/* ========================================
   好飞天气（成都）科技有限公司 官方网站
   Haofei Weather (Chengdu) Technology Co., Ltd.
   ======================================== */

/* --- CSS Variables --- */
:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --accent: #00b4d8;
    --accent-dark: #0096b7;
    --text: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Section Layout --- */
.section {
    padding: 100px 0;
}

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

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    font-size: 32px;
    line-height: 1;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text strong {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.logo-text small {
    font-size: 11px;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: inline-block;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, #e8f4fd 0%, #ffffff 50%, #f0f7ff 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(26, 115, 232, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 500px 350px at 80% 60%, rgba(0, 180, 216, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 300px 300px at 60% 20%, rgba(26, 115, 232, 0.04) 0%, transparent 70%);
    z-index: -1;
}

.hero-clouds {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse 200px 60px at 15% 25%, rgba(255, 255, 255, 0.8) 0%, transparent 100%),
        radial-gradient(ellipse 180px 50px at 70% 35%, rgba(255, 255, 255, 0.6) 0%, transparent 100%),
        radial-gradient(ellipse 150px 40px at 45% 55%, rgba(255, 255, 255, 0.7) 0%, transparent 100%);
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-subtitle {
    display: block;
    font-size: 18px;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.hero-title {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 28px;
    letter-spacing: -0.02em;
}

.text-highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 19px;
    color: var(--text-secondary);
    line-height: 1.9;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #ffffff;
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* --- Hero Stats --- */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--text);
    line-height: 1.2;
}

.stat-unit {
    font-size: 18px;
    font-weight: 600;
}

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

/* --- Scroll Indicator --- */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0.5;
    transition: opacity var(--transition);
    z-index: 1;
}

.scroll-indicator:hover {
    opacity: 1;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--primary);
    border-bottom: 2px solid var(--primary);
    transform: rotate(45deg);
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); }
    50% { transform: rotate(45deg) translate(4px, 4px); }
}

/* --- About Cards --- */
.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.about-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}

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

.about-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}

.about-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

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

/* --- Business Cards --- */
.business-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.business-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition);
}

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

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

.business-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.business-num {
    font-size: 40px;
    font-weight: 900;
    color: var(--primary-light);
    line-height: 1;
}

.business-icon {
    font-size: 36px;
}

.business-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.business-card > p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.business-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.business-list li {
    font-size: 13px;
    font-weight: 500;
    color: var(--primary);
    background: var(--primary-light);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

/* --- Technology --- */
.tech-showcase {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.tech-main {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.tech-patent-badge {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #92400e;
    font-weight: 700;
    font-size: 14px;
    border-radius: var(--radius-full);
    margin-bottom: 20px;
}

.tech-main h3 {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 12px;
    color: var(--text);
}

.tech-patent-id {
    font-size: 14px;
    color: var(--text-light);
    font-family: "SF Mono", "Fira Code", monospace;
    margin-bottom: 16px;
}

.tech-main > p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

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

.tech-features li {
    font-size: 14px;
    color: var(--text-secondary);
    padding-left: 24px;
    position: relative;
    line-height: 1.6;
}

.tech-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

.tech-features li strong {
    color: var(--text);
}

.tech-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-grid-icons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.tech-icon-item {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    font-size: 36px;
    transition: all var(--transition);
}

.tech-icon-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tech-icon-item div {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* --- Products --- */
.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: center;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.product-image {
    background: linear-gradient(135deg, #e8f4fd, #f0f7ff);
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-placeholder {
    text-align: center;
    font-size: 60px;
}

.product-placeholder span:last-child {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-top: 8px;
}

.product-info {
    padding: 48px 40px 48px 0;
}

.product-badge {
    display: inline-block;
    padding: 6px 14px;
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    color: #166534;
    font-weight: 700;
    font-size: 13px;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.product-info h3 {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 8px;
}

.product-meta {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.product-info > p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.product-capabilities {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.capability {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
}

.cap-icon {
    font-size: 18px;
}

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

.partner-item {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}

.partner-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.partner-icon {
    font-size: 40px;
    margin-bottom: 12px;
    display: block;
}

.partner-item h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.partner-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

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

.news-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    position: relative;
}

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

.news-date {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.news-card h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 12px;
    color: var(--text);
}

.news-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.news-tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-dark);
    background: rgba(0, 180, 216, 0.08);
    border-radius: var(--radius-full);
}

/* --- Contact --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 24px;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border-radius: var(--radius);
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
    background: #ffffff;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

/* --- Footer --- */
.footer {
    background: var(--bg-dark);
    color: #cbd5e1;
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    color: #94a3b8;
}

.footer h4 {
    font-size: 16px;
    font-weight: 700;
    color: #f1f5f9;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links ul li {
    font-size: 14px;
    color: #94a3b8;
    transition: color var(--transition);
    cursor: pointer;
}

.footer-links ul li a:hover,
.footer-links ul li:hover {
    color: #ffffff;
}

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

.qr-placeholder {
    width: 100px;
    height: 100px;
    background: #1e293b;
    border-radius: var(--radius);
    margin: 0 auto 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
}

.footer-qr p {
    font-size: 12px;
    color: #64748b;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: #64748b;
}

.footer-bottom a {
    color: #64748b;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #94a3b8;
    text-decoration: underline;
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text);
    color: #ffffff;
    padding: 14px 28px;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 500;
    z-index: 9999;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: #059669;
}

.toast.error {
    background: #dc2626;
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 40px;
    }

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

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

    .tech-showcase {
        grid-template-columns: 1fr;
    }

    .product-showcase {
        grid-template-columns: 1fr;
    }

    .product-info {
        padding: 32px;
    }

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

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

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

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

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

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

    .hero-title {
        font-size: 32px;
    }

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

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 24px;
    }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(16px);
        padding: 16px 24px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition);
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-list {
        flex-direction: column;
        gap: 8px;
    }

    .nav-link {
        display: block;
        padding: 12px 16px;
    }

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

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

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

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .tech-grid-icons {
        grid-template-columns: repeat(3, 1fr);
    }
}