/* 标易算 统一样式 v2.1 final
 * 蓝色品牌 + 移动端响应式 + 文章页 + 小微企业入口 + 404页
 */

:root {
    --primary: #0056b3;
    --primary-hover: #003d82;
    --primary-light: #e9f2fb;
    --accent: #007bff;
    --success: #28a745;
    --success-hover: #218838;
    --danger: #dc3545;
    --danger-hover: #c82333;
    --warning-bg: #fff3cd;
    --warning-text: #856404;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --border-strong: #cbd5e0;
    --bg: #f4f7f6;
    --bg-alt: #f9fafb;
    --bg-card: #ffffff;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

/* === 标题 === */
h1, h2, h3 { color: var(--primary); margin-top: 0; line-height: 1.3; }
h1 {
    text-align: center;
    font-size: 28px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}
h2 {
    font-size: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
    margin-bottom: 20px;
    margin-top: 0;
}
h3 { font-size: 17px; margin-bottom: 12px; }

/* === 导航 === */
nav {
    background-color: var(--primary);
    border-radius: var(--radius);
    padding: 8px 16px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}
nav ul {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 4px;
}
nav li { margin: 0; }
nav a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    font-size: 15px;
    padding: 8px 14px;
    border-radius: 6px;
    transition: background-color 0.15s;
    display: block;
}
nav a:hover { background-color: rgba(255, 255, 255, 0.15); }
nav a.active { background-color: var(--primary-hover); font-weight: 600; }

/* === 按钮 === */
button, .btn {
    padding: 10px 20px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    background-color: var(--primary);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.15s;
    font-family: inherit;
}
button:hover { background-color: var(--primary-hover); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-add { background-color: var(--success); }
.btn-add:hover { background-color: var(--success-hover); }
.btn-remove {
    background-color: transparent;
    color: var(--danger);
    padding: 6px 12px;
    font-size: 13px;
    border: 1px solid var(--danger);
    font-weight: 500;
}
.btn-remove:hover { background-color: var(--danger); color: white; }
.btn-secondary {
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border-strong);
}
.btn-secondary:hover { background-color: var(--border); }
.btn-calculate {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    margin-top: 20px;
}
.control-buttons {
    display: flex;
    gap: 12px;
    margin-top: 15px;
    flex-wrap: wrap;
}

/* === 表单 === */
.section { margin-bottom: 28px; }
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}
.input-group { display: flex; flex-direction: column; }
.input-group label {
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
}
.input-group input,
.input-group select {
    padding: 10px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 6px;
    font-size: 15px;
    width: 100%;
    font-family: inherit;
    background: white;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.input-group input:focus,
.input-group select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.15);
}
.label-deduct { color: var(--danger); font-weight: 700; }

/* === 供应商/竞品行 === */
.row-header,
.data-row {
    display: grid;
    grid-template-columns: 2.5fr 1fr 1fr 1fr auto;
    gap: 14px;
    align-items: end;
    margin-bottom: 12px;
}
.row-header {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
    margin-bottom: 14px;
    align-items: baseline;
}
.row-header > div { text-align: left; }

/* === 提示 === */
.info-banner {
    background-color: var(--primary-light);
    color: var(--primary);
    padding: 12px 16px;
    border-radius: var(--radius);
    margin: 0 0 24px;
    font-size: 14px;
    border-left: 3px solid var(--primary);
    line-height: 1.6;
}
.info-banner strong { color: var(--primary-hover); }
.error-msg {
    color: var(--danger);
    font-weight: 500;
    margin-top: 10px;
    font-size: 14px;
    min-height: 20px;
}

/* === 结果展示 === */
.results-wrapper { margin-top: 24px; }
.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    font-size: 14px;
}
.results-table th,
.results-table td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: center;
}
.results-table th {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
}
.results-table tr:nth-child(even) { background-color: var(--bg-alt); }
.winner-row {
    background-color: #d4edda !important;
    color: #155724;
    font-weight: 600;
}
.top-competitor-row {
    background-color: var(--warning-bg) !important;
    color: var(--warning-text);
    font-weight: 600;
}
.text-left { text-align: left !important; }

.final-result {
    background: linear-gradient(to right, var(--primary-light), #f0f7ff);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
}
.final-result h3 {
    margin: 0 0 8px;
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 500;
    border: none;
    padding: 0;
}
.final-result .price {
    font-size: 32px;
    font-weight: 700;
    color: var(--danger);
    margin: 8px 0;
    letter-spacing: -0.5px;
}
.final-result .context {
    font-size: 14px;
    color: var(--text);
    line-height: 1.6;
    margin: 0;
}

