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

body {
    font-family: 'Segoe UI', sans-serif;
    background: #f5f5f5;
    color: #222;
}

nav {
    background: #1B3A6B;
    padding: 12px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav .logo img {
    height: 48px;
    display: block;
}
nav a {
    color: #cdd8ed;
    text-decoration: none;
    margin-left: 22px;
    font-size: 14px;
}
nav a:hover { color: #F5A623; }
nav .btn-nav {
    background: #F5A623;
    color: #1B3A6B;
    padding: 8px 20px;
    border-radius: 5px;
    font-weight: 700;
    margin-left: 16px;
}
nav .btn-nav:hover { background: #e09510; color: #1B3A6B; }

.hero {
    background: linear-gradient(135deg, #1B3A6B 0%, #0f2448 100%);
    color: #fff;
    padding: 90px 40px;
    text-align: center;
}
.hero .tagline {
    color: #F5A623;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
}
.hero h1 { font-size: 44px; margin-bottom: 16px; line-height: 1.2; }
.hero p  { font-size: 18px; color: #aec3e8; margin-bottom: 32px; }

.btn {
    display: inline-block;
    padding: 13px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    border: none;
    font-size: 15px;
    transition: opacity 0.2s;
}
.btn-primary  { background: #F5A623; color: #1B3A6B; }
.btn-secondary { background: transparent; color: #fff; border: 2px solid #fff; margin-left: 14px; }
.btn:hover { opacity: 0.88; }

.section { padding: 54px 40px; }
.section h2 {
    font-size: 26px;
    margin-bottom: 6px;
    color: #1B3A6B;
}
.section .section-sub {
    color: #777;
    font-size: 14px;
    margin-bottom: 28px;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
    gap: 24px;
}
.course-card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}
.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(27,58,107,0.13);
}
.course-card img { width: 100%; height: 165px; object-fit: cover; }
.course-card-body { padding: 16px; }
.course-card h3 { font-size: 15px; margin-bottom: 6px; color: #1B3A6B; line-height: 1.4; }
.course-card .instructor { font-size: 13px; color: #777; margin-bottom: 8px; }
.course-card .rating { color: #F5A623; font-size: 13px; margin-bottom: 8px; }
.course-card .price { font-size: 19px; font-weight: 700; color: #1B3A6B; }
.course-card .price.free { color: #1e8449; }
.course-card a { text-decoration: none; color: inherit; }

.form-container {
    max-width: 470px;
    margin: 60px auto;
    background: #fff;
    padding: 42px;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.10);
}
.form-container .form-logo {
    text-align: center;
    margin-bottom: 24px;
}
.form-container .form-logo img { height: 60px; }
.form-container h2 {
    margin-bottom: 24px;
    font-size: 22px;
    color: #1B3A6B;
    text-align: center;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #444;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: #1B3A6B; }

.alert {
    padding: 11px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-danger  { background: #fde8ec; color: #c0392b; }
.alert-success { background: #e8f8f0; color: #1e8449; }

.dashboard { display: flex; min-height: calc(100vh - 72px); }
.sidebar {
    width: 245px;
    background: #1B3A6B;
    padding: 30px 16px;
    flex-shrink: 0;
}
.sidebar .sidebar-logo { text-align: center; margin-bottom: 30px; }
.sidebar .sidebar-logo img { height: 44px; }
.sidebar a {
    display: block;
    color: #aec3e8;
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 4px;
    font-size: 14px;
}
.sidebar a:hover,
.sidebar a.active { background: #F5A623; color: #1B3A6B; font-weight: 700; }
.main-content { flex: 1; padding: 32px 42px; }
.main-content h2 { color: #1B3A6B; margin-bottom: 24px; }

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}
.stat-card {
    background: #fff;
    padding: 26px 20px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    text-align: center;
    border-top: 4px solid #F5A623;
}
.stat-card .number { font-size: 34px; font-weight: 700; color: #1B3A6B; }
.stat-card .label  { font-size: 13px; color: #777; margin-top: 4px; }

table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
th, td { padding: 13px 16px; text-align: left; font-size: 14px; border-bottom: 1px solid #f0f0f0; }
th { background: #1B3A6B; color: #fff; font-weight: 600; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafbff; }

footer {
    background: #1B3A6B;
    color: #7a99c8;
    text-align: center;
    padding: 22px;
    font-size: 13px;
}
footer span { color: #F5A623; }