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

:root {
    --bg: #0f0f14;
    --surface: #1a1a24;
    --surface2: #22222f;
    --border: #2a2a3a;
    --text: #e4e4ec;
    --text2: #9898b0;
    --accent: #7c5cfc;
    --accent-hover: #6a48e8;
    --green: #34d399;
    --red: #f87171;
    --radius: 12px;
    --radius-sm: 8px;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--accent), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text2);
    font-size: 0.95rem;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 32px;
}

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

.form-panel, .preview-panel, .output-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.form-panel h2, .preview-panel h2, .output-panel h2 {
    font-size: 1.15rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text2);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input[type="url"],
.form-group input[type="text"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 70px;
}

.hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text2);
    margin-top: 4px;
}

.form-group input[type="checkbox"] {
    accent-color: var(--accent);
    margin-right: 8px;
}

.btn-primary {
    width: 100%;
    padding: 12px 20px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-top: 8px;
}

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

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

.btn-secondary {
    padding: 10px 18px;
    background: var(--surface2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--border);
}

.preview-label {
    color: var(--text2);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.preview-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.tab {
    padding: 6px 14px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text2);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tab.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.card-preview, .twitter-preview {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--surface2);
}

.card-image-placeholder {
    width: 100%;
    aspect-ratio: 1200/630;
    background: var(--surface);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text2);
    font-size: 0.85rem;
    overflow: hidden;
}

.card-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-image-placeholder.has-image span,
.card-image-placeholder.has-image p {
    display: none;
}

.card-body {
    padding: 12px 14px;
}

.card-domain {
    font-size: 0.7rem;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 4px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-desc {
    font-size: 0.8rem;
    color: var(--text2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.twitter-preview {
    border-radius: 14px;
}

.twitter-card-image {
    width: 100%;
    aspect-ratio: 2/1;
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text2);
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.twitter-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.twitter-card-image.has-image span {
    display: none;
}

.twitter-card-body {
    padding: 12px 14px;
}

.twitter-domain {
    font-size: 0.7rem;
    color: var(--text2);
}

.twitter-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin: 3px 0;
}

.twitter-desc {
    font-size: 0.8rem;
    color: var(--text2);
}

.hidden {
    display: none !important;
}

.output-panel {
    margin-top: 0;
}

.output-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.code-preview {
    background: #0a0a10;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    max-height: 400px;
    overflow: auto;
}

.code-preview pre {
    margin: 0;
}

.code-preview code {
    font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    font-size: 0.8rem;
    color: #a5d6ff;
    white-space: pre-wrap;
    word-break: break-all;
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

.modal iframe {
    width: 100%;
    height: 500px;
    border: none;
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--green);
    color: #000;
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2000;
    transition: opacity 0.3s, transform 0.3s;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}