/* ==========================================
   极限技术知识分享 - 赛博朋克风格 v3.0
   ========================================== */

:root {
    --primary: #00f0ff;
    --primary-dim: rgba(0, 240, 255, 0.15);
    --secondary: #ff00ff;
    --tertiary: #ffff00;
    --quaternary: #00ff88;
    --bg-dark: #0a0a0f;
    --bg-card: rgba(15, 15, 25, 0.7);
    --bg-card-hover: rgba(25, 25, 45, 0.85);
    --text: #e0e0e0;
    --text-dim: #888;
    --glow-primary: 0 0 10px rgba(0, 240, 255, 0.5), 0 0 20px rgba(0, 240, 255, 0.3);
    --gradient-1: linear-gradient(135deg, #00f0ff, #0066ff);
    --gradient-2: linear-gradient(135deg, #ff00ff, #ff0066);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Noto Sans SC', sans-serif;
    --font-code: 'Fira Code', monospace;
    --radius: 12px;
    --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-body);
    background: var(--bg-dark);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ==========================================
   动态背景
   ========================================== */
.bg-grid {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-image: linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -2; animation: gridMove 20s linear infinite;
}
@keyframes gridMove { 0% { transform: translateY(0); } 100% { transform: translateY(40px); } }

.bg-glow {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(ellipse at 20% 50%, rgba(0, 240, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(255, 0, 255, 0.06) 0%, transparent 50%);
    z-index: -1; animation: glowPulse 8s ease-in-out infinite alternate;
}
@keyframes glowPulse { 0% { opacity: 0.5; } 100% { opacity: 1; } }

/* ==========================================
   通用容器
   ========================================== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; width: 100%; }

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 12px 0; transition: all 0.3s ease;
    background: rgba(10, 10, 15, 0.85); backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 240, 255, 0.1);
}
.navbar.scrolled { padding: 8px 0; background: rgba(10, 10, 15, 0.95); border-bottom-color: rgba(0, 240, 255, 0.3); box-shadow: 0 5px 30px rgba(0,0,0,0.5); }

.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; color: #fff; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; }
.logo-icon { color: var(--primary); font-size: 1.3rem; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.15); } }

.logo-highlight { background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.nav-links { display: flex; gap: 20px; }
.nav-link { text-decoration: none; color: var(--text-dim); font-weight: 500; font-size: 0.85rem; position: relative; transition: color 0.3s ease; display: flex; align-items: center; gap: 5px; }
.nav-link::after { content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 2px; background: var(--gradient-1); transition: width 0.3s ease; }
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.mobile-toggle {
    display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 5px; z-index: 1001;
}
.mobile-toggle span { display: block; width: 24px; height: 2px; background: var(--primary); transition: all 0.3s ease; border-radius: 2px; }
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ==========================================
   英雄区域
   ========================================== */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 16px 60px;
    width: 100%;
}

.hero-badge { display: inline-flex; align-items: center; gap: 6px; padding: 5px 14px; background: rgba(0, 240, 255, 0.1); border: 1px solid rgba(0, 240, 255, 0.3); border-radius: 20px; font-size: 0.8rem; color: var(--primary); margin-bottom: 18px; }
.hero-title { font-family: var(--font-display); font-size: 3.5rem; font-weight: 900; line-height: 1.1; margin-bottom: 18px; }
.glitch { display: block; position: relative; color: #fff; text-shadow: 0 0 20px rgba(0, 240, 255, 0.5); animation: glitchText 3s infinite; }
.glitch:nth-child(2) { background: var(--gradient-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; animation-delay: 0.5s; }
@keyframes glitchText { 0%, 100% { transform: translate(0); } 20% { transform: translate(-2px, 2px); } 40% { transform: translate(2px, -2px); } 60% { transform: translate(-1px, -1px); } 80% { transform: translate(1px, 1px); } }

.hero-subtitle { font-size: 1.2rem; color: var(--primary); margin-bottom: 8px; font-weight: 500; }
.hero-desc { font-size: 0.95rem; color: var(--text-dim); margin-bottom: 25px; max-width: 500px; line-height: 1.7; }
.hero-actions { display: flex; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; border-radius: 8px; text-decoration: none; font-weight: 600; font-size: 0.95rem; transition: all 0.3s ease; cursor: pointer; border: none; font-family: var(--font-body); }
.btn-primary { background: var(--gradient-1); color: #000; box-shadow: var(--glow-primary); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 20px rgba(0, 240, 255, 0.7), 0 0 40px rgba(0, 240, 255, 0.4); }
.btn-secondary { background: transparent; color: var(--primary); border: 1px solid rgba(0, 240, 255, 0.4); }
.btn-secondary:hover { background: rgba(0, 240, 255, 0.1); border-color: var(--primary); transform: translateY(-3px); }

