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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============ Header ============ */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
    animation: slideDown 0.6s ease-out;
}

.header-content {
    padding: 20px 0;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ============ Main Content ============ */
.main-content {
    flex: 1;
    margin-bottom: 30px;
}

.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    animation: slideUp 0.6s ease-out;
}

/* ============ Sections ============ */
.config-section,
.action-section,
.results-section {
    margin-bottom: 30px;
}

.config-section:last-of-type {
    margin-bottom: 0;
}

.section-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 25px;
    color: #2d3748;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

/* ============ Form Elements ============ */
.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #2d3748;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.95rem;
}

.label-text {
    flex: 1;
}

.help-link {
    color: #667eea;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

.help-link:hover {
    color: #764ba2;
    text-decoration: underline;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
    color: #333;
}

.input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input:hover:not(:focus) {
    border-color: #cbd5e0;
}

.input.error {
    border-color: #f56565;
    background: #fff5f5;
}

.select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23667eea' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    color: #718096;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-password:hover {
    color: #667eea;
    background: #f7fafc;
}

.label input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #667eea;
}

/* ============ Buttons ============ */
.btn {
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.action-section {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover:not(:disabled) {
    background: #f7fafc;
    transform: translateY(-2px);
}

.btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    display: inline-block;
}

/* ============ Loading State ============ */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e2e8f0;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loadingText {
    color: #718096;
    font-size: 1rem;
    font-weight: 500;
}

/* ============ Alerts ============ */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease-out;
}

.alert-info {
    background: #e6f7ff;
    color: #0050b3;
    border: 1px solid #91d5ff;
}

.alert-success {
    background: #f6ffed;
    color: #274e1b;
    border: 1px solid #b7eb8f;
}

.alert-error {
    background: #fff2f0;
    color: #92400e;
    border: 1px solid #ffccc7;
}

/* ============ Results Section ============ */
.summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: 500;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.data-table thead {
    background: #f7fafc;
    border-bottom: 2px solid #e2e8f0;
}

.data-table th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: #2d3748;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid #e2e8f0;
    color: #4a5568;
    font-size: 0.95rem;
}

.data-table tbody tr:hover {
    background: #f7fafc;
}

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

/* ============ Footer ============ */
.footer {
    text-align: center;
    color: white;
    padding: 20px;
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ============ Animations ============ */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* ============ Responsive Design ============ */
@media (max-width: 768px) {
    .card {
        padding: 24px 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .action-section {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .title {
        font-size: 1.8rem;
    }

    .summary-stats {
        grid-template-columns: 1fr;
    }

    .data-table {
        font-size: 0.85rem;
    }

    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .header {
        margin-bottom: 24px;
    }

    .title {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.2rem;
    }

    .card {
        padding: 16px 12px;
    }
}