/**
 * Fitness Coach Pro - Core Design System & Tokens
 * Contains CSS Tokens, Variables, Base Canvas, Glass Cards & Global Utilities
 */

/* ─────────────────────────────────────────────
     Theme Token Variables
     ───────────────────────────────────────────── */
:root {
    /* Fonts */
    --font-en: 'Outfit', sans-serif;
    --font-ar: 'Cairo', 'Tajawal', sans-serif;

    /* Premium Minimal Business Light Theme */
    --bg-color: var(--bg);
    --card-bg: var(--surface);
    --card-border: var(--border-subtle);
    --border-stroke: var(--border-faint);
    --text-primary: var(--text);
    --text-secondary: var(--text-muted);
    --text-muted: var(--text-subtle);
    
    /* Elegant Business Accents */
    --accent-green: var(--gold); /* Teal-700 */
    --accent-green-shadow: var(--gold-dark);
    --accent-green-glow: var(--gold-glow);
    --accent-blue: var(--gold); /* Blue-700 */
    --accent-blue-shadow: var(--gold-dark);
    --accent-blue-glow: var(--gold-glow);
    --accent-orange: var(--gold); /* Rose-700 (Very premium brand feel) */
    --accent-orange-shadow: var(--gold-dark);
    --accent-yellow: var(--gold); /* Amber-700 */
    --accent-yellow-shadow: var(--gold-dark);
    --accent-red: var(--gold);
    --accent-red-shadow: var(--gold-dark);
    --accent-purple: var(--gold);
    --accent-purple-glow: var(--gold-glow);

    /* Premium Clean Shadow */
    --box-shadow: 0 1px 3px rgba(0, 0, 0,0.06), 0 12px 32px -4px rgba(0, 0, 0,0.08);
    --glass-blur: none; /* Crisp layout in Business Mode */
    --card-glow: none;

    /* Spacing & Business Radii */
    --section-gap: 80px;
    --card-radius: 12px; /* Sleek business radius */
    --btn-radius: 8px; /* Professional button radius */

    /* Default */
    --font-family: var(--font-en);

    /* Distinct Muscle Radar Variables for Light Mode */
    --radar-bg: #4f46e5; /* Indigo-600 */
    --radar-glow: rgba(79, 70, 229, 0.35);
    --radar-icon-color: #ffffff;
}

/* Dark Theme overrides (Cyberpunk Glassmorphism) */
body.dark-theme,
html.dark-theme {
    --bg-color: #030712;
    --card-bg: rgba(0, 0, 0, 0.7);
    --card-border: rgba(255, 255, 255, 0.06);
    --border-stroke: rgba(255, 255, 255, 0.06);
    --text-primary: var(--surface-raised);
    --text-secondary: var(--text-subtle);
    --text-muted: var(--text-subtle);

    --accent-green: #C5A059;
    --accent-green-shadow: var(--gold-dark);
    --accent-green-glow: var(--gold-glow);
    --accent-blue: var(--gold);
    --accent-blue-shadow: var(--gold-dark);
    --accent-blue-glow: var(--gold-glow);
    --accent-orange: #f97316;
    --accent-orange-shadow: var(--gold-dark);
    --accent-yellow: #eab308;
    --accent-yellow-shadow: var(--gold-dark);
    --accent-red: #ef4444;
    --accent-red-shadow: var(--gold-dark);

    --box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255,255,255,0.03);
    --glass-blur: blur(20px) saturate(200%);
    --card-glow: 0 0 0 1px rgba(255,255,255,0.1);
    --card-radius: 24px;
    --btn-radius: 14px;

    /* Distinct Muscle Radar Variables for Dark Mode */
    --radar-bg: #f97316; /* Cyberpunk Orange */
    --radar-glow: rgba(249, 115, 22, 0.45);
    --radar-icon-color: #ffffff;
}

/* RTL Layout Font Override */
body.rtl-layout {
    --font-family: var(--font-ar);
    direction: rtl;
}

/* Force form elements and placeholders to inherit/use Cairo in RTL */
body.rtl-layout input,
body.rtl-layout textarea,
body.rtl-layout select,
body.rtl-layout button,
body.rtl-layout select option,
body.rtl-layout ::placeholder {
    font-family: 'Cairo', var(--font-ar) !important;
}

/* ─────────────────────────────────────────────
     Base & Canvas Layout
     ───────────────────────────────────────────── */
html {
    background-color: var(--bg-color);
    transition: background-color 0.4s ease;
    scroll-behavior: smooth;
}

body {
    background-color: transparent !important;
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
}

/* WebGL canvas background */
.nerve-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ─────────────────────────────────────────────
     Reusable UI Components: Glass Cards & Utilities
     ───────────────────────────────────────────── */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: var(--card-radius);
    box-shadow: var(--box-shadow);
    padding: 28px;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
                border-color 0.3s ease,
                box-shadow 0.4s ease;
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    z-index: 1;
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: var(--box-shadow), 0 0 30px rgba(34, 197, 94, 0.05);
    transform: translateY(-2px);
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.08);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

body.dark-theme .social-link {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.08);
}

.social-link:hover {
    color: #C5A059;
    border-color: #C5A059;
    background: rgba(197, 160, 89, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(197, 160, 89, 0.15);
}

.footer-accessibility {
    display: flex;
    gap: 12px;
}

.footer-tool-btn {
    font-size: 0.8rem;
    padding: 8px 16px;
    border-radius: 10px;
}

.footer-tool-btn .battery-off-icon { display: none; }
.footer-tool-btn.active .battery-off-icon { display: block; }
.footer-tool-btn.active .battery-on-icon { display: none; }

.footer-tool-btn .volume-off-icon { display: none; }
.footer-tool-btn.muted .volume-off-icon { display: block; }
.footer-tool-btn.muted .volume-on-icon { display: none; }

/* General Animations */
.hover-scale {
    transition: transform 0.2s ease;
}
.hover-scale:hover {
    transform: scale(1.03);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.animate-pulse {
    animation: pulse 2s infinite ease-in-out;
}

/* Premium text selection */
::selection {
    background: var(--gold);
    color: #ffffff;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--gold), var(--gold-dark));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--gold-dark), var(--gold));
}

/* Loading skeleton shimmer for AJAX content */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.skeleton-loading {
    background: linear-gradient(90deg, var(--card-bg) 25%, rgba(255,255,255,0.1) 50%, var(--card-bg) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Skeleton Screens for Loading States */
.skeleton-loader {
    background: linear-gradient(90deg, rgba(255,255,255,0.05) 25%, rgba(255,255,255,0.12) 37%, rgba(255,255,255,0.05) 63%);
    background-size: 400% 100%;
    animation: skeleton-glow 1.4s ease infinite;
    border-radius: 12px;
    height: 18px;
    margin-bottom: 12px;
}
.skeleton-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px auto;
}
.skeleton-card {
    padding: 24px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
}
@keyframes skeleton-glow {
    0% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* FOUC (Flash of untranslated content) prevention */
body:not(.rtl-layout) .lang-ar {
    display: none !important;
}
body.rtl-layout .lang-en {
    display: none !important;
}
body.rtl-layout .lang-ar {
    display: inline-block !important;
}

/* Material Symbols Default Settings */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
    color: var(--accent-gold) !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem; /* ~18px */
}