/* 哎呀 AI 工具箱 - 全站样式 v4 (0815 兼容修复版) */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-soft: #dbeafe;
    --text: #1e293b;
    --text-muted: #64748b;
    --bg: #ffffff;
    --bg-soft: #f8fafc;
    --bg-warm: #fff7ed;
    --border: #e2e8f0;
    --radius-sm: 10px;
    --radius: 16px;
    --radius-lg: 24px;
    --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 10px 20px -4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 30px -8px rgba(0,0,0,0.1), 0 4px 10px -4px rgba(0,0,0,0.05);
    --max-width: 1180px;
}

*, *::before, *::after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--primary);
    text-decoration: none;
    -webkit-transition: color .2s;
    transition: color .2s;
}

a:hover { color: var(--primary-dark); }

img {
    max-width: 100%;
    height: auto;
    display: block;
    border: 0;
}

/* 容器 - 强制居中，兼容所有浏览器 */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 24px;
    padding-right: 24px;
    display: block;
    position: relative;
}

/* Header */
.site-header {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    background-color: rgba(255,255,255,0.95);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226,232,240,0.8);
}

.header-inner {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    height: 68px;
}

.logo {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--text);
}

.logo::before {
    content: "🧰";
    font-size: 1.4rem;
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: #2563eb;
    background: -webkit-linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    border-radius: 10px;
    color: #fff;
    -webkit-box-shadow: 0 4px 10px rgba(37,99,235,0.25);
    box-shadow: 0 4px 10px rgba(37,99,235,0.25);
}

.main-nav ul {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 8px;
    list-style: none !important;
    list-style-type: none !important;
    margin: 0;
    padding: 0;
}

.main-nav li {
    list-style: none !important;
    list-style-type: none !important;
    margin: 0;
    padding: 0;
}

.main-nav a {
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    -webkit-transition: all .2s;
    transition: all .2s;
    display: inline-block;
}

.main-nav a:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.main-nav a.active {
    color: var(--primary);
    background: var(--primary-soft);
    font-weight: 600;
}

.mobile-menu-toggle {
    display: none;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    padding: 8px;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.mobile-menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    -webkit-transition: .2s;
    transition: .2s;
}

@media (max-width: 768px) {
    .main-nav {
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 12px 20px 20px;
        display: none;
        -webkit-box-shadow: var(--shadow-lg);
        box-shadow: var(--shadow-lg);
    }
    .main-nav.open { display: block; }
    .main-nav ul {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
        gap: 4px;
    }
    .main-nav a { display: block; padding: 10px 14px; }
    .mobile-menu-toggle { display: -webkit-box; display: -webkit-flex; display: -ms-flexbox; display: flex; }
}

/* Buttons */
.btn {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    -webkit-transition: all .2s ease;
    transition: all .2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    -webkit-box-shadow: var(--shadow);
    box-shadow: var(--shadow);
    text-align: center;
}

.btn-primary {
    background: #2563eb;
    background: -webkit-linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    color: #fff;
}

.btn-primary:hover {
    -webkit-transform: translateY(-2px);
    -ms-transform: translateY(-2px);
    transform: translateY(-2px);
    -webkit-box-shadow: 0 8px 20px rgba(37,99,235,0.3);
    box-shadow: 0 8px 20px rgba(37,99,235,0.3);
    color: #fff;
}

.btn-secondary {
    background: #fff;
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.btn-arrow::after {
    content: "→";
    -webkit-transition: -webkit-transform .2s;
    transition: transform .2s;
}

.btn-arrow:hover::after {
    -webkit-transform: translateX(3px);
    -ms-transform: translateX(3px);
    transform: translateX(3px);
}

/* Hero */
.hero {
    padding: 90px 0 70px;
    background: #eff6ff;
    background: -webkit-linear-gradient(top, #eff6ff 0%, #f8fafc 60%, #ffffff 100%);
    background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 60%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -100px;
    right: -100px;
    width: 420px;
    height: 420px;
    background: -webkit-radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
    background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1.1fr 60px 0.9fr;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    position: relative;
}

.hero-badge {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 8px;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 3rem;
    line-height: 1.15;
    margin: 0 0 20px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero-text h1 .highlight {
    background: -webkit-linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--primary);
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin: 0 0 32px;
    max-width: 520px;
}

