/* ==========================================================================
   Style 06 — Modern Minimal
   Rehab Website Factory

   A stark, high-contrast monochromatic design with bold typography as the
   primary design element. Communicates clarity, modernity, and confidence.

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

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700;900&family=Inter:wght@400;500;700&display=swap');

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

/* --------------------------------------------------------------------------
   Custom Properties Override
   -------------------------------------------------------------------------- */
@layer theme {
  :root {
    /* Colors — oklch */
    --color-primary: oklch(0 0 0);
    --color-primary-rgb: 0, 0, 0;
    --color-secondary: oklch(0.30 0 0);
    --color-secondary-rgb: 51, 51, 51;
    --color-accent: oklch(0.55 0.22 260);
    --color-accent-rgb: 0, 102, 255;
    --color-text: oklch(0.10 0 0);
    --color-text-light: #777777;
    --color-text-inverse: oklch(1 0 0);
    --color-bg: oklch(1 0 0);
    --color-bg-alt: oklch(0.98 0 0);
    --color-bg-dark: oklch(0 0 0);
    --color-border: oklch(0.90 0 0);

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-weight-light: 400;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 700;
    --font-weight-bold: 900;

    /* 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 — almost none */
    --radius-sm: 0px;
    --radius-md: 2px;
    --radius-lg: 4px;
    --radius-xl: 4px;

    /* Shadows — none by default */
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --shadow-xl: 0 0 0 1px rgba(0, 0, 0, 0.1);

    /* Hero Overlay */
    --hero-overlay: linear-gradient(
      180deg,
      oklch(0 0 0 / 0.7) 0%,
      oklch(0 0 0 / 0.4) 100%
    );

    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.4s ease;
  }

  /* --------------------------------------------------------------------------
     Dark Mode — inverted minimal
     -------------------------------------------------------------------------- */
  @media (prefers-color-scheme: dark) {
    :root {
      --color-primary: oklch(1 0 0);
      --color-primary-rgb: 255, 255, 255;
      --color-secondary: oklch(0.75 0 0);
      --color-accent: oklch(0.65 0.22 260);
      --color-text: oklch(0.92 0 0);
      --color-text-light: oklch(0.55 0 0);
      --color-text-inverse: oklch(0 0 0);
      --color-bg: oklch(0.08 0 0);
      --color-bg-alt: oklch(0.12 0 0);
      --color-bg-dark: oklch(0 0 0);
      --color-border: oklch(0.22 0 0);

      --shadow-xl: 0 0 0 1px rgba(255, 255, 255, 0.1);

      --hero-overlay: linear-gradient(
        180deg,
        oklch(0 0 0 / 0.8) 0%,
        oklch(0 0 0 / 0.5) 100%
      );
    }
  }
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
@layer base {
  /* FIX: Added missing body selector */
  body {
    background-color: var(--color-bg);
    view-transition-name: page-body;
  }

  h1 {
    font-weight: 900;
    letter-spacing: -0.04em;
    text-transform: uppercase;
    line-height: 0.95;
    font-size: clamp(2.5rem, 7vw, 5rem);
  }

  h2 {
    font-weight: 900;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    font-size: clamp(1.75rem, 4vw, 3rem);

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

  h3 {
    font-weight: 700;
    letter-spacing: -0.02em;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  }

  h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.01em;
  }

  hr {
    border: none;
    border-top: 1px solid var(--color-border);
  }

  ::selection {
    background: var(--color-accent);
    color: var(--color-text-inverse);
  }
}

/* --------------------------------------------------------------------------
   Component Styles
   -------------------------------------------------------------------------- */
@layer components {
  /* Sections */
  .section--alt {
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    container-type: inline-size;
  }

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

  .section--dark {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
  }

  /* Cards — container queries + nesting */
  .card,
  .program-card,
  .contact-card,
  .blog-card,
  .nav-card,
  .sidebar-widget {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
    container-type: inline-size;
    view-transition-name: card;

