:root {
  /* Colors */
  --color-primary: #111B57; /* Xanh navy chủ đạo */
  --color-cta: #ED1C24; /* Đỏ CTA */
  --color-bg-light: #F7F8FA; /* Trắng khoáng */
  --color-text: #20242A; /* Graphite */
  --color-border: #E6E9EF; /* Xám viền */
  --color-white: #FFFFFF;
  --color-black: #000000;

  /* Typography */
  /* Typography */
  --font-primary: 'Mulish', sans-serif; /* Font mềm, thanh lịch */
  --font-secondary: 'Playfair Display', serif; /* Font chữ ký, quote (nếu cần) */
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-h1: clamp(32px, 5vw, 46px);
  --font-size-h2: clamp(28px, 4vw, 25px);
  --font-size-h3: clamp(24px, 3vw, 32px);
  --font-size-h4: clamp(20px, 2vw, 24px);
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --line-height-base: 1.5;
  --line-height-heading: 1.2;
  /* =========================================
   ÉP FONT MỀM CHO TOÀN BỘ HEADING
   ========================================= */
  h1, h2, h3, h4, h5, h6, 
  .heading-primary, 
  .heading-secondary {
    font-family: var(--font-primary) !important;
  }

  /* Layout & Container */
  --container-max-width: 1440px;
  --container-padding: clamp(15px, 3vw, 40px); 
  --grid-gap: 24px;

  /* Spacing */
  --spacing-section: clamp(20px, 8vw, 20px);
  --spacing-xl: 48px;
  --spacing-lg: 32px;
  --spacing-md: 24px;
  --spacing-sm: 16px;
  --spacing-xs: 8px;

  /* Border & Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-width: 1px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(32, 36, 42, 0.05);
  --shadow-md: 0 4px 16px rgba(32, 36, 42, 0.08);
  --shadow-hover: 0 12px 24px rgba(32, 36, 42, 0.12);

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;

  /* Z-index */
  --z-index-dropdown: 100;
  --z-index-sticky: 500;
  --z-index-header: 1000;
  --z-index-modal: 2000;
  --z-index-toast: 3000;
}

/* Breakpoints tham chiếu (Media Queries - Không viết vào :root) */
/* 
  Mobile small: < 480px 
  Mobile: < 768px 
  Tablet: 768px - 991px 
  Laptop: 992px - 1199px 
  Desktop: >= 1200px 
*/