/*
  Design Tokens — Document 6 (UI/UX Design System) অনুযায়ী
  নিয়ম: কোনো Component সরাসরি color/spacing hardcode করবে না,
  শুধু এই token ব্যবহার করবে (Governance Rule ২ — Implementation Independence,
  Constitution অনুচ্ছেদ ৬)।
*/

:root {
  /* ===== Color — Light Mode (Default) ===== */
  --color-primary: #1E4D8C;
  --color-primary-hover: #16386A;
  --color-secondary: #6B8CAE;
  --color-background: #FFFFFF;
  --color-surface: #F5F7FA;
  --color-text-primary: #1A1D23;
  --color-text-secondary: #5B6472;
  --color-success: #2E7D32;
  --color-warning: #B26A00;
  --color-error: #C62828;
  --color-border: #E1E5EA;

  /* Primary background-এর উপর বসা টেক্সট/এলিমেন্টের রঙ (যেমন Hero-এর CTA বাটন,
     primary-color background-এর উপর টেক্সট) — hardcoded value এড়ানোর জন্য */
  --color-on-primary: #FFFFFF;
  --color-on-primary-muted: rgba(255, 255, 255, 0.85);

  /* ===== Typography ===== */
  --font-family-base: "Hind Siliguri", "Noto Sans Bengali", system-ui, sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.75rem;
  --font-size-2xl: 2.25rem;
  --font-size-3xl: 3rem;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* ===== Spacing (4px base scale) ===== */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* ===== Radius ===== */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-full: 999px;

  /* ===== Shadow ===== */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);

  /* ===== Animation ===== */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* ===== Breakpoints (রেফারেন্সের জন্য — media query-তে সরাসরি ব্যবহার হবে) ===== */
  /* sm: 640px, md: 768px, lg: 1024px, xl: 1280px — Document 6, অনুচ্ছেদ ৭ */
}

/* ===== Color — Dark Mode ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #14161A;
    --color-surface: #1E2126;
    --color-text-primary: #F0F2F5;
    --color-text-secondary: #A7AEB8;
    --color-border: #2C303A;
    --color-primary: #5B8FD4;
    --color-primary-hover: #7BA6E0;
  }
}

/* Manual override হলে এই class body-তে বসবে (JS দিয়ে টগল হবে) */
[data-theme="dark"] {
  --color-background: #14161A;
  --color-surface: #1E2126;
  --color-text-primary: #F0F2F5;
  --color-text-secondary: #A7AEB8;
  --color-border: #2C303A;
  --color-primary: #5B8FD4;
  --color-primary-hover: #7BA6E0;
}
[data-theme="light"] {
  --color-background: #FFFFFF;
  --color-surface: #F5F7FA;
  --color-text-primary: #1A1D23;
  --color-text-secondary: #5B6472;
  --color-border: #E1E5EA;
  --color-primary: #1E4D8C;
  --color-primary-hover: #16386A;
}

/* ===== Reduced Motion (Accessibility, Document 6 অনুচ্ছেদ ৯) ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}