/* ===== 全局变量 ===== */
:root {
    --bg-primary: #0d0d1a;
    --bg-secondary: #14142a;
    --bg-card: #1a1a3a;
    --bg-card-alt: #1f1f42;
    --border-color: #2a2a5a;
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0c0;
    --text-muted: #6a6a8a;
    --accent-green: #00ff7f;
    --accent-green-dim: #00cc66;
    --accent-cyan: #00d4ff;
    --accent-red: #ff4d6d;
    --accent-yellow: #ffd700;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 14px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse at 20% 20%, rgba(0, 255, 127, 0.03) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.02) 0%, transparent 60%);
    background-attachment: fixed;
}

::selection {
    background: rgba(0, 255, 127, 0.25);
    color: #fff;
}

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

a:hover {
    color: var(--accent-cyan);
    text-decoration: underline;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== 顶部导航 ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(13, 13, 26, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    z-index: 1000;
    padding: 0.8rem 1.5rem;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--accent-green);
    font-size: 1.6rem;
}

.logo .highlight {
    color: var(--accent-green);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    padding: 0.3rem 0;
}

.nav-link:hover {
    color: var(--accent-green);
    text-decoration: none;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0.3rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(13, 13, 26, 0.95);
        flex-direction: column;
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--border-color);
        gap: 1.2rem;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 3rem;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 740px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero h1 .highlight {
    color: var(--accent-green);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.badge-warning {
    display: inline-block;
    margin-top: 0.6rem;
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.2);
    color: var(--accent-yellow);
    padding: 0.3rem 1rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green-dim), var(--accent-green));
    color: #0d0d1a;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 255, 127, 0.25);
    text-decoration: none;
    color: #0d0d1a;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    border-color: var(--accent-green);
    color: var(--accent-green);
    transform: translateY(-3px);
    text-decoration: none;
}

.hero-decoration {
    position: absolute;
    right: 5%;
    bottom: 10%;
    font-size: 3rem;
    color: rgba(0, 255, 127, 0.06);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    pointer-events: none;
}

@media (max-width: 640px) {
    .hero-decoration {
        display: none;
    }
}

/* ===== 通用 Section ===== */
.section {
    padding: 5rem 1.5rem;
}

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

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 3rem;
    font-size: 1.8rem;
    font-weight: 600;
}

.section-header i {
    color: var(--accent-green);
    font-size: 1.6rem;
}

.section-header h2 {
    font-size: 1.8rem;
    letter-spacing: -0.5px;
}

@media (max-width: 640px) {
    .section-header {
        font-size: 1.4rem;
    }
    .section-header h2 {
        font-size: 1.4rem;
    }
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.about-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.about-card:hover {
    border-color: rgba(0, 255, 127, 0.15);
    transform: translateY(-4px);
}

.about-card i {
    font-size: 2rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.about-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
}

.about-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Services ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.2rem;
}

.service-item {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    padding: 1.5rem 1.2rem;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.service-item:hover {
    border-color: var(--accent-green);
    box-shadow: 0 0 16px rgba(0, 255, 127, 0.06);
    transform: translateY(-3px);
}

.service-item i {
    font-size: 2rem;
    color: var(--accent-green);
    margin-bottom: 0.8rem;
}

.service-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.service-item p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ===== Process ===== */
.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.step {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--accent-green);
    color: #0d0d1a;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin: 0 auto 1rem;
}

.step h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.step code {
    background: rgba(0, 255, 127, 0.08);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
}

.process-note {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    justify-content: center;
    background: rgba(0, 255, 127, 0.05);
    border: 1px solid rgba(0, 255, 127, 0.08);
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.process-note i {
    color: var(--accent-yellow);
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.contact-item:hover {
    border-color: rgba(0, 255, 127, 0.15);
}

.contact-item i {
    font-size: 2rem;
    color: var(--accent-cyan);
    margin-bottom: 0.8rem;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.contact-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-green);
    word-break: break-all;
}

.contact-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.contact-warning {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    background: rgba(255, 77, 109, 0.06);
    border: 1px solid rgba(255, 77, 109, 0.12);
    padding: 1rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.contact-warning i {
    color: var(--accent-red);
    font-size: 1.2rem;
    margin-top: 2px;
}

.contact-warning strong {
    color: var(--accent-red);
}

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.footer-inner strong {
    color: var(--text-secondary);
}

.footer-tech {
    margin-top: 0.4rem;
    font-size: 0.8rem;
}

.footer-extra {
    margin-top: 0.6rem;
    font-size: 0.75rem;
    opacity: 0.6;
}

.footer-tech .sep {
    margin: 0 0.5rem;
    opacity: 0.3;
}