/* SignFlow 组件层 | 按钮 / 卡片 / 徽章 / 进度条 / 上传 / 弹窗 / Toast /
   Spinner / 骨架屏 / 空状态 / 成功页
   依赖：tokens.css → base.css */
/* === 按钮 === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    font-family: inherit;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: white;
    box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-primary:active {
    transform: translateY(0);
}
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--accent);
}
.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}
.btn-success {
    background: var(--success);
    color: white;
}
.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}
.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* === 卡片 === */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
}
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

/* === 文档卡片网格 === */
.doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}
.doc-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    overflow: hidden;
    position: relative;
}
.doc-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-light);
}
.doc-card-header {
    padding: 20px 20px 12px;
}
.doc-card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-glow), var(--info-veil));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 12px;
}
.doc-card-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.doc-card-meta {
    font-size: 13px;
    color: var(--text-tertiary);
}
.doc-card-body {
    padding: 0 20px 16px;
}
.doc-card-stats {
    display: flex;
    gap: 16px;
    margin-top: 12px;
}
.doc-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}
.doc-stat-value {
    font-weight: 700;
    color: var(--text-primary);
}
.doc-card-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-tertiary);
}

/* 状态徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-draft { background: var(--badge-draft-bg); color: var(--badge-draft-fg); }
.badge-published { background: var(--accent-glow); color: var(--accent); }
.badge-completed { background: var(--badge-success-bg); color: var(--success); }
.badge-signed { background: var(--badge-success-bg); color: var(--success); }
.badge-pending { background: var(--badge-warning-bg); color: var(--warning); }
.badge-viewed { background: var(--badge-info-bg); color: var(--info); }

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 8px;
}
.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 3px;
    transition: width 0.5s ease;
}

/* === 上传区域 === */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    transition: all var(--transition);
    cursor: pointer;
    background: var(--bg-secondary);
}
.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
    transform: scale(1.01);
}
.upload-icon {
    font-size: 56px;
    margin-bottom: 16px;
}
.upload-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}
.upload-hint {
    color: var(--text-secondary);
    font-size: 14px;
}

/* === 签名弹窗 === */
.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 600px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 签名弹窗 - 更大的内容区域 */
.sig-modal-content {
    max-width: 760px !important;
    width: 92% !important;
}
.modal-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
}
.signature-pad-wrapper {
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: white;
    margin-bottom: 16px;
    position: relative;
    width: 100%;
    height: 340px;
}
#sig-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}
#signature-canvas {
    display: block;
    width: 100%;
    cursor: crosshair;
}
.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* === Toast 通知 === */
.toast-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    font-size: 14px;
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 400px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--info); }
.toast-warning { background: var(--warning); }

/* === 动画 === */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 加载动画 */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 20px auto;
}
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--scrim-soft);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    flex-direction: column;
    gap: 16px;
}
.loading-overlay .spinner {
    width: 56px;
    height: 56px;
    border-width: 4px;
}
/* 按钮内小号 spinner（lib/api.js 的 guard() 使用）：跟随按钮文字色，不写死颜色 */
.btn .spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
    margin: 0;
    border-color: currentColor;
    border-top-color: transparent;
    opacity: 0.75;
}
.btn.is-loading {
    cursor: progress;
}
.loading-text {
    color: white;
    font-size: 16px;
    font-weight: 600;
}

/* === 空状态 === */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}
.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.3;
}
.empty-state-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}
.empty-state-text {
    color: var(--text-secondary);
    font-size: 15px;
}

/* === 签署页面移动端适配 === */
.signing-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 20px;
    width: 100%;
}

/* 签署页PDF页面：margin:0 auto实现"适配时居中，溢出时左对齐可滚动" */
#pdf-area .pdf-page-wrapper {
    margin: 0 auto 24px;
}

/* 成功页面 */
.success-page {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 999;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 24px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
.success-card {
    text-align: center;
    max-width: 400px;
    width: 100%;
    margin: auto;
    padding: 24px 0;
}
.success-icon {
    margin-bottom: 24px;
    animation: scaleIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.success-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.success-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.success-hint {
    font-size: 14px;
    color: var(--text-tertiary);
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* 退出引导 */
.success-exit-guide {
    margin-top: 24px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}
.exit-guide-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* === 骨架屏（ui/skeleton.js 使用） === */
.sf-skeleton {
    position: relative;
    overflow: hidden;
    background: var(--bg-tertiary);
    border-radius: var(--radius-xs);
}
.sf-skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, var(--bg-glass-border), transparent);
    animation: sf-shimmer 1.4s infinite;
}
.sf-skeleton--text { height: 1em; margin-bottom: var(--space-2); }
.sf-skeleton--title { height: var(--fs-xl); width: 45%; }
.sf-skeleton--avatar { width: 40px; height: 40px; border-radius: 50%; }
.sf-skeleton--card { height: 120px; border-radius: var(--radius-md); }
@keyframes sf-shimmer {
    100% { transform: translateX(100%); }
}