/* ================================================
   StudyMate - Global Variables
   متوافقة تماماً مع لوحة التحكم (user-profile.php v4.0)
   ================================================ */
:root {
    /* ✅ ألوان لوحة التحكم الأساسية (متطابقة) */
    --primary-gradient-start: #667eea;
    --primary-gradient-end: #764ba2;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* ✅ ألوان الخلفية والنصوص (تباين عالي واحترافي) */
    --light-bg: #f8fafc;
    --medium-bg: #f1f5f9;
    --border-color: #e2e8f0;
    --dark-text: #0f172a;      /* Slate 900 */
    --medium-text: #334155;    /* Slate 700 */
    --light-text: #64748b;     /* Slate 500 */
    
    /* ✅ الظلال والانتقالات */
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    --hover-shadow: 0 15px 35px rgba(102, 126, 234, 0.2);
    --modal-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --transition-fast: all 0.2s ease;
    --transition-medium: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* ✅ الحدود المنحنية */
    --border-radius-small: 8px;
    --border-radius-medium: 14px;
    --border-radius-large: 20px;
    --border-radius-xl: 24px;
}

/* ================================================
   StudyMate - Video Button Container
   ================================================ */
.video-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
    max-width: 100%;
}

.sm-lesson-button-container {
    text-align: center;
    margin: 30px auto 20px;
    padding: 30px 25px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: var(--border-radius-xl);
    border: 2px solid #bfdbfe;
    box-shadow: 0 10px 35px rgba(102, 126, 234, 0.15);
    max-width: 650px;
    width: 95%;
    animation: fadeInUp 0.6s ease;
}

.sm-start-lesson-btn {
    padding: 16px 40px;
    background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 20px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    transition: var(--transition-medium);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-decoration: none;
}

.sm-start-lesson-btn:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.6);
    color: white;
}

/* ================================================
   Student Interface - واجهة الطالب
   ================================================ */
.studymate-student-interface {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    z-index: 999999;
    overflow-y: auto; /* شريط تمرير واحد للواجهة كاملة */
    padding: 20px;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    direction: rtl;
}

.sm-close-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--error-color) 0%, #dc2626 100%);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
    z-index: 1000000; /* أعلى من أي عنصر داخلي */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-medium);
}

.sm-close-btn:hover {
    transform: scale(1.1) rotate(90deg);
}

/* ================================================
   Section Cards - بطاقات الأقسام
   ================================================ */
.section-card {
    background: white;
    border-radius: var(--border-radius-large);
    padding: 30px;
    box-shadow: var(--card-shadow);
    border: 2px solid var(--border-color);
    transition: var(--transition-medium);
    cursor: pointer;
    width: 100%;
    max-width: 100%; /* متجاوب بالكامل */
    position: relative;
}

.section-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
    border-color: var(--primary-gradient-start);
}

/* ================================================
   Action Buttons - أزرار الأقسام
   ================================================ */
.action-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--border-radius-medium);
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: white;
    text-decoration: none;
}

.action-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    color: white;
}

.action-btn.exercises-btn { background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%); }
.action-btn.mindmap-btn { background: linear-gradient(135deg, var(--success-color) 0%, #0ea5e9 100%); }
.action-btn.view-btn { background: linear-gradient(135deg, var(--warning-color) 0%, #ea580c 100%); }

/* ================================================
   Float Modal - الواجهة العائمة للدروس (مُصححة لمنع التمرير المزدوج)
   ================================================ */
.sm-float-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    z-index: 999999;
    padding: 15px;
    animation: fadeIn 0.3s ease;
    display: flex; /* استخدام Flexbox لمحاذاة آمنة على جميع الشاشات */
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.sm-float-modal-content {
    background: white;
    border-radius: var(--border-radius-large);
    width: 100%;
    max-width: 1200px;
    max-height: 90vh; /* يمنع تجاوز ارتفاع الشاشة */
    box-shadow: var(--modal-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden; /* يمنع التمرير في الحاوية الرئيسية */
    position: relative;
}

.sm-float-modal-header {
    background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
    color: white;
    padding: 18px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0; /* يمنع انكماش الهيدر */
}

.sm-float-modal-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sm-float-modal-actions {
    display: flex;
    gap: 10px;
}

.sm-float-modal-body {
    flex: 1;
    overflow-y: auto; /* شريط التمرير الوحيد يظهر هنا فقط إذا لزم الأمر */
    background: var(--light-bg);
    padding: 20px;
}

.sm-float-modal-body::-webkit-scrollbar { width: 8px; }
.sm-float-modal-body::-webkit-scrollbar-track { background: #f1f5f9; border-radius: 10px; }
.sm-float-modal-body::-webkit-scrollbar-thumb { background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%); border-radius: 10px; }

.sm-float-modal-body iframe {
    width: 100%;
    height: 100%;
    min-height: 500px;
    border: none;
    border-radius: var(--border-radius-medium);
}

/* ================================================
   Dashboard Modals - نوافذ لوحة التحكم
   ================================================ */
.sm-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.6);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
    backdrop-filter: blur(4px);
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto; /* يسمح بالتمرير للشاشة الصغيرة */
}

