:root {
    --primary: #1a5fb4;
    --secondary: #00b4d8;
    --accent: #0077b6;
    --light: #f8f9fa;
    --dark: #343a40; 
    --nav-bg: #1a5fb4;
    --search-bg: #f0f8ff;
    --text-color: #212529;
    --background-color: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    --card-background: #ffffff;
    --card-shadow: 0 5px 15px rgba(0, 0, 0, .05);
    --border-color: #dee2e6;
}

[data-theme="dark"] {
    --primary: #4dabf7;
    --secondary: #3bc9db;
    --accent: #5c7cfa;
    --light: #2c2f33; 
    --dark: #f8f9fa; 
    --nav-bg: #23272a;
    --search-bg: #2c2f33;
    --text-color: #f8f9fa;
    --background-color: linear-gradient(135deg, #121212 0%, #1e1e1e 100%);
    --card-background: #2c2f33;
    --card-shadow: 0 5px 20px rgba(0, 0, 0, .3);
    --border-color: #495057;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI'; }
body { background: var(--background-color); min-height: 100vh; color: var(--text-color); }

/* Screen Layouts */
#login-screen { display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 100vh; background: linear-gradient(45deg, #00b4d8 0%, #0077b6 100%); color: #fff; text-align: center; }
/* جدار الفصل (الخلفية وراء السبورة) */
#quran-screen { 
    display: flex; position: fixed; inset: 0; 
    background: radial-gradient(circle at center, #334155 0%, #0f172a 100%); 
    z-index: 2000; justify-content: center; align-items: center; overflow: hidden; 
}

/* ========================================= */
/* تصميم السبورة والإطار الخشبي */
/* ========================================= */
.board-frame {
    background: #5d3a1a; /* لون خشب داكن */
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.6), 
                inset 0 0 10px rgba(0,0,0,0.8);
    border: 2px solid #3e2611;
    /* تأثير خطوط الخشب البسيطة */
    background-image: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(0,0,0,0.1) 10px, rgba(0,0,0,0.1) 20px);
    
    /* حركة دخول السبورة */
    animation: boardDrop 1s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    transform: translateY(-50px);
    opacity: 0;
}

.chalkboard {
    background: #1b3a2a; /* أخضر سبورة كلاسيكي */
    padding: 60px 80px;
    border-radius: 6px;
    box-shadow: inset 0 0 30px rgba(0,0,0,0.9);
    position: relative;
    overflow: hidden;
    /* تأثير غبار الطباشير الخفيف */
    background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 3px 3px;
}
  
.splash-scene {
    display: flex; flex-direction: column; align-items: center; justify-content: center; 
    position: relative; font-family: 'Cairo', sans-serif;
}
  
.splash-logo-container {
    display: flex; align-items: center; position: relative;
    width: 280px; 
    justify-content: flex-start;
}
  
/* النص: يبدو كطباشير ثم يشع كنور ذكي */
.splash-title {
    font-size: 3.8rem; font-weight: bold; margin: 0;
    background: linear-gradient(to left, #f8fafc 20%, #38bdf8 80%);
    -webkit-background-clip: text;
    color: transparent;
    /* ظل يحاكي الطباشير والنور معاً */
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.3), 0 0 30px rgba(56, 189, 248, 0.5);
    
    clip-path: inset(0 0 0 100%); 
    animation: splashTitleReveal 1.2s cubic-bezier(0.4, 0, 0.2, 1) 1s forwards;
}

/* القلم (مائل للون الطباشير المضيء) */
.splash-pen {
    font-size: 2.2rem; color: #e0f2fe;
    position: absolute; right: -30px; top: 15px;
    z-index: 10;
    opacity: 0;
    filter: drop-shadow(0 0 10px #38bdf8);
    animation: splashPenWriteTitle 1.2s cubic-bezier(0.4, 0, 0.2, 1) 1s forwards,
               splashPenWriteSubtitle 1.2s cubic-bezier(0.4, 0, 0.2, 1) 2.3s forwards;
}
  
.splash-subtitle {
    font-size: 1.5rem; color: #e2e8f0; margin-top: 15px; 
    font-family: 'Tajawal', sans-serif;
    letter-spacing: 1px;
    clip-path: inset(0 0 0 100%); 
    width: max-content;
    /* ظل خفيف للطباشير */
    text-shadow: 0 0 5px rgba(255,255,255,0.2);
    animation: splashTitleReveal 1.2s cubic-bezier(0.4, 0, 0.2, 1) 2.3s forwards;
}
  
