/**
 * ============================================================
 * 淮安M88装饰工程股份有限公司 - 品牌形象官网
 * 样式表 (style.css)
 * 版本: 1.0
 * 描述: Mobile-First 品牌视觉系统
 * ============================================================
 */

/* ============================================================
   1. CSS 自定义属性 (品牌设计令牌)
   ============================================================ */
:root {
    /* 品牌色 */
    --color-primary: #1A3C5E;
    --color-secondary: #C9A96E;
    --color-accent: #E8862A;
    --color-bg-light: #F7F5F0;
    --color-text-dark: #222222;
    --color-white: #ffffff;
    --color-gray-100: #f8f7f4;
    --color-gray-200: #e8e5de;
    --color-gray-300: #d0ccc4;
    --color-gray-400: #a8a39a;
    --color-gray-500: #6b655a;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.5rem;
    --spacing-xxl: 4rem;
    --spacing-xxxl: 6rem;

    /* 容器宽度 */
    --container-max: 1200px;
    --container-padding: 1.25rem;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(26, 60, 94, 0.08);
    --shadow-md: 0 4px 20px rgba(26, 60, 94, 0.12);
    --shadow-lg: 0 8px 40px rgba(26, 60, 94, 0.16);
    --shadow-glow: 0 0 24px rgba(232, 134, 42, 0.35);

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 字体大小 (Mobile-First) */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-md: 1.125rem;
    --text-lg: 1.25rem;
    --text-xl: 1.5rem;
    --text-2xl: 1.875rem;
    --text-3xl: 2.25rem;
    --text-4xl: 3rem;
}

/* ============================================================
   2. 重置样式 & 基础设置
   ============================================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-dark);
    background-color: var(--color-bg-light);
}

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

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

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

ul,
ol {
    list-style: none;
}

button,
input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    border: none;
    background: none;
    outline: none;
}

button {
    cursor: pointer;
}

/* ============================================================
   3. 通用工具类
   ============================================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section-padding {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: var(--text-md);
    color: var(--color-gray-500);
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--spacing-xl) auto;
    line-height: 1.6;
}

.text-center {
    text-align: center;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ============================================================
   4. 按钮样式
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-weight: 600;
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-align: center;
    line-height: 1.4;
    border: 2px solid transparent;
    white-space: nowrap;
    min-height: 48px;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}
.btn--primary:hover {
    background-color: #143048;
    border-color: #143048;
    box-shadow: var(--shadow-md);
    transform: scale(1.04);
}

.btn--secondary {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border-color: var(--color-secondary);
}
.btn--secondary:hover {
    background-color: #dbb97a;
    border-color: #dbb97a;
    box-shadow: var(--shadow-md);
    transform: scale(1.04);
}

.btn--accent {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}
.btn--accent:hover {
    background-color: #f0933a;
    border-color: #f0933a;
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}
.btn--outline:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
    transform: scale(1.04);
    box-shadow: var(--shadow-md);
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn--ghost:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.04);
    box-shadow: var(--shadow-md);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ============================================================
   5. 头部 / 导航 (Sticky Header)
   ============================================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(201, 169, 110, 0.2);
    box-shadow: 0 2px 20px rgba(26, 60, 94, 0.06);
    transition: box-shadow var(--transition-base);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    padding: 0 var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

/* Logo (纯文字) */
.logo {
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    flex-shrink: 0;
    line-height: 1.2;
}
.logo span {
    color: var(--color-secondary);
}
.logo:hover {
    color: var(--color-primary);
}

/* 桌面导航 */
.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav__link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-dark);
    padding: 0.3rem 0;
    position: relative;
    transition: color var(--transition-fast);
    letter-spacing: 0.01em;
}
.nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-base);
}
.nav__link:hover {
    color: var(--color-primary);
}
.nav__link:hover::after {
    width: 100%;
}
.nav__link--active {
    color: var(--color-primary);
}
.nav__link--active::after {
    width: 100%;
}

.nav__cta {
    margin-left: var(--spacing-sm);
}

/* 汉堡按钮 (移动端) */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 6px 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.hamburger__bar {
    display: block;
    width: 26px;
    height: 2.5px;
    background-color: var(--color-primary);
    border-radius: 4px;
    transition: all var(--transition-base);
    transform-origin: center;
}
.hamburger--active .hamburger__bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.hamburger--active .hamburger__bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger--active .hamburger__bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================================
   6. 英雄区 (Hero)
   ============================================================ */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background-color: var(--color-primary);
}

.hero__image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
            rgba(26, 60, 94, 0.78) 0%,
            rgba(26, 60, 94, 0.55) 50%,
            rgba(26, 60, 94, 0.40) 100%);
    z-index: 1;
}

.hero__content {
    position: relative;
    z-index: 2;
    padding: var(--spacing-xxl) var(--container-padding);
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-white);
}

.hero__title {
    font-size: var(--text-3xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    text-shadow: 0 4px 24px rgba(0, 0, 0, 0.20);
}

.hero__subtitle {
    font-size: var(--text-md);
    font-weight: 400;
    opacity: 0.92;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.hero__cta .btn {
    min-width: 180px;
}

