/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 科技蓝紫色主题 */
    --primary-color: #00d4ff;
    --secondary-color: #6b5ce7;
    --accent-color: #00ffaa;
    --bg-dark: #0a0e27;
    --bg-darker: #060920;
    --surface: rgba(15, 23, 42, 0.7);
    --surface-light: rgba(30, 41, 59, 0.5);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #00ffaa 100%);
    --gradient-hero: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glow: 0 0 20px rgba(0, 212, 255, 0.5);

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==================== 背景动画 ==================== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    animation: float 20s infinite ease-in-out;
    opacity: 0.3;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--primary-color), transparent);
    top: -200px;
    left: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--secondary-color), transparent);
    bottom: -300px;
    right: -300px;
    animation-delay: 5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-color), transparent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    33% {
        transform: translate(50px, -50px);
    }
    66% {
        transform: translate(-50px, 50px);
    }
}

/* ==================== Hero Section ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 0;
    position: relative;
}

.hero-content {
    max-width: 900px;
}

.logo-large {
    margin-bottom: 1.5rem;
    animation: pulse-glow 3s infinite;
}

.hero-logo-img {
    height: 80px;
    object-fit: contain;
    mix-blend-mode: screen;
}

@keyframes pulse-glow {
    0%, 100% {
        filter: drop-shadow(0 0 20px var(--primary-color));
        transform: scale(1);
    }
    50% {
        filter: drop-shadow(0 0 40px var(--primary-color));
        transform: scale(1.05);
    }
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title .highlight {
    color: var(--accent-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.btn-primary,
.btn-secondary {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--bg-dark);
    box-shadow: var(--glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.8);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 2px solid var(--surface-light);
}

.btn-secondary:hover {
    background: var(--surface-light);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.3rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.stat-item {
    padding: 1.5rem;
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ==================== Section Headers ==================== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ==================== Workflow Section ==================== */
.workflow {
    padding: 6rem 0;
    background: linear-gradient(180deg, transparent 0%, var(--bg-darker) 50%, transparent 100%);
}

.workflow-diagram {
    max-width: 900px;
    margin: 0 auto;
}

.workflow-step {
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 2rem;
    align-items: center;
    transition: var(--transition);
}

.workflow-step:hover {
    transform: translateX(10px);
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
}

.step-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-accent);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--bg-dark);
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.step-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(0, 212, 255, 0.2);
    border: 1px solid var(--primary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    margin-right: 0.5rem;
    margin-top: 0.5rem;
}

.step-formula {
    background: var(--bg-darker);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-color);
    margin: 1rem 0;
}

.step-formula code {
    color: var(--accent-color);
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
}

.step-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.tag {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.tag.group-1 {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--success);
    color: var(--success);
}

.tag.group-2 {
    background: rgba(245, 158, 11, 0.2);
    border: 1px solid var(--warning);
    color: var(--warning);
}

.tag.group-3 {
    background: rgba(0, 212, 255, 0.2);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.step-channels {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.channel {
    background: var(--bg-darker);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.channel i {
    color: var(--accent-color);
    font-size: 1.3rem;
}

.step-image-placeholder {
    width: 220px;
    height: 165px;
    background: var(--bg-darker);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.workflow-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    position: relative;
    z-index: 1;
}

/* 图片加载后隐藏占位符文字 */
.step-image-placeholder:has(img[src]) {
    border-style: solid;
}

.step-image-placeholder::after {
    content: "";
    position: absolute;
    color: var(--text-secondary);
    font-size: 0.9rem;
    z-index: 0;
}

.workflow-arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-color);
    margin: 1rem 0;
    animation: bounce 2s infinite;
}

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

/* ==================== Features Section ==================== */
.features {
    padding: 6rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.3);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-accent);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--bg-dark);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.feature-list i {
    color: var(--accent-color);
    font-size: 0.9rem;
}

/* ==================== Tech Stack Section ==================== */
.tech-stack {
    padding: 6rem 0;
    background: linear-gradient(180deg, transparent 0%, var(--bg-darker) 50%, transparent 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.tech-category {
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tech-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-item {
    background: var(--bg-darker);
    padding: 0.75rem 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.tech-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

/* ==================== CTA Section ==================== */
.cta {
    padding: 6rem 0;
}

.cta-content {
    background: var(--gradient-primary);
    padding: 4rem;
    border-radius: 32px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-content::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: white;
    position: relative;
    z-index: 1;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    z-index: 1;
}

.cta-content .btn-primary {
    background: white;
    color: var(--secondary-color);
    position: relative;
    z-index: 1;
}

.cta-content .btn-primary:hover {
    background: var(--bg-dark);
    color: var(--primary-color);
}

/* ==================== Footer ==================== */
.footer {
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.footer-logo-img {
    height: 28px;
    object-fit: contain;
    mix-blend-mode: screen;
}

.footer-logo i {
    font-size: 1.5rem;
}

.footer-info {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-citation {
    margin-top: 0.4rem;
    font-size: 0.85rem;
}

.footer-citation a {
    color: var(--primary-color);
    text-decoration: none;
    transition: opacity 0.2s;
    font-style: italic;
}

.footer-citation a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.divider {
    margin: 0 0.75rem;
}

/* ==================== Lightbox 图片放大 ==================== */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease-out;
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.lightbox-content {
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 10px 60px rgba(0, 212, 255, 0.5);
    animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.lightbox-close {
    position: absolute;
    top: 30px;
    right: 50px;
    color: var(--text-primary);
    font-size: 50px;
    font-weight: 300;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10000;
}

.lightbox-close:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

.lightbox-caption {
    margin-top: 2rem;
    color: var(--text-primary);
    font-size: 1.1rem;
    text-align: center;
    padding: 1rem 2rem;
    background: rgba(15, 23, 42, 0.8);
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.3);
}

/* 图片可点击提示 */
.workflow-image {
    cursor: zoom-in;
    transition: var(--transition);
}

.workflow-image:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

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

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .workflow-step {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .step-image-placeholder {
        margin: 0 auto;
    }

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

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

    .cta-content {
        padding: 2rem;
    }

    .cta-content h2 {
        font-size: 1.8rem;
    }

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

    /* Lightbox 移动端优化 */
    .lightbox-close {
        top: 20px;
        right: 20px;
        font-size: 40px;
    }

    .lightbox-content {
        max-width: 95%;
        max-height: 80vh;
    }

    .lightbox-caption {
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
        margin: 1rem;
    }
}

/* ==================== 平滑滚动 ==================== */
html {
    scroll-behavior: smooth;
}

/* ==================== 加载动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.workflow-step,
.feature-card,
.tech-category {
    animation: fadeIn 0.6s ease-out;
}

/* ==================== Language Toggle Button ==================== */
.lang-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    padding: 8px 18px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #00d4ff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.5px;
}

.lang-toggle:hover {
    background: rgba(0, 212, 255, 0.15);
    border-color: rgba(0, 212, 255, 0.6);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .lang-toggle {
        top: 10px;
        right: 10px;
        padding: 6px 14px;
        font-size: 12px;
    }
}