.hero-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 14px;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    margin-bottom: 28px;
}

.hero-stats {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 28px;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
}

.hero-stat {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-stat span {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: #dcfce7;
    border-radius: 50%;
    color: #16a34a;
    font-size: 0.8rem;
}

.hero-promo {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    position: relative;
}

.hero-promo::before {
    content: "";
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: -webkit-radial-gradient(circle, rgba(37,99,235,0.06) 0%, transparent 70%);
    background: radial-gradient(circle, rgba(37,99,235,0.06) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.hero-promo .promo-figure {
    position: relative;
    z-index: 1;
}

.hero-promo img {
    max-width: 240px;
    border-radius: var(--radius-lg);
    -webkit-box-shadow: var(--shadow-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

@media (max-width: 992px) {
    .hero { padding: 60px 0 50px; }
    .hero-inner {
        -ms-grid-columns: 1fr;
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    .hero-text h1 { font-size: 2.2rem; }
    .hero-text p { margin-left: auto; margin-right: auto; }
    .hero-actions { -webkit-box-pack: center; -webkit-justify-content: center; -ms-flex-pack: center; justify-content: center; }
    .hero-stats { -webkit-box-pack: center; -webkit-justify-content: center; -ms-flex-pack: center; justify-content: center; }
    .hero-promo img { max-width: 200px; }
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin: 0 0 14px;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.05rem;
    margin: 0 auto 48px;
    max-width: 640px;
}

@media (max-width: 768px) {
    .section { padding: 56px 0; }
    .section-title { font-size: 1.6rem; }
    .section-subtitle { font-size: 0.95rem; margin-bottom: 36px; }
}

/* Section header with icon */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-icon {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    font-size: 1.6rem;
    border-radius: var(--radius);
    margin-bottom: 16px;
    background: var(--primary-light);
    -webkit-box-shadow: var(--shadow);
    box-shadow: var(--shadow);
}

/* Tool grid */
.tool-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 24px 1fr 24px 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.tool-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    -webkit-transition: all .25s ease;
    transition: all .25s ease;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: -webkit-linear-gradient(left, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(90deg, var(--primary) 0%, #4f46e5 100%);
    opacity: 0;
    -webkit-transition: opacity .25s;
    transition: opacity .25s;
}

.tool-card:hover {
    -webkit-transform: translateY(-6px);
    -ms-transform: translateY(-6px);
    transform: translateY(-6px);
    -webkit-box-shadow: var(--shadow-lg);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-soft);
}

.tool-card:hover::before { opacity: 1; }

.tool-card a { color: inherit; display: block; }

.tool-icon {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    font-size: 1.7rem;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    background: var(--primary-light);
    -webkit-transition: -webkit-transform .25s;
    transition: transform .25s;
}

.tool-card:hover .tool-icon {
    -webkit-transform: scale(1.08) rotate(-3deg);
    -ms-transform: scale(1.08) rotate(-3deg);
    transform: scale(1.08) rotate(-3deg);
}

.tool-card h3 {
    margin: 0 0 10px;
    font-size: 1.15rem;
    color: var(--text);
    font-weight: 700;
}

.tool-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0 0 18px;
    line-height: 1.6;
}

.tool-link {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.tool-link::after {
    content: "→";
    -webkit-transition: -webkit-transform .2s;
    transition: transform .2s;
}

.tool-card:hover .tool-link::after {
    -webkit-transform: translateX(4px);
    -ms-transform: translateX(4px);
    transform: translateX(4px);
}

@media (max-width: 992px) {
    .tool-grid { -ms-grid-columns: 1fr 24px 1fr; grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 576px) {
    .tool-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
    .tool-card { padding: 24px; }
}

/* Blog grid */
.blog-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 24px 1fr 24px 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.blog-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    -webkit-transition: all .25s ease;
    transition: all .25s ease;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.blog-card:hover {
    -webkit-transform: translateY(-5px);
    -ms-transform: translateY(-5px);
    transform: translateY(-5px);
    -webkit-box-shadow: var(--shadow-lg);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-soft);
}

.blog-card-banner {
    height: 130px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-size: 2.6rem;
    background: -webkit-linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
    background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
}

