/* ========================================
   云图 - AI Image Generator
   克制极简风格（Restrained Minimal）
   设计原则：让界面消失，让图片说话
   ======================================== */

:root {
    /* 背景 - 纯净深黑 */
    --bg-base: #0A0A0A;
    --bg-elevated: #141414;
    --bg-hover: #1A1A1A;

    /* 文字 - 清晰层级 */
    --text-primary: #FAFAFA;
    --text-secondary: #888888;
    --text-tertiary: #555555;

    /* 强调色 - 只用一个 */
    --accent: #6366F1;
    --accent-hover: #818CF8;

    /* 边框 - 微妙存在 */
    --border: #222222;
    --border-hover: #333333;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* 过渡 - 快速响应 */
    --transition: 120ms ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

/* ========================================
   Layout
   ======================================== */
.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header - 极简
   ======================================== */
.brand {
    padding: 24px;
    text-align: center;
}

.brand-name {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
}

/* ========================================
   Preview Area - 图片是主角
   ======================================== */
.preview-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 24px 24px;
}

.preview-container {
    width: 100%;
    max-width: 960px;
    min-height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

/* Empty State - 低调提示 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 48px;
}

.empty-icon {
    color: var(--text-tertiary);
    opacity: 0.5;
}

.empty-title {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.empty-desc {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 48px;
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.loading-progress {
    width: 160px;
    height: 2px;
    background: var(--border);
    border-radius: 1px;
    overflow: hidden;
}

.loading-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.3s;
}

/* Result Grid - 智能自适应 */
.result-grid {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 16px;
    justify-content: center;
    align-items: center;
}

/* 单图：完整显示，自适应比例 */
.result-grid.grid-1 {
    padding: 24px;
}

.result-grid.grid-1 .result-item {
    max-width: 100%;
    max-height: calc(100vh - 300px);
}

.result-grid.grid-1 .result-item img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: calc(100vh - 300px);
    object-fit: contain;
}

/* 多图：网格布局，保持比例 */
.result-grid.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    max-width: 800px;
}

.result-grid.grid-4 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    max-width: 800px;
}

.result-grid.grid-2 .result-item,
.result-grid.grid-4 .result-item {
    aspect-ratio: var(--img-ratio, 3/4);
    background: var(--bg-base);
}

.result-grid.grid-2 .result-item img,
.result-grid.grid-4 .result-item img {
    object-fit: contain;
    background: var(--bg-base);
}

.result-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    background: var(--bg-base);
}

.result-item:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.result-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.result-actions {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    display: flex;
    justify-content: flex-end;
    opacity: 0;
    transition: opacity var(--transition);
}

.result-item:hover .result-actions {
    opacity: 1;
}

.result-action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    cursor: pointer;
    transition: background var(--transition);
}

.result-action-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* ========================================
   Input Card - 简洁输入
   ======================================== */
.input-card {
    padding: 0 24px 32px;
    display: flex;
    justify-content: center;
}

.input-card-inner {
    width: 100%;
    max-width: 720px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
}

.input-row {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.prompt-input {
    flex: 1;
    min-height: 24px;
    max-height: 120px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    line-height: 1.5;
    resize: none;
    outline: none;
}

.prompt-input::placeholder {
    color: var(--text-tertiary);
}

.input-actions {
    display: flex;
    gap: 4px;
}

.action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color var(--transition);
}

.action-btn:hover {
    color: var(--text-secondary);
}

.input-divider {
    height: 1px;
    background: var(--border);
    margin: 14px 0;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* Ratio Buttons - 朴素 */
.ratio-group {
    display: flex;
    gap: 4px;
}

.ratio-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition);
}

.ratio-btn:hover {
    color: var(--text-secondary);
}

.ratio-btn.active {
    background: var(--bg-hover);
    border-color: var(--border);
    color: var(--text-primary);
}

.ratio-icon {
    background: currentColor;
    opacity: 0.6;
}

.ratio-icon.square { width: 12px; height: 12px; }
.ratio-icon.wide { width: 16px; height: 9px; }
.ratio-icon.tall { width: 9px; height: 16px; }
.ratio-icon.landscape { width: 14px; height: 10px; }
.ratio-icon.portrait { width: 10px; height: 14px; }