/* === 首页 === */
.hero-section { text-align: center; margin: 12px 0 28px; }
.hero-section h1 {
    font-size: 34px;
    margin-bottom: 10px;
    border: none;
    padding: 0;
}
.hero-section .tagline {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.6;
}

.tool-card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 24px;
}
.tool-card {
    background-color: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-decoration: none;
    color: inherit;
    transition: all 0.15s;
    display: block;
}
.tool-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.tool-card h3 {
    font-size: 18px;
    margin: 12px 0 8px;
    border: none;
    padding: 0;
}
.tool-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0;
}
.role-tag {
    display: inline-block;
    background-color: var(--success);
    color: white;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}
.tool-card.bidder .role-tag { background-color: var(--danger); }

/* === 小微企业功能入口(免费版升级触发器) === */
.sme-section { margin-bottom: 28px; }
.sme-section h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: space-between;
}
.sme-section h2 .pro-badge {
    display: inline-block;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #78350f;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    letter-spacing: 1px;
}
.sme-notice {
    background: linear-gradient(135deg, #fef3c7 0%, #fef9c3 100%);
    border: 1px solid #fbbf24;
    border-radius: 8px;
    padding: 16px 20px;
}
.sme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 600;
    color: #78350f;
    cursor: pointer;
    user-select: none;
}
.sme-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #f59e0b;
}
.sme-hint {
    font-size: 13px;
    color: #78350f;
    margin: 8px 0 0 28px;
    line-height: 1.7;
    opacity: 0.85;
}
.sme-hint strong { color: #78350f; font-weight: 700; }

/* === Pro 升级区块 === */
.pro-section {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-top: 36px;
}
.pro-section .pro-label {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 4px;
    letter-spacing: 1px;
    margin-bottom: 12px;
}
.pro-section h2 {
    border: none;
    padding: 0;
    font-size: 22px;
    margin-bottom: 8px;
}
.pro-section .sub {
    color: var(--text-muted);
    font-size: 15px;
    margin: 0 0 20px;
}
.pro-compare-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}
.pro-compare-table th,
.pro-compare-table td {
    border-bottom: 1px solid var(--border);
    padding: 12px;
    text-align: left;
}
.pro-compare-table th {
    background-color: var(--bg-alt);
    font-weight: 600;
    font-size: 14px;
}
.pro-compare-table .col-free {
    color: var(--text-muted);
    text-align: center;
    width: 28%;
}
.pro-compare-table .col-pro {
    color: var(--primary);
    font-weight: 600;
    text-align: center;
    width: 28%;
    background-color: var(--primary-light);
}
.pro-compare-table .check::before { content: "✓ "; color: var(--success); font-weight: bold; }
.pro-compare-table .cross::before { content: "— "; color: var(--text-muted); }


.pro-cta-row {
    display: flex;
    gap: 14px;
    align-items: center;
    margin-top: 20px;
    flex-wrap: wrap;
}
.pro-cta-primary {
    background-color: var(--primary);
    color: white;
    padding: 12px 26px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: background-color 0.15s;
    display: inline-block;
}
.pro-cta-primary:hover { background-color: var(--primary-hover); }
.pro-price-tag {
    font-size: 14px;
    color: var(--text-muted);
}
.pro-price-tag strong {
    color: var(--danger);
    font-size: 18px;
    font-weight: 700;
}

/* === 升级弹窗 === */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 16px;
}
.modal-backdrop.active { display: flex; }
.modal {
    background: white;
    border-radius: var(--radius-lg);
    max-width: 480px;
    width: 100%;
    padding: 28px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modal-in 0.2s ease-out;
}
@keyframes modal-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.modal h3 {
    margin: 0 0 12px;
    color: var(--primary);
    font-size: 20px;
    border: none;
    padding: 0;
}
.modal p {
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    margin: 0 0 16px;
}
.modal ul {
    padding-left: 20px;
    margin: 12px 0 20px;
    font-size: 14px;
    color: var(--text);
}
.modal ul li { margin-bottom: 6px; }
.modal-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}
.modal-actions > * {
    flex: 1;
    min-width: 140px;
    text-align: center;
    text-decoration: none;
}

