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

:root {
    --primary: #0a66c2;
    --primary-dark: #004182;
    --secondary: #057642;
    --background: #f3f2ef;
    --card-bg: #ffffff;
    --text-primary: #191919;
    --text-secondary: #666666;
    --border: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-section,
.manual-input-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 24px;
}

.input-group:last-of-type {
    margin-bottom: 28px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

input[type="url"],
input[type="text"],
select {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #fff;
}

input[type="url"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.1);
}

.helper-text {
    display: block;
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#generation-label {
    font-weight: 500;
    color: var(--primary);
}

.primary-btn {
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.primary-btn:hover {
    background: var(--primary-dark);
}

.primary-btn:active {
    transform: scale(0.98);
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 32px 0;
    color: var(--text-secondary);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border);
}

.divider span {
    padding: 0 16px;
    font-size: 0.9rem;
}

.manual-inputs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

@media (max-width: 600px) {
    .manual-inputs {
        grid-template-columns: 1fr;
    }
}

.results-section {
    margin-top: 32px;
}

.results-section.hidden {
    display: none;
}

.result-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 32px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.result-card h2 {
    font-size: 1.4rem;
    margin-bottom: 16px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.result-card h2::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 2px;
}

.why-card h2::before {
    background: var(--secondary);
}

.why-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
    margin-top: -8px;
}

.explanation {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.explanation p {
    margin-bottom: 16px;
}

.explanation p:last-child {
    margin-bottom: 0;
}

.explanation .highlight {
    background: linear-gradient(120deg, #ffeaa7 0%, #fdcb6e 100%);
    padding: 2px 6px;
    border-radius: 4px;
}

.explanation .analogy {
    background: #f0f7ff;
    border-left: 3px solid var(--primary);
    padding: 12px 16px;
    margin: 16px 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

.context-card h2::before {
    background: #8b5cf6;
}

.context-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (max-width: 600px) {
    .context-grid {
        grid-template-columns: 1fr;
    }
}

.context-item {
    background: #f8f9fa;
    padding: 16px;
    border-radius: 8px;
}

.context-item h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.context-item p {
    font-size: 0.95rem;
    color: var(--text-primary);
}

footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading .primary-btn {
    background: #999;
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    animation: fadeIn 0.4s ease-out;
}

.result-card:nth-child(2) {
    animation-delay: 0.1s;
}

.result-card:nth-child(3) {
    animation-delay: 0.2s;
}