/* ===== 基础样式重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主题色 */
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary: #6366F1;
    --secondary-light: #818CF8;

    /* 功能色 */
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --info: #06B6D4;

    /* 中性色 */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #3B82F6 0%, #6366F1 100%);
    --gradient-hero: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 50%, #C7D2FE 100%);

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* 圆角 */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #fff;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

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

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--primary);
    object-fit: contain;
    border-radius: 4px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particle {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.1);
    animation: float 20s ease-in-out infinite;
}

.hero-particle:nth-child(1) {
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.hero-particle:nth-child(2) {
    bottom: 20%;
    left: 5%;
    width: 200px;
    height: 200px;
    animation-delay: -5s;
}

.hero-particle:nth-child(3) {
    top: 50%;
    right: 30%;
    width: 150px;
    height: 150px;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(100px, 0) scale(1); }
    75% { transform: translate(50px, 50px) scale(0.9); }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--gray-600);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--gray-500);
    margin-top: 4px;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.drone-animation {
    position: relative;
    animation: droneFloat 4s ease-in-out infinite;
}

.drone {
    width: 300px;
    height: 300px;
    filter: drop-shadow(0 20px 40px rgba(59, 130, 246, 0.3));
}

.propeller {
    transform-origin: center;
    animation: spin 0.1s linear infinite;
}

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

@keyframes droneFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--gray-500);
    font-size: 14px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

/* ===== Section 通用样式 ===== */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary);
    color: #fff;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-900);
}

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

/* ===== 服务模块 ===== */
.services {
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-800);
}

.service-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-features li {
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 12px;
    border-radius: var(--radius-full);
}

/* ===== 特性模块 ===== */
.features {
    background: #fff;
}

.features-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.feature-item {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-item:hover {
    background: #fff;
    box-shadow: var(--shadow-lg);
}

.feature-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.3;
    line-height: 1;
}

.feature-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-800);
}

.feature-info p {
    font-size: 14px;
    color: var(--gray-500);
}

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

.phone-frame {
    width: 280px;
    height: 560px;
    background: var(--gray-900);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #fff;
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.app-header {
    padding: 16px;
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 600;
    text-align: center;
}

.app-banner {
    padding: 24px 16px;
    background: linear-gradient(135deg, #60A5FA 0%, #3B82F6 100%);
    color: #fff;
}

.app-banner span {
    display: block;
    font-size: 18px;
    font-weight: 600;
}

.app-banner small {
    font-size: 12px;
    opacity: 0.8;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    padding: 16px;
    background: #fff;
}

.app-item {
    padding: 12px 8px;
    text-align: center;
    font-size: 12px;
    color: var(--gray-600);
    background: var(--gray-50);
    border-radius: var(--radius);
}

.app-list {
    flex: 1;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.app-list-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius);
    font-size: 12px;
}

.item-tag {
    padding: 2px 6px;
    background: var(--error);
    color: #fff;
    font-size: 10px;
    border-radius: var(--radius-sm);
}

.item-price {
    margin-left: auto;
    color: var(--error);
    font-weight: 600;
}

/* ===== 场景模块 ===== */
.scenarios {
    background: var(--gray-50);
}

.scenarios-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
}

.scenario-panel {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-lg);
}

.scenario-panel.active {
    display: grid;
}

.scenario-info h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.scenario-info p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 24px;
}

.scenario-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.scenario-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--gray-700);
}

.scenario-features li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
}

.scenario-image {
    display: flex;
    justify-content: center;
}

.scenario-placeholder {
    width: 100%;
    max-width: 400px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.scenario-placeholder svg {
    width: 100%;
    height: auto;
}

/* ===== 关于我们 ===== */
.about {
    background: #fff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-info .section-tag,
.about-info .section-title {
    text-align: left;
}

.about-text {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 32px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-700);
}

.highlight-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
}

.highlight-icon svg {
    width: 20px;
    height: 20px;
}

.about-visual {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-card {
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--gray-200);
}

.about-card .card-header h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.about-card p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===== 下载区域 ===== */
.download {
    background: var(--gradient-primary);
    padding: 80px 0;
}

.download-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.download-info h2 {
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.download-info p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
}

.download-qr-group {
    display: flex;
    gap: 24px;
    flex-shrink: 0;
}

.qr-placeholder {
    width: 160px;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.qr-placeholder svg,
.qr-placeholder img {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

.qr-placeholder span {
    font-size: 13px;
    color: var(--gray-500);
}

/* ===== 联系我们 ===== */
.contact {
    background: var(--gray-50);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 20px;
}

.contact-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--gray-800);
}

.contact-text p {
    font-size: 14px;
    color: var(--gray-500);
}

.contact-form {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--gray-900);
    color: #fff;
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--gray-700);
}

.footer-brand .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-brand .logo-icon {
    color: #fff;
    filter: brightness(0) invert(1);
}

.footer-brand .logo-text {
    background: none;
    -webkit-text-fill-color: #fff;
}

.footer-desc {
    font-size: 14px;
    color: var(--gray-400);
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-column a {
    display: block;
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 12px;
}

.footer-column a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.icp-link {
    color: var(--gray-500);
    text-decoration: none;
    transition: var(--transition);
}

.icp-link:hover {
    color: var(--gray-300);
    text-decoration: underline;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    color: #fff;
    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: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

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

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

    .hero-image {
        display: none;
    }

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

    .features-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .features-visual {
        order: -1;
    }

    .scenario-panel {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-info .section-tag,
    .about-info .section-title {
        text-align: center;
    }

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

    .about-highlights {
        align-items: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-actions {
        display: none;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

    .section-title {
        font-size: 28px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .scenarios-tabs {
        gap: 8px;
    }

    .tab-btn {
        padding: 10px 16px;
        font-size: 13px;
    }

    .scenario-panel {
        padding: 24px;
    }

    .download-content {
        flex-direction: column;
        text-align: center;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .stat-number {
        font-size: 28px;
    }

    .phone-frame {
        width: 240px;
        height: 480px;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* ===== 动画效果 ===== */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
    transform: translateX(0);
}