/* ═══════════════════════════════════════════════════════════════
   BIO SCIENCE — Design Tokens (علوم متكاملة · أحياء)
   لوحة دافئة: برتقالي/أصفر مهيمن + لمسة زرقاء
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Warm orange brand ramp */
  --brand-950: #7c2d12;
  --brand-900: #9a3412;
  --brand-800: #c2410c;
  --brand-700: #ea580c;
  --brand-600: #f97316;
  --brand-500: #fb923c;
  --brand-400: #fdba74;
  --brand-300: #fed7aa;
  --brand-100: rgba(249, 115, 22, 0.10);
  --brand-50:  rgba(249, 115, 22, 0.05);

  /* Warm multi-accent + little blue */
  --accent: #f97316;
  --accent-soft: rgba(249, 115, 22, 0.12);
  --accent-violet: #2563eb;
  --accent-cyan: #f59e0b;
  --accent-amber: #fbbf24;
  --accent-green: #22c55e;

  --page-bg: #fffdf7;
  --page-bg-alt: #fff7ed;
  --card-bg: #ffffff;
  --card: #ffffff;
  --card-bg-strong: #ffffff;
  --card-soft: #fff3e2;

  --surface-soft: rgba(249, 115, 22, 0.06);
  --surface-strong: rgba(245, 158, 11, 0.12);
  --surface-highlight: rgba(37, 99, 235, 0.08);
  --surface-highlight-strong: rgba(249, 115, 22, 0.14);

  --text: #33200f;
  --text-strong: #26150a;
  --muted: #8a6a4a;
  --muted-strong: #6b4f37;

  --border: rgba(120, 53, 15, 0.12);
  --border-strong: rgba(249, 115, 22, 0.32);
  --brand-border: var(--border);
  --shadow: 0 10px 34px rgba(249, 115, 22, 0.14);
  --shadow-soft: 0 4px 16px rgba(249, 115, 22, 0.10);
  --shadow-strong: 0 24px 56px rgba(234, 88, 12, 0.20);

  --primary: #ea580c;
  --primary-strong: #c2410c;
  --primary-weak: rgba(249, 115, 22, 0.10);

  --field-bg: #ffffff;
  --field-text: var(--text);
  --field-border: rgba(120, 53, 15, 0.18);

  --btn-solid-bg: linear-gradient(135deg, #f97316 0%, #fbbf24 100%);
  --btn-solid-text: #ffffff;

  --success: #22c55e;
  --danger: #f43f5e;
  --warning: #f59e0b;

  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --sw-bg: #fde68a;
  --sw-knob: #ffffff;

  --hdr-bg: linear-gradient(135deg, #ea580c 0%, #f97316 50%, #fbbf24 100%);
  --hdr-text: #ffffff;
  --hdr-border: rgba(255, 255, 255, 0.28);
  --hdr-fade: transparent;

  --grid-line: rgba(249, 115, 22, 0.08);
  --page-glow-1: rgba(249, 115, 22, 0.10);
  --page-glow-2: rgba(37, 99, 235, 0.06);

  --grad-brand: linear-gradient(135deg, #f97316, #fbbf24);
  --grad-hero: linear-gradient(135deg, #fff7ed, #fffbeb 55%, #fff1e0);

  --font-display: 'Alexandria', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans Arabic', 'Alexandria', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --studio-sidebar-w: 260px;
  --studio-header-h: 64px;

  color-scheme: light;
}

html[data-theme="dark"] {
  --page-bg: #1a1206;
  --page-bg-alt: #241708;
  --card-bg: #241a0e;
  --card: #241a0e;
  --card-bg-strong: #2f2110;
  --card-soft: #1f1508;

  --surface-soft: rgba(251, 191, 36, 0.08);
  --surface-strong: rgba(249, 115, 22, 0.16);
  --surface-highlight: rgba(96, 165, 250, 0.12);
  --surface-highlight-strong: rgba(251, 191, 36, 0.18);

  --text: #fdf6ec;
  --text-strong: #ffffff;
  --muted: #d8c3a8;
  --muted-strong: #ece0cf;

  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(251, 191, 36, 0.34);
  --brand-border: var(--border);
  --shadow: 0 12px 34px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.30);
  --shadow-strong: 0 24px 56px rgba(0, 0, 0, 0.55);

  --primary: #fbbf24;
  --primary-strong: #fcd34d;
  --primary-weak: rgba(251, 191, 36, 0.16);

  --accent-soft: rgba(249, 115, 22, 0.20);

  --field-bg: #1f1508;
  --field-text: #ece0cf;
  --field-border: rgba(255, 255, 255, 0.14);

  --btn-solid-bg: linear-gradient(135deg, #f97316 0%, #fbbf24 100%);
  --btn-solid-text: #ffffff;

  --hdr-bg: linear-gradient(135deg, #9a3412 0%, #c2410c 55%, #b45309 100%);
  --hdr-border: rgba(255, 255, 255, 0.16);

  --grid-line: rgba(251, 191, 36, 0.10);
  --grad-hero: linear-gradient(160deg, #241708 0%, #1a1206 100%);

  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-y: auto;
  height: auto;
  min-height: 100%;
  -webkit-overflow-scrolling: touch;
}

html, body {
  height: auto;
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--page-bg);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(249, 115, 22, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(249, 115, 22, 0.05) 1px, transparent 1px),
    linear-gradient(rgba(245, 158, 11, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 158, 11, 0.035) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 15%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 15%, transparent 75%);
}

html[data-theme="dark"] body::before {
  background-image:
    linear-gradient(rgba(251, 191, 36, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(251, 191, 36, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(249, 115, 22, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(249, 115, 22, 0.05) 1px, transparent 1px);
}

body.physics-platform::before { display: none; }

body::after { display: none; content: none; }

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0;
  color: var(--text-strong);
}

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

/* ─── Buttons ─── */
.btnx, .ui-btn, .hero__btn, .grade-cardx__btn, .cta-banner__btn {
  font-family: var(--font-body);
}

.btnx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s, border-color .2s, box-shadow .2s, transform .2s;
  white-space: nowrap;
}

.btnx.solid {
  background: var(--btn-solid-bg);
  color: var(--btn-solid-text);
  box-shadow: 0 2px 6px rgba(234, 88, 12, 0.28), 0 8px 20px rgba(251, 191, 36, 0.30);
}

.btnx.solid:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(249, 115, 22, 0.40);
}

.btnx.outline {
  background: var(--card-bg);
  color: var(--primary-strong);
  border-color: var(--border-strong);
}

.btnx.outline:hover {
  background: var(--primary-weak);
  border-color: var(--brand-400);
}

.ui-input, .ui-select, .input, .input2 {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--field-border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  background: var(--field-bg);
  color: var(--field-text);
  transition: border-color .2s, box-shadow .2s;
}

.ui-input:focus, .ui-select:focus, .input:focus, .input2:focus {
  outline: none;
  border-color: var(--brand-500);
  box-shadow: 0 0 0 3px var(--primary-weak);
}

.ui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.ui-btn--solid {
  background: var(--btn-solid-bg);
  color: var(--btn-solid-text);
  box-shadow: 0 6px 18px rgba(249, 115, 22, 0.28);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 20px;
}

.platform-logo__img--light { display: block; }
.platform-logo__img--dark { display: none; }
html[data-theme="dark"] .platform-logo__img--light { display: none; }
html[data-theme="dark"] .platform-logo__img--dark { display: block; }

body.student-lite { padding-top: 0; }