/* === 内容页 === */
.content-section { font-size: 15px; line-height: 1.8; }
.content-section p,
.content-section ul { margin-bottom: 14px; }
.content-section li { margin-left: 18px; }
.content-section strong { color: var(--primary); }
.content-section code {
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'SFMono-Regular', Menlo, monospace;
}

/* === 联系页 === */
.contact-section {
    text-align: center;
    padding: 30px 0;
}
.contact-section p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.7;
}
.email-box {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-alt);
    padding: 14px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    flex-wrap: wrap;
    justify-content: center;
    max-width: 100%;
}
.email-box a {
    color: var(--primary);
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    font-family: 'SFMono-Regular', Menlo, monospace;
    word-break: break-all;
}
.email-box .copy-btn {
    padding: 6px 14px;
    font-size: 13px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.15s;
}
.email-box .copy-btn:hover { background: var(--primary-hover); }
.email-box .copy-btn.copied { background: var(--success); }

/* === Footer === */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
}
footer a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 8px;
}
footer a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.muted-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin: 6px 0 0;
}
.centered-sub {
    text-align: center;
    color: var(--text-muted);
    margin: -10px 0 24px;
    font-size: 14px;
}

/* === 文章页 === */
.article-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 28px 30px;
}
.article-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}
.article-title {
    font-size: 30px;
    line-height: 1.3;
    color: var(--text);
    margin: 0 0 14px;
    font-weight: 700;
    text-align: left;
    padding: 0;
    border: none;
}
.article-meta {
    display: flex;
    gap: 14px;
    font-size: 13px;
    color: var(--text-muted);
    flex-wrap: wrap;
    align-items: center;
}
.article-meta .tag {
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}
.article-body { font-size: 16px; line-height: 1.85; color: var(--text); }
.article-body h2 {
    font-size: 22px;
    margin: 36px 0 16px;
    padding: 0 0 8px;
    border-bottom: 2px solid var(--border);
    color: var(--primary);
}
.article-body h3 {
    font-size: 18px;
    margin: 28px 0 12px;
    color: var(--primary);
    border: none;
    padding: 0;
}
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol {
    margin: 0 0 16px;
    padding-left: 26px;
}
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--text); font-weight: 600; }
.article-body code {
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.92em;
    font-family: 'SFMono-Regular', Menlo, monospace;
    color: var(--primary);
}

.article-body .callout {
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    padding: 14px 18px;
    border-radius: 4px;
    margin: 20px 0;
    font-size: 15px;
}
.article-body .callout strong { color: var(--primary); }
.article-body .callout-warning {
    background: var(--warning-bg);
    border-left-color: var(--warning-text);
}
.article-body .callout-warning strong { color: var(--warning-text); }

.article-trust-box {
    background: #fbfcfe;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    margin: 22px 0 26px;
}
.article-trust-box h2 {
    border: none;
    padding: 0;
    margin: 0 0 10px;
    font-size: 18px;
    color: var(--text);
}
.article-trust-box ul {
    margin-bottom: 0;
    padding-left: 22px;
}
.article-trust-box a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-figure {
    margin: 24px 0 28px;
}
.article-figure img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: white;
}
.article-figure figcaption {
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.6;
    margin-top: 8px;
}

.formula-box {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 24px;
    margin: 20px 0;
    text-align: center;
    font-family: 'SFMono-Regular', Menlo, monospace;
    font-size: 16px;
    overflow-x: auto;
}

.tool-cta-inline {
    background: linear-gradient(135deg, #f0f7ff 0%, #e9f2fb 100%);
    border: 1px solid var(--primary-light);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin: 28px 0;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.tool-cta-inline .cta-text {
    flex: 1;
    min-width: 220px;
}
.tool-cta-inline .cta-text strong {
    display: block;
    font-size: 16px;
    margin-bottom: 4px;
    color: var(--primary);
}
.tool-cta-inline .cta-text span {
    font-size: 14px;
    color: var(--text-muted);
}
.tool-cta-inline a {
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
}
.tool-cta-inline a:hover { background: var(--primary-hover); }

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0;
    font-size: 14px;
}
.article-body table th,
.article-body table td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: left;
}
.article-body table th {
    background: var(--bg-alt);
    font-weight: 600;
    color: var(--text);
}
.article-body table tr:nth-child(even) { background: var(--bg-alt); }

.related-articles {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.related-articles h3 {
    font-size: 17px;
    color: var(--text);
    margin: 0 0 14px;
}
.related-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}
.related-list a {
    display: block;
    padding: 14px 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    transition: all 0.15s;
}
.related-list a:hover {
    border-color: var(--accent);
    background: var(--primary-light);
}

