/* ==========================================================================
   MK Dental & Orthodontics - Design Tokens & CSS Variables
   ========================================================================== */

:root {
  /* ── Color System ─────────────────────────────────────────────────────── */

  /* Primary Accent - Golden Yellow (inspired by clinic interior) */
  --color-primary: #E8C63A;
  --color-primary-light: #F2D968;
  --color-primary-dark: #C9A82E;
  --color-primary-rgb: 232, 198, 58;

  /* Secondary Accent - Mint Green */
  --color-secondary: #5F9E82;
  --color-secondary-light: #7BB89C;
  --color-secondary-dark: #4A8068;
  --color-secondary-rgb: 95, 158, 130;

  /* Neutral - Medical Grey */
  --color-neutral: #D6DCE2;
  --color-neutral-light: #E8ECF0;
  --color-neutral-dark: #B8C0C8;

  /* Backgrounds */
  --color-bg: #F8FAFC;
  --color-bg-white: #FFFFFF;
  --color-bg-alt: #F1F5F9;
  --color-bg-dark: #1E293B;

  /* Text Colors */
  --color-text-primary: #2C2C2C;
  --color-text-secondary: #6B7280;
  --color-text-tertiary: #9CA3AF;
  --color-text-inverse: #FFFFFF;

  /* Functional Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* ── Typography ──────────────────────────────────────────────────────── */

  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Font Sizes - Fluid Typography */
  --fs-display: clamp(2.5rem, 5vw, 4.5rem);
  --fs-h1: clamp(2rem, 4vw, 3.5rem);
  --fs-h2: clamp(1.75rem, 3.5vw, 3rem);
  --fs-h3: clamp(1.5rem, 2.5vw, 2rem);
  --fs-h4: clamp(1.25rem, 2vw, 1.5rem);
  --fs-h5: clamp(1.1rem, 1.5vw, 1.25rem);
  --fs-body-lg: 1.125rem;
  --fs-body: 1rem;
  --fs-body-sm: 0.875rem;
  --fs-caption: 0.75rem;

  /* Font Weights */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Line Heights */
  --lh-tight: 1.2;
  --lh-normal: 1.6;
  --lh-relaxed: 1.8;

  /* Letter Spacing */
  --ls-tight: -0.02em;
  --ls-normal: 0;
  --ls-wide: 0.02em;
  --ls-wider: 0.05em;

  /* ── Spacing Scale ───────────────────────────────────────────────────── */

  --space-2xs: 0.25rem;   /* 4px */
  --space-xs: 0.5rem;     /* 8px */
  --space-sm: 0.75rem;    /* 12px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-4xl: 6rem;      /* 96px */
  --space-5xl: 8rem;      /* 128px */

  /* Section Spacing */
  --section-padding: clamp(4rem, 8vw, 8rem);
  --container-max: 1200px;
  --container-wide: 1400px;
  --container-narrow: 800px;

  /* ── Border Radius ───────────────────────────────────────────────────── */

  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* ── Shadows ─────────────────────────────────────────────────────────── */

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.16);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);

  /* Colored Shadows */
  --shadow-primary: 0 8px 24px rgba(232, 198, 58, 0.25);
  --shadow-secondary: 0 8px 24px rgba(95, 158, 130, 0.2);

  /* ── Transitions ─────────────────────────────────────────────────────── */

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 600ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ── Z-Index Scale ───────────────────────────────────────────────────── */

  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 300;
  --z-overlay: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;

  /* ── Layout ──────────────────────────────────────────────────────────── */

  --header-height: 90px;
  --header-height-scrolled: 70px;

  /* ── Glass Effect ────────────────────────────────────────────────────── */

  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(12px);
}

/* Dark mode overrides (if needed in future) */
@media (prefers-color-scheme: dark) {
  :root {
    /* Reserved for future dark mode implementation */
  }
}