    &:hover {
      border-color: var(--color-primary);
    }
  }

  @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: 90vh;
  }

  .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-heading);
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: clamp(0.75em, 1vw, 0.85em);
    transition: all var(--transition-base);
    padding: clamp(0.5rem, 1.2vw, 0.85rem) clamp(1rem, 2.5vw, 2rem);
  }

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

    &:hover {
      background: var(--color-text-inverse);
      color: var(--color-primary);
    }
  }

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

    &:hover {
      background: var(--color-primary);
      color: var(--color-text-inverse);
    }
  }

  .btn-accent,
  .button--accent {
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border: 2px solid var(--color-accent);

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

  /* Links */
  a {
    color: var(--color-accent);
    text-decoration: none;
    transition: opacity var(--transition-fast);

    &:hover {
      opacity: 0.7;
    }
  }

  /* Navigation — nesting */
  .site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    view-transition-name: header;
  }

  .main-nav a, .mega-nav a, .nav-links a {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.8em;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
    transition: color var(--transition-fast);

    &:hover {
      color: var(--color-primary);
      opacity: 1;
    }

    &.active {
      color: var(--color-primary);
      opacity: 1;
    }
  }

  .nav-item.active > a {
    color: var(--color-primary);
  }

  /* Forms — nesting */
  input,
  textarea,
  select {
    border: none;
    border-bottom: 2px solid var(--color-border);
    border-radius: 0;
    font-family: var(--font-body);
    background: transparent;
    color: var(--color-text);
    transition: border-color var(--transition-fast);
    padding: clamp(0.5rem, 1vw, 0.75rem) 0;

    &:focus {
      border-bottom-color: var(--color-primary);
      box-shadow: 0 2px 0 0 var(--color-primary);
      outline: none;
    }
  }

  label {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.75em;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
  }

  /* Footer — nesting */
  .footer,
  footer {
    background: var(--color-bg-dark);
    color: color-mix(in oklch, white 60%, transparent);
    view-transition-name: footer;

    & h3 {
      color: #FFFFFF;
    }

    & a {
      color: color-mix(in oklch, white 50%, transparent);
      transition: color var(--transition-fast);

      &:hover {
        color: var(--color-text-inverse);
        opacity: 1;
      }
    }
  }

  /* Blockquote */
  blockquote,
  .testimonial,
  .testimonials-grid blockquote {
    padding: var(--space-sm) var(--space-md);
    border-left: 4px solid var(--color-primary);
    font-family: var(--font-heading);
    font-weight: 700;
    font-style: normal;
    font-size: clamp(1em, 1.5vw, 1.1em);
    letter-spacing: -0.01em;
    color: var(--color-text);
  }

  /* Badges */
  .badge,
  .tag {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-radius: 0;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.7em;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  /* Monochrome images */
  .card img,
  .program-card img,
  .blog-card img {
    filter: grayscale(100%) contrast(1.1);
    transition: filter var(--transition-base);
  }

  .card:hover img,
  .program-card:hover img,
  .blog-card:hover img {
    filter: grayscale(0%) contrast(1);
  }

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

  ::-webkit-scrollbar-thumb {
    background: var(--color-border);

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

/* --------------------------------------------------------------------------
   Animations & Scroll-Driven Effects
   -------------------------------------------------------------------------- */
@layer utilities {
  @keyframes minimal-fade {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  .animate-in,
  [data-animate] {
    animation: minimal-fade 0.3s ease both;
  }

  @supports (animation-timeline: view()) {
    .animate-in,
    [data-animate] {
      animation: minimal-fade ease both;
      animation-timeline: view();
      animation-range: entry 0% entry 20%;
    }
  }

  @supports (view-transition-name: none) {
    ::view-transition-old(page-body),
    ::view-transition-new(page-body) {
      animation-duration: 0.2s;
    }

    ::view-transition-old(header),
    ::view-transition-new(header) {
      animation-duration: 0.15s;
    }
  }
}