.blog-card-body {
    padding: 22px;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.blog-card a { color: inherit; display: block; -webkit-box-flex: 1; -webkit-flex: 1; -ms-flex: 1; flex: 1; }

.blog-card h3 {
    margin: 0 0 12px;
    font-size: 1.05rem;
    line-height: 1.45;
    font-weight: 700;
    color: var(--text);
}

.blog-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0 0 16px;
    line-height: 1.55;
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

.blog-card-meta {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: auto;
}

.blog-card-link {
    color: var(--primary);
    font-weight: 600;
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 4px;
}

.blog-card-link::after {
    content: "→";
    -webkit-transition: -webkit-transform .2s;
    transition: transform .2s;
}

.blog-card:hover .blog-card-link::after {
    -webkit-transform: translateX(3px);
    -ms-transform: translateX(3px);
    transform: translateX(3px);
}

@media (max-width: 992px) {
    .blog-grid { -ms-grid-columns: 1fr 24px 1fr; grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 576px) {
    .blog-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
}

/* Features */
.feature-section {
    background: var(--bg-soft);
}

.feature-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 24px 1fr 24px 1fr 24px 1fr;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.feature-card {
    text-align: center;
    padding: 32px 24px;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    -webkit-transition: all .25s;
    transition: all .25s;
}

.feature-card:hover {
    -webkit-transform: translateY(-5px);
    -ms-transform: translateY(-5px);
    transform: translateY(-5px);
    -webkit-box-shadow: var(--shadow-md);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-soft);
}

.feature-icon {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    font-size: 2rem;
    border-radius: var(--radius);
    margin-bottom: 18px;
    background: var(--primary-light);
    -webkit-transition: -webkit-transform .25s;
    transition: transform .25s;
}

.feature-card:hover .feature-icon {
    -webkit-transform: scale(1.1) rotate(-4deg);
    -ms-transform: scale(1.1) rotate(-4deg);
    transform: scale(1.1) rotate(-4deg);
}

.feature-card h3 { margin: 0 0 10px; font-size: 1.1rem; font-weight: 700; }
.feature-card p { color: var(--text-muted); font-size: 0.95rem; margin: 0; line-height: 1.6; }

@media (max-width: 992px) {
    .feature-grid { -ms-grid-columns: 1fr 24px 1fr; grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 576px) {
    .feature-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
}

/* CTA */
.cta-section {
    background: #2563eb;
    background: -webkit-linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: "";
    position: absolute;
    top: -60px;
    left: -60px;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
}

.cta-section::after {
    content: "";
    position: absolute;
    bottom: -80px;
    right: -80px;
    width: 260px;
    height: 260px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
}

.cta-section .container { position: relative; z-index: 1; }

.cta-section h2 { margin: 0 0 12px; font-size: 1.9rem; }
.cta-section p { margin: 0 0 16px; opacity: 0.95; }
.cta-section a { color: #fff; text-decoration: underline; }

.cta-buttons {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: 14px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    margin-top: 24px;
}

.cta-section .btn-primary {
    background: #fff;
    color: var(--primary);
}
.cta-section .btn-primary:hover {
    background: #f8fafc;
    color: var(--primary-dark);
}

.cta-section .btn-secondary {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border-color: rgba(255,255,255,0.3);
}
.cta-section .btn-secondary:hover {
    background: rgba(255,255,255,0.25);
    color: #fff;
}

/* AdSense slots */
.ad-slot {
    margin: 40px auto;
    text-align: center;
    min-height: 100px;
    max-width: var(--max-width);
    padding-left: 24px;
    padding-right: 24px;
}

.ad-slot ins.adsbygoogle {
    display: block;
    margin: 0 auto;
}

/* Page header */
.page-header {
    padding: 70px 0 50px;
    background: #eff6ff;
    background: -webkit-linear-gradient(top, #eff6ff 0%, #f8fafc 100%);
    background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 2.2rem;
    margin: 0 0 14px;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.page-header p {
    color: var(--text-muted);
    margin: 0 auto;
    font-size: 1.1rem;
    max-width: 640px;
}

@media (max-width: 768px) {
    .page-header { padding: 50px 0 36px; }
    .page-header h1 { font-size: 1.7rem; }
}