/* ============================================================
   7. 痛点 (Pain Points)
   ============================================================ */
.pain-points {
    background-color: var(--color-white);
}

.pain-points__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.pain-card {
    background: var(--color-bg-light);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}
.pain-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-secondary);
}

.pain-card__icon {
    font-size: 2.8rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.pain-card__title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.pain-card__desc {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ============================================================
   8. 解决方案 (Solutions)
   ============================================================ */
.solutions {
    background-color: var(--color-bg-light);
}

.solutions__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.solution-card {
    background: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-base);
    border-top: 4px solid var(--color-secondary);
}
.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.solution-card__icon {
    font-size: 2.4rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.solution-card__title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.solution-card__desc {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ============================================================
   9. 信任背书 (Social Proof)
   ============================================================ */
.testimonials {
    background-color: var(--color-white);
}

.testimonials__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.testimonial-card {
    background: var(--color-bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}
.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.testimonial-card__header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.testimonial-card__avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--color-gray-200);
    flex-shrink: 0;
}

.testimonial-card__name {
    font-weight: 700;
    color: var(--color-primary);
    font-size: var(--text-base);
}

.testimonial-card__role {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.testimonial-card__text {
    font-size: var(--text-base);
    color: var(--color-text-dark);
    line-height: 1.7;
    font-style: italic;
}

.testimonial-card__text::before {
    content: '"';
    color: var(--color-secondary);
    font-size: 1.6rem;
    font-weight: 700;
    margin-right: 2px;
}
.testimonial-card__text::after {
    content: '"';
    color: var(--color-secondary);
    font-size: 1.6rem;
    font-weight: 700;
    margin-left: 2px;
}

/* 信任徽章 */
.trust-badge {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md) var(--spacing-xl);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
}

.trust-badge__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-primary);
}
.trust-badge__item span {
    font-size: 1.4rem;
}

/* ============================================================
   10. 关于我们 (About)
   ============================================================ */
.about {
    background-color: var(--color-bg-light);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    align-items: center;
}

.about__image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--color-gray-200);
}
.about__image img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.about__content h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.about__content p {
    color: var(--color-gray-500);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about__info {
    display: grid;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
}

.about__info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--text-sm);
    color: var(--color-text-dark);
}
.about__info-item strong {
    color: var(--color-primary);
    min-width: 60px;
}

/* ============================================================
   11. FAQ (常见问题)
   ============================================================ */
.faq {
    background-color: var(--color-white);
}

.faq__list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
    overflow: hidden;
    transition: all var(--transition-base);
}
.faq-item:hover {
    border-color: var(--color-secondary);
}

.faq-item__question {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--color-primary);
    background: transparent;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
    gap: var(--spacing-md);
}
.faq-item__question:hover {
    background: rgba(201, 169, 110, 0.08);
}

.faq-item__question .faq-item__icon {
    flex-shrink: 0;
    font-size: 1.2rem;
    transition: transform var(--transition-base);
    color: var(--color-secondary);
}

.faq-item--open .faq-item__question .faq-item__icon {
    transform: rotate(180deg);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    padding: 0 var(--spacing-lg);
}

.faq-item--open .faq-item__answer {
    max-height: 400px;
    padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
}

.faq-item__answer p {
    color: var(--color-gray-500);
    line-height: 1.7;
    font-size: var(--text-base);
}

/* ============================================================
   12. 终极呼吁 (Final CTA)
   ============================================================ */
.cta-final {
    background: var(--color-primary);
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}
.cta-final::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(201, 169, 110, 0.10) 0%, transparent 60%);
    pointer-events: none;
}

.cta-final .section-title {
    color: var(--color-white);
}

.cta-final .section-subtitle {
    color: rgba(255, 255, 255, 0.80);
}

.cta-final__form {
    max-width: 560px;
    margin: var(--spacing-xl) auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.cta-final__form .form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.cta-final__form label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
}

.cta-final__form input,
.cta-final__form select {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1.5px solid rgba(255, 255, 255, 0.20);
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
    width: 100%;
}
.cta-final__form input::placeholder {
    color: rgba(255, 255, 255, 0.45);
}
.cta-final__form input:focus,
.cta-final__form select:focus {
    border-color: var(--color-secondary);
    background: rgba(255, 255, 255, 0.14);
    box-shadow: 0 0 0 4px rgba(201, 169, 110, 0.15);
}

.cta-final__form select option {
    color: var(--color-text-dark);
    background: var(--color-white);
}

.cta-final__form .btn {
    margin-top: var(--spacing-sm);
}

.cta-final__contact {
    text-align: center;
    margin-top: var(--spacing-xl);
    font-size: var(--text-base);
    color: rgba(255, 255, 255, 0.85);
}
.cta-final__contact a {
    color: var(--color-secondary);
    font-weight: 600;
}
.cta-final__contact a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

/* ============================================================
   13. 页尾 (Footer)
   ============================================================ */
.footer {
    background-color: #142d45;
    color: rgba(255, 255, 255, 0.75);
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__brand .logo {
    color: var(--color-white);
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-sm);
    display: inline-block;
}
.footer__brand .logo span {
    color: var(--color-secondary);
}
.footer__brand p {
    font-size: var(--text-sm);
    line-height: 1.7;
    max-width: 320px;
}

