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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header */
header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

.user-email {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Main content */
main {
    flex: 1;
    padding: 2rem 0;
}

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

.flash {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

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

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

.flash-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.btn-danger {
    background-color: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background-color: #c0392b;
}

/* Login page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    max-width: 500px;
    width: 100%;
}

.login-box h2 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

.login-box.success {
    text-align: center;
}

.success-icon {
    font-size: 4rem;
    margin: 1rem 0;
}

.help-text {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
    font-size: 0.9rem;
    color: #666;
}

.info-notice {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #e7f3ff;
    border-left: 4px solid #2196f3;
    border-radius: 4px;
    font-size: 0.9rem;
    color: #0c5460;
}

/* Graph page */
.graph-page {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.graph-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.graph-header h2 {
    color: #2c3e50;
}

.graph-actions {
    display: flex;
    gap: 0.5rem;
}

.graph-info {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    font-size: 0.9rem;
    color: #666;
}

/* Modal */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: #aaa;
}

.close:hover {
    color: #000;
}

.form-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.form-actions .btn-danger {
    margin-left: auto;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

footer p {
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .graph-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .graph-actions {
        width: 100%;
    }

    .graph-actions .btn {
        flex: 1;
    }
}