/* التوهج الخلفي يعطي إحساس السحر الرقمي داخل السبورة */
.splash-glow {
    position: absolute; width: 300px; height: 300px; background: #38bdf8;
    border-radius: 50%; filter: blur(90px); opacity: 0; z-index: 0;
    animation: splashGlowPulse 4s ease-in-out 1s forwards;
}

/* ========================================= */
/* الحركات */
/* ========================================= */

/* حركة نزول السبورة من الأعلى بمرونة (Bounce) */
@keyframes boardDrop {
    0% { opacity: 0; transform: translateY(-50px) scale(0.95); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes splashTitleReveal {
    0% { clip-path: inset(0 0 0 100%); }
    100% { clip-path: inset(0 0 0 0); }
}

@keyframes splashPenWriteTitle {
    0% { opacity: 0; transform: translateX(0) translateY(-10px) rotate(-40deg); }
    10% { opacity: 1; transform: translateX(-20px) translateY(5px) rotate(-20deg); }
    25% { transform: translateX(-70px) translateY(-5px) rotate(-35deg); }
    50% { transform: translateX(-140px) translateY(8px) rotate(-15deg); }
    75% { transform: translateX(-210px) translateY(-2px) rotate(-30deg); }
    90% { opacity: 1; transform: translateX(-260px) translateY(5px) rotate(-20deg); }
    100% { opacity: 0; transform: translateX(-280px) translateY(-10px) rotate(-40deg); }
}

@keyframes splashPenWriteSubtitle {
    0% { opacity: 0; transform: translateX(20px) translateY(70px) rotate(-40deg); }
    10% { opacity: 1; transform: translateX(0px) translateY(85px) rotate(-20deg); }
    25% { transform: translateX(-70px) translateY(75px) rotate(-35deg); }
    50% { transform: translateX(-160px) translateY(88px) rotate(-15deg); }
    75% { transform: translateX(-240px) translateY(78px) rotate(-30deg); }
    90% { opacity: 1; transform: translateX(-310px) translateY(85px) rotate(-20deg); }
    100% { opacity: 0; transform: translateX(-330px) translateY(70px) rotate(0deg); }
}
  
@keyframes splashGlowPulse {
    0% { opacity: 0; transform: scale(0.3); }
    40% { opacity: 0.2; transform: scale(1.1); }
    70% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 0.2; transform: scale(1.05); }
}

/* تجاوب الشاشات الصغيرة */
@media (max-width: 500px) {
    .chalkboard { padding: 40px 30px; }
    .splash-title { font-size: 2.8rem; }
    .splash-subtitle { font-size: 1.1rem; }
    .splash-logo-container { width: 210px; }
    
    @keyframes splashPenWriteTitle {
        0% { opacity: 0; transform: translateX(0) translateY(-10px) rotate(-40deg); }
        100% { opacity: 0; transform: translateX(-210px) translateY(-10px) rotate(-40deg); }
    }
    @keyframes splashPenWriteSubtitle {
        0% { opacity: 0; transform: translateX(10px) translateY(50px) rotate(-40deg); }
        100% { opacity: 0; transform: translateX(-230px) translateY(50px) rotate(0deg); }
    }
}

#main-screen { display: none; }

/* Top Navigation */
.top-navbar { background: var(--nav-bg); padding: 0 20px; box-shadow: 0 2px 10px rgba(0, 0, 0, .1); position: sticky; top: 0; z-index: 1000; }
.top-nav-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 10px 0; }
.nav-links { display: flex; gap: 25px; align-items: center; }
.nav-link { color: #fff; text-decoration: none; font-size: 1rem; font-weight: 500; transition: all .3s; padding: 8px 15px; border-radius: 20px; }
.nav-link:hover { background: rgba(255, 255, 255, .2); }
.nav-logo { font-weight: 700; color: #fff; font-size: 1.4rem; display: flex; align-items: center; gap: 10px; }
.nav-logo i { color: var(--secondary); }

/* Search Bar */
.search-bar { background: var(--search-bg); padding: 15px 20px; box-shadow: 0 2px 5px rgba(0, 0, 0, .05); position: sticky; top: 60px; z-index: 999; }
.search-container { max-width: 1200px; margin: 0 auto; display: flex; gap: 15px; }

/* Main Content Area */
.main-container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; padding: 15px; border-radius: 15px; background: var(--card-background); box-shadow: var(--card-shadow); color: var(--text-color); }
.welcome-text { font-size: 1.5rem; font-weight: 700; color: var(--text-color); }
.welcome-text span { color: var(--primary); }
.user-actions { display: flex; gap: 15px; align-items: center; }

/* Dashboard */
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }