:root {
    --primary-color: #0d47a1;
    --secondary-color: #1976d2;
    --accent-color: #ff9800;
    --text-color: #334155;
    --light-bg: #f8fafc;
    --dark-bg: #0f172a;
    --white: #ffffff;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--light-bg);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

header a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
}

header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

header nav a {
    margin-left: 1.5rem;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

header nav a:hover {
    opacity: 1;
}

main {
    flex: 1;
    padding: 2.5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

footer {
    background-color: var(--dark-bg);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    margin-top: auto;
    font-size: 0.875rem;
    opacity: 0.9;
}
@media (max-width: 768px) {
    footer {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.625rem 1.25rem;
    text-decoration: none;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn:active {
    transform: translateY(1px);
    box-shadow: none;
}

.btn-accent {
    background-color: var(--accent-color);
    color: #fff;
}
.btn-accent:hover {
    background-color: #f57c00;
}
.btn-outline {
    background-color: transparent;
    border: 1px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
    background-color: rgba(255,255,255,0.1);
    border-color: var(--white);
}

.card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.025);
    margin-bottom: 2rem;
}
.card h2 {
    margin-top: 0;
    color: var(--primary-color);
}
.card h3 {
    margin-top: 0;
    color: var(--dark-bg);
}

.hero {
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(13, 71, 161, 0.8)), url('https://images.unsplash.com/photo-1544413155-fb5361de41ff?auto=format&fit=crop&q=80&w=1600') center/cover no-repeat;
    color: var(--white);
    padding: 6rem 2rem;
    border-radius: 16px;
    margin-bottom: 3rem;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    line-height: 1.7;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    box-sizing: border-box;
    transition: all 0.2s ease;
    background-color: var(--white);
}
textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.15);
}

.table-responsive {
    overflow-x: auto;
}
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.table th, .table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: #f1f5f9;
    color: var(--text-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background-color: #f8fafc;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    font-weight: 500;
}
.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}
.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}
.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}