/* Page with sidebar */
.page-with-sidebar {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 48px 300px;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    padding: 56px 0 90px;
    -webkit-box-align: start;
    -webkit-align-items: start;
    -ms-flex-align: start;
    align-items: start;
}

.main-article { min-width: 0; }

.sidebar {
    background: var(--bg-soft);
    border-radius: var(--radius);
    padding: 24px;
    position: -webkit-sticky;
    position: sticky;
    top: 88px;
    border: 1px solid var(--border);
}

.sidebar h3 {
    margin: 0 0 18px;
    font-size: 1.05rem;
    font-weight: 700;
}

.tool-list {
    list-style: none !important;
    list-style-type: none !important;
    margin: 0;
    padding: 0;
}

.tool-list li { margin-bottom: 6px; list-style: none !important; }
.tool-list a {
    color: var(--text);
    font-size: 0.95rem;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    -webkit-transition: all .2s;
    transition: all .2s;
}
.tool-list a:hover,
.tool-list a.active {
    color: var(--primary);
    background: #fff;
    -webkit-box-shadow: var(--shadow);
    box-shadow: var(--shadow);
}

.tool-list-icon {
    font-size: 1.1rem;
}

@media (max-width: 992px) {
    .page-with-sidebar { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
    .sidebar { position: static; }
}

/* Article body */
.article-body {
    font-size: 1.05rem;
    color: var(--text);
}

.article-body h2 {
    font-size: 1.55rem;
    margin: 40px 0 16px;
    font-weight: 700;
}

.article-body h3 {
    font-size: 1.25rem;
    margin: 28px 0 12px;
    font-weight: 700;
}

.article-body p {
    margin: 0 0 18px;
    color: var(--text);
    line-height: 1.8;
}

.article-body ul,
.article-body ol {
    margin: 0 0 24px;
    padding-left: 24px;
}

.article-body li { margin-bottom: 10px; }

.tool-cta {
    margin: 28px 0 36px;
}

.tool-cta .btn {
    padding: 16px 32px;
    font-size: 1.05rem;
}

/* Related section */
.related-section {
    margin: 48px 0;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.related-section h2 {
    font-size: 1.35rem;
    margin: 0 0 20px;
    font-weight: 700;
}

.related-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 16px 1fr 16px 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.related-card {
    background: var(--bg-soft);
    border-radius: var(--radius-sm);
    padding: 18px;
    border: 1px solid var(--border);
    -webkit-transition: all .2s;
    transition: all .2s;
}

.related-card:hover {
    background: #fff;
    -webkit-box-shadow: var(--shadow-md);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-soft);
}

.related-card a { color: var(--text); font-size: 1rem; font-weight: 600; }
.related-card p { color: var(--text-muted); font-size: 0.85rem; margin: 8px 0 0; line-height: 1.5; }

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

/* Promo sections - 现在由 .container 控制宽度 */
.promo-section,
.wechat-promo {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 0;
    margin: 48px 0;
    -webkit-box-shadow: var(--shadow-md);
    box-shadow: var(--shadow-md);
}

.promo-section {
    background: #fff;
    background: -webkit-linear-gradient(top, #fff 0%, #f8fafc 100%);
    background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
}

.promo-section > .container,
.wechat-promo > .container {
    text-align: center;
}

.promo-section h2,
.wechat-promo h3 {
    text-align: center;
    margin: 0 0 12px;
    font-size: 1.6rem;
    font-weight: 700;
}

.wechat-promo h3 { font-size: 1.4rem; }

.promo-desc {
    text-align: center;
    color: var(--text-muted);
    margin: 0 auto 32px;
    max-width: 620px;
    font-size: 1.05rem;
}

.promo-grid,
.wechat-grid,
.matrix-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 28px 1fr 28px 1fr 28px 1fr;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: start;
    -webkit-align-items: start;
    -ms-flex-align: start;
    align-items: start;
}

.wechat-grid { -ms-grid-columns: 1fr 28px 1fr; grid-template-columns: repeat(2, 1fr); max-width: 520px; margin: 0 auto; }
.matrix-grid { -ms-grid-columns: 1fr 28px 1fr 28px 1fr 28px 1fr; grid-template-columns: repeat(4, 1fr); }

.promo-figure {
    margin: 0;
    text-align: center;
    display: inline-block;
    vertical-align: top;
}

.promo-figure img {
    width: 170px;
    height: 170px;
    -o-object-fit: contain;
    object-fit: contain;
    border-radius: var(--radius);
    -webkit-box-shadow: var(--shadow-md);
    box-shadow: var(--shadow-md);
    background: #fff;
    padding: 8px;
    border: 1px solid var(--border);
    -webkit-transition: -webkit-transform .25s, -webkit-box-shadow .25s;
    transition: transform .25s, box-shadow .25s;
    margin: 0 auto;
}

.promo-figure:hover img {
    -webkit-transform: translateY(-5px);
    -ms-transform: translateY(-5px);
    transform: translateY(-5px);
    -webkit-box-shadow: var(--shadow-lg);
    box-shadow: var(--shadow-lg);
}

.promo-figure figcaption {
    margin-top: 12px;
    font-size: 0.95rem;
    color: var(--text);
    font-weight: 600;
}

.promo-figure .figsub {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.wechat-promo p {
    text-align: center;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 24px;
    font-size: 1rem;
}

.wechat-id {
    margin-top: 28px !important;
    font-size: 0.95rem;
    text-align: center;
    color: var(--text-muted);
}

.wechat-id a { font-weight: 500; }

@media (max-width: 992px) {
    .promo-grid,
    .matrix-grid { -ms-grid-columns: 1fr 28px 1fr; grid-template-columns: repeat(2, 1fr); }
    .promo-section,
    .wechat-promo { padding: 36px 0; }
}

@media (max-width: 576px) {
    .promo-grid,
    .wechat-grid,
    .matrix-grid { -ms-grid-columns: 1fr; grid-template-columns: 1fr; }
    .promo-figure img { width: 200px; height: 200px; }
}

/* Policy pages */
.policy-section {
    padding: 56px 0 90px;
}

.policy-section .article-body h2 {
    font-size: 1.35rem;
    margin-top: 36px;
}

/* Footer - 强制居中 */
.site-footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 56px 0 28px;
    text-align: center !important;
}

.site-footer .container {
    text-align: center !important;
    margin-left: auto !important;
    margin-right: auto !important;
}

.footer-brand {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.25rem;
    color: #fff;
    margin: 0 auto 20px auto;
    text-align: center;
}

.footer-brand::before {
    content: "🧰";
    font-size: 1.2rem;
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: #2563eb;
    background: -webkit-linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
    border-radius: 8px;
}

.footer-nav {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: 10px 20px;
    margin: 0 auto 20px auto;
    max-width: 800px;
}

.footer-nav a {
    color: #e2e8f0;
    font-size: 0.95rem;
    padding: 4px 8px;
    border-radius: 6px;
    -webkit-transition: all .2s;
    transition: all .2s;
}

.footer-nav a:hover { color: #fff; background: rgba(255,255,255,0.08); }

.footer-contact,
.footer-beian,
.footer-copy {
    font-size: 0.9rem;
    color: #94a3b8;
    margin: 0 auto 10px auto;
    line-height: 1.8;
    text-align: center;
    max-width: 900px;
}

.footer-contact p,
.footer-beian p,
.footer-copy p {
    margin: 0 auto;
    text-align: center;
}

.footer-contact a,
.footer-beian a {
    color: #94a3b8;
    text-decoration: underline;
}

.footer-contact a:hover,
.footer-beian a:hover { color: #fff; }

.footer-copy {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #1e293b;
    color: #64748b;
}

@media (max-width: 576px) {
    .footer-nav { gap: 8px 12px; }
    .footer-beian { font-size: 0.78rem; }
    .site-footer { padding: 40px 0 24px; }
}

/* Utility */
.text-center { text-align: center !important; }
.mt-4 { margin-top: 32px; }

/* Animation */
@-webkit-keyframes fadeInUp {
    from { opacity: 0; -webkit-transform: translateY(20px); transform: translateY(20px); }
    to { opacity: 1; -webkit-transform: translateY(0); transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; -webkit-transform: translateY(20px); transform: translateY(20px); }
    to { opacity: 1; -webkit-transform: translateY(0); transform: translateY(0); }
}

.tool-card,
.blog-card,
.feature-card {
    -webkit-animation: fadeInUp 0.5s ease forwards;
    animation: fadeInUp 0.5s ease forwards;
}