/* --- 全局变量与基础设置 --- */
:root {
    --bg-dark: #050505;
    --bg-card: #0a0a0a;
    --neon-green: #39ff14;
    --geek-purple: #bd00ff;
    --text-main: #e0e0e0;
    --text-muted: #888888;
    --glass-bg: rgba(5, 5, 5, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    /* background-color: var(--bg-dark); */
    color: var(--text-main);
    /* 优先使用加载的字体，如果加载失败则回退到系统字体 */
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    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: 40px 40px;
    overflow-x: hidden;
    padding-top: 76px;
}

/* 字体工具类 */
.font-monospace-tech {
    font-family: 'Fira Code', "Consolas", "Monaco", "Courier New", monospace;
}

h1, h2, h3, h4, h5 {
    font-weight: 800;
    letter-spacing: -0.5px;
}

.text-neon { color: var(--neon-green) !important; }
.text-purple { color: var(--geek-purple) !important; }

/* --- 导航栏样式 --- */
.navbar-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0.75rem 0;
}
.navbar-brand {
    font-weight: 800;
    font-family: 'Fira Code', monospace;
    color: #fff !important;
    letter-spacing: -1px;
}
.navbar-brand span {
    color: var(--neon-green);
}
.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 0 0.5rem;
}
.nav-link:hover, .nav-link.active {
    color: var(--neon-green) !important;
}
.btn-nav-cta {
    background: var(--neon-green);
    color: #000;
    font-weight: 700;
    border-radius: 20px;
    padding: 0.4rem 1.2rem;
    transition: all 0.3s;
}
.btn-nav-cta:hover {
    background: #fff;
    box-shadow: 0 0 15px rgba(57, 255, 20, 0.4);
    color: #000;
}
.navbar-toggler {
    border-color: var(--glass-border);
    color: #fff;
}
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* --- 组件样式 --- */
.btn-glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: #fff;
    transition: all 0.3s ease;
}
.btn-glass:hover {
    border-color: var(--neon-green);
    box-shadow: 0 0 15px rgba(57, 255, 20, 0.2);
    color: var(--neon-green);
    background: rgba(57, 255, 20, 0.05);
}

.card-tech {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card-tech:hover {
    transform: translateY(-5px);
    border-color: var(--geek-purple);
    box-shadow: 0 10px 30px -10px rgba(189, 0, 255, 0.3);
}

.accordion-item {
    background-color: transparent;
    border: 1px solid var(--glass-border) !important;
    margin-bottom: 1rem;
    border-radius: 0.5rem !important;
    overflow: hidden;
}
.accordion-button {
    background-color: rgba(255,255,255,0.02);
    color: #fff;
    font-family: 'Fira Code', monospace;
    font-weight: 600;
}
.accordion-button:not(.collapsed) {
    background-color: rgba(57, 255, 20, 0.1);
    color: var(--neon-green);
    box-shadow: none;
}
.accordion-button:focus {
    box-shadow: none;
    border-color: var(--glass-border);
}
.accordion-body {
    background-color: rgba(0,0,0,0.3);
    color: var(--text-muted);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}
.tech-badge {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-family: 'Fira Code', monospace;
    transition: all 0.3s;
}
.tech-badge:hover {
    border-color: var(--neon-green);
    color: var(--neon-green);
    background: rgba(57, 255, 20, 0.1);
}

.section-padding {
    padding: 100px 0;
}
.min-vh-100 {
    min-height: 100vh;
}

.glow-spot {
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(189,0,255,0.15) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    pointer-events: none;
}