:root {
    --primary-dark: #0078D4;
    --primary-mid: #00A0E9;
    --primary-light: #5BC0F8;
    --accent-cyan: #00D4AA;
    --bg-dark: #0A0F1C;
    --bg-card: #111827;
    --bg-elevated: #1A2332;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --border-subtle: rgba(255,255,255,0.08);
    --gradient-hero: linear-gradient(135deg, #0A0F1C 0%, #111827 50%, #0A1628 100%);
    --gradient-accent: linear-gradient(135deg, #0078D4 0%, #00A0E9 50%, #5BC0F8 100%);
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 导航 */
nav {
    position: fixed;
    top: 0; width: 100%;
    padding: 1.25rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 15, 28, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    transition: all 0.3s ease;
}

.logo { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 1.5rem; letter-spacing: -0.5px; }
.logo-icon { width: 40px; height: 40px; position: relative; }
.hex { position: absolute; width: 20px; height: 20px; background: var(--primary-dark); clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%); animation: float 6s ease-in-out infinite; }
.hex:nth-child(1) { top: 0; left: 10px; background: var(--primary-dark); animation-delay: 0s; }
.hex:nth-child(2) { bottom: 0; left: 0; background: var(--primary-light); animation-delay: 0.5s; }
.hex:nth-child(3) { bottom: 0; right: 0; background: var(--primary-mid); animation-delay: 1s; }
@keyframes float { 0%, 100% { transform: translateY(0px); } 50% { transform: translateY(-3px); } }

.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.3s ease; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--gradient-accent); transition: width 0.3s ease; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

/* Hero */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    position: relative;
    background: var(--gradient-hero);
    padding: 8rem 5% 4rem;
    overflow: hidden;
}
.hero-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 120, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 160, 233, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(91, 192, 248, 0.08) 0%, transparent 40%);
    pointer-events: none;
}
.hero-grid {
    position: absolute; width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
    animation: gridMove 20s linear infinite;
}
@keyframes gridMove {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(60px); }
}
.hero-content { max-width: 900px; text-align: center; z-index: 10; position: relative; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 0.5rem 1rem;
    background: rgba(0, 120, 212, 0.1);
    border: 1px solid rgba(0, 120, 212, 0.3);
    border-radius: 50px;
    font-size: 0.85rem; color: var(--primary-light);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease;
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700; line-height: 1.1; margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, #5BC0F8 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    animation: fadeInUp 0.8s ease 0.1s both;
}
.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-secondary); max-width: 720px;
    margin: 0 auto 3rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-highlights {
    display: flex; justify-content: center; gap: 2rem;
    margin-top: 2rem; flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.3s both;
}
.highlight-pill {
    display: flex; align-items: center; gap: 8px;
    padding: 0.6rem 1.2rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-subtle);
    border-radius: 50px;
    font-size: 0.9rem; color: var(--text-secondary);
}
.highlight-pill .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent-cyan); flex-shrink: 0;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Sections通用 */
.section-header { text-align: center; max-width: 700px; margin: 0 auto 4rem; }
.section-tag {
    display: inline-block; padding: 0.4rem 1rem;
    background: rgba(0, 120, 212, 0.1);
    border: 1px solid rgba(0, 120, 212, 0.2);
    border-radius: 50px;
    font-size: 0.8rem; color: var(--primary-light);
    text-transform: uppercase; letter-spacing: 1px;
    margin-bottom: 1rem;
}
.section-title { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; margin-bottom: 1rem; }
.section-desc { color: var(--text-secondary); font-size: 1.1rem; }

