/* متغيرات الألوان */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --bg-color: #f5f5f5;
    --text-color: #333;
    --card-bg: #fff;
    --sidebar-bg: #fff;
    --navbar-bg: #2c3e50;
    --navbar-text: #fff;
    --border-color: #ddd;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
}

/* الوضع الليلي */
body.night-mode {
    --primary-color: #1a2634;
    --secondary-color: #4a6fa5;
    --bg-color: #1e1e2f;
    --text-color: #eee;
    --card-bg: #2d2d3a;
    --sidebar-bg: #2d2d3a;
    --navbar-bg: #1a1a2b;
    --navbar-text: #eee;
    --border-color: #444;
}

/* إضافات للوضع الليلي */
body.night-mode .nav-icon,
body.night-mode .nav-icon i,
body.night-mode .nav-icon span,
body.night-mode .college-logo {
    color: #fff !important;
}

body.night-mode .nav-icon:hover {
    background-color: rgba(255,255,255,0.15);
}

body.night-mode .nav-icon.active {
    background-color: #4a6fa5;
}

body.night-mode .navbar {
    background-color: #1a1a2b;
}

/* إزالة الخط من جميع الروابط */
a, a:hover, a:focus, a:active {
    text-decoration: none !important;
    outline: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

/* ===== التعديلات الجديدة للشريط العلوي والأيقونات ===== */

/* الشريط العلوي المعدل */
.navbar {
    background-color: var(--navbar-bg);
    color: var(--navbar-text);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    padding: 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    width: 100%;
}

.college-logo {
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--navbar-text);
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 30px;
    transition: all 0.3s ease;
    background-color: rgba(255,255,255,0.1);
    letter-spacing: 0.5px;
}

.college-logo:hover {
    background-color: rgba(255,255,255,0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* إخفاء زر القائمة القديم */
.menu-toggle {
    display: none;
}

/* شريط الأيقونات */
.nav-icons-bar {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background-color: rgba(0,0,0,0.2);
    padding: 8px 0;
    border-top: 1px solid rgba(255,255,255,0.15);
    border-bottom: 1px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(5px);
}

.nav-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--navbar-text);
    padding: 8px 12px;
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    font-size: 0.9rem;
    flex: 1;
    max-width: 90px;
    background-color: transparent;
    border: none;
    cursor: pointer;
    text-decoration: none !important;
}

.nav-icon i {
    font-size: 1.4rem;
    margin-bottom: 4px;
    transition: transform 0.2s;
}

.nav-icon span {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.nav-icon:hover {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.nav-icon:hover i {
    transform: scale(1.1);
}

.nav-icon.active {
    background-color: var(--secondary-color);
    color: white;
    box-shadow: 0 4px 10px rgba(52, 152, 219, 0.4);
}

.nav-icon.active i,
.nav-icon.active span {
    color: white;
}

/* تعديل المسافة للمحتوى الرئيسي */
.main-content {
    margin-top: 130px;
    padding: 20px;
    min-height: calc(100vh - 130px);
}

/* ===== القائمة الجانبية ===== */
.sidebar {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100%;
    background-color: var(--sidebar-bg);
    box-shadow: -5px 0 20px rgba(0,0,0,0.2);
    z-index: 1001;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    border-left: 1px solid var(--border-color);
}

.sidebar.active {
    right: 0;
}

.sidebar-header {
    padding: 25px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, rgba(0,0,0,0.02), transparent);
}

.user-avatar {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 3px solid var(--secondary-color);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.profile-link {
    display: inline-block;
    margin-top: 8px;
    color: var(--secondary-color);
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 30px;
    background-color: rgba(52, 152, 219, 0.1);
    transition: all 0.3s;
    text-decoration: none;
}

.profile-link:hover {
    background-color: rgba(52, 152, 219, 0.2);
    transform: translateY(-2px);
}

.sidebar-menu ul {
    list-style: none;
    padding: 15px 0;
}

.sidebar-menu li {
    padding: 14px 25px;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s;
}

.sidebar-menu li:hover {
    background-color: rgba(0,0,0,0.03);
}

.sidebar-menu li a {
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 15px;
    font-weight: 500;
    text-decoration: none;
}

.sidebar-menu li i {
    width: 25px;
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.night-mode-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 25px;
    border-bottom: 1px solid var(--border-color);
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 26px;
    margin-right: auto;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--secondary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* ===== التنسيقات الأصلية (البطاقات، النماذج، الدردشة، إلخ) ===== */
/* البطاقات */
.card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border: 1px solid var(--border-color);
}

/* نماذج */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: #fff;
}

.btn-danger {
    background-color: var(--danger-color);
    color: #fff;
}

.btn-success {
    background-color: var(--success-color);
    color: #fff;
}

/* شريط التخصصات والفصول في المحاضرات */
.specialization-bar {
    display: flex;
    overflow-x: auto;
    gap: 10px;
    padding: 10px 0;
    margin-bottom: 20px;
    white-space: nowrap;
}

.spec-item {
    padding: 8px 15px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
}

.spec-item.active {
    background-color: var(--secondary-color);
    color: #fff;
}

.semester-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.semester-btn {
    padding: 10px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
}

.semester-btn.active {
    background-color: var(--secondary-color);
    color: #fff;
}

/* بطاقات المحاضرات */
.lecture-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lecture-info h3 {
    margin-bottom: 5px;
}

.lecture-actions {
    display: flex;
    gap: 10px;
}

/* بطاقات الإعلانات */
.announcement-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.announcement-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.announcement-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.announcement-author {
    font-weight: bold;
}

.announcement-time {
    font-size: 0.8rem;
    color: #888;
}

.announcement-content {
    margin: 10px 0;
}

.announcement-media {
    max-width: 100%;
    border-radius: 8px;
    margin: 10px 0;
}

.announcement-actions {
    display: flex;
    gap: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 10px;
    margin-top: 10px;
}

.action-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}

.action-btn.liked {
    color: var(--danger-color);
}

.comment-section {
    margin-top: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.comment-input {
    display: flex;
    gap: 10px;
    align-items: center;
}

.comment-input img {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

.comment-input input {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.comments-list {
    margin-top: 15px;
}

.comment-item {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.comment-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

.comment-body {
    background-color: var(--bg-color);
    padding: 8px 12px;
    border-radius: 15px;
    flex: 1;
}

.comment-author {
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 3px;
}

.comment-text {
    font-size: 0.9rem;
}

.comment-time {
    font-size: 0.7rem;
    color: #888;
}

/* زر الإضافة العائم */
.floating-add {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background-color: var(--secondary-color);
    color: #fff;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    cursor: pointer;
    border: none;
    z-index: 999;
}

/* النوافذ المنبثقة */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

/* الدردشة */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 120px);
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
}

.message {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    max-width: 80%;
}

.message.own {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
}

.message-content {
    background-color: var(--bg-color);
    padding: 8px 12px;
    border-radius: 15px;
    position: relative;
}

.message.own .message-content {
    background-color: var(--secondary-color);
    color: #fff;
}

.message-author {
    font-weight: bold;
    font-size: 0.8rem;
    margin-bottom: 3px;
}

.message-text {
    word-wrap: break-word;
}

.message-time {
    font-size: 0.6rem;
    opacity: 0.7;
    margin-top: 3px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 3px;
}

.message-status {
    font-size: 0.7rem;
}

.chat-input {
    display: flex;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    background-color: var(--card-bg);
}

.chat-input input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.chat-input button {
    background-color: var(--secondary-color);
    color: #fff;
    border: none;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    margin-right: 10px;
    cursor: pointer;
}

/* استجابة للهواتف */
@media (max-width: 768px) {
    .semester-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}