/* ==================== 他趣 TaQu - 黄黑主题样式 ==================== */
/* 设计变量：基于他趣 logo 的黄黑配色 */
:root {
    --yellow: #FFD500;
    --yellow-deep: #FFB800;
    --yellow-light: #FFE54D;
    --yellow-soft: #FFF7CC;
    --black: #1A1A1A;
    --black-soft: #2A2A2A;
    --gray-900: #111111;
    --gray-700: #444444;
    --gray-500: #777777;
    --gray-300: #DDDDDD;
    --gray-100: #F5F5F5;
    --white: #FFFFFF;
    --shadow-yellow: 0 10px 40px rgba(255, 184, 0, 0.35);
    --shadow-dark: 0 20px 60px rgba(0, 0, 0, 0.25);
    --radius: 16px;
    --radius-lg: 24px;
    --max-width: 1200px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

a {
    text-decoration: none;
    color: inherit;
}

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

/* ==================== 顶部导航 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 26, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 213, 0, 0.15);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(26, 26, 26, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 40px;
    width: 40px;
    object-fit: contain;
}

.logo-text {
    font-size: 24px;
    font-weight: 900;
    color: var(--yellow);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: 30px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--yellow);
    background: rgba(255, 213, 0, 0.1);
}

.nav-cta {
    background: var(--yellow);
    color: var(--black) !important;
    font-weight: 700;
    padding: 10px 26px;
    box-shadow: 0 4px 16px rgba(255, 213, 0, 0.4);
}

.nav-cta:hover {
    background: var(--yellow-deep);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 213, 0, 0.5);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    width: 26px;
    height: 3px;
    background: var(--yellow);
    border-radius: 3px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==================== 首屏 Hero ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    background: var(--black);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 213, 0, 0.18), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 184, 0, 0.12), transparent 50%),
        linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 213, 0, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 213, 0, 0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 70%);
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(255, 213, 0, 0.15);
    border: 1px solid rgba(255, 213, 0, 0.4);
    border-radius: 30px;
    color: var(--yellow);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: clamp(2.4rem, 5vw, 4rem);
    font-weight: 900;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: 1px;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--yellow) 0%, var(--yellow-deep) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 32px;
    max-width: 560px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 36px;
    padding: 18px 28px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 213, 0, 0.2);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease 0.3s both;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.meta-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.meta-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--yellow);
}

.meta-divider {
    width: 1px;
    height: 32px;
    background: rgba(255, 213, 0, 0.25);
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 700;
    transition: var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-lg {
    padding: 16px 38px;
    font-size: 17px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--yellow) 0%, var(--yellow-deep) 100%);
    color: var(--black);
    box-shadow: var(--shadow-yellow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 50px rgba(255, 184, 0, 0.5);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.08);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-ghost:hover {
    background: rgba(255, 213, 0, 0.12);
    border-color: var(--yellow);
    color: var(--yellow);
}

/* ==================== 首屏截图叠加展示 ==================== */
.hero-visual {
    position: relative;
    height: 560px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.shots-stack {
    position: relative;
    width: 100%;
    height: 100%;
    perspective: 1200px;
}

.shot {
    position: absolute;
    width: 220px;
    height: 440px;
    border-radius: 28px;
    overflow: hidden;
    box-shadow: var(--shadow-dark);
    border: 3px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    cursor: pointer;
    transform-style: preserve-3d;
}

.shot img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.shot-tag {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 18px;
    background: rgba(255, 213, 0, 0.95);
    color: var(--black);
    font-size: 13px;
    font-weight: 700;
    border-radius: 20px;
    white-space: nowrap;
}

/* 三张截图叠加定位 + 动态效果 */
.shot-1 {
    left: 50%;
    top: 50%;
    transform: translate(-110%, -50%) rotate(-8deg) scale(0.9);
    z-index: 1;
    opacity: 0.85;
}

.shot-2 {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -52%) rotate(0deg) scale(1);
    z-index: 3;
    opacity: 1;
}

.shot-3 {
    left: 50%;
    top: 50%;
    transform: translate(10%, -50%) rotate(8deg) scale(0.9);
    z-index: 1;
    opacity: 0.85;
}

/* 悬停时该截图前置放大 */
.shot.active {
    z-index: 10;
    transform: translate(-50%, -52%) rotate(0deg) scale(1.08) !important;
    opacity: 1;
    box-shadow: 0 30px 80px rgba(255, 184, 0, 0.4);
}

.shots-stack:hover .shot:not(.active) {
    opacity: 0.6;
}

/* 浮动动画 */
.shot-1 { animation: floatA 6s ease-in-out infinite; }
.shot-3 { animation: floatB 6s ease-in-out infinite; }

@keyframes floatA {
    0%, 100% { transform: translate(-110%, -50%) rotate(-8deg) scale(0.9); }
    50% { transform: translate(-112%, -52%) rotate(-10deg) scale(0.9); }
}

@keyframes floatB {
    0%, 100% { transform: translate(10%, -50%) rotate(8deg) scale(0.9); }
    50% { transform: translate(12%, -48%) rotate(10deg) scale(0.9); }
}

.shots-dots {
    display: flex;
    gap: 10px;
    margin-top: 24px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

.dot.active {
    background: var(--yellow);
    width: 30px;
    border-radius: 5px;
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
    letter-spacing: 2px;
    z-index: 2;
    animation: bounceDown 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 1px;
    height: 30px;
    background: linear-gradient(to bottom, var(--yellow), transparent);
}

@keyframes bounceDown {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== 数据统计条 ==================== */
.stats-bar {
    background: var(--yellow);
    padding: 40px 24px;
}

.stats-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-num {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    font-weight: 900;
    color: var(--black);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-700);
    font-weight: 500;
}

/* ==================== 通用 section 标题 ==================== */
.section-head {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 5px 16px;
    background: var(--yellow-soft);
    color: var(--yellow-deep);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    border-radius: 20px;
    margin-bottom: 18px;
}

.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 900;
    color: var(--gray-900);
    margin-bottom: 14px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-500);
}

/* ==================== 功能特色 ==================== */
.features {
    padding: 100px 24px;
    background: var(--gray-100);
}

.features-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--yellow), var(--yellow-deep));
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 213, 0, 0.3);
}

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

.feature-icon {
    width: 76px;
    height: 76px;
    margin: 0 auto 22px;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--yellow-soft), var(--yellow-light));
    color: var(--black);
    transition: var(--transition);
}

.feature-icon svg {
    width: 38px;
    height: 38px;
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--yellow), var(--yellow-deep));
    transform: rotateY(180deg);
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 14px;
}

.feature-card p {
    color: var(--gray-500);
    font-size: 15px;
    line-height: 1.75;
}

/* ==================== 用户评价 ==================== */
.reviews {
    padding: 100px 24px;
    background: var(--white);
}

.reviews-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.review-card {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: var(--transition);
    position: relative;
    border-top: 4px solid var(--yellow);
}

.review-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
    background: var(--white);
}

.review-stars {
    color: var(--yellow-deep);
    font-size: 20px;
    letter-spacing: 3px;
    margin-bottom: 18px;
}

.review-text {
    color: var(--gray-700);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 14px;
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--yellow), var(--yellow-deep));
    color: var(--black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
}

.user-name {
    font-weight: 700;
    color: var(--gray-900);
    font-size: 15px;
}

.user-meta {
    font-size: 13px;
    color: var(--gray-500);
}

/* ==================== 常见问题 ==================== */
.faq {
    padding: 100px 24px;
    background: var(--gray-100);
}

.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--gray-300);
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--yellow);
    box-shadow: 0 10px 30px rgba(255, 213, 0, 0.15);
}

.faq-question {
    width: 100%;
    padding: 22px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    font-size: 17px;
    font-weight: 700;
    color: var(--gray-900);
    transition: var(--transition);
}

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

.faq-item.active .faq-question {
    color: var(--yellow-deep);
}

.faq-icon {
    position: relative;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--yellow-deep);
    border-radius: 2px;
    transition: var(--transition);
}

.faq-icon::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 3px;
    transform: translateY(-50%);
}

.faq-icon::after {
    left: 50%;
    top: 0;
    width: 3px;
    height: 100%;
    transform: translateX(-50%);
}

.faq-item.active .faq-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-answer p {
    padding: 0 28px 24px;
    color: var(--gray-500);
    font-size: 15px;
    line-height: 1.8;
}

/* ==================== 下载区域（着重突出） ==================== */
.download {
    position: relative;
    padding: 120px 24px;
    overflow: hidden;
    background: var(--black);
}

.download-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 30% 40%, rgba(255, 213, 0, 0.25), transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255, 184, 0, 0.15), transparent 50%),
        linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
}

.download-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 213, 0, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 213, 0, 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}

.download-container {
    position: relative;
    z-index: 2;
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 60px;
    align-items: center;
}

.download-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(255, 213, 0, 0.15);
    border: 1px solid rgba(255, 213, 0, 0.4);
    border-radius: 30px;
    color: var(--yellow);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 22px;
}

.download-title {
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 22px;
}

.download-desc {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 32px;
    max-width: 540px;
    line-height: 1.8;
}

.download-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 36px;
}

.dl-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 213, 0, 0.2);
    border-radius: 12px;
    min-width: 100px;
}

.dl-meta-label {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.dl-meta-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--yellow);
}

/* 主下载按钮 - 着重突出 */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    padding: 22px 56px;
    background: linear-gradient(135deg, var(--yellow) 0%, var(--yellow-deep) 100%);
    color: var(--black);
    font-size: 22px;
    font-weight: 900;
    border-radius: 60px;
    box-shadow: 0 15px 50px rgba(255, 184, 0, 0.5), 0 0 0 0 rgba(255, 213, 0, 0.7);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    animation: pulseGlow 2.5s ease-in-out infinite;
}

.btn-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.btn-download:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 25px 70px rgba(255, 184, 0, 0.7);
}

.btn-download:hover::before {
    left: 100%;
}

.dl-icon {
    width: 28px;
    height: 28px;
}

.download-tip {
    margin-top: 18px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 15px 50px rgba(255, 184, 0, 0.5), 0 0 0 0 rgba(255, 213, 0, 0.6); }
    50% { box-shadow: 0 15px 50px rgba(255, 184, 0, 0.5), 0 0 0 20px rgba(255, 213, 0, 0); }
}

/* 手机模型 */
.download-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 260px;
    height: 520px;
    background: linear-gradient(145deg, #2a2a2a, #0d0d0d);
    border-radius: 44px;
    padding: 14px;
    box-shadow: var(--shadow-dark), 0 0 60px rgba(255, 184, 0, 0.2);
    border: 2px solid rgba(255, 213, 0, 0.2);
    position: relative;
    animation: phoneFloat 4s ease-in-out infinite;
}

@keyframes phoneFloat {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-15px) rotate(2deg); }
}

.phone-logo {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    z-index: 3;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(160deg, var(--yellow) 0%, var(--yellow-deep) 100%);
    border-radius: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.phone-screen::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.phone-status {
    position: relative;
    z-index: 2;
    color: var(--black);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
    opacity: 0.7;
}

.phone-cta {
    position: relative;
    z-index: 2;
    color: var(--black);
    font-size: 28px;
    font-weight: 900;
    line-height: 1.3;
}

/* ==================== 页脚 ==================== */
.footer {
    background: #0a0a0a;
    color: rgba(255, 255, 255, 0.6);
    padding: 60px 24px 30px;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    height: 48px;
    width: 48px;
    object-fit: contain;
}

.footer-name {
    font-size: 22px;
    font-weight: 900;
    color: var(--yellow);
    letter-spacing: 2px;
}

.footer-slogan {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 2px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 30px;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--yellow);
}

.footer-info p {
    font-size: 13px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.4);
}

.footer-info .copyright {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.3);
}

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--yellow);
    color: var(--black);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-yellow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    background: var(--yellow-deep);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ==================== 滚动揭示动画 ==================== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 响应式 ==================== */
@media (max-width: 992px) {
    .hero-container,
    .download-container {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .hero-content {
        order: 2;
    }

    .hero-visual {
        order: 1;
        height: 440px;
    }

    .hero-desc,
    .download-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-meta,
    .download-meta {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .features-grid,
    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(26, 26, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: stretch;
        padding: 20px 24px;
        gap: 8px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-bottom: 1px solid rgba(255, 213, 0, 0.15);
    }

    .nav-menu.open {
        transform: translateY(0);
    }

    .nav-link {
        padding: 14px 20px;
        text-align: center;
    }

    .nav-cta {
        margin-top: 8px;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 110px 20px 60px;
        min-height: auto;
    }

    .hero-visual {
        height: 380px;
    }

    .shot {
        width: 170px;
        height: 340px;
    }

    .features,
    .reviews,
    .faq {
        padding: 70px 20px;
    }

    .download {
        padding: 80px 20px;
    }

    .features-grid,
    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .feature-card,
    .review-card {
        padding: 32px 24px;
    }

    .phone-mockup {
        width: 220px;
        height: 440px;
    }

    .btn-download {
        padding: 20px 44px;
        font-size: 19px;
    }

    .hero-meta {
        flex-wrap: wrap;
        gap: 16px;
        padding: 16px 20px;
    }

    .meta-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-visual {
        height: 320px;
    }

    .shot {
        width: 140px;
        height: 280px;
        border-radius: 20px;
    }

    .shot-tag {
        font-size: 11px;
        padding: 4px 12px;
    }

    .stats-container {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .download-meta {
        flex-direction: column;
        align-items: stretch;
    }

    .dl-meta-item {
        min-width: auto;
    }

    .footer-links {
        gap: 16px;
    }
}