/* 核心服务 */
.core-services {
    padding: 6rem 5%;
    background: var(--bg-dark);
    position: relative;
}
.core-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem; max-width: 1200px; margin: 0 auto;
}
.core-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden; cursor: pointer;
}
.core-card::before {
    content: ''; position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.1) 0%, transparent 60%);
    opacity: 0; transition: opacity 0.4s ease;
}
.core-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 120, 212, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
.core-card:hover::before { opacity: 1; }
.core-card.featured {
    border-color: rgba(0, 212, 170, 0.3);
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.05), var(--bg-card));
}
.core-card.featured::before {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1) 0%, transparent 60%);
}
.featured-badge {
    position: absolute; top: 1.2rem; right: 1.2rem;
    padding: 0.25rem 0.8rem;
    background: rgba(0, 212, 170, 0.15);
    border: 1px solid rgba(0, 212, 170, 0.3);
    border-radius: 20px;
    font-size: 0.7rem; color: var(--accent-cyan);
    font-weight: 600; letter-spacing: 0.5px;
}
.core-icon {
    width: 60px; height: 60px;
    background: var(--gradient-accent);
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.5rem; font-size: 1.5rem;
    position: relative; z-index: 1;
}
.core-card.featured .core-icon {
    background: linear-gradient(135deg, #07C160 0%, #00A0E9 100%);
}
.core-card h3 { font-size: 1.4rem; margin-bottom: 0.75rem; position: relative; z-index: 1; }
.core-card > p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; position: relative; z-index: 1; }
.core-meta {
    display: flex; gap: 1rem; margin-top: 1.5rem;
    position: relative; z-index: 1; flex-wrap: wrap;
}
.meta-item {
    display: flex; align-items: center; gap: 6px;
    padding: 0.4rem 0.9rem;
    background: rgba(255,255,255,0.05);
    border-radius: 20px;
    font-size: 0.8rem; color: var(--text-secondary);
}
.core-tags {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    margin-top: 1.2rem;
    position: relative; z-index: 1;
}
.tag {
    padding: 0.3rem 0.8rem;
    background: rgba(255,255,255,0.05);
    border-radius: 20px;
    font-size: 0.75rem; color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

/* 服务流程 */
.process {
    padding: 6rem 5%;
    background: var(--bg-elevated);
}
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem; max-width: 1100px; margin: 0 auto;
}
.process-step {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}
.process-step:hover {
    border-color: rgba(0, 120, 212, 0.3);
    transform: translateY(-4px);
}
.step-num {
    width: 48px; height: 48px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; font-weight: 700;
    margin: 0 auto 1rem;
}
.process-step h4 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.process-step p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.6; }
.process-arrow {
    position: absolute; right: -1.5rem; top: 50%;
    transform: translateY(-50%);
    color: var(--primary-dark);
    font-size: 1.5rem;
    z-index: 10;
}
@media (max-width: 768px) {
    .process-grid { grid-template-columns: 1fr; }
    .process-arrow { display: none; }
}

/* 关于我 */
.about {
    padding: 6rem 5%;
    background: var(--bg-dark);
}
.about-container {
    max-width: 800px; margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 3rem;
}
.about-container h3 { font-size: 1.5rem; margin-bottom: 1.5rem; text-align: center; }
.about-container p { color: var(--text-secondary); font-size: 1rem; line-height: 1.8; margin-bottom: 1rem; }
.about-container strong { color: var(--text-primary); }

/* CTA */
.cta-section {
    padding: 6rem 5%;
    background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-dark) 100%);
    position: relative; overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(0, 120, 212, 0.1) 0%, transparent 70%);
    animation: pulse 10s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}
.cta-container { max-width: 800px; margin: 0 auto; text-align: center; position: relative; z-index: 1; }
.cta-container h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1rem; }
.cta-container p { color: var(--text-secondary); font-size: 1.2rem; margin-bottom: 2.5rem; }
.cta-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn-primary {
    padding: 1rem 2.5rem;
    background: var(--gradient-accent);
    color: white; border: none; border-radius: 12px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    transition: all 0.3s ease;
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 120, 212, 0.4);
}

/* Footer */
footer {
    padding: 3rem 5% 2rem;
    background: var(--bg-dark);
    border-top: 1px solid var(--border-subtle);
}
.footer-content {
    max-width: 1200px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 1rem;
}
.footer-content p { color: var(--text-secondary); font-size: 0.85rem; }
.footer-content a { color: var(--primary-light); text-decoration: none; }