.ratio-label {
    font-size: 0.6875rem;
    font-weight: 500;
}

/* Count Buttons */
.count-group {
    display: flex;
    gap: 4px;
    margin-left: auto;
}

.count-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 50%;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.count-btn:hover {
    color: var(--text-secondary);
}

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

/* Generate Button - 唯一强调色 */
.generate-btn {
    padding: 0 24px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
}

.generate-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

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

.generate-btn .spin {
    animation: spin 1s linear infinite;
}

/* ========================================
   Modal - 干净
   ======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    transition: opacity 150ms;
    padding: 24px;
}

.modal-overlay.visible {
    opacity: 1;
}

.modal {
    width: 100%;
    max-width: 400px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transform: scale(0.96);
    transition: transform 150ms;
}

.modal-overlay.visible .modal {
    transform: scale(1);
}

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

.modal-title {
    font-size: 0.9375rem;
    font-weight: 500;
}

.modal-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color var(--transition);
}

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

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 16px 20px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    border-top: 1px solid var(--border);
}

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

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

.form-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.form-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.75rem;
}

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

.form-input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: border-color var(--transition);
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

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

.input-with-icon {
    position: relative;
}

.input-with-icon .form-input {
    padding-right: 40px;
}

.input-icon-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
}

.input-icon-btn:hover {
    color: var(--text-secondary);
}

.form-hint {
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

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

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

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

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

/* ========================================
   Drawer - 简洁
   ======================================== */
.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 100;
    opacity: 0;
    transition: opacity 200ms;
}

.drawer-overlay.visible {
    opacity: 1;
}

.history-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 340px;
    max-width: 100%;
    background: var(--bg-elevated);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 200ms;
    z-index: 101;
    display: flex;
    flex-direction: column;
}

.history-drawer.open {
    transform: translateX(0);
}

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

.drawer-title {
    font-size: 0.875rem;
    font-weight: 500;
}

.drawer-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
}

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

.drawer-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.history-empty {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 0.8125rem;
}

.history-item {
    padding: 12px;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    cursor: pointer;
    transition: border-color var(--transition);
}

.history-item:hover {
    border-color: var(--border-hover);
}

.history-images {
    display: grid;
    gap: 4px;
    margin-bottom: 10px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.history-images.grid-1 { grid-template-columns: 1fr; }
.history-images.grid-2 { grid-template-columns: repeat(2, 1fr); }
.history-images.grid-4 { grid-template-columns: repeat(2, 1fr); }

.history-images img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.history-prompt {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 6px;
}

.history-meta {
    font-size: 0.6875rem;
    color: var(--text-tertiary);
}

/* ========================================
   Viewer
   ======================================== */
.viewer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    transition: opacity 150ms;
}

.viewer-overlay.visible {
    opacity: 1;
}

.viewer-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.viewer-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.viewer-actions {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    gap: 8px;
}

.viewer-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    cursor: pointer;
    transition: background var(--transition);
}

.viewer-btn:hover {
    background: rgba(255,255,255,0.2);
}

/* ========================================
   Utilities
   ======================================== */
.hidden {
    display: none !important;
}

.link-btn {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: inherit;
    padding: 0;
    text-decoration: underline;
}

/* Scrollbar - 几乎不可见 */
::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 640px) {
    .brand {
        padding: 20px 16px;
    }

    .preview-area {
        padding: 0 16px 20px;
    }

    .preview-container {
        min-height: 40vh;
    }

    .input-card {
        padding: 0 16px 24px;
    }

    .input-card-inner {
        padding: 14px 16px;
    }

    .control-row {
        gap: 8px;
    }

    .ratio-group {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    .ratio-btn {
        flex-shrink: 0;
        padding: 6px 10px;
    }

    .count-group {
        margin-left: 0;
    }

    .generate-btn {
        padding: 0 16px;
        height: 34px;
    }

    .history-drawer {
        width: 100%;
    }
}