/* --------------------------
   Variables & Reset
   -------------------------- */
:root {
    --bg-color: #050505;
    --surface-color: #0f0f0f;
    --border-color: #262626; /* 稍微提亮边框，增加层次 */
    --text-primary: #f2f2f2;
    --text-secondary: #8c8c8c;
    --accent-color: #fff;
    --glow-color: rgba(255, 255, 255, 0.08);
    --tech-green: #00eb79; /* 调整为更有科技感的荧光绿 */
    
    /* 字体栈优化：优先使用 Inter 处理西文，PingFang SC 处理中文 */
    --font-stack: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --transition-speed: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-stack);
    line-height: 1.7; /* 中文行高稍大更易读 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* --------------------------
   Navbar
   -------------------------- */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 80px;
    background: rgba(5, 5, 5, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    user-select: none;
    font-family: 'Inter', monospace; /* Logo 保持英文等宽感 */
}

.logo .dot {
    color: var(--tech-green);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.02em;
}

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

.mobile-menu-icon {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

/* --------------------------
   Buttons
   -------------------------- */
.btn {
    padding: 0.6rem 1.4rem;
    font-size: 0.9rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-speed);
    letter-spacing: 0.03em;
}

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

.btn-line:hover {
    border-color: var(--text-secondary);
    background: var(--surface-color);
}

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

.btn-solid:hover {
    background: #d4d4d4;
    border-color: #d4d4d4;
}

.btn-glow {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    position: relative;
    overflow: hidden;
    padding-right: 1.2rem;
}

.btn-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
    transition: 0.6s;
}

.btn-glow:hover {
    border-color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
}

.btn-glow:hover::before {
    left: 100%;
}

/* --------------------------
   Hero Section
   -------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 60px;
    padding-bottom: 60px;
}

.hero-bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.15;
    z-index: -1;
    mask-image: radial-gradient(circle at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 70%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-family: 'Inter', monospace;
    color: var(--tech-green);
    margin-bottom: 2rem;
    border: 1px solid rgba(0, 235, 121, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    background: rgba(0, 235, 121, 0.05);
    letter-spacing: 0.05em;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.15;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    /* 模拟高级的金属光泽渐变 */
    background: linear-gradient(180deg, #ffffff 20%, #777777 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3.5rem;
    font-weight: 300;
    letter-spacing: 0.02em;
}

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

.input-group {
    display: flex;
    align-items: center;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1rem;
    border-radius: 4px;
    font-family: 'Inter', monospace;
}

.input-group .prefix {
    color: #555;
}

.input-group input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 70px;
    outline: none;
    font-family: inherit;
    font-size: 1rem;
}

/* --------------------------
   Features Section
   -------------------------- */
.features {
    padding: 8rem 0;
    border-top: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--bg-color) 0%, #080808 100%);
}

.section-header {
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-family: 'Inter', sans-serif;
}

.divider {
    height: 1px;
    width: 100%;
    background: linear-gradient(90deg, var(--border-color), transparent);
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: linear-gradient(145deg, var(--surface-color), #0a0a0a);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    transition: transform 0.4s ease, border-color 0.4s ease;
    position: relative;
}

.card:hover {
    transform: translateY(-8px);
    border-color: #333;
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    opacity: 0.9;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* --------------------------
   Interface Preview
   -------------------------- */
.interface-preview {
    padding: 2rem 0 8rem;
    background: var(--bg-color);
}

.preview-box {
    background: #000;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 40px 80px rgba(0,0,0,0.6);
    overflow: hidden;
}

.preview-header {
    background: #0a0a0a;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}

.dot-ui {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    opacity: 0.8;
}
.red { background: #333; }
.yellow { background: #333; }
.green { background: #333; } /* 改为深灰色，更加极客和低调 */

.preview-content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.line-skeleton {
    height: 8px;
    background: #1a1a1a;
    border-radius: 2px;
}

.width-60 { width: 60%; }
.width-80 { width: 80%; }
.width-40 { width: 40%; }

.code-block {
    margin-top: 30px;
    background: #080808;
    border: 1px solid #1f1f1f;
    padding: 24px;
    border-radius: 4px;
    font-family: 'Inter', monospace;
    font-size: 0.85rem;
    color: #a0a0a0;
    position: relative;
    line-height: 1.8;
}

.code-block::before {
    content: 'BASH';
    position: absolute;
    top: -10px;
    right: 15px;
    background: #080808;
    padding: 0 8px;
    font-size: 0.7rem;
    color: var(--tech-green);
    border: 1px solid #1f1f1f;
}

.blur {
    filter: blur(4px);
    user-select: none;
    opacity: 0.5;
}

/* --------------------------
   Footer
   -------------------------- */
footer {
    border-top: 1px solid var(--border-color);
    padding: 4rem 0;
    font-size: 0.9rem;
    background: #020202;
}

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

.footer-col {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.logo-small {
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Inter', monospace;
}

.copyright {
    color: #444;
    font-size: 0.8rem;
}

.links a, .social a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.links a:hover, .social a:hover {
    color: var(--text-primary);
}

/* --------------------------
   Responsive
   -------------------------- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.8rem;
    }
    
    .hero-sub {
        font-size: 1rem;
        margin-bottom: 2.5rem;
        padding: 0 1rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        padding: 0 1rem;
    }

    .input-group, .btn-glow {
        width: 100%;
        justify-content: center;
    }

    .nav-links {
        display: none;
    }

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

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        align-items: flex-start;
    }
    
    .footer-col {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}