browns, terracotta, and linen
   textures. Conveys warmth, stability, and natural healing.

   Modernized: CSS Nesting, Container Queries, :has(), clamp(),
   @layer, oklch(), color-mix(), scroll-driven animations,
   view transitions, dark mode
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700&family=Source+Sans+Pro:wght@400;600;700&display=swap');

/* --------------------------------------------------------------------------
   Cascade Layers
   -------------------------------------------------------------------------- */
@layer theme, base, components, utilities;

/* --------------------------------------------------------------------------
   Custom Properties Override
   -------------------------------------------------------------------------- */
@layer theme {
  :root {
    /* Colors — oklch for perceptual uniformity */
    --color-primary: oklch(0.48 0.08 55);
    --color-primary-rgb: 139, 90, 43;
    --color-secondary: oklch(0.72 0.06 70);
    --color-secondary-rgb: 196, 167, 125;
    --color-accent: oklch(0.62 0.14 40);
    --color-accent-rgb: 224, 123, 83;
    --color-text: oklch(0.28 0.04 55);
    --color-text-light: #7A6352;
    --color-text-inverse: #FFF8F0;
    --color-bg: #FDF8F3;
    --color-bg-alt: #FFFFFF;
    --color-bg-dark: oklch(0.20 0.04 50);
    --color-border: #E0D0BC;

    /* Typography */
    --font-heading: 'Merriweather', Georgia, serif;
    --font-body: 'Source Sans Pro', sans-serif;
    --font-weight-light: 400;
    --font-weight-normal: 400;
    --font-weight-medium: 600;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Fluid spacing */
    --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
    --space-sm: clamp(0.5rem, 1vw, 1rem);
    --space-md: clamp(1rem, 2vw, 2rem);
    --space-lg: clamp(1.5rem, 3vw, 3rem);
    --space-xl: clamp(2rem, 5vw, 5rem);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* Shadows — warm sepia tint */
    --shadow-sm: 0 1px 4px rgba(139, 90, 43, 0.08);
    --shadow-md: 0 4px 14px rgba(139, 90, 43, 0.1);
    --shadow-lg: 0 8px 28px rgba(139, 90, 43, 0.12);
    --shadow-xl: 0 16px 48px rgba(139, 90, 43, 0.16);

    /* Hero Overlay */
    --hero-overlay: linear-gradient(
      135deg,
      oklch(0.48 0.08 55 / 0.7) 0%,
      oklch(0.72 0.06 70 / 0.4) 50%,
      oklch(0.20 0.04 50 / 0.5) 100%
    );

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
  }

  /* --------------------------------------------------------------------------
     Dark Mode
     -------------------------------------------------------------------------- */
  @media (prefers-color-scheme: dark) {
    :root {
      --color-primary: oklch(0.65 0.08 55);
      --color-secondary: oklch(0.72 0.06 70);
      --color-accent: oklch(0.65 0.12 40);
      --color-text: oklch(0.88 0.02 55);
      --color-text-light: oklch(0.68 0.04 55);
      --color-text-inverse: #1A1008;
      --color-bg: oklch(0.17 0.03 50);
      --color-bg-alt: oklch(0.21 0.03 50);
      --color-bg-dark: oklch(0.12 0.03 50);
      --color-border: oklch(0.35 0.04 55);

      --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.3);
      --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
      --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.4);
      --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);

      --hero-overlay: linear-gradient(
        135deg,
        oklch(0.18 0.04 50 / 0.85) 0%,
        oklch(0.30 0.05 55 / 0.6) 50%,
        oklch(0 0 0 / 0.5) 100%
      );
    }
  }
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
@layer base {
  body {
    background-color: var(--color-bg);
    background-image:
      url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='40' height='40' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E");
    view-transition-name: page-body;
  }

  h1, h2, h3 {
    letter-spacing: -0.01em;
    color: var(--color-text);
  }

  h1 {
    font-weight: var(--font-weight-bold);
    font-size: clamp(2rem, 5vw, 3.5rem);
  }

  h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);

    &::after {
      content: '';
      display: block;
      width: clamp(40px, 8vw, 80px);
      height: 3px;
      background: var(--color-accent);
      margin-top: var(--space-xs);
      border-radius: 1px;
      opacity: 0.7;
    }
  }

  h3 {
    color: var(--color-primary);
    font-size: clamp(1.15rem, 2.5vw, 1.75rem);
  }

  hr {
    border: none;
    border-top: 2px solid var(--color-border);
    background-image: url("data:image/svg+xml,%3Csvg width='80' height='4' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='2' cy='2' r='2' fill='%23C4A77D'/%3E%3Ccircle cx='40' cy='2' r='2' fill='%23E07B53'/%3E%3Ccircle cx='78' cy='2' r='2' fill='%23C4A77D'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.6;
  }

  ::selection {
    background: color-mix(in oklch, var(--color-accent) 20%, transparent);
    color: var(--color-text);
  }
}

/* --------------------------------------------------------------------------
   Component Styles
   -------------------------------------------------------------------------- */
@layer components {
  /* Sections */
  .section--alt {
    background-color: var(--color-bg-alt);
    background-image:
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 50'%3E%3Cpath fill='%23FDF8F3' d='M0,25 Q360,50 720,25 T1440,25 L1440,0 L0,0 Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 100% 50px;
    container-type: inline-size;
  }

