:root {
    --primary-color: #232f3e;
    --secondary-color: #ff9900;
    --accent-color: #146eb4;
    --success-color: #00a651;
    --warning-color: #ff9900;
    --error-color: #d13212;
    --text-primary: #232f3e;
    --text-secondary: #5a6c7d;
    --text-muted: #879196;
    --bg-primary: #ffffff;
    --bg-secondary: #f9f9f9;
    --bg-tertiary: #f1f3f3;
    --border-color: #ddd;
    --border-radius: 8px;
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 2rem;
}

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

/* Main Content */
.main {
    padding: 2rem 0;
}

.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.card h2, .card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.card h2 {
    font-size: 1.5rem;
}

.card h3 {
    font-size: 1.25rem;
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Expression Display */
.expression-display {
    margin-bottom: 2rem;
}

.expression-display label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.expression-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.expression-input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
    min-height: 50px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.expression-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(255, 153, 0, 0.1);
}

.expression-input::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.copy-btn {
    background: var(--secondary-color);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem;
    cursor: pointer;
    font-size: 1.1rem;
    color: white;
    transition: all 0.2s ease;
    min-width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.parse-btn {
    background: var(--accent-color);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem;
    cursor: pointer;
    font-size: 1.2rem;
    color: white;
    transition: all 0.2s ease;
    min-width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn:hover {
    background: #e68a00;
    transform: translateY(-1px);
}

.copy-btn:active {
    transform: translateY(0);
}

.parse-btn:hover {
    background: #0f5a9a;
    transform: translateY(-1px);
}

.parse-btn:active {
    transform: translateY(0);
}

.parse-error {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: #fdf2f2;
    border: 1px solid var(--error-color);
    border-radius: var(--border-radius);
    color: var(--error-color);
    font-size: 0.9rem;
}

.parse-error.hidden {
    display: none;
}

/* Builder Grid */
.builder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.field-group {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.field-label {
    display: block;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.field-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.field-type-select, .field-input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field-type-select:focus, .field-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(20, 110, 180, 0.1);
}

.field-input.hidden {
    display: none;
}

.field-input:placeholder-shown {
    color: var(--text-muted);
}

/* Description Section at Top */
.description-section {
    margin-bottom: 2rem;
}

.description-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--secondary-color);
}

.description-card h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Description Text */
.description-text {
    font-size: 1.15rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.5;
    margin: 0;
}

/* Next Runs */
.next-runs-list {
    display: grid;
    gap: 0.5rem;
}

.next-run-item {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--success-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.next-run-date {
    font-weight: 500;
    color: var(--text-primary);
}

.next-run-relative {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Common Patterns */
.patterns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.pattern-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pattern-item:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

.pattern-expression {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.pattern-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* AWS Info Section */
.info-content {
    display: grid;
    gap: 1.5rem;
}

.info-item h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.info-item p, .info-item li {
    color: var(--text-secondary);
    line-height: 1.6;
}

.info-item ul {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

.info-item li {
    margin-bottom: 0.25rem;
}

.info-item code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    color: var(--accent-color);
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer p {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .header-content h1 {
        font-size: 2rem;
    }

    .builder-grid {
        grid-template-columns: 1fr;
    }

    .patterns-grid {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 1.5rem;
    }

    .expression-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .copy-btn, .parse-btn {
        align-self: stretch;
        height: auto;
        margin-top: 0;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.75rem;
        flex-direction: column;
        gap: 0.25rem;
    }

    .field-group {
        padding: 1rem;
    }

    .card {
        padding: 1rem;
    }
}

/* Animation for smooth transitions */
* {
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* Focus states for accessibility */
.pattern-item:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Success notification */
.copy-success {
    background-color: var(--success-color) !important;
}

.copy-success::after {
    content: " ✓";
}