/* ===== GLOBAL STYLES & VARIABLES ===== */
:root {
    --primary-color: #0052cc;
    --secondary-color: #ffab00;
    --bg-color: #f4f5f7;
    --text-color: #172b4d;
    --text-light: #5e6c84;
    --border-color: #dfe1e6;
    --white: #ffffff;
    --green: #36b37e;
    --red: #de350b;
    --font-family: 'Be Vietnam Pro', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

/* ===== LOGIN PAGE ===== */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, #003e99 100%);
}

.login-form {
    background-color: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-logo {
    width: 150px;
    margin-bottom: 10px;
}

.login-form h2 {
    margin-bottom: 25px;
    color: var(--text-color);
    font-weight: 500;
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.login-options {
    text-align: right;
    margin-bottom: 25px;
}

.forgot-password {
    font-size: 14px;
    color: var(--text-light);
}

.btn-login {
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-login:hover {
    background-color: #003e99;
}

/* ===== DASHBOARD LAYOUT ===== */
.app-container {
    display: flex;
    height: 100vh;
    background-color: var(--bg-color);
}

.sidebar {
    width: 260px;
    background-color: var(--white);
    padding: 20px;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: transform 0.3s ease-in-out;
}

.sidebar-header .logo {
    width: 130px;
    display: block;
    margin: 0 auto 25px auto;
}

.user-profile {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}
.user-profile .avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 10px;
    border: 3px solid var(--primary-color);
}
.user-profile .user-name {
    display: block;
    font-weight: 700;
    font-size: 18px;
}
.user-profile .user-role {
    font-size: 14px;
    color: var(--text-light);
}

.menu-group-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-light);
    text-transform: uppercase;
    margin-top: 20px;
    margin-bottom: 10px;
    padding: 0 15px;
}

.sidebar-nav ul {
    list-style: none;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: var(--text-light);
    border-radius: 8px;
    margin-bottom: 5px;
    transition: background-color 0.2s, color 0.2s;
}
.sidebar-nav a:hover, .sidebar-nav a.active {
    background-color: #e9f2ff;
    color: var(--primary-color);
    font-weight: 500;
}
.sidebar-nav .icon {
    width: 20px; height: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    margin-right: 15px;
}

.main-content {
    flex: 1;
    padding: 25px;
    overflow-y: auto;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}
.header-left {
    display: flex;
    align-items: center;
}
.header-left h1 {
    font-size: 28px;
    font-weight: 700;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    margin-right: 15px;
}
.menu-toggle .icon {
    width: 24px; height: 24px;
    background-size: contain;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}
.search-bar input {
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 8px 15px;
    width: 250px;
}
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
}
.icon-btn .icon {
    width: 24px; height: 24px;
    background-size: contain;
}
.avatar-small {
    width: 40px; height: 40px;
    border-radius: 50%;
}

/* ===== DASHBOARD WIDGETS (CARDS) ===== */
.card {
    background-color: var(--white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.card h3 {
    margin-bottom: 20px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 25px;
}
.full-width {
    grid-column: 1 / -1;
}

/* My Courses Card */
.course-list {
    display: flex;
    gap: 20px;
}
.course-item {
    flex: 1;
    display: flex;
    gap: 15px;
    align-items: center;
}
.course-item img {
    width: 100px;
    height: 70px;
    object-fit: cover;
    border-radius: 8px;
}
.course-info h4 {
    font-size: 16px;
    margin-bottom: 5px;
}
.course-info p {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 10px;
}
.progress-bar {
    background-color: #e0e0e0;
    border-radius: 10px;
    height: 8px;
    width: 100%;
}
.progress {
    background-color: var(--primary-color);
    height: 100%;
    border-radius: 10px;
}

/* Overview Card */
.stats-container {
    display: flex;
    justify-content: space-around;
    margin-bottom: 25px;
}
.stat-item {
    display: flex;
    align-items: center;
    gap: 15px;
}
.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.stat-icon .icon {
    width: 24px;
    height: 24px;
    background-size: contain;
}
.stat-info .stat-number {
    font-size: 24px;
    font-weight: 700;
    display: block;
}
.stat-info .stat-label {
    font-size: 14px;
    color: var(--text-light);
}
#myChart {
    max-height: 200px;
}

/* Achievements & Messages Card */
.tab-buttons {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}
.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    position: relative;
    color: var(--text-light);
}
.tab-btn.active {
    color: var(--primary-color);
    font-weight: 700;
}
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 20px;
    text-align: center;
}
.achievement-item img {
    width: 60px;
    height: 60px;
    margin-bottom: 5px;
}
.achievement-item span {
    font-size: 12px;
}
.achievement-item.locked img {
    filter: grayscale(100%);
    opacity: 0.5;
}

.message-list { list-style: none; }
.message-item {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}
.message-item:last-child { border: none; }
.message-title { font-size: 14px; margin-bottom: 4px; }
.message-time { font-size: 12px; color: var(--text-light); }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: 1fr 1fr;
    }
    #my-courses {
        grid-column: 1 / -1;
    }
}
@media (max-width: 992px) {
    .header-right .search-bar { display: none; }
    .course-list {
        flex-direction: column;
    }
}
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0; top: 0; bottom: 0;
        z-index: 1000;
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: 10px 0 20px rgba(0,0,0,0.1);
    }
    .menu-toggle {
        display: block;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .header-left h1 {
        font-size: 22px;
    }
}