  .cta-section.section--alt {
    background-color: var(--color-primary);
    background-image: none;
    color: var(--color-text-inverse);
  }

  .section--dark {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, oklch(0.25 0.04 45) 100%);
    color: var(--color-text-inverse);
  }

  /* Cards — container queries + nesting */
  .card,
  .program-card,
  .contact-card,
  .blog-card,
  .nav-card,
  .sidebar-widget {
    background: var(--color-bg-alt);
    border: 1px solid color-mix(in oklch, var(--color-secondary) 25%, transparent);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    container-type: inline-size;
    view-transition-name: card;

    &:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    & img {
      filter: sepia(8%) saturate(105%);
      transition: filter var(--transition-base);
    }

    &:hover img {
      filter: sepia(0%) saturate(100%);
    }
  }

  /* Container query responsive cards */
  @container (max-width: 300px) {
    .card, .program-card, .blog-card {
      padding: var(--space-sm);
    }
  }

  @container (min-width: 500px) {
    .card, .program-card, .blog-card {
      padding: var(--space-md);
    }
  }

  /* :has() contextual styling */
  section:has(.card) {
    padding-block: var(--space-lg);
  }

  .hero:has(video) {
    min-height: 80vh;
  }

  .card:has(img) {
    overflow: hidden;
  }

  /* Buttons — nesting */
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-outline,
  .btn--phone {
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    font-size: 0.9em;
    transition: all var(--transition-base);
    padding: clamp(0.5rem, 1.2vw, 0.85rem) clamp(1rem, 2.5vw, 2rem);
  }

  .btn-primary,
  .button--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, oklch(0.53 0.07 50) 100%);
    color: var(--color-text-inverse);
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.25);

    &:hover {
      box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.35);
      transform: translateY(-1px);
    }
  }

  .btn-secondary,
  .button--secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);

    &:hover {
      background: color-mix(in oklch, var(--color-primary) 6%, transparent);
    }
  }

  /* Hero */
  .hero,
  .page-hero {
    background-size: cover;
    background-position: center;
    view-transition-name: hero;

    & img {
      filter: sepia(12%) saturate(110%) brightness(95%);
    }
  }

  /* Overlays */
  .mobile-nav-overlay {
    background: rgba(0, 0, 0, 0.5);
  }

  .pd-overlay {
    background: var(--hero-overlay, linear-gradient(135deg, rgba(0,0,0,0.5), rgba(0,0,0,0.3)));
  }

  /* Navigation — nesting */
  .site-header {
    background: var(--color-bg);
    border-bottom: 1px solid color-mix(in oklch, var(--color-secondary) 20%, transparent);
    view-transition-name: header;
  }

  .main-nav a, .mega-nav a, .nav-links a {
    font-family: var(--font-body);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85em;
    color: var(--color-text);
    transition: color var(--transition-fast);

    &:hover {
      color: var(--color-accent);
    }

    &.active {
      color: var(--color-primary);
      border-bottom: 2px solid var(--color-primary);
    }
  }

  .nav-item.active > a {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
  }

  /* Forms — nesting */
  input,
  textarea,
  select {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    background: var(--color-bg-alt);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    padding: clamp(0.5rem, 1vw, 0.75rem) clamp(0.75rem, 1.5vw, 1rem);

    &:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-primary) 12%, transparent);
      outline: none;
    }
  }

  /* Footer — nesting */
  .footer,
  footer {
    background: var(--color-bg-dark);
    color: rgba(255, 248, 240, 0.75);
    view-transition-name: footer;

    & h3 {
      color: #FFFFFF;
    }

    & a {
      color: rgba(255, 248, 240, 0.65);
      transition: color var(--transition-fast);

      &:hover {
        color: var(--color-secondary);
      }
    }
  }

  /* Testimonials */
  blockquote,
  .testimonial,
  .testimonials-grid blockquote {
    padding: var(--space-sm) var(--space-md);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: color-mix(in oklch, var(--color-accent) 6%, transparent);
    font-family: var(--font-heading);
    font-style: italic;
  }

  /* Badges */
  .badge,
  .tag {
    background: color-mix(in oklch, var(--color-primary) 10%, transparent);
    color: var(--color-primary);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-weight: var(--font-weight-semibold);
    font-size: 0.8em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  /* Scrollbar */
  ::-webkit-scrollbar {
    background: var(--color-bg);
  }

  ::-webkit-scrollbar-thumb {
    background: color-mix(in oklch, var(--color-secondary) 40%, transparent);
    border-radius: var(--radius-xl);

    &:hover {
      background: color-mix(in oklch, var(--color-secondary) 60%, transparent);
    }
  }
}

/* Scroll-driven animations intentionally removed (CLAUDE.md mandatory rule).
   Keyframes with opacity:0 starting state caused invisible content on browsers
   that supported animation-timeline but never fired the keyframe. */
@layer utilities {
  @supports (view-transition-name: none) {
    ::view-transition-old(page-body),
    ::view-transition-new(page-body) {
      animation-duration: 0.3s;
    }
    ::view-transition-old(hero),
    ::view-transition-new(hero) {
      animation-duration: 0.4s;
    }
  }
}