/* =====================================================
   Xournal++ 官方推广网站 - 主样式表
   配色基于官方Logo：橙色系(#ff7800) + 炭灰(#3d3846) + 纸张白(#f5f4f3)
   风格：扁平 / 现代 / 专业
   ===================================================== */

/* ===== 设计变量 ===== */
:root {
    /* 品牌色 - 源自 Logo */
    --color-primary: #ff7800;
    --color-primary-dark: #e66100;
    --color-primary-light: #ffbe6f;
    --color-accent: #f6d32d;
    --color-accent-dark: #e5a50a;

    /* 中性色 */
    --color-text: #3d3846;
    --color-text-muted: #77767b;
    --color-text-light: #c0bfbc;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f4f3;
    --color-bg-dark: #3d3846;
    --color-border: #deddda;
    --color-white: #ffffff;

    /* 功能色 */
    --color-success: #2ec27e;
    --color-info: #3584e4;
    --color-danger: #e01b24;

    /* 排版 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑",
                 "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;

    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(61, 56, 70, 0.06), 0 1px 2px rgba(61, 56, 70, 0.04);
    --shadow-md: 0 4px 12px rgba(61, 56, 70, 0.08), 0 2px 4px rgba(61, 56, 70, 0.04);
    --shadow-lg: 0 12px 32px rgba(61, 56, 70, 0.12), 0 4px 8px rgba(61, 56, 70, 0.06);
    --shadow-xl: 0 24px 56px rgba(61, 56, 70, 0.16), 0 8px 16px rgba(61, 56, 70, 0.08);

    /* 过渡 */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

    /* 布局 */
    --container-max: 1200px;
    --header-height: 72px;
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

img, svg, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary-dark);
    text-decoration: none;
    transition: var(--transition);
}

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===== 容器 ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container-sm {
    max-width: 800px;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p { margin-bottom: var(--space-sm); }

.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-dark) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
    line-height: 1.2;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: 0 4px 12px rgba(255, 120, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 120, 0, 0.4);
    color: var(--color-white);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-lg {
    padding: 1.125rem 2.25rem;
    font-size: 1.125rem;
}

.btn-block { width: 100%; }

/* ===== 顶部导航 ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
	padding-top: 15px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.nav-brand img {
    width: 36px;
    height: 36px;
}

.nav-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.nav-brand-text small {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-menu a {
    padding: 0.5rem 1rem;
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
    background: rgba(255, 120, 0, 0.08);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-actions .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    padding: calc(var(--header-height) + var(--space-2xl)) 0 var(--space-2xl);
    background:
        radial-gradient(circle at 80% 20%, rgba(255, 120, 0, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 20% 80%, rgba(246, 211, 45, 0.10) 0%, transparent 50%),
        linear-gradient(180deg, #fafaf9 0%, #ffffff 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(192, 191, 188, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(192, 191, 188, 0.15) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content .badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.875rem;
    background: rgba(255, 120, 0, 0.1);
    color: var(--color-primary-dark);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.hero-content h1 {
    margin-bottom: var(--space-md);
}

.hero-content .lead {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    max-width: 540px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.hero-stat .num {
    font-size: 1.875rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.hero-stat .label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.hero-visual {
    position: relative;
}

.hero-mockup {
    position: relative;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: rotate(-1deg);
    transition: var(--transition);
}

.hero-mockup:hover {
    transform: rotate(0deg) translateY(-4px);
}

.hero-mockup-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.hero-mockup-header .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.hero-mockup-header .dot:nth-child(1) { background: #ff5f56; }
.hero-mockup-header .dot:nth-child(2) { background: #ffbd2e; }
.hero-mockup-header .dot:nth-child(3) { background: #27c93f; }

.hero-mockup-body {
    padding: 1.5rem;
    background:
        linear-gradient(rgba(192, 191, 188, 0.2) 1px, transparent 1px);
    background-size: 100% 28px;
    min-height: 380px;
    position: relative;
}

.hero-mockup-body svg.doodle {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* ===== 通用区块 ===== */
.section {
    padding: var(--space-2xl) 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-dark {
    background: var(--color-bg-dark);
    color: var(--color-white);
}

.section-dark h2,
.section-dark h3 {
    color: var(--color-white);
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--space-xl);
}

.section-header .eyebrow {
    display: inline-block;
    padding: 0.25rem 0.875rem;
    background: rgba(255, 120, 0, 0.1);
    color: var(--color-primary-dark);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.section-header h2 {
    margin-bottom: var(--space-sm);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* ===== 功能卡片网格 ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(255, 120, 0, 0.12), rgba(246, 211, 45, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    margin-bottom: var(--space-xs);
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--color-text-muted);
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* ===== 使用场景 ===== */
.scenarios {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.scenario-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.scenario-visual {
    height: 180px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.scenario-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.15) 1px, transparent 1px);
    background-size: 20px 20px;
}

.scenario-visual svg {
    width: 64px;
    height: 64px;
    color: var(--color-white);
    position: relative;
    z-index: 1;
}

.scenario-body {
    padding: var(--space-md);
}

.scenario-body h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.scenario-body p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin: 0;
}

/* ===== 用户评价 ===== */
.testimonials {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.testimonial-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    position: relative;
    transition: var(--transition);
}

.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.testimonial-card .quote-mark {
    font-size: 4rem;
    line-height: 1;
    color: var(--color-primary);
    opacity: 0.2;
    font-family: Georgia, serif;
    position: absolute;
    top: 0.5rem;
    right: 1.25rem;
}

.testimonial-stars {
    color: var(--color-accent-dark);
    margin-bottom: var(--space-sm);
    font-size: 1rem;
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 0.9375rem;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.author-info strong {
    display: block;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.author-info span {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ===== 平台支持 ===== */
.platforms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.platform-card {
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    transition: var(--transition);
}

.platform-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--space-md);
    color: var(--color-primary);
}

.platform-card h3 {
    margin-bottom: 0.5rem;
}

.platform-card p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

.platform-versions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    justify-content: center;
}

.platform-versions span {
    padding: 0.25rem 0.625rem;
    background: var(--color-bg-alt);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* ===== CTA 区域 ===== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--space-2xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.cta-section h2 {
    color: var(--color-white);
    margin-bottom: var(--space-sm);
    position: relative;
}

.cta-section p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-lg);
    position: relative;
}

.cta-section .btn {
    position: relative;
}

.cta-section .btn-secondary {
    background: var(--color-white);
    color: var(--color-primary-dark);
    border-color: var(--color-white);
}

.cta-section .btn-secondary:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary-dark);
}

/* ===== 页脚 ===== */
.site-footer {
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: var(--space-sm);
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.125rem;
}

.footer-brand img {
    width: 32px;
    height: 32px;
}

.footer-desc {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--space-md);
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 0.5rem;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col ul li a {
    color: var(--color-text-light);
    font-size: 0.875rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--color-primary);
    padding-left: 4px;
}

.footer-bottom {
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.footer-bottom a {
    color: var(--color-text-muted);
}

.footer-bottom a:hover {
    color: var(--color-primary);
}

/* ===== 下载弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(61, 56, 70, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: var(--space-md);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
	  left: 0;
	  right: 0;
	  top: 0;
	  bottom: 0;
}
button { outline: none } 
.modal {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 590px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.92) translateY(20px);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

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

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    transition: var(--transition);
    font-size: 1.25rem;
}

.modal-close:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-platforms {
    display: flex;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
    background: var(--color-bg-alt);
    padding: 0.375rem;
    border-radius: var(--radius-md);
}

.modal-platform {
    flex: 1;
    padding: 0.625rem;
    text-align: center;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.modal-platform.active {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.qr-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.qr-item {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.qr-code {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--space-sm);
    background: var(--color-white);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.qr-code img,
.qr-code svg {
    width: 100%;
    height: 100%;
}

.qr-item h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

.qr-item p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0;
}

.modal-info {
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 120, 0, 0.06);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: var(--space-md);
}

.modal-info strong {
    color: var(--color-primary-dark);
}

.modal-footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    font-size: 0.875rem;
}

/* ===== 页面通用横幅 ===== */
.page-hero {
    padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-xl);
    background:
        radial-gradient(circle at 80% 20%, rgba(255, 120, 0, 0.10) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-white) 100%);
    text-align: center;
}

.page-hero h1 {
    margin-bottom: var(--space-sm);
}

.page-hero p {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 720px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.breadcrumb a {
    color: var(--color-text-muted);
}

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

.breadcrumb span.separator {
    color: var(--color-text-light);
}

/* ===== 详细功能页样式 ===== */
.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    margin-bottom: var(--space-2xl);
}

.feature-detail:nth-child(even) .feature-detail-content {
    order: 2;
}

.feature-detail-content .eyebrow {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    display: block;
}

.feature-detail-content h2 {
    margin-bottom: var(--space-sm);
}

.feature-detail-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    font-size: 1.0625rem;
}

.feature-detail-list {
    display: grid;
    gap: 0.75rem;
    margin-bottom: var(--space-md);
}

.feature-detail-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    color: var(--color-text);
    font-size: 0.9375rem;
}

.feature-detail-list li::before {
    content: '✓';
    color: var(--color-primary);
    font-weight: 700;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: rgba(255, 120, 0, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    margin-top: 2px;
}

.feature-detail-visual {
    background: linear-gradient(135deg, var(--color-bg-alt), var(--color-white));
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.feature-detail-visual svg {
    width: 100%;
    max-width: 360px;
}

/* ===== 下载页表格 ===== */
.download-table {
    width: 100%;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    border-collapse: collapse;
}

.download-table thead {
    background: var(--color-bg-alt);
}

.download-table th,
.download-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

.download-table th {
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.download-table tbody tr:last-child td {
    border-bottom: none;
}

.download-table tbody tr:hover {
    background: rgba(255, 120, 0, 0.03);
}

/* ===== 文档页样式 ===== */
.docs-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.docs-sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--space-md));
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.docs-sidebar h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
    padding: 0 0.5rem;
}

.docs-nav {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    margin-bottom: var(--space-md);
}

.docs-nav a {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 0.9375rem;
    transition: var(--transition);
}

.docs-nav a:hover,
.docs-nav a.active {
    background: rgba(255, 120, 0, 0.08);
    color: var(--color-primary);
}

.docs-content {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.docs-content h2 {
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
}

.docs-content h3 {
    margin: var(--space-lg) 0 var(--space-sm);
}

.docs-content p {
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.docs-content ul,
.docs-content ol {
    margin: 0 0 var(--space-sm) var(--space-md);
    padding-left: var(--space-sm);
}

.docs-content ul li,
.docs-content ol li {
    list-style: disc;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.docs-content ol li { list-style: decimal; }

.docs-content code {
    background: var(--color-bg-alt);
    color: var(--color-primary-dark);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875em;
}

.docs-content pre {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
}

.docs-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.docs-content blockquote {
    border-left: 4px solid var(--color-primary);
    background: rgba(255, 120, 0, 0.05);
    padding: var(--space-sm) var(--space-md);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

/* ===== FAQ 折叠 ===== */
.faq-item {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--color-text);
    font-size: 1.0625rem;
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-question .icon {
    flex-shrink: 0;
    color: var(--color-primary);
    transition: var(--transition);
    font-size: 1.5rem;
    font-weight: 300;
}

.faq-item.active .faq-question .icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-inner {
    padding: 0 var(--space-md) var(--space-md);
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ===== 时间线 ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
    max-width: 720px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-white);
    border: 3px solid var(--color-primary);
    box-shadow: 0 0 0 4px rgba(255, 120, 0, 0.15);
}

.timeline-item .year {
    display: inline-block;
    padding: 0.125rem 0.625rem;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-item h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.timeline-item p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 0.9375rem;
}

/* ===== 数字徽章 ===== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    padding: var(--space-xl) 0;
}

.stat-block {
    text-align: center;
    padding: var(--space-md);
}

.stat-block .num {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-block .label {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* ===== 移动端响应 ===== */
@media (max-width: 1024px) {
    .feature-grid,
    .testimonials,
    .platforms {
        grid-template-columns: repeat(2, 1fr);
    }
    .scenarios {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }
    .docs-layout {
        grid-template-columns: 220px 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --space-2xl: 4rem;
        --space-xl: 2.5rem;
    }

    .nav-menu,
    .nav-actions .btn:not(.nav-download-btn) {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu.active {
        display: flex;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-md);
        gap: 0.25rem;
        align-items: stretch;
        overflow-y: auto;
    }

    .nav-menu.active a {
        padding: 0.875rem 1rem;
        font-size: 1.0625rem;
    }

    .nav-actions .nav-download-btn {
        display: inline-flex;
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .hero-grid,
    .feature-detail {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .feature-detail:nth-child(even) .feature-detail-content {
        order: 0;
    }

    .hero-visual {
        order: -1;
    }

    .hero-stats {
        gap: var(--space-md);
    }

    .feature-grid,
    .testimonials,
    .platforms,
    .scenarios {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .docs-layout {
        grid-template-columns: 1fr;
    }

    .docs-sidebar {
        position: static;
    }

    .stats-row {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }

    .qr-section {
        grid-template-columns: 1fr;
    }

    .hero-content .lead {
        font-size: 1.0625rem;
    }

    .modal {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }
    .hero-cta .btn {
        width: 100%;
    }
    .stats-row {
        grid-template-columns: 1fr;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .site-header,
    .site-footer,
    .nav-toggle,
    .modal-overlay {
        display: none !important;
    }
}

/* ===== 可访问性 ===== */
.btn:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===== 滚动到顶部 ===== */
.scroll-top {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 900;
    font-size: 1.25rem;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}