.sm-modal-content {
    background: white;
    padding: 35px;
    border-radius: var(--border-radius-large);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto; /* شريط تمرير واحد مضمون */
    animation: smSlideUp 0.3s ease;
    box-shadow: var(--modal-shadow);
}

.sm-modal-large .sm-modal-content {
    max-width: 950px;
}

.sm-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.sm-modal-header h3 {
    margin: 0;
    font-size: 22px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--dark-text);
    font-weight: 800;
}

.sm-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--light-text);
    transition: var(--transition-fast);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
}

.sm-close:hover {
    background: #fee2e2;
    color: var(--error-color);
    transform: rotate(90deg);
}

.sm-modal-body {
    /* إزالة overflow-y من هنا لمنع التمرير المزدوج */
    overflow-y: visible; 
}

/* ================================================
   Mindmap Student - الخريطة الذهنية للطالب
   ================================================ */
.mindmap-student-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000000;
    animation: fadeIn 0.4s ease;
    padding: 20px;
    overflow: auto;
    backdrop-filter: blur(5px);
}

.mindmap-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    border-radius: 32px;
    padding: 40px 30px;
    box-shadow: var(--modal-shadow);
    max-width: 1200px;
    width: 100%;
    margin: auto;
}

.central-node {
    background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
    color: white;
    padding: 30px 50px;
    border-radius: 50px;
    font-size: 28px;
    font-weight: 800;
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
    animation: pulse 2s infinite, float 3s ease-in-out infinite;
    text-align: center;
    margin-bottom: 50px;
    max-width: 90%;
    word-wrap: break-word;
}

.branches-container {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
    width: 100%;
}

.branch-card {
    padding: 20px 25px;
    border-radius: 16px;
    cursor: pointer;
    transition: var(--transition-medium);
    font-weight: 700;
    font-size: 15px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    min-width: 160px;
    max-width: 220px;
    color: white;
    background: linear-gradient(135deg, var(--info-color) 0%, var(--primary-gradient-start) 100%);
}

.branch-card:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

/* ================================================
   Exercise Student Modal - تمارين الطالب
   ================================================ */
.exercise-student-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    z-index: 9999999;
    animation: fadeIn 0.3s ease;
    display: flex;
    flex-direction: column;
}

/* ================================================
   Buttons & Badges - الأزرار والشارات العامة
   ================================================ */
.sm-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius-medium);
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-medium);
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.sm-btn-primary { background: linear-gradient(135deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%); color: white; }
.sm-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4); color: white; }
.sm-btn-secondary { background: white; color: var(--primary-gradient-start); border: 2px solid var(--primary-gradient-start); }
.sm-btn-secondary:hover { background: var(--primary-gradient-start); color: white; }
.sm-btn-ghost { background: var(--medium-bg); color: var(--medium-text); }
.sm-btn-danger { background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%); color: white; }
.sm-btn-sm { padding: 8px 14px; border: none; border-radius: var(--border-radius-small); font-size: 12px; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; transition: var(--transition-fast); }
.sm-btn-full { width: 100%; justify-content: center; margin-top: 15px; }

.sm-badge-sm {
    padding: 5px 10px;
    background: white;
    border-radius: var(--border-radius-small);
    font-size: 11px;
    font-weight: 700;
    border: 1px solid var(--border-color);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.sm-badge-primary { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }
.sm-badge-success { background: #dcfce7; color: #166534; border-color: #86efac; }
.sm-badge-warning { background: #fef3c7; color: #92400e; border-color: #fde68a; }
.sm-badge-info { background: #e0e7ff; color: #3730a3; border-color: #c7d2fe; }

.sm-grade-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: white;
}
.grade-excellent { background: var(--success-color); }
.grade-very-good { background: var(--info-color); }
.grade-good { background: #8b5cf6; }
.grade-pass { background: var(--warning-color); }
.grade-needs-work { background: var(--error-color); }
.grade-not-started { background: #94a3b8; }

/* ================================================
   Progress Bar - شريط التقدم
   ================================================ */
.sm-progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
}

.sm-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-gradient-start) 0%, var(--primary-gradient-end) 100%);
    border-radius: 10px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================
   Lists & Summaries - القوائم والملخصات
   ================================================ */
.sm-student-lessons-list { display: grid; gap: 15px; }
.sm-student-lesson-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius-large);
    border: 2px solid var(--border-color);
    transition: var(--transition-medium);
}
.sm-student-lesson-item:hover { border-color: var(--primary-gradient-start); transform: translateX(-5px); box-shadow: var(--hover-shadow); }
.sm-student-lesson-info { flex: 1; }
.sm-student-lesson-meta { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }

.sm-lessons-list, .sm-students-list { display: grid; gap: 10px; }
.sm-lesson-item, .sm-student-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 18px;
    background: var(--light-bg);
    border-radius: var(--border-radius-medium);
    transition: var(--transition-fast);
    gap: 15px;
    flex-wrap: wrap;
    border: 1px solid transparent;
}
.sm-lesson-item:hover, .sm-student-item:hover { background: #eff6ff; transform: translateX(-4px); border-color: #bfdbfe; }

.sm-lesson-info, .sm-student-info-col { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 200px; }
.sm-lesson-info small, .sm-student-info-col small { color: var(--light-text); font-size: 12px; font-weight: 600; }
.sm-lesson-meta, .sm-student-stats-col { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.sm-lesson-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.sm-student-rank { font-size: 24px; font-weight: 800; color: var(--primary-gradient-start); min-width: 40px; text-align: center; }

.sm-subject-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
    padding: 22px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: var(--border-radius-large);
    border: 2px solid #bfdbfe;
}
.sm-summary-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    background: white;
    border-radius: var(--border-radius-medium);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: var(--transition-fast);
}
.sm-summary-item:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(0,0,0,0.08); }
.sm-summary-item i { font-size: 28px; color: var(--primary-gradient-start); }
.sm-summary-item strong { font-size: 24px; font-weight: 800; color: var(--dark-text); display: block; line-height: 1; }
.sm-summary-item span { font-size: 12px; color: var(--light-text); font-weight: 600; margin-top: 3px; }

/* ================================================
   Tabs - التبويبات
   ================================================ */
.sm-details-tabs { display: flex; gap: 10px; margin-bottom: 20px; border-bottom: 2px solid var(--border-color); }
.sm-tab-btn {
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-weight: 700;
    color: var(--light-text);
    transition: var(--transition-fast);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 10px 10px 0 0;
}
.sm-tab-btn:hover { color: var(--primary-gradient-start); background: #eff6ff; }
.sm-tab-btn.active { color: var(--primary-gradient-start); border-bottom-color: var(--primary-gradient-start); background: #eff6ff; }
.sm-tab-content { display: none; }
.sm-tab-content.active { display: block; animation: fadeIn 0.3s; }

/* ================================================
   Empty State - الحالة الفارغة
   ================================================ */
.sm-empty { text-align: center; padding: 40px; color: var(--light-text); font-size: 16px; font-weight: 600; }
.sm-empty-state { text-align: center; padding: 60px 30px; grid-column: 1 / -1; background: var(--light-bg); border-radius: var(--border-radius-large); border: 2px dashed var(--border-color); }
.sm-empty-state i { font-size: 64px; color: #94a3b8; margin-bottom: 20px; }
.sm-empty-state h3 { font-size: 22px; color: var(--dark-text); margin: 0 0 10px 0; font-weight: 700; }
.sm-empty-state p { color: var(--light-text); font-size: 15px; max-width: 400px; margin: 0 auto; }

/* ================================================
   Animations - الحركات
   ================================================ */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes smSlideUp { from { transform: translateY(40px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ================================================
   Responsive Design - التصميم المتجاوب الشامل
   ================================================ */

/* أجهزة التابلت والشاشات المتوسطة */
@media (max-width: 1024px) {
    .sm-subject-summary { grid-template-columns: repeat(2, 1fr); }
    .sm-float-modal-content { max-width: 95%; }
}

/* أجهزة الموبايل والتابلت الصغير */
@media (max-width: 768px) {
    .studymate-student-interface { padding: 15px; }
    .sm-close-btn { top: 15px; left: 15px; width: 45px; height: 45px; font-size: 22px; }
    
    .sm-lesson-button-container {
        max-width: 100%;
        margin: 20px 0;
        padding: 25px 20px;
    }
    .sm-start-lesson-btn { width: 100%; font-size: 18px; padding: 16px; }
    
    .section-card { padding: 25px; }
    
    .sm-float-modal { padding: 10px; align-items: flex-start; } /* يبدأ من الأعلى في الموبايل */
    .sm-float-modal-content { max-height: 95vh; border-radius: var(--border-radius-medium); }
    .sm-float-modal-header { padding: 15px; }
    .sm-float-modal-header h3 { font-size: 16px; }
    
    .sm-modal-content { padding: 25px 20px; max-height: 95vh; }
    .sm-modal-header h3 { font-size: 20px; }
    
    .sm-subject-summary { grid-template-columns: 1fr; }
    
    .sm-lesson-item, .sm-student-item, .sm-student-lesson-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    .sm-lesson-actions, .sm-student-stats-col, .sm-student-lesson-meta {
        width: 100%;
        justify-content: flex-start;
    }
    .sm-btn-full { width: 100%; }
    
    .central-node { font-size: 22px; padding: 25px 30px; margin-bottom: 30px; }
    .branch-card { min-width: 140px; max-width: 100%; font-size: 14px; padding: 15px; }
    .branches-container { gap: 15px; }
    
    .sm-details-tabs { overflow-x: auto; white-space: nowrap; padding-bottom: 5px; }
    .sm-tab-btn { flex-shrink: 0; }
}

/* شاشات الموبايل الصغيرة جداً */
@media (max-width: 480px) {
    .sm-lesson-button-container { padding: 20px 15px; }
    .action-btn { font-size: 15px; padding: 12px; }
    .sm-summary-item strong { font-size: 20px; }
    .sm-summary-item i { font-size: 24px; }
    .mindmap-container { padding: 25px 15px; }
}