/* ============================================================
   D-SYSTEM AI Tutor - Student CSS
   ============================================================ */

:root {
    --primary: #3a8fd9;
    --primary-dark: #2e72ae;
    --secondary: #00b4d8;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #3498db;
    --dark: #1a1a2e;
    --gray: #6c757d;
}

/* Navbar */
.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
}

/* Cards */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.3s;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.card-header {
    background: white;
    border-bottom: 1px solid #f0f2f5;
    font-weight: 600;
    padding: 1rem 1.25rem;
    border-radius: 16px 16px 0 0 !important;
}

/* Stat Cards */
.stat-card {
    background: white;
    border-radius: 16px;
    padding: 1.25rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.3s;
    text-align: center;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.stat-label {
    color: var(--gray);
    font-size: 0.75rem;
}

/* Progress */
.progress {
    border-radius: 8px;
    background: #f0f2f5;
}

/* Avatar */
.avatar-initials {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* Hover */
.hover-bg:hover {
    background: #f8f9fa;
    cursor: pointer;
}

/* Notifications */
.notification-item {
    font-size: 0.875rem;
}

.notification-item:last-child {
    border-bottom: none !important;
    margin-bottom: 0 !important;
    padding-bottom: 0 !important;
}

/* Responsive */
@media (max-width: 768px) {
    .stat-card {
        padding: 1rem;
    }
    .stat-number {
        font-size: 1.25rem;
    }
}
/* ============================================================
   Navbar Dark - เพิ่มความชัดเจน
   ============================================================ */

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    transition: color 0.2s;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: #ffffff !important;
}

.navbar-dark .navbar-nav .nav-link.active {
    color: #ffffff !important;
    font-weight: 600;
}

.navbar-dark .navbar-brand {
    color: #ffffff !important;
}

.navbar-dark .navbar-brand:hover {
    color: #ffffff !important;
}

/* ปรับ Navbar ให้ดูเด่นขึ้น */
.navbar {
    background: #1a1a2e !important;
    border-bottom: 2px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
}

/* Dropdown menu */
.navbar-dark .dropdown-menu {
    background: #1a1a2e;
    border: 1px solid rgba(255,255,255,0.1);
}

.navbar-dark .dropdown-item {
    color: rgba(255, 255, 255, 0.8);
}

.navbar-dark .dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

/* ปุ่ม Toggle (Mobile) */
.navbar-dark .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.3);
}

.navbar-dark .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ปรับ dropdown ให้อ่านง่าย */
.navbar-dark .dropdown-menu .dropdown-item {
    color: rgba(255, 255, 255, 0.85) !important;
}
.navbar-dark .dropdown-menu .dropdown-item:hover {
    background: rgba(58, 143, 217, 0.3) !important;
    color: #ffffff !important;
}
.navbar-dark .dropdown-divider {
    border-color: rgba(255,255,255,0.1);
}
/* ✅ แก้ไข Navbar ให้ตัวหนังสือชัดเจน */
.navbar-dark .navbar-nav .nav-link {
    color: #ffffff !important;
}
.navbar-dark .navbar-nav .nav-link:hover {
    color: #ffffff !important;
}
.navbar-dark .navbar-nav .nav-link.active {
    color: #ffffff !important;
    font-weight: 700;
}
.navbar-dark .navbar-brand {
    color: #ffffff !important;
}
.navbar {
    background: #1a1a2e !important;
    border-bottom: 2px solid #3a8fd9;
}