/* ========================================
   工具页面专用样式
   ======================================== */

/* Tab 导航 */
.tab-nav {
    display: flex;
    gap: 12px;
    margin: 40px 0 30px 0;
    padding: 8px;
    background: rgba(255,255,255,0.03);
    border-radius: 12px;
    border: 2px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: 16px 24px;
    background: transparent;
    border: 2px solid transparent;
    color: var(--text-muted);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    color: #fff;
}

.tab-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Tab 内容区 */
.tab-content {
    display: none;
    animation: fadeIn 0.3s;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

/* ========================================
   演示卡片样式
   ======================================== */

.demo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 24px;
}

@media (max-width: 1200px) {
    .demo-grid {
        grid-template-columns: 1fr;
    }
}

.demo-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
}

.demo-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
}

.demo-card.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.demo-card.disabled:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border);
}

.demo-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.demo-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.demo-title .icon {
    font-size: 24px;
}

.demo-title h3 {
    margin: 0;
    font-size: 18px;
    color: #fff;
}

.demo-btn {
    padding: 8px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

.demo-btn:hover {
    background: #2563eb;
    transform: translateY(-1px);
}

.demo-btn:disabled {
    background: #374151;
    cursor: not-allowed;
    transform: none;
}

.demo-body {
    padding: 24px;
}

/* ========================================
   源码卡片样式
   ======================================== */

.source-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 24px;
}

@media (max-width: 1200px) {
    .source-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

.source-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s;
}

.source-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.source-card .icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.source-card h3 {
    margin: 0 0 12px 0;
    font-size: 18px;
    color: #fff;
}

.source-card .desc {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
    min-height: 60px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.tech-tag {
    padding: 4px 10px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    border-radius: 4px;
    font-size: 12px;
}

.source-link {
    display: inline-block;
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

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

/* ========================================
   在线工具区样式
   ======================================== */

.login-prompt {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.login-prompt .icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.login-prompt h3 {
    margin: 0 0 12px 0;
    color: #fff;
}

.login-prompt p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.login-prompt button {
    padding: 12px 32px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 15px;
}

.login-prompt button:hover {
    background: #2563eb;
}

.online-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    margin-bottom: 24px;
}

.online-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.online-header:hover {
    background: rgba(255,255,255,0.02);
}

.online-body {
    padding: 24px;
    display: none;
}

.online-body.active {
    display: block;
}

/* ========================================
   PDF 工具样式
   ======================================== */

.pdf-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.pdf-tab {
    padding: 8px 16px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 13px;
    transition: all 0.2s;
}

.pdf-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

.pdf-panel {
    display: none;
}

.pdf-panel.active {
    display: block;
}

.pdf-form-row {
    margin-bottom: 16px;
}

.pdf-form-row label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.pdf-form-row input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    background: var(--bg-body);
    color: #aaa;
    cursor: pointer;
    font-size: 13px;
}

.pdf-form-row input[type="text"],
.pdf-form-row input[type="number"],
.pdf-form-row select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: #fff;
    font-size: 13px;
}

.pdf-info {
    margin-top: 8px;
    padding: 10px 12px;
    background: rgba(59,130,246,0.1);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: 6px;
    color: #93c5fd;
    font-size: 12px;
    display: none;
}

.pdf-btn {
    padding: 12px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
    margin-top: 8px;
}

.pdf-btn:hover {
    background: #2563eb;
}

.pdf-btn:disabled {
    background: #374151;
    color: #6b7280;
    cursor: not-allowed;
}

.pdf-result {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    display: none;
    font-size: 13px;
}

.pdf-result.ok {
    display: block;
    background: rgba(16,185,129,0.1);
    border: 1px solid rgba(16,185,129,0.3);
    color: #6ee7b7;
}

.pdf-result.err {
    display: block;
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.3);
    color: #fca5a5;
}

.pdf-dl {
    display: inline-block;
    margin-top: 12px;
    padding: 10px 20px;
    background: #10b981;
    color: #fff;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
}

.pdf-dl:hover {
    background: #059669;
}

/* ========================================
   认证相关样式
   ======================================== */

.auth-btn {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.auth-btn:hover {
    background: var(--primary);
    color: #fff;
}

.auth-btn.logged-in {
    background: #10b981;
    border-color: #10b981;
    color: #fff;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    width: 360px;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-close:hover {
    color: #fff;
}

.modal h3 {
    margin-bottom: 24px;
    color: #fff;
}

.modal input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    margin-bottom: 16px;
}

.modal input:focus {
    outline: none;
    border-color: var(--primary);
}

.modal button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
}

.modal button:hover {
    background: #2563eb;
}

.auth-switch {
    text-align: center;
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.auth-switch a {
    color: var(--primary);
    text-decoration: none;
}

/* ========================================
   动画效果
   ======================================== */

@keyframes scan {
    0% { top: 12px; opacity: 1; }
    50% { top: calc(100% - 14px); opacity: 0.8; }
    100% { top: 12px; opacity: 1; }
}

/* ========================================
   演示链接样式
   ======================================== */

.card-links {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.demo-link {
    flex: 1;
    text-align: center;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: transform 0.2s, opacity 0.2s;
}

.demo-link:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.source-link-wrapper {
    flex: 1;
}

.source-link-wrapper .source-link {
    display: block;
    text-align: center;
    padding: 8px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--primary);
    border-radius: 6px;
    transition: background 0.2s;
}

.source-link-wrapper .source-link:hover {
    background: rgba(59, 130, 246, 0.2);
    text-decoration: none;
}

/* ========================================
   Loading 动画
   ======================================== */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-dots {
    display: inline-flex;
    gap: 4px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.loading-pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading-shimmer {
    background: linear-gradient(90deg, 
        var(--bg-card) 0%, 
        rgba(59, 130, 246, 0.1) 50%, 
        var(--bg-card) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========================================
   通知提示样式
   ======================================== */

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    z-index: 2000;
    animation: slideIn 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.success {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.toast.error {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.toast.warning {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ========================================
   空状态提示
   ======================================== */

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

.empty-state .icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 14px;
    margin: 0;
}