.articles-index {
    display: grid;
    gap: 16px;
    margin-top: 20px;
}
.article-card {
    padding: 20px 22px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: all 0.15s;
    display: block;
}
.article-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}
.article-card h3 {
    font-size: 17px;
    margin: 0 0 8px;
    color: var(--primary);
    border: none;
    padding: 0;
}
.article-card p {
    margin: 0 0 8px;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
}
.article-card .meta {
    font-size: 12px;
    color: var(--text-muted);
}
.article-card .meta .tag {
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 3px;
    margin-right: 8px;
    font-weight: 500;
}

.article-toc {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin: 0 0 28px;
}
.article-toc-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.article-toc ol {
    margin: 0;
    padding-left: 20px;
    font-size: 14px;
}
.article-toc a {
    color: var(--primary);
    text-decoration: none;
}
.article-toc a:hover { text-decoration: underline; }

/* === 404 === */
.error-page { text-align: center; padding: 40px 20px 20px; }
.error-code {
    font-size: 80px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin: 0 0 8px;
    letter-spacing: -2px;
}
.error-title {
    font-size: 22px;
    color: var(--text);
    margin: 0 0 12px;
    border: none;
    padding: 0;
}
.error-desc {
    color: var(--text-muted);
    font-size: 15px;
    max-width: 520px;
    margin: 0 auto 28px;
    line-height: 1.7;
}
.error-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    max-width: 820px;
    margin: 0 auto 28px;
}
.error-action-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    text-decoration: none;
    color: inherit;
    transition: all 0.15s;
    text-align: left;
}
.error-action-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.error-action-card .action-label {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}
.error-action-card.primary .action-label {
    background: var(--primary);
    color: white;
}
.error-action-card h3 {
    font-size: 16px;
    color: var(--primary);
    margin: 0 0 6px;
    border: none;
    padding: 0;
}
.error-action-card p {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}
.error-search-hint {
    max-width: 520px;
    margin: 0 auto;
    padding: 16px 20px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
}
.error-search-hint a {
    color: var(--primary);
    text-decoration: none;
}
.error-search-hint a:hover { text-decoration: underline; }

/* === 移动端 === */
@media (max-width: 768px) {
    body { padding: 10px; }
    .container { padding: 18px; border-radius: var(--radius); }
    h1 { font-size: 22px; }
    h2 { font-size: 17px; }
    nav { padding: 6px; }
    nav a { font-size: 14px; padding: 6px 10px; }

    .row-header { display: none; }
    .data-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        padding: 14px;
        background: var(--bg-alt);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        margin-bottom: 12px;
    }
    .data-row .input-group::before {
        content: attr(data-label);
        font-size: 12px;
        color: var(--text-muted);
        display: block;
        margin-bottom: 4px;
        font-weight: 500;
    }
    .data-row .input-group:first-child {
        grid-column: span 2;
    }
    .data-row .btn-remove {
        grid-column: span 2;
        justify-self: stretch;
    }

    .hero-section h1 { font-size: 26px; }
    .tool-card-container { grid-template-columns: 1fr; }

    .pro-section { padding: 20px; }
    .pro-compare-table { font-size: 13px; }
    .pro-compare-table th, .pro-compare-table td { padding: 10px 8px; }

    .final-result .price { font-size: 26px; }
    .results-table { font-size: 13px; }
    .results-table th, .results-table td { padding: 8px 6px; }

    .sme-section h2 {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
    .sme-hint { margin-left: 0; }

    .article-container { padding: 16px; }
    .article-title { font-size: 22px; }
    .article-body { font-size: 15px; line-height: 1.75; }
    .article-body h2 { font-size: 18px; margin-top: 28px; }
    .article-body h3 { font-size: 16px; }
    .tool-cta-inline { flex-direction: column; align-items: stretch; text-align: center; }
    .tool-cta-inline a { display: block; }
    .related-list { grid-template-columns: 1fr; }

    .error-code { font-size: 60px; }
    .error-title { font-size: 18px; }
    .error-actions { grid-template-columns: 1fr; }
}

/* === 打印 === */
@media print {
    nav, .pro-section, footer, .control-buttons,
    #calculate-btn, .info-banner, .modal-backdrop,
    .sme-section { display: none !important; }
    body { background: white; padding: 0; }
    .container { box-shadow: none; padding: 0; }
}