/* ============================================
   智创优客 - 企业网站样式
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-soft: #1e293b;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --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-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.25);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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);
    color: var(--gray-700);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

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

/* ---------- 工具类 ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(6,182,212,0.1));
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 40px;
    font-weight: 900;
    color: var(--dark);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 17px;
    color: var(--gray-500);
    line-height: 1.8;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: var(--transition);
    white-space: nowrap;
    font-family: var(--font);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}

.btn-outline {
    border: 2px solid rgba(255,255,255,0.4);
    color: var(--white);
    backdrop-filter: blur(4px);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.7);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 14px;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

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

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    transition: var(--transition);
}

.nav-logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 8px;
    display: block;
}

.navbar.scrolled .nav-logo {
    color: var(--dark);
}

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

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--white);
    background: rgba(255,255,255,0.15);
}

.navbar.scrolled .nav-link {
    color: var(--gray-600);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--primary);
    background: rgba(99,102,241,0.08);
}

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

.navbar.scrolled .btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
}

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

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

.navbar.scrolled .mobile-toggle span {
    background: var(--dark);
}

/* ---------- Hero ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--gradient-dark);
}

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

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(99,102,241,0.25) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 50%, rgba(6,182,212,0.2) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 100%, rgba(99,102,241,0.15) 0%, transparent 50%);
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255,255,255,0.4);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100px) scale(1); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 860px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    color: rgba(255,255,255,0.9);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34,197,94,0.7); }
    50% { opacity: 0.8; box-shadow: 0 0 0 8px rgba(34,197,94,0); }
}

.hero-title {
    font-size: 60px;
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 32px 48px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
}

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

.stat-number {
    font-size: 36px;
    font-weight: 900;
    color: var(--white);
    line-height: 1;
}

.stat-suffix {
    font-size: 20px;
    font-weight: 700;
    color: var(--secondary);
}

.stat-label {
    display: block;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    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: 1px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.4);
    border-bottom: 2px solid rgba(255,255,255,0.4);
    transform: rotate(45deg);
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: rotate(45deg) translate(0,0); opacity: 0.4; }
    50% { transform: rotate(45deg) translate(5px,5px); opacity: 1; }
}

/* ---------- 服务卡片 ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: var(--transition);
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.service-card:hover::before,
.service-card.featured::before {
    transform: scaleX(1);
}

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

.service-card.featured {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.service-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    background: var(--gradient-warm);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.service-icon {
    margin-bottom: 24px;
}

.service-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.service-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    list-style: none;
    margin-bottom: 24px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    font-size: 14px;
    color: var(--gray-600);
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.service-link:hover {
    gap: 10px;
    color: var(--primary-dark);
}

/* ---------- 关于我们 ---------- */
.about {
    background: var(--gray-50);
}

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

.about-text {
    font-size: 16px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-values {
    margin-top: 36px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.value-item:hover {
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

.value-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99,102,241,0.08);
    border-radius: var(--radius);
    flex-shrink: 0;
}

.value-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 2px;
}

.value-item p {
    font-size: 13px;
    color: var(--gray-500);
}

.about-visual {
    position: relative;
}

.about-image-wrapper {
    position: relative;
    height: 480px;
}

.about-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(99,102,241,0.05) 0%, rgba(6,182,212,0.05) 100%);
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--gray-400);
}

.about-float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
}

.about-float-card.card-1 {
    top: 20%;
    left: -20px;
    animation-delay: 0s;
}

.about-float-card.card-2 {
    bottom: 20%;
    right: -20px;
    animation-delay: 1.5s;
}

.float-icon {
    font-size: 24px;
}

.about-float-card strong {
    display: block;
    font-size: 14px;
    color: var(--dark);
}

.about-float-card span {
    font-size: 12px;
    color: var(--gray-500);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* ---------- 案例展示 ---------- */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.case-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-image-text {
    color: rgba(255,255,255,0.9);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 2px;
}

.case-body {
    padding: 28px;
}

.case-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
}

.case-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
    line-height: 1.5;
}

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

.case-metrics {
    display: flex;
    gap: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
}

.metric-value {
    font-size: 22px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    display: block;
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 2px;
}

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

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

.contact-desc {
    font-size: 16px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-top: 16px;
    margin-bottom: 32px;
}

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

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

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

.contact-item h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 15px;
    color: var(--gray-600);
}

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

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 28px;
}

.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: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: var(--font);
    color: var(--dark);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    border-radius: 8px;
    display: block;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    padding: 6px 0;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}

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

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .services-grid,
    .cases-grid {
        grid-template-columns: 1fr 1fr;
    }
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 72px 0;
    }
    .section-title {
        font-size: 30px;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 16px;
    }
    .hero-stats {
        flex-direction: column;
        gap: 20px;
        padding: 24px;
    }
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    .hero-buttons {
        flex-direction: column;
    }
    .services-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius) var(--radius);
    }
    .nav-menu.active {
        display: flex;
    }
    .nav-menu .nav-link {
        color: var(--gray-700);
    }
    .mobile-toggle {
        display: flex;
    }
    .about-image-wrapper {
        height: 320px;
    }
    .about-float-card.card-1 {
        left: 10px;
    }
    .about-float-card.card-2 {
        right: 10px;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    .section-title {
        font-size: 26px;
    }
    .service-card,
    .contact-form-wrapper {
        padding: 28px 20px;
    }
}