/* Reset a základní styly */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --dark-color: #2c3e50;
    --light-gray: #ecf0f1;
    --border-color: #bdc3c7;
    --text-color: #333;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigace */
.navbar {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Hlavní obsah */
main {
    flex: 1;
    padding: 2rem 0;
}

/* Formulář kontejner */
.form-container {
    background: var(--white);
    border-radius: 10px;
    padding: 2rem;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-hover);
}

h1 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.subtitle {
    color: #7f8c8d;
    margin-bottom: 2rem;
}

/* Formulářové skupiny */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-color);
}

.required {
    color: var(--danger-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
}

.form-control:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Tlačítka */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--light-gray);
    color: var(--dark-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

/* Flash zprávy */
.flash-messages {
    margin-bottom: 1.5rem;
}

.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    position: relative;
    animation: slideIn 0.3s ease-out;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.close-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.5;
}

.close-btn:hover {
    opacity: 1;
}

/* Info box */
.info-box {
    background-color: #e8f4f8;
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-top: 2rem;
    border-radius: 5px;
}

.info-box h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.info-box ul {
    margin-left: 1.5rem;
}

.info-box li {
    margin-bottom: 0.5rem;
}

/* Success page */
.success-container {
    background: var(--white);
    border-radius: 10px;
    padding: 3rem 2rem;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    box-shadow: var(--shadow-hover);
}

.success-icon {
    width: 100px;
    height: 100px;
    background-color: var(--success-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin: 0 auto 1.5rem;
    animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
    }
    to {
        transform: scale(1);
    }
}

.success-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* Submissions page */
.submissions-container {
    background: var(--white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow-hover);
}

.submissions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.submission-card {
    background: var(--light-gray);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.submission-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.submission-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.submission-table {
    width: 100%;
    border-collapse: collapse;
}

.submission-table tr {
    border-bottom: 1px solid var(--border-color);
}

.submission-table td {
    padding: 0.5rem 0;
    vertical-align: top;
}

.label-cell {
    width: 40%;
    color: var(--dark-color);
}

.empty-state {
    text-align: center;
    padding: 3rem;
}

.empty-state p {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 1.5rem;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: var(--white);
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

/* Responzivní design */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .form-container,
    .success-container,
    .submissions-container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    .submissions-grid {
        grid-template-columns: 1fr;
    }
    
    .success-actions {
        flex-direction: column;
    }
    
    .success-actions .btn {
        width: 100%;
    }
}