:root {
    --bg-primary: #1c1c1e;
    --bg-secondary: #2c2c2e;
    --bg-tertiary: #3a3a3c;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --text-tertiary: #636366;
    --accent: #0a84ff;
    --accent-hover: #409cff;
    --success: #30d158;
    --warning: #ff9f0a;
    --error: #ff453a;
    --border: #38383a;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.tab {
    flex: 1;
    min-width: 100px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: none;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab:hover {
    background: var(--bg-tertiary);
}

.tab.active {
    background: var(--accent);
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

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

.card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.card h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"] {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.select-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    cursor: pointer;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn.secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn.danger {
    background: var(--error);
    color: white;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.info-box {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.info-box p {
    margin-bottom: 8px;
    word-break: break-all;
}

.info-box .warning {
    color: var(--warning);
}

.info-box .hint {
    color: var(--text-tertiary);
    font-size: 12px;
    margin-top: 12px;
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-area:hover {
    border-color: var(--accent);
    background: rgba(10, 132, 255, 0.05);
}

.upload-area.dragover {
    border-color: var(--accent);
    background: rgba(10, 132, 255, 0.1);
}

.upload-hint {
    color: var(--text-secondary);
}

.cards-grid {
    display: grid;
    gap: 12px;
}

.card-item {
    background: var(--bg-tertiary);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-item .card-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--bg-secondary);
}

.card-item .card-info {
    flex: 1;
}

.card-item .card-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.card-item .card-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

.card-item .card-actions {
    display: flex;
    gap: 8px;
}

.card-item .card-actions button {
    padding: 8px 12px;
    font-size: 13px;
}

.preview-content {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.character-preview {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-top: 12px;
}

.avatar-preview {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
}

.preview-text {
    flex: 1;
}

.preview-text p {
    margin-bottom: 4px;
    font-size: 14px;
}

.result-section {
    margin-bottom: 20px;
}

.result-section:last-child {
    margin-bottom: 0;
}

.result-section h3 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.code-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 12px;
}

.code-box code {
    flex: 1;
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 12px;
    word-break: break-all;
    color: var(--text-primary);
}

#qrcode {
    display: flex;
    justify-content: center;
    padding: 16px;
    background: white;
    border-radius: 8px;
    width: fit-content;
}

#qrcode canvas {
    display: block;
}

.logs-table-container {
    overflow-x: auto;
}

.logs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.logs-table th,
.logs-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.logs-table th {
    color: var(--text-secondary);
    font-weight: 500;
}

.logs-table td {
    color: var(--text-primary);
}

.status-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.status-badge.pending {
    background: rgba(255, 159, 10, 0.2);
    color: var(--warning);
}

.status-badge.confirmed {
    background: rgba(48, 209, 88, 0.2);
    color: var(--success);
}

.status-badge.expired {
    background: rgba(255, 69, 58, 0.2);
    color: var(--error);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--error);
}

.toast.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    .container {
        padding: 16px;
    }

    header h1 {
        font-size: 24px;
    }

    .tabs {
        gap: 4px;
    }

    .tab {
        padding: 10px 12px;
        font-size: 13px;
        min-width: 80px;
    }

    .card {
        padding: 16px;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
    }

    .logs-table th,
    .logs-table td {
        padding: 8px;
        font-size: 12px;
    }
}