:root {
    /* الوضع النهاري الزجاجي */
    --main-bg-glass: linear-gradient(135deg, rgba(255,255,255,0.63) 65%, rgba(238,245,255,0.54) 100%);
    --main-blur: 18px;
    --main-bg-gradient: linear-gradient(135deg, #f7fafd 0%, #e3eaf6 100%);
    --glass-border: 1.2px solid rgba(255,255,255,0.32);
    --main-radius: 22px;
    --main-shadow: 0 8px 36px 0 rgba(74, 92, 124, 0.09);
    --main-shadow-hover: 0 16px 50px 0 rgba(74, 92, 124, 0.16);

    --primary: #12161a;   /* أزرق زجاجي فاتح */
    --accent: #31495f;    /* Mint زجاجي فاتح */
    --text-main: #223046;
    --text-light: #ffffff;
    --font-main: 'Tajawal', 'Segoe UI', Arial, sans-serif;
    --transition-main: 0.23s cubic-bezier(.57,.12,.38,1.04);
}

/* ===== الوضع الليلي الزجاجي العصري الغامق جداً ===== */
:root[data-theme='dark'] {
    --main-bg-glass: linear-gradient(135deg, rgba(18,22,34,0.93) 70%, rgba(34,41,58,0.83) 100%);
    --main-blur: 18px;
    --main-bg-gradient: linear-gradient(135deg, #171c28 0%, #22293a 100%);
    --glass-border: 1.3px solid rgba(90,120,175,0.18);
    --main-radius: 22px;
    --main-shadow: 0 8px 36px 0 rgba(14,18,31, 0.38);
    --main-shadow-hover: 0 16px 50px 0 rgba(16,24,39, 0.39);

    --primary: #51b9fe;   /* أزرق كهربائي للتفاعل فقط */
    --accent: #1a3146;    /* Mint كهربائي */
    --text-main: #e7effc; /* نص شبه أبيض مزرق */
    --text-light: #e7f8ff;
    --font-main: 'Tajawal', 'Segoe UI', Arial, sans-serif;
    --transition-main: 0.23s cubic-bezier(.57,.12,.38,1.04);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    min-height: 100vh;
    background: var(--main-bg-gradient) fixed;
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.7;
    direction: rtl;
    -webkit-font-smoothing: antialiased;
    font-size: 1.08rem;
    padding-right: 70px !important;
    transition: background 0.31s, color 0.25s, padding-right var(--transition-main);
}

/* Glassmorphism لأي عنصر */
.bg-glass,
.card-glass,
.container-glass {
    background: var(--main-bg-glass);
    border-radius: var(--main-radius);
    box-shadow: var(--main-shadow);
    backdrop-filter: blur(var(--main-blur)) saturate(170%);
    -webkit-backdrop-filter: blur(var(--main-blur)) saturate(170%);
    border: var(--glass-border);
    border-bottom: 2px solid rgba(180,200,230,0.16);
}

/* الروابط */
a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-main);
}
a:hover {
    color: var(--accent);
}

/* العناوين */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-main);
    font-weight: 800;
    color: var(--text-main);
    text-shadow: 0 2px 6px #eaf1fa36;
    margin-bottom: 0.7em;
    letter-spacing: .5px;
}
h1 { font-size: 2.32rem; }
h2 { font-size: 2.05rem; }
h3 { font-size: 1.45rem; }
h4, h5 { font-size: 1.09rem; }
p, li {
    color: #435064;
    margin-bottom: .85em;
}
:root[data-theme='dark'] p,
:root[data-theme='dark'] li {
    color: #b9c9e7;
}

/* القوائم */
ul, ol { margin-bottom: 1.6em; }
ul { padding-right: 1.5em; }
li { line-height: 1.8; }

/* الحاويات العامة */
.container {
    width: 100%;
    max-width: 2000px;
    margin: 0 auto;
    padding: 0 22px;
}

/* Glassmorphism Cards (إضافي) */
.card-glass {
    padding: 2.3rem 2.1rem;
    margin-bottom: 2.2rem;
    border-radius: var(--main-radius);
    border: var(--glass-border);
    box-shadow: var(--main-shadow);
    background: var(--main-bg-glass);
    backdrop-filter: blur(var(--main-blur)) saturate(170%);
    -webkit-backdrop-filter: blur(var(--main-blur)) saturate(170%);
}

/* الحواف */
.radius-xl { border-radius: 34px !important; }
.radius-lg { border-radius: 22px !important; }
.radius { border-radius: 14px !important; }
.radius-sm { border-radius: 7px !important; }

/* ظلال */
.shadow-main { box-shadow: var(--main-shadow); }
.shadow-hover:hover { box-shadow: var(--main-shadow-hover); }

/* Scrollbar */
::-webkit-scrollbar {
    width: 9px; background: #eceff7;
}
::-webkit-scrollbar-thumb {
    background: #dde5f6; border-radius: 9px;
}
::-webkit-scrollbar-thumb:hover {
    background: #bdd6ff;
}
:root[data-theme='dark'] ::-webkit-scrollbar {
    background: #232a3d;
}
:root[data-theme='dark'] ::-webkit-scrollbar-thumb {
    background: #353b56;
}
:root[data-theme='dark'] ::-webkit-scrollbar-thumb:hover {
    background: #254770;
}

/* Responsive أساسيات */
@media (max-width: 900px) {
    body { font-size: 0.98rem; padding-right: 49px !important; }
    .container { padding: 0 7px; }
    .card-glass { padding: 1.2rem 0.7rem; }
}

@media (max-width: 700px) {
    body { font-size: 0.93rem; padding-right: 0 !important; }
    .container { width: 100%; }
}