.footer__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.footer__info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--text-sm);
}
.footer__info-item span {
    font-size: 1.1rem;
}
.footer__info-item a {
    color: rgba(255, 255, 255, 0.75);
}
.footer__info-item a:hover {
    color: var(--color-secondary);
}

.footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md) var(--spacing-lg);
}
.footer__links a {
    color: rgba(255, 255, 255, 0.70);
    font-size: var(--text-sm);
}
.footer__links a:hover {
    color: var(--color-secondary);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    font-size: var(--text-sm);
    text-align: center;
    color: rgba(255, 255, 255, 0.55);
}
.footer__bottom a {
    color: rgba(255, 255, 255, 0.55);
}
.footer__bottom a:hover {
    color: var(--color-secondary);
}

/* ============================================================
   14. 响应式设计
   ============================================================ */

/* --- 平板 (≥576px) --- */
@media (min-width: 576px) {
    :root {
        --text-3xl: 2.75rem;
        --text-4xl: 3.5rem;
    }

    .pain-points__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .solutions__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .testimonials__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero__title {
        font-size: var(--text-3xl);
    }
}

/* --- 桌面 (≥768px) --- */
@media (min-width: 768px) {
    :root {
        --container-padding: 2rem;
        --text-2xl: 2.25rem;
        --text-3xl: 3.25rem;
        --text-4xl: 4rem;
    }

    .section-padding {
        padding: var(--spacing-xxxl) 0;
    }

    /* 导航显示 */
    .hamburger {
        display: none !important;
    }
    .nav__list {
        display: flex !important;
    }

    .hero {
        min-height: 80vh;
    }
    .hero__content {
        padding: var(--spacing-xxxl) var(--container-padding);
    }
    .hero__title {
        font-size: var(--text-3xl);
    }

    .pain-points__grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .solutions__grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .testimonials__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .about__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xxl);
    }

    .footer__grid {
        grid-template-columns: 2fr 1fr;
        gap: var(--spacing-xxl);
    }
    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .cta-final__form {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .cta-final__form .form-group {
        flex: 1 1 calc(50% - var(--spacing-sm));
    }
    .cta-final__form .form-group--full {
        flex: 1 1 100%;
    }
    .cta-final__form .btn {
        flex: 1 1 100%;
    }
}

/* --- 大桌面 (≥1024px) --- */
@media (min-width: 1024px) {
    :root {
        --container-padding: 2.5rem;
        --text-2xl: 2.75rem;
        --text-3xl: 4rem;
        --text-4xl: 4.5rem;
    }

    .header__inner {
        height: 76px;
    }

    .hero__title {
        font-size: var(--text-3xl);
    }
    .hero__subtitle {
        font-size: var(--text-lg);
    }

    .pain-card {
        padding: var(--spacing-xl);
    }
    .solution-card {
        padding: var(--spacing-xl);
    }
}

/* ============================================================
   15. 移动端导航 (汉堡菜单)
   ============================================================ */
@media (max-width: 767px) {
    .hamburger {
        display: flex;
    }

    .nav__list {
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: var(--spacing-lg) var(--container-padding);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--color-gray-200);
        box-shadow: var(--shadow-md);
        display: none;
        align-items: stretch;
    }

    .nav__list--open {
        display: flex;
    }

    .nav__link {
        padding: 0.6rem 0;
        font-size: var(--text-base);
        border-bottom: 1px solid var(--color-gray-100);
    }
    .nav__link::after {
        display: none;
    }

    .nav__cta {
        margin-left: 0;
        margin-top: var(--spacing-sm);
    }
    .nav__cta .btn {
        width: 100%;
        justify-content: center;
    }

    /* 移动端FAQ调整 */
    .faq-item__question {
        font-size: var(--text-sm);
        padding: var(--spacing-md);
    }
    .faq-item__answer p {
        font-size: var(--text-sm);
    }
}

/* ============================================================
   16. 辅助类 & 微交互
   ============================================================ */

/* 滚动渐入动画 (配合JS) */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in--visible {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟辅助 */
.delay-1 {
    transition-delay: 0.08s;
}
.delay-2 {
    transition-delay: 0.16s;
}
.delay-3 {
    transition-delay: 0.24s;
}
.delay-4 {
    transition-delay: 0.32s;
}

/* 选中高亮 */
::selection {
    background: var(--color-secondary);
    color: var(--color-primary);
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--color-bg-light);
}
::-webkit-scrollbar-thumb {
    background: var(--color-secondary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* 打印样式 */
@media print {
    .header,
    .hero__overlay,
    .btn,
    .hamburger,
    .cta-final__form {
        display: none !important;
    }
    .hero {
        min-height: auto;
        padding: 2rem 0;
        background: var(--color-white);
    }
    .hero__content {
        color: var(--color-text-dark);
    }
    .hero__title {
        color: var(--color-primary);
    }
    .section-padding {
        padding: 1.5rem 0 !important;
    }
    body {
        background: white;
    }
}