/* Modal */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center;
    z-index: 2000;
    visibility: hidden; opacity: 0;
    transition: visibility 0.25s, opacity 0.3s ease;
}
.modal-overlay.active { visibility: visible; opacity: 1; }
.glass-card {
    background: rgba(20, 28, 40, 0.85);
    backdrop-filter: blur(20px);
    border-radius: 2rem;
    width: 90%; max-width: 480px;
    padding: 2rem 1.8rem 2.2rem;
    box-shadow: 0 30px 50px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255,255,255,0.12) inset;
    text-align: center;
    transform: scale(0.96);
    transition: transform 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    color: #ffffff;
    border: 1px solid rgba(91, 192, 248, 0.3);
}
.modal-overlay.active .glass-card { transform: scale(1); }
.modal-title {
    font-size: 1.8rem; font-weight: 700; margin-bottom: 1rem;
    background: linear-gradient(135deg, #FFF, #5BC0F8);
    background-clip: text; -webkit-background-clip: text; color: transparent;
}
.email-display {
    background: rgba(0, 0, 0, 0.45);
    border-radius: 60px;
    padding: 1rem 0.8rem;
    margin: 1.5rem 0 1.8rem;
    font-size: 1.5rem; font-weight: 500;
    font-family: 'SF Mono', 'Fira Code', monospace;
    letter-spacing: 0.3px; color: #ffffff;
    border: 1px solid rgba(255,255,240,0.25);
    display: flex; align-items: center; justify-content: center;
    gap: 0.6rem; flex-wrap: wrap; word-break: break-all;
}
.email-address {
    background: rgba(0, 120, 212, 0.25);
    padding: 0.2rem 1.2rem;
    border-radius: 48px;
    font-weight: 600; font-size: 1.3rem;
}
.button-group {
    display: flex; gap: 1rem;
    justify-content: center; flex-wrap: wrap;
    margin: 0.8rem 0 0.5rem;
}
.modal-btn {
    border: none; padding: 12px 28px; border-radius: 60px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px); color: white;
    letter-spacing: 0.3px; min-width: 120px;
}
.modal-btn-copy { background: rgba(0, 200, 120, 0.7); border: 1px solid rgba(255,255,210,0.4); }
.modal-btn-copy:hover { background: rgba(0, 220, 140, 0.9); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,200,120,0.35); }
.modal-btn-close { background: rgba(220, 80, 70, 0.7); border: 1px solid rgba(255,220,200,0.4); }
.modal-btn-close:hover { background: rgba(245, 90, 75, 0.9); transform: translateY(-2px); }
.modal-btn:active { transform: translateY(1px); }
.copy-toast {
    position: fixed; bottom: 30px; left: 50%;
    transform: translateX(-50%) scale(0.9);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(16px); color: #eef4ff;
    padding: 12px 28px; border-radius: 60px;
    font-size: 0.95rem; font-weight: 500;
    z-index: 2100; opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none; white-space: nowrap;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    border: 1px solid rgba(91,192,248,0.5);
    letter-spacing: 0.3px;
}
.copy-toast.show { opacity: 1; transform: translateX(-50%) scale(1); }

/* 响应式 */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-highlights { flex-direction: column; align-items: center; }
    .process-grid { grid-template-columns: 1fr; }
    .process-arrow { display: none; }
    .footer-content { flex-direction: column; text-align: center; }
    .glass-card { padding: 1.5rem 1.2rem; }
    .email-address { font-size: 1.1rem; }
    .modal-btn { padding: 8px 20px; min-width: 100px; }
}
@media (max-width: 550px) {
    .email-display { font-size: 1.2rem; }
    .copy-toast { white-space: normal; text-align: center; width: 80%; font-size: 0.85rem; }
}

.fade-in { opacity: 0; transform: translateY(30px); transition: all 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }