/* ==========================================================================
   1. CSS Variables and Theme Management
   ========================================================================== */
:root {
    --color-background: #000000; --color-surface-1: #121212; --color-surface-2: #1e1e1e;
    --color-text-primary: #ffffff; --color-text-muted: #888888;
    --color-accent: #ffd700; --color-accent-contrast: #000000;
    --color-glass-bg: rgba(255, 255, 255, 0.03); --color-glass-border: rgba(255, 255, 255, 0.1);
    --color-success: #00ff88; --color-error: #ff4444; --color-warning: #ffaa00;
    --color-success-bg: rgba(0, 255, 136, 0.1); --color-error-bg: rgba(255, 68, 68, 0.1);
    --color-warning-bg: rgba(255, 170, 0, 0.1); --color-status-free-bg: rgba(0, 255, 136, 0.8);
    --color-status-free-text: #000000; --color-status-premium-bg: rgba(255, 215, 0, 0.9);
    --color-status-premium-text: #000000; --color-status-locked-bg: rgba(255, 68, 68, 0.8);
    --color-status-locked-text: #ffffff; --border-radius-sm: 10px; --border-radius-md: 20px;
    --border-radius-lg: 30px; --shadow-accent: 0 10px 30px rgba(255, 215, 0, 0.1);
    --shadow-primary: 0 20px 40px rgba(0, 0, 0, 0.2); --transition-speed: 0.4s;
}
html[data-theme='light'] {
    --color-background: #f4f7fa; --color-surface-1: #ffffff; --color-surface-2: #eef2f7;
    --color-text-primary: #1a202c; --color-text-muted: #6b7280;
    --color-accent: #4f46e5; --color-accent-contrast: #ffffff;
    --color-glass-bg: rgba(79, 70, 229, 0.05); --color-glass-border: rgba(206, 212, 218, 0.7);
    --color-success: #16a34a; --color-error: #dc2626; --color-warning: #f97316;
    --color-success-bg: rgba(22, 163, 74, 0.1); --color-error-bg: rgba(220, 38, 38, 0.1);
    --color-warning-bg: rgba(249, 115, 22, 0.1); --color-status-free-bg: #16a34a;
    --color-status-free-text: #ffffff; --color-status-premium-bg: #4f46e5;
    --color-status-premium-text: #ffffff; --color-status-locked-bg: #ef4444;
    --color-status-locked-text: #ffffff; --shadow-accent: 0 10px 25px rgba(79, 70, 229, 0.15);
    --shadow-primary: 0 10px 20px rgba(0, 0, 0, 0.05);
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Cairo', 'Tajawal', sans-serif; }

html { scroll-behavior: smooth; }
body {
    background-color: var(--color-background);
    background-image: linear-gradient(135deg, var(--color-surface-1) 0%, var(--color-background) 50%, var(--color-surface-1) 100%);
    background-size: 400% 400%; animation: backgroundPan 15s ease infinite;
    min-height: 100vh; color: var(--color-text-primary); overflow-x: hidden;
    transition: color var(--transition-speed), background-color var(--transition-speed);
    font-size: 17px; /* Larger base font size */
    line-height: 1.8; /* Improved line height */
}
h1, h2, h3, h4, h5, h6, .logo {
    font-family: 'Tajawal', sans-serif; /* Keep Tajawal for headings and logo */
}
.main-content { padding-top: 90px; min-height: calc(100vh - 80px); }

/* ==========================================================================
   2. Navigation Bar & General Layout
   ========================================================================== */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(0, 0, 0, 0.8); backdrop-filter: blur(25px); border-bottom: 1px solid var(--color-glass-border); padding: 1.2rem 0; transition: all var(--transition-speed) ease; }
html[data-theme='light'] .navbar { background: rgba(255, 255, 255, 0.8); }

.container, .nav-container { 
    width: 100%;
    max-width: 1280px; 
    margin: 0 auto; 
    padding: 0 2rem;
}
.nav-container { 
    display: flex; 
    align-items: center; 
    position: relative;
    justify-content: center;
}
.logo { 
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex; align-items: center; gap: 0.7rem; font-size: 1.7rem; font-weight: 900; color: var(--color-accent); text-shadow: 0 0 10px var(--color-accent); text-decoration: none; 
}
.nav-links { 
    display: flex; gap: 1rem; list-style: none; 
}
.nav-links a { color: var(--color-text-primary); text-decoration: none; font-weight: 500; transition: all var(--transition-speed) ease; padding: 0.6rem 1.2rem; border-radius: 50px; }
.nav-links a:hover, .nav-links a.active { background: var(--color-accent); color: var(--color-accent-contrast); transform: translateY(-3px); box-shadow: var(--shadow-accent); }
.logout-btn { background: transparent; border: 2px solid var(--color-error); color: var(--color-error); padding: 0.6rem 1.2rem; border-radius: 50px; cursor: pointer; font-weight: 600; transition: all var(--transition-speed) ease; }
.logout-btn:hover { background: var(--color-error); color: white; transform: translateY(-3px); box-shadow: 0 5px 15px var(--color-error-bg); }

/* ==========================================================================
   3. Page Sections
   ========================================================================== */
.hero-section { 
    padding: 5rem 0;
    text-align: center; 
    overflow-x: hidden; 
}
html[data-theme='dark'] .hero-section { background: radial-gradient(circle at 50% 50%, rgba(255, 215, 0, 0.08) 0%, transparent 60%); }
html[data-theme='light'] .hero-section { background: radial-gradient(circle at 50% 50%, var(--color-glass-bg) 0%, transparent 60%); }
.hero-title { font-size: 4.5rem; font-weight: 900; margin-bottom: 1.5rem; background: linear-gradient(45deg, var(--color-text-primary), var(--color-accent), var(--color-text-primary)); background-size: 200% auto; -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; animation: textShine 5s linear infinite; }
.hero-subtitle { font-size: 1.6rem; color: var(--color-text-muted); margin-bottom: 3rem; max-width: 700px; margin-left: auto; margin-right: auto; line-height: 1.7; }
.cta-buttons { display: flex; gap: 1.5rem; justify-content: center; flex-wrap: wrap; }

.features-section, .courses-section, .how-it-works-section { padding: 5rem 0; }
.section-title { text-align: center; font-size: 3.5rem; font-weight: 900; margin-bottom: 3.5rem; color: var(--color-accent); }

.features-grid, .how-it-works-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2.5rem; }
.courses-grid {
    display: grid;
    /* Use a fixed width for columns and center the grid. This prevents a single item from stretching to full width. */
    grid-template-columns: repeat(auto-fit, 350px);
    gap: 2rem;
    justify-content: center;
}
.interactive-card {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-speed) ease;
    transform-style: preserve-3d;
    /* Add a subtle default shadow for an "elevated" look */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}
.interactive-card:hover {
    transform: translateY(-10px) scale(1.03); /* Refined hover effect */
    border-color: var(--color-accent);
    box-shadow: var(--shadow-primary);
}

.feature-card, .how-it-works-card { padding: 2.5rem; text-align: center; }
.feature-icon, .how-it-works-number { font-size: 3.5rem; margin-bottom: 1.5rem; color: var(--color-accent); font-weight: 900; }
.feature-title, .how-it-works-title { font-size: 1.7rem; font-weight: 700; margin-bottom: 1rem; color: var(--color-accent); }
.feature-description, .how-it-works-description { color: var(--color-text-muted); line-height: 1.8; }

.course-card {
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    background-color: var(--color-surface-1);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-speed) ease;
    border: 1px solid var(--color-glass-border);
    height: 100%; /* Fix: Ensure all cards in a row have the same height */
}
.course-card .aurora-effect { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--color-accent), transparent 40%); opacity: 0; transition: opacity var(--transition-speed) ease; pointer-events: none; }
html[data-theme='dark'] .course-card .aurora-effect { mix-blend-mode: soft-light; filter: brightness(0.7); }
html[data-theme='light'] .course-card .aurora-effect { mix-blend-mode: overlay; opacity: 0; filter: brightness(1.2); }
.course-card:hover .aurora-effect { opacity: 0.15; }
.course-header {
    padding: 1.75rem; /* Reduced padding */
    background: linear-gradient(145deg, var(--color-surface-1), var(--color-surface-2));
}
.course-icon { font-size: 3rem; margin-bottom: 1rem; text-shadow: 0 0 15px currentColor; }
.course-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--color-accent); min-height: 40px; } /* Give title a min-height */
.course-description { 
    color: var(--color-text-muted); 
    line-height: 1.6; 
    margin-bottom: 1.5rem; 
    flex-grow: 1; /* Allow description to grow */
}
.course-meta { display: flex; gap: 0.75rem; flex-wrap: wrap; } /* Removed margin-bottom */
.course-tag { background: var(--color-glass-bg); padding: 0.4rem 1rem; border-radius: 20px; font-size: 0.85rem; border: 1px solid var(--color-glass-border); font-weight: 500; }
.course-body {
    padding: 1.75rem; /* Reduced padding */
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.course-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.75rem; /* Reduced margin */
}
.stat-item { text-align: center; }
.stat-number { font-size: 1.4rem; font-weight: 700; color: var(--color-accent); }
.stat-label { font-size: 0.9rem; color: var(--color-text-muted); }
.course-status { position: absolute; top: 1.5rem; left: 1.5rem; padding: 0.6rem 1.2rem; border-radius: 50px; font-size: 0.9rem; font-weight: 700; backdrop-filter: blur(10px); }
.status-free { background-color: var(--color-status-free-bg); color: var(--color-status-free-text); }
.status-premium { background-color: var(--color-status-premium-bg); color: var(--color-status-premium-text); }
.status-locked { background-color: var(--color-status-locked-bg); color: var(--color-status-locked-text); }

.filter-container { margin: 0 auto 3rem auto; padding: 2rem; background: var(--color-glass-bg); border-radius: var(--border-radius-md); border: 1px solid var(--color-glass-border); display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: space-between; }
.filter-group { flex: 1; min-width: 200px; }
.filter-label { display: block; margin-bottom: 0.5rem; font-weight: 500; color: var(--color-text-muted); }
.search-input, .filter-select { width: 100%; padding: 0.8rem 1rem; background: var(--color-surface-2); border: 2px solid var(--color-glass-border); border-radius: var(--border-radius-sm); color: var(--color-text-primary); font-size: 1rem; transition: all var(--transition-speed) ease; }
.search-input:focus, .filter-select:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 4px var(--color-glass-bg); }
.filter-select {-webkit-appearance: none; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23888888' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: left 0.7rem center; padding-left: 2rem; cursor: pointer; }
html[data-theme='light'] .filter-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E"); }

/* ==========================================================================
   4. Forms, Buttons, and Messages
   ========================================================================== */
.btn { padding: 1.2rem 2.5rem; border: none; border-radius: 50px; font-size: 1.1rem; font-weight: 700; cursor: pointer; transition: all var(--transition-speed) cubic-bezier(0.25, 0.8, 0.25, 1); text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 0.7rem; text-transform: uppercase; letter-spacing: 1px; position: relative; overflow: hidden; }
.btn-primary { background: var(--color-accent); color: var(--color-accent-contrast); box-shadow: var(--shadow-primary); }
.btn-primary:hover { transform: translateY(-5px) scale(1.05); box-shadow: var(--shadow-accent); }
.btn-secondary { background: transparent; color: var(--color-text-primary); border: 2px solid var(--color-text-primary); }
.btn-secondary:hover { background: var(--color-text-primary); color: var(--color-background); transform: translateY(-5px); }
.btn-telegram { background: #0088cc; color: #ffffff; border: 2px solid #0088cc; }
.btn-telegram:hover { background: #006699; border-color: #006699; transform: translateY(-5px); }
.btn-login-prompt { background-color: var(--color-surface-2); color: var(--color-accent); border: 2px solid var(--color-accent); }
.btn-login-prompt:hover { background-color: var(--color-accent); color: var(--color-accent-contrast); transform: translateY(-5px); }

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.badge {
    padding: 0.4em 0.8em;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9em;
    color: #fff;
}

.badge-success {
    background-color: var(--color-success);
}

.badge-danger {
    background-color: var(--color-error);
}

.form-container { max-width: 550px; margin: 3rem auto; padding: 2rem 1rem; }
.form-card { padding: 3.5rem; position: relative; overflow: hidden; background-color: var(--color-surface-1); }
.form-header { text-align: center; margin-bottom: 2.5rem; }
.form-icon { width: 90px; height: 90px; background: var(--color-accent); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 1.5rem; font-size: 2.5rem; color: var(--color-accent-contrast); box-shadow: 0 0 25px var(--color-accent); }
.form-title { font-size: 2.2rem; font-weight: 700; margin-bottom: 0.7rem; color: var(--color-accent); }
.form-subtitle { color: var(--color-text-muted); line-height: 1.6; }
.form-group { margin-bottom: 2rem; position: relative; }
.form-label { display: block; margin-bottom: 0.7rem; font-weight: 600; }
.form-input { width: 100%; padding: 1.2rem; background: var(--color-glass-bg); border: 2px solid var(--color-glass-border); border-radius: var(--border-radius-sm); color: var(--color-text-primary); font-size: 1.1rem; transition: all var(--transition-speed) ease; }
.form-input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 4px var(--color-glass-bg); }
.form-input::placeholder { color: var(--color-text-muted); }

.message { padding: 1.2rem 1.8rem; border-radius: var(--border-radius-sm); margin-bottom: 2rem; font-weight: 600; font-size: 1.1rem; animation: fadeIn 0.6s ease-out; border-left: 5px solid; display: flex; align-items: center; gap: 1rem; }
.message.success { background: var(--color-success-bg); color: var(--color-success); border-color: var(--color-success); }
.message.error { background: var(--color-error-bg); color: var(--color-error); border-color: var(--color-error); }
.message.warning { background: var(--color-warning-bg); color: var(--color-warning); border-color: var(--color-warning); }

/* ==========================================================================
   5. Quiz and Results Interface
   ========================================================================== */
.quiz-container { max-width: 850px; margin: 3rem auto; padding: 0 1rem; }
.quiz-header { background: var(--color-glass-bg); border: 1px solid var(--color-glass-border); border-radius: var(--border-radius-md); padding: 2.5rem; margin-bottom: 2.5rem; text-align: center; }
.quiz-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1rem; /* أضف مسافة بين العنوان والمؤقت */
}
.quiz-header-top h2 {
    flex-grow: 1; /* اسمح للعنوان بأخذ المساحة المتاحة */
    text-align: right; /* محاذاة النص لليمين */
}
.quiz-timer {
    display: flex;
    align-items: center;
    justify-content: center; /* Center content */
    gap: 0.75rem;
    font-size: 2.5rem; /* تكبير حجم الخط */
    font-weight: 900; /* خط أعرض */
    color: var(--color-accent); /* لون مميز */
    background-color: var(--color-glass-bg); /* خلفية زجاجية */
    min-width: 120px; /* تحديد عرض أدنى */
    padding: 0.8rem 1.5rem; /* زيادة الحشوة */
    border-radius: var(--border-radius-md); /* حواف متناسقة */
    border: 2px solid var(--color-accent); /* إطار مميز */
    text-shadow: 0 0 10px var(--color-accent); /* ظل للنص */
    box-shadow: var(--shadow-accent); /* ظل للعنصر */
    transition: all 0.3s ease;
}
.quiz-timer::before {
    content: '⏱️';
    font-size: 2rem; /* تكبير الأيقونة */
    filter: drop-shadow(0 0 5px var(--color-accent));
}
.quiz-timer.warning {
    color: var(--color-warning);
    box-shadow: 0 0 10px var(--color-warning-bg);
}
.quiz-timer.danger {
    color: var(--color-error);
    box-shadow: 0 0 10px var(--color-error-bg);
    animation: pulse 0.5s infinite alternate;
}
.quiz-progress { width: 100%; height: 12px; background: var(--color-surface-2); border-radius: 10px; margin: 1.5rem 0 0; overflow: hidden; position: relative; }
.quiz-progress-bar { height: 100%; background: linear-gradient(90deg, var(--color-accent), color-mix(in srgb, var(--color-accent) 80%, white)); border-radius: 10px; transition: width 0.5s ease-out; position: relative; }
.quiz-progress-bar::after { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%); animation: shimmer 2s infinite; }
.question-card {
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: stretch; /* Change to stretch to allow options grid to expand */
}
.question-text-container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto 1.5rem auto;
    padding: 1.5rem 2rem;
    background-color: var(--color-surface-2);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-glass-border);
    box-shadow: var(--shadow-primary);
}
.question-text {
    font-size: 1.4rem; /* Larger question text */
    font-weight: 500;
    line-height: 1.7;
    text-align: right;
}
.question-image-container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto 2.5rem auto;
    position: relative;
    aspect-ratio: 16 / 9;
    background-color: var(--color-surface-2);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--color-glass-border);
    box-shadow: var(--shadow-primary);
}
.fullscreen-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 11;
    transition: background-color 0.3s;
}
.fullscreen-btn:hover {
    background-color: rgba(0, 0, 0, 0.8);
}
.fullscreen-btn svg {
    width: 20px;
    height: 20px;
}
.question-image {
    width: 100%;
    height: 100%; /* اجعل الصورة تملأ الحاوية */
    display: block;
    background-size: contain; /* عرض الصورة كاملة دون قص */
    background-position: center; /* توسط الصورة */
    background-repeat: no-repeat; /* عدم تكرار الصورة */
}
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Use 2 columns for wider screens */
    gap: 1.5rem;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}
.option-btn {
    width: 100%;
    padding: 1.5rem;
    background: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    text-align: right;
    font-size: 1.1rem;
    backdrop-filter: blur(10px);
}
.option-btn:hover {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    transform: translateY(-5px);
    box-shadow: var(--shadow-accent);
}
.option-btn.selected {
    background: var(--color-accent);
    color: var(--color-accent-contrast);
    border-color: var(--color-accent);
}

.option-btn.correct {
    background: var(--color-success-bg);
    color: var(--color-success);
    border-color: var(--color-success);
}

.option-btn.incorrect {
    background: var(--color-error-bg);
    color: var(--color-error);
    border-color: var(--color-error);
}

.quiz-body {
    display: flex;
    gap: 2.5rem;
    align-items: flex-start;
}

.quiz-main {
    flex: 3;
}

.quiz-sidebar {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 100px;
}

.calculator-container {
    background: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-primary);
}

.calculator-display {
    background: var(--color-surface-2);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    text-align: right;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    overflow-x: auto;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.calc-btn {
    padding: 1.2rem;
    font-size: 1.2rem;
    font-weight: 700;
    border: none;
    border-radius: var(--border-radius-sm);
    background: var(--color-surface-2);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background 0.2s;
}

.calc-btn:hover {
    background: var(--color-surface-1);
}

.calc-btn.op {
    background: var(--color-accent);
    color: var(--color-accent-contrast);
}

.calc-btn.wide {
    grid-column: span 2;
}

.result-container { max-width: 650px; margin: 3rem auto; padding: 0 1rem; text-align: center; }
.result-card { background: var(--color-glass-bg); border: 1px solid var(--color-accent); border-radius: var(--border-radius-lg); padding: 4rem; box-shadow: 0 0 50px var(--shadow-accent); }
.result-score { font-size: 5rem; font-weight: 900; color: var(--color-accent); margin-bottom: 1.5rem; }
.result-text { font-size: 1.4rem; color: var(--color-text-muted); margin-bottom: 3rem; }

.quiz-review-container { max-width: 900px; margin: 3rem auto; padding: 0 1rem; }
.review-question-card { background: var(--color-glass-bg); border: 1px solid var(--color-glass-border); border-radius: var(--border-radius-md); margin-bottom: 2rem; padding: 1.5rem; }
/* إلغاء تنسيق الصندوق الداخلي لنص السؤال في صفحة المراجعة لتجنب التنسيق المزدوج */
.review-question-card .question-text-container {
    padding: 0;
    margin: 0 0 1.5rem 0;
    background-color: transparent;
    border: none;
    box-shadow: none;
}
.review-question-card .question-text { font-size: 1.5rem; margin-bottom: 0; }
/* --- Quiz Review Button Styles --- */
.quiz-review-container .option-btn {
    cursor: default;
}
.quiz-review-container .option-btn:hover {
    transform: none;
    box-shadow: none;
    background: var(--color-glass-bg);
    color: var(--color-text-primary);
    border-color: var(--color-glass-border);
}
.quiz-review-container .option-btn.correct-answer,
.quiz-review-container .option-btn.correct-answer:hover {
    background: var(--color-success-bg) !important;
    border-color: var(--color-success) !important;
    color: var(--color-success) !important;
}
.quiz-review-container .option-btn.user-answer.wrong-answer,
.quiz-review-container .option-btn.user-answer.wrong-answer:hover {
    background: var(--color-error-bg) !important;
    border-color: var(--color-error) !important;
    color: var(--color-error) !important;
}
.explanation-box { margin-top: 1.5rem; padding: 1.5rem; background: var(--color-surface-2); border-radius: var(--border-radius-sm); border-left: 4px solid var(--color-accent); }

.watermark {
    position: absolute;
    top: 15px;
    left: 15px;
    background-color: rgba(0, 0, 0, 0.6);
    color: rgba(255, 255, 255, 0.75);
    padding: 5px 10px;
    font-size: 14px;
    border-radius: 7px;
    pointer-events: none;
    z-index: 10;
    font-family: monospace;
    backdrop-filter: blur(2px);
}

/* Sizing for review page images */
.review-image-container {
    aspect-ratio: auto; /* Remove fixed aspect ratio */
    height: auto;       /* Allow height to be flexible */
}
.review-image-container .question-image {
    min-height: 400px;  /* Ensure enough space for tall images */
    width: 100%;
}

/* ==========================================================================
   6. User Profile Page
   ========================================================================== */
.profile-container { max-width: 900px; margin: 3rem auto; padding: 0 1rem; }
.profile-card { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 3rem; margin-bottom: 3rem; background-color: var(--color-surface-1); }
.profile-avatar { font-size: 4rem; width: 120px; height: 120px; border-radius: 50%; background: var(--color-surface-2); display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem; border: 3px solid var(--color-accent); }
.profile-name { font-size: 2.2rem; font-weight: 700; color: var(--color-accent); }
.profile-email { font-size: 1.1rem; color: var(--color-text-muted); margin-top: 0.5rem; }
.profile-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; width: 100%; margin: 3rem 0; }
.profile-stat-item { padding: 2rem; background: var(--color-glass-bg); border-radius: var(--border-radius-md); border: 1px solid var(--color-glass-border); }
.stat-value { font-size: 2.5rem; font-weight: 900; color: var(--color-accent); }
.stat-title { font-size: 1rem; color: var(--color-text-muted); margin-top: 0.5rem; }
.activity-history h3 { font-size: 1.8rem; text-align: center; margin-bottom: 2rem; color: var(--color-accent); }
.activity-table { width: 100%; border-collapse: collapse; }
.activity-table th, .activity-table td { padding: 1.2rem; text-align: right; border-bottom: 1px solid var(--color-glass-border); }
.activity-table th { font-weight: 700; color: var(--color-text-muted); }
.activity-table tr:last-child td { border-bottom: none; }
.activity-table tr:hover { background: var(--color-glass-bg); }

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-primary);
}

.course-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    pointer-events: auto !important;
}

.course-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}



/* ==========================================================================
   7. Footer and Utilities
   ========================================================================== */
.site-footer {
    background: var(--color-surface-1);
    padding: 3rem 2rem;
    margin-top: 4rem;
    border-top: 1px solid var(--color-glass-border);
    text-align: center;
    position: relative; /* Needed for containing elements if any are absolute */
    padding-bottom: 80px; /* Add padding to the bottom to make space for floating buttons */
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: scale(1.1); filter: brightness(1.1); }

.loading { display: inline-block; width: 22px; height: 22px; border: 3px solid rgba(255, 255, 255, 0.3); border-radius: 50%; border-top-color: var(--color-accent); animation: spin 1s ease-in-out infinite; }
.empty-state { text-align: center; padding: 4rem; background: var(--color-glass-bg); border-radius: var(--border-radius-md); border: 1px dashed var(--color-glass-border); }
.empty-state-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }
.empty-state-text { color: var(--color-text-muted); font-size: 1.2rem; }

