/* ==========================================================================
   Style 01 — Calm Ocean
   Rehab Website Factory

   A serene coastal aesthetic with soft blues and gentle wave motifs.
   Evokes tranquility, trust, and the healing power of water.

   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=Lato:wght@300;400;600&family=Open+Sans:wght@300;400;600&display=swap');

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

/* --------------------------------------------------------------------------
   Custom Properties Override
   -------------------------------------------------------------------------- */
@layer theme {
  :root {
    /* Colors — oklch for perceptual uniformity */
    --color-primary: oklch(0.40 0.06 260);
    --color-primary-rgb: 68, 76, 108;
    --color-secondary: oklch(0.72 0.12 75);
    --color-secondary-rgb: 204, 163, 84;
    --color-accent: oklch(0.82 0.08 85);
    --color-accent-rgb: 224, 198, 140;
    --color-text: oklch(0.25 0.02 260);
    --color-text-light: #6B6E7B;
    --color-text-inverse: #FFFFFF;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F7F6F3;
    --color-bg-dark: oklch(0.20 0.04 260);
    --color-border: #D8D5CE;

    /* Typography */
    --font-heading: 'Lato', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 600;

    /* Fluid spacing with clamp */
    --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: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-xl: 20px;

    /* Shadows — soft blue tint */
    --shadow-sm: 0 1px 4px rgba(68, 76, 108, 0.08);
    --shadow-md: 0 4px 14px rgba(68, 76, 108, 0.12);
    --shadow-lg: 0 8px 30px rgba(68, 76, 108, 0.14);
    --shadow-xl: 0 16px 50px rgba(68, 76, 108, 0.18);

    /* Hero Overlay */
    --hero-overlay: linear-gradient(
      135deg,
      oklch(0.40 0.06 260 / 0.75) 0%,
      oklch(0.72 0.12 75 / 0.45) 50%,
      oklch(0 0 0 / 0.15) 100%
    );

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

  /* --------------------------------------------------------------------------
     Dark Mode
     -------------------------------------------------------------------------- */
  @media (prefers-color-scheme: dark) {
    :root {
      --color-primary: oklch(0.60 0.06 260);
      --color-secondary: oklch(0.78 0.10 75);
      --color-accent: oklch(0.40 0.04 260);
      --color-text: oklch(0.90 0.01 260);
      --color-text-light: oklch(0.70 0.02 260);
      --color-text-inverse: #1A1820;
      --color-bg: oklch(0.18 0.02 260);
      --color-bg-alt: oklch(0.22 0.02 260);
      --color-bg-dark: oklch(0.12 0.02 260);
      --color-border: oklch(0.35 0.02 260);

      --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 30px rgba(0, 0, 0, 0.4);
      --shadow-xl: 0 16px 50px rgba(0, 0, 0, 0.5);

      --hero-overlay: linear-gradient(
        135deg,
        oklch(0.20 0.05 220 / 0.85) 0%,
        oklch(0.30 0.05 185 / 0.6) 50%,
        oklch(0 0 0 / 0.4) 100%
      );
    }
  }
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
@layer base {
  body {
    background-color: var(--color-bg, #FFFFFF);
    color: var(--color-text);
    background-image:
      radial-gradient(ellipse at 20% 0%, rgba(var(--color-primary-rgb), 0.04) 0%, transparent 60%),
      radial-gradient(ellipse at 80% 100%, rgba(var(--color-secondary-rgb), 0.04) 0%, transparent 60%);
    view-transition-name: page-body;
  }

  h1, h2, h3 {
    letter-spacing: -0.02em;
    font-size: clamp(1.25rem, 3vw, 3rem);
  }

  h1 {
    font-size: clamp(2rem, 5vw, 4rem);
  }

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

    &::after {
      content: '';
      display: block;
      width: clamp(40px, 8vw, 80px);
      height: 3px;
      background: var(--color-secondary);
      border-radius: 2px;
      margin-top: var(--space-xs);
      opacity: 0.6;
    }
  }

  hr {
    border: none;
    border-top: 1px solid var(--color-border);
    opacity: 0.5;
  }

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

/* --------------------------------------------------------------------------
   Component Styles
   -------------------------------------------------------------------------- */
@layer components {
  /* Wave Section Dividers */
  .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 60'%3E%3Cpath fill='%23FFFFFF' d='M0,30 C360,60 720,0 1440,30 L1440,0 L0,0 Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 100% 60px;
    container-type: inline-size;
  }

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

  .section--dark {
    background-color: var(--color-bg-dark);
    background-image:
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60'%3E%3Cpath fill='%23F8FBFC' d='M0,30 C360,60 720,0 1440,30 L1440,0 L0,0 Z'/%3E%3C/svg%3E"),
      linear-gradient(180deg, var(--color-bg-dark) 0%, #15303E 100%);
    background-repeat: no-repeat, no-repeat;
    background-size: 100% 60px, 100% 100%;
  }

  /* Cards — with container queries */
  .card,
  .program-card,
  .contact-card,
  .blog-card,
  .nav-card {
    background: var(--color-bg);
    border: 1px solid color-mix(in oklch, var(--color-primary) 10%, 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);
    }
  }

  /* 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 */
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-outline,
  .btn--phone {
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.02em;
    box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.2);
    transition: all var(--transition-base);
    padding: clamp(0.5rem, 1.2vw, 0.85rem) clamp(1rem, 2.5vw, 2rem);

    &:hover {
      box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.3);
      transform: translateY(-1px);
    }
  }

  .btn-primary,
  .button--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, oklch(0.63 0.07 215) 100%);
    color: var(--color-text-inverse);
    border-color: transparent;
  }

  .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;
    border-radius: 0;
    view-transition-name: hero;

    &::after {
      background: var(--hero-overlay);
      border-radius: inherit;
    }
  }

  /* Hero text — white over background image + overlay */
  .hero h1 {
    color: var(--color-text-inverse);
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  }

  .hero .hero-sub {
    color: rgba(255, 255, 255, 0.92);
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.25);
  }

  .hero .btn-secondary {
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-primary);
    border-color: rgba(255, 255, 255, 0.95);

    &:hover {
      background: #ffffff;
      border-color: #ffffff;
    }
  }

  /* Page Hero (Inner Pages) — distinct background + strong text */
  .page-hero {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);

    & h1 {
      color: var(--color-text-inverse);
    }

    & p {
      color: rgba(255, 255, 255, 0.9);
    }
  }

  /* Navigation */
  .site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 8px rgba(var(--color-primary-rgb), 0.08);
    view-transition-name: header;
  }

  .main-nav a, .mega-nav a, .nav-links a {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-normal);
    letter-spacing: 0.01em;
    transition: color var(--transition-fast);

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

    &.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);
  }

  /* Dropdown menus */
  .dropdown {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
  }

  .dropdown li a {
    color: var(--color-text);

    &:hover {
      background: var(--color-bg-alt);
      color: var(--color-primary);
    }
  }

  /* Forms */
  input,
  textarea,
  select {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    background: var(--color-bg);
    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) 15%, transparent);
      outline: none;
    }
  }

  /* Footer — with nesting */
  .footer,
  footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.8);
    background-image:
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60'%3E%3Cpath fill='%23FFFFFF' fill-opacity='0.03' d='M0,30 C480,60 960,0 1440,30 L1440,60 L0,60 Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 100% 60px;
    view-transition-name: footer;

    & h3 {
      color: #FFFFFF;
    }

    & a {
      color: rgba(255, 255, 255, 0.7);
      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-secondary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: color-mix(in oklch, var(--color-secondary) 6%, transparent);
    font-style: italic;
    color: var(--color-text);
  }

  /* Badges */
  .badge,
  .tag {
    background: color-mix(in oklch, var(--color-primary) 10%, transparent);
    color: var(--color-primary);
    border-radius: var(--radius-xl);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    font-size: 0.85em;
    letter-spacing: 0.03em;
  }

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

  ::-webkit-scrollbar-thumb {
    background: color-mix(in oklch, var(--color-primary) 30%, transparent);
    border-radius: var(--radius-xl);

    &:hover {
      background: color-mix(in oklch, var(--color-primary) 50%, transparent);
    }
  }
}

/* --------------------------------------------------------------------------
   Animations & Scroll-Driven Effects
   -------------------------------------------------------------------------- */
@layer utilities {
  @keyframes calm-ocean-fade-up {
    from {
      opacity: 0;
      transform: translateY(12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .animate-in,
  [data-animate] {
    animation: calm-ocean-fade-up 0.6s ease-out both;
  }

  /* Scroll-driven animations for supported browsers */
  @supports (animation-timeline: view()) {
    .animate-in,
    [data-animate] {
      animation: calm-ocean-fade-up ease-out both;
      animation-timeline: view();
      animation-range: entry 0% entry 30%;
    }

    .hero {
      animation: calm-ocean-fade-up ease-out both;
      animation-timeline: scroll();
      animation-range: 0% 50%;
    }
  }

  /* View Transitions API */
  @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;
    }
  }
}