/* ==========================================================================
   Fikra (فِكْرة) — base.css
   Design tokens, modern reset, Arabic typography foundation, accessibility
   ========================================================================== */

:root {
  /* Color Palette — Calm, high-contrast, white-first editorial utility */
  --color-bg: #ffffff;
  --color-surface-subtle: #f7f9fc;
  --color-surface-card: #ffffff;
  --color-surface-tint: #eef4fb;
  --color-surface-tint-strong: #dfeaf8;

  --color-text-primary: #0f172a;
  --color-text-secondary: #334155;
  --color-text-muted: #475569;

  --color-primary: #1b4f9c;
  --color-primary-hover: #143d7a;
  --color-primary-active: #0f2f5f;
  --color-on-primary: #ffffff;

  --color-border: #dce4ee;
  --color-border-strong: #bcc9da;
  --color-border-focus: #1b4f9c;

  --color-badge-bg: #f1f5f9;
  --color-badge-border: #cbd5e1;
  --color-badge-text: #334155;

  /* Native Arabic Typography Stack — zero external fonts */
  --font-sans: system-ui, -apple-system, "Segoe UI", "Geeza Pro", "SF Arabic",
    Tahoma, "Noto Sans Arabic", "DejaVu Sans", Arial, sans-serif;

  /* Fluid Type Scale via clamp() */
  --text-xs: clamp(0.8125rem, 0.79rem + 0.12vw, 0.875rem);
  --text-sm: clamp(0.9rem, 0.87rem + 0.15vw, 0.96875rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.09375rem);
  --text-lg: clamp(1.125rem, 1.06rem + 0.3vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.45vw, 1.45rem);
  --text-2xl: clamp(1.5rem, 1.32rem + 0.85vw, 1.95rem);
  --text-3xl: clamp(1.85rem, 1.52rem + 1.55vw, 2.65rem);

  --leading-tight: 1.35;
  --leading-snug: 1.5;
  --leading-relaxed: 1.8;

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Layout Metrics */
  --container-max: 70rem;
  --container-narrow: 48rem;
  --container-gutter: clamp(1.25rem, 4vw, 3rem);

  /* Radii & Subtle Elevation */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 999rem;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-focus: 0 0 0 3px rgba(27, 79, 156, 0.2);

  /* Motion — short, purposeful */
  --transition-fast: 150ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-sans);
  font-size: 100%;
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-block-size: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  letter-spacing: 0;
  overflow-x: clip;
}

main {
  flex: 1 0 auto;
  display: block;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote {
  margin-block: 0;
  margin-inline: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  font-weight: 700;
  letter-spacing: 0;
  text-wrap: balance;
}

p {
  color: var(--color-text-secondary);
  max-inline-size: 66ch;
  text-wrap: pretty;
}

ul,
ol {
  padding-inline-start: 0;
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.22em;
  transition: color var(--transition-fast), background-color var(--transition-fast),
    border-color var(--transition-fast);
}

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

img,
svg {
  display: block;
  max-inline-size: 100%;
  block-size: auto;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  letter-spacing: 0;
}

button {
  cursor: pointer;
}

/* Remove default WebKit search cancel decoration so custom accessible control stays consistent */
input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

/* Clear, unmistakable keyboard focus indicators */
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 3px;
}

/* Programmatically focused landmark targets */
section[tabindex="-1"]:focus,
main[tabindex="-1"]:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}

/* Accessible Skip Link */
.skip-link {
  position: fixed;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  z-index: 1000;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.skip-link:focus,
.skip-link:focus-visible {
  inline-size: auto;
  block-size: auto;
  padding-block: var(--space-2);
  padding-inline: var(--space-4);
  overflow: visible;
  clip-path: none;
  color: var(--color-on-primary);
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

/* Screen-reader-only utility using logical properties */
.visually-hidden {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}