/* ==========================================================================
   8. Responsive Design
   ========================================================================== */
.nav-toggle { 
    display: none; background: transparent; border: none; cursor: pointer; padding: 0.5rem; z-index: 1001;
    position: absolute; 
    left: 2rem;
    top: 50%; 
    transform: translateY(-50%);
}
.nav-toggle .bar { display: block; width: 28px; height: 3px; margin: 6px auto; background-color: var(--color-text-primary); border-radius: 3px; transition: all var(--transition-speed) ease-in-out; }
.nav-toggle.open .bar:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.nav-toggle.open .bar:nth-child(2) { opacity: 0; }
.nav-toggle.open .bar:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

@media (max-width: 992px) {
    .nav-toggle { display: block; }
    .nav-links { 
        position: fixed; top: 80px; right: 0; left: 0; flex-direction: column; 
        background: var(--color-background); backdrop-filter: blur(20px); 
        padding: 2rem 0; transform: translateY(-120%); 
        transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1); 
        border-top: 1px solid var(--color-glass-border); height: calc(100vh - 80px); 
        overflow-y: auto; 
    }
    html[data-theme='dark'] .nav-links { background: rgba(10, 10, 10, 0.98); }
    .nav-links.active { transform: translateY(0); }
    .nav-links li { text-align: center; width: 100%; }
    .nav-links a { display: block; padding: 1.5rem; font-size: 1.2rem; }
}

@media (max-width: 768px) {
    .options-grid {
        grid-template-columns: 1fr; /* Switch to a single column on smaller screens */
    }
    .logo { font-size: 1.4rem; }
    .hero-title { font-size: 2.8rem; }
    .hero-subtitle { font-size: 1.3rem; }
    .section-title { font-size: 2.5rem; }
    .courses-section { padding: 3rem 0; }
    .cta-buttons { flex-direction: column; align-items: stretch; }
    .form-card, .question-card, .result-card, .profile-card { padding: 2.5rem 1.5rem; }
    .courses-grid { grid-template-columns: 1fr; }
    .course-card:hover { transform: translateY(-8px); }
    .question-text { font-size: 1.4rem; }
    .option-btn { padding: 1.5rem; font-size: 1.1rem; }
    .option-btn:hover { transform: translateX(0); background: var(--color-glass-bg); }
    .profile-stats { grid-template-columns: 1fr; }
    .activity-table th, .activity-table td { padding: 1rem 0.5rem; font-size: 0.9rem; }
    .filter-container { flex-direction: column; }
    .back-to-top { bottom: 20px; left: 20px; width: 45px; height: 45px; font-size: 1.2rem;}
}

/* ==========================================================================
   9. Animations
   ========================================================================== */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-15px); } to { opacity: 1; transform: translateY(0); } }
@keyframes backgroundPan { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
@keyframes textShine { 0% { background-position: 200% center; } 100% { background-position: -200% center; } }
@keyframes shimmer { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
@keyframes pulse {
    from { transform: scale(1); box-shadow: 0 0 10px var(--color-error-bg); }
    to { transform: scale(1.1); box-shadow: 0 0 20px var(--color-error); }
}
.reveal-on-scroll { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease-out, transform 0.8s ease-out; }
.reveal-on-scroll.revealed { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   10. Security Overlay
   ========================================================================== */
#dev-tools-warning {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.warning-content {
    max-width: 500px;
    padding: 2rem;
}

.warning-content h1 {
    font-size: 2.5rem;
    color: var(--color-error);
    margin-bottom: 1rem;
}

.warning-content p {
    font-size: 1.2rem;
    color: var(--color-text-muted);
}

/* Prevent image dragging */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

/* --- Fullscreen Modal --- */
.fullscreen-modal {
    display: none;
    position: fixed;
    z-index: 9998;
    padding-top: 20px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.5s;
}
.fullscreen-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90%;
    pointer-events: auto; /* Allow dragging/saving of the fullscreen image */
}
.close-fullscreen {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 9999;
}
.close-fullscreen:hover,
.close-fullscreen:focus {
    color: #bbb;
    text-decoration: none;
}