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

:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252540;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #3a3a5a;
    --success: #22c55e;
}

/* Light Mode */
body.light-mode {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8ed;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent: #5856d6;
    --accent-hover: #6e6cd8;
    --border: #d2d2d7;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.header-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
}

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

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    font-size: 1.125rem;
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

body.light-mode .theme-toggle .icon-sun {
    display: block;
}

body.light-mode .theme-toggle .icon-moon {
    display: none;
}

main {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* Editor Panel */
.editor-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.editor-panel section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.editor-panel h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-group input[type="checkbox"] + span,
.form-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
}

textarea {
    min-height: 100px;
    resize: vertical;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 4px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

input[type="color"]::-webkit-color-swatch {
    border-radius: 4px;
    border: none;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

input[type="range"] + span {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.button-group {
    display: flex;
    gap: 0.5rem;
}

.align-btn {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.align-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* Preset Section */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.625rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.preset-btn[data-preset="dark"] {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
}

.preset-btn[data-preset="light"] {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    color: #212529;
}

.preset-btn[data-preset="sunset"] {
    background: linear-gradient(135deg, #f97316, #ec4899);
}

.preset-btn[data-preset="ocean"] {
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
}

.preset-btn[data-preset="forest"] {
    background: linear-gradient(135deg, #059669, #14b8a6);
}

.preset-btn[data-preset="wine"] {
    background: linear-gradient(135deg, #7c2d12, #be185d);
}

/* Preview Panel */
.preview-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    position: sticky;
    top: 2rem;
}

.preview-panel h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.canvas-wrapper {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
    overflow: hidden;
}

#preview-canvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
}

.primary-btn,
.secondary-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.secondary-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

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

/* Footer */
footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 900px) {
    .preview-panel {
        position: static;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .header-top {
        gap: 0.75rem;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .editor-panel section {
        padding: 1rem;
    }

    .preview-panel {
        padding: 1rem;
    }

    .form-row {
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }

    .button-group {
        flex-wrap: wrap;
    }

    .align-btn {
        flex: 1 1 calc(50% - 0.25rem);
        min-width: 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.75rem;
    }

    header h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.875rem;
    }

    .editor-panel h2,
    .preview-panel h2 {
        font-size: 0.875rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .preset-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .action-buttons {
        flex-direction: column;
    }

    .primary-btn,
    .secondary-btn {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }

    .file-upload-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .file-upload-btn {
        text-align: center;
    }

    .file-name {
        text-align: center;
    }

    .modal-content {
        margin: 0.5rem;
        max-height: calc(100vh - 1rem);
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }

    .account-item {
        padding: 0.5rem;
    }

    .account-avatar {
        width: 32px;
        height: 32px;
    }

    .share-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
}

/* Share Section */
.share-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.share-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.accounts-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.account-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.account-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--bg-secondary);
}

.account-info {
    flex: 1;
    min-width: 0;
}

.account-name {
    font-weight: 500;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.account-instance {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.account-actions {
    display: flex;
    gap: 0.5rem;
}

.share-btn {
    padding: 0.5rem 1rem;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.share-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.remove-btn {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.remove-btn:hover {
    border-color: #ef4444;
    color: #ef4444;
}

.add-account-btn {
    width: 100%;
    padding: 0.75rem;
    background: transparent;
    border: 1px dashed var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.add-account-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.no-accounts {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 420px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.modal-footer {
    display: flex;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
}

.modal-footer .primary-btn,
.modal-footer .secondary-btn {
    flex: 1;
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.75rem;
    display: none;
}

.error-message.visible {
    display: block;
}

.success-message {
    color: var(--success);
    font-size: 0.875rem;
    margin-top: 0.75rem;
    display: none;
}

.success-message.visible {
    display: block;
}

/* Share Modal */
.share-account-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.share-account-info .account-avatar {
    width: 32px;
    height: 32px;
}

.share-account-info .account-name {
    font-size: 0.9375rem;
}

#share-text {
    min-height: 80px;
}

#share-alt-text {
    min-height: 60px;
}

.form-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* File Upload */
.file-upload-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.file-upload-wrapper input[type="file"] {
    display: none;
}

.file-upload-btn {
    padding: 0.625rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.file-upload-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.file-name {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.file-name.has-file {
    color: var(--accent);
}

/* Loading state */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    border-radius: inherit;
}

.primary-btn.loading,
.secondary-btn.loading {
    color: transparent;
}

.primary-btn.loading::before,
.secondary-btn.loading::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    left: 50%;
    top: 50%;
    margin-left: -10px;
    margin-top: -10px;
}

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