/* ===== CSS Variables ===== */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-card: #16161f;
    --color-text: #e8e6e3;
    --color-text-muted: #8b8b8b;
    --color-primary: #ff6b35;
    --color-primary-glow: rgba(255, 107, 53, 0.3);
    --color-accent: #00d4aa;
    --color-accent-secondary: #7c3aed;
    --color-border: rgba(255, 255, 255, 0.08);
    --font-serif: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-glow: 0 0 40px var(--color-primary-glow);
}

/* ===== 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-serif);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

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

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

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-medium);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    position: relative;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    transition: var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255, 107, 53, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(124, 58, 237, 0.1), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(0, 212, 170, 0.08), transparent);
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0% { opacity: 1; }
    50% { opacity: 0.8; }
    100% { opacity: 1; }
}

.hero-content {
    position: relative;
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

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

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    opacity: 0.7;
    margin-bottom: 48px;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    background: linear-gradient(135deg, var(--color-primary), #ff8c5a);
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    box-shadow: var(--shadow-glow);
    transition: var(--transition-medium);
    animation: fadeInUp 1s ease-out 0.6s both;
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 50px var(--color-primary-glow);
}

.cta-btn svg {
    transition: var(--transition-fast);
}

.cta-btn:hover svg {
    transform: translateX(5px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease-in-out infinite;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-muted);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    animation: scroll 2s ease-in-out infinite;
}

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

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(8px); }
}

/* ===== Features Section ===== */
.features {
    padding: 120px 0;
    background: var(--color-bg-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 48px 36px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    text-align: center;
    transition: var(--transition-medium);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 107, 53, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    font-weight: 600;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* ===== Articles Section ===== */
.articles {
    padding: 120px 0;
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 64px;
    text-align: center;
}

.title-decoration {
    font-size: 2rem;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.article-card {
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: var(--transition-medium);
}

.article-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.tag {
    padding: 4px 12px;
    background: rgba(0, 212, 170, 0.15);
    color: var(--color-accent);
    border-radius: 20px;
    font-size: 0.8rem;
    font-family: var(--font-mono);
}

.date {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.article-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.read-more {
    display: inline-block;
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.read-more:hover {
    color: var(--color-accent);
    transform: translateX(5px);
}

/* ===== About Section ===== */
.about {
    padding: 120px 0;
    background: var(--color-bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    margin-top: 32px;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--color-text-muted);
}

.about-text strong {
    color: var(--color-text);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 40px;
}

.tech-tag {
    padding: 8px 20px;
    background: rgba(124, 58, 237, 0.15);
    color: var(--color-accent-secondary);
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: 25px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.tech-tag:hover {
    background: rgba(124, 58, 237, 0.25);
    transform: scale(1.05);
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 30px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

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

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
}

.copyright p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.beian a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-family: var(--font-mono);
    transition: var(--transition-fast);
}

.beian a:hover {
    color: var(--color-primary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        gap: 24px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .features, .articles, .about {
        padding: 80px 0;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 48px;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        height: 64px;
    }

    .logo-text {
        display: none;
    }

    .nav-links {
        gap: 16px;
        font-size: 0.9rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .cta-btn {
        padding: 14px 28px;
        font-size: 1rem;
    }

    .feature-card {
        padding: 32px 24px;
    }

    .article-card {
        padding: 24px;
    }
}