/* Aspect Ratio Calculator Styles */
:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-primary: #9146ff;
    --accent-secondary: #6441a5;
    --success: #10b981;
    --border-color: #333;
    --border-radius: 12px;
    --transition: 0.2s ease;
}

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

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

.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.back-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.9rem;
}

.back-link:hover {
    text-decoration: underline;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* Sections */
.input-section,
.output-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.mode-btn {
    flex: 1;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.mode-btn.active {
    background: rgba(145, 70, 255, 0.2);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
}

/* Form Groups */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-group label svg {
    color: var(--accent-primary);
}

input[type="number"],
select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

input:focus,
select:focus {
    border-color: var(--accent-primary);
    outline: none;
}

.dimension-inputs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.dimension-inputs>div {
    flex: 1;
}

.small-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.or-text {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(145, 70, 255, 0.3);
}

/* Aspect Preview */
.aspect-preview {
    display: flex;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.preview-box {
    width: 160px;
    height: 90px;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    transition: var(--transition);
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.result-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.result-card.full-width {
    grid-column: span 2;
}

.result-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.result-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
}

/* Common Resolutions */
.common-resolutions {
    margin-bottom: 1rem;
}

.common-resolutions h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.resolution-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.res-btn {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.res-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Help Text */
.help-text {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.help-text strong {
    color: var(--text-primary);
}

/* FAQ Section */
.faq-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.faq-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
}

.faq-item {
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.faq-item h3 {
    font-size: 1rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    margin-top: 2rem;
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
}


/* SEO Guide Section */
.seo-guide {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 1.5rem;
    color: var(--text-secondary);
}

.seo-guide h2 {
    color: var(--text-primary);
    font-size: 2rem;
    margin: 3rem 0 1.5rem;
    text-align: center;
}

.seo-guide h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

.seo-guide p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

.seo-guide ul,
.seo-guide ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.seo-guide li {
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.seo-guide a {
    color: var(--accent-primary);
    text-decoration: none;
}

.seo-guide a:hover {
    text-decoration: underline;
}

.seo-guide strong {
    color: var(--text-primary);
}

.guide-highlight {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent-primary);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 12px 12px 0;
}