/* reset & base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: #f8f9fa;
    color: #212529;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #ffffff;
    border-bottom: 2px solid #e9ecef;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #1e293b;
}

.logo span {
    color: #4a2c6b; /* سرمه‌ای */
}

nav a {
    margin: 0 0.5rem;
    text-decoration: none;
    color: #1e293b;
    font-weight: 500;
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    transition: 0.2s;
}

nav a:hover {
    background: #4a2c6b;
    color: #fff;
}

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

.page {
    display: none;
    animation: fade 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fade {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h1, h2, h3 {
    color: #1e293b;
    margin-bottom: 1rem;
}

/* کارت‌ها */
.card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid #e9ecef;
    transition: 0.2s;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(74, 44, 107, 0.08);
}

.contest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.contest-item {
    background: #fff;
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    cursor: pointer;
    transition: 0.2s;
}

.contest-item:hover {
    border-color: #4a2c6b;
    transform: translateY(-4px);
}

.contest-item h3 {
    color: #4a2c6b;
}

.btn {
    display: inline-block;
    background: #4a2c6b;
    color: #fff;
    padding: 0.6rem 1.4rem;
    border: none;
    border-radius: 30px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: 0.2s;
    text-decoration: none;
}

.btn:hover {
    background: #2d1a44;
}

.btn-outline {
    background: transparent;
    border: 2px solid #4a2c6b;
    color: #4a2c6b;
}

.btn-outline:hover {
    background: #4a2c6b;
    color: #fff;
}

/* فرم‌ها */
form {
    max-width: 400px;
    margin: 0 auto;
}

input, textarea, select {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    border: 1px solid #ced4da;
    border-radius: 8px;
    font-size: 1rem;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #4a2c6b;
    box-shadow: 0 0 0 3px rgba(74, 44, 107, 0.1);
}

button[type="submit"] {
    width: 100%;
    padding: 0.8rem;
    background: #4a2c6b;
    color: #fff;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 0.5rem;
}

button[type="submit"]:hover {
    background: #2d1a44;
}

.alert {
    padding: 0.8rem;
    border-radius: 8px;
    margin: 0.5rem 0;
}

.alert-success {
    background: #d4edda;
    color: #155724;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #fff;
    border-top: 2px solid #e9ecef;
    color: #6c757d;
}

/* ریسپانسیو */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    nav a {
        display: inline-block;
        margin: 0.2rem;
    }
}