.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat-item { text-align: center; padding: 14px 8px; background: var(--bg-card); border-radius: var(--radius); border: 1px solid rgba(0, 240, 255, 0.15); backdrop-filter: blur(10px); transition: all 0.3s ease; }
.stat-item:hover { border-color: var(--primary); box-shadow: var(--glow-primary); transform: translateY(-5px); }
.stat-number { display: block; font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 0.75rem; color: var(--text-dim); }

/* 代码窗口 */
.hero-visual { display: flex; justify-content: center; }
.code-window { width: 100%; max-width: 480px; background: rgba(15, 15, 25, 0.9); border-radius: var(--radius); border: 1px solid rgba(0, 240, 255, 0.2); overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.5); backdrop-filter: blur(20px); }
.code-header { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: rgba(0,0,0,0.3); border-bottom: 1px solid rgba(0, 240, 255, 0.1); }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.red { background: #ff5f56; } .dot.yellow { background: #ffbd2e; } .dot.green { background: #27ca40; }
.code-title { margin-left: 8px; font-family: var(--font-code); font-size: 0.8rem; color: var(--text-dim); flex: 1; }

.copy-btn { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); color: var(--text-dim); padding: 4px 10px; border-radius: 5px; font-size: 0.7rem; cursor: pointer; transition: all 0.3s ease; display: flex; align-items: center; gap: 4px; font-family: var(--font-body); }
.copy-btn:hover { background: rgba(0, 240, 255, 0.15); border-color: var(--primary); color: var(--primary); }
.copy-btn.copied { background: rgba(0, 255, 136, 0.15); border-color: var(--quaternary); color: var(--quaternary); }

.hero-code { padding: 16px !important; margin: 0 !important; background: transparent !important; font-family: var(--font-code) !important; font-size: 0.8rem !important; line-height: 1.6 !important; overflow-x: auto; }

/* ==========================================
   Section 通用
   ========================================== */
section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-title { font-family: var(--font-display); font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; }
.section-title .highlight { background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-subtitle { color: var(--text-dim); font-size: 1rem; }

/* ==========================================
   编程语言卡片
   ========================================== */
.lang-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.lang-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 28px 20px; text-align: center; border: 1px solid rgba(255,255,255,0.05); backdrop-filter: blur(10px); cursor: pointer; transition: all 0.4s ease; position: relative; overflow: hidden; }
.lang-card::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent); transition: left 0.6s ease; }
.lang-card:hover::before { left: 100%; }
.lang-card:hover { transform: translateY(-10px); background: var(--bg-card-hover); }
.lang-card.active { border-color: var(--primary); box-shadow: var(--glow-primary); }
.lang-card[data-lang="java"]:hover, .lang-card[data-lang="java"].active { border-color: #f89820; box-shadow: 0 0 20px rgba(248,152,32,0.4); }
.lang-card[data-lang="c"]:hover, .lang-card[data-lang="c"].active { border-color: #a8b9cc; box-shadow: 0 0 20px rgba(168,185,204,0.4); }
.lang-card[data-lang="cpp"]:hover, .lang-card[data-lang="cpp"].active { border-color: #00599c; box-shadow: 0 0 20px rgba(0,89,156,0.4); }
.lang-card[data-lang="go"]:hover, .lang-card[data-lang="go"].active { border-color: #00add8; box-shadow: 0 0 20px rgba(0,173,216,0.4); }
.lang-card[data-lang="iapp"]:hover, .lang-card[data-lang="iapp"].active { border-color: #ff6b35; box-shadow: 0 0 20px rgba(255,107,53,0.4); }
.lang-card[data-lang="lua"]:hover, .lang-card[data-lang="lua"].active { border-color: #000080; box-shadow: 0 0 20px rgba(0,0,128,0.4); }

.lang-icon { font-size: 2.8rem; margin-bottom: 12px; color: #fff; }
.lang-icon .fa-java { color: #f89820; } .lang-icon .fa-copyright { color: #a8b9cc; } .lang-icon .fa-code { color: #00599c; } .lang-icon .fa-golang { color: #00add8; } .lang-icon .fa-language { color: #ff6b35; } .lang-icon .fa-moon { color: #000080; }

.lang-card h3 { font-size: 1.4rem; margin-bottom: 8px; color: #fff; }
.lang-card p { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 12px; }
.lang-tags { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.lang-tags span { padding: 3px 10px; background: rgba(255,255,255,0.05); border-radius: 15px; font-size: 0.7rem; color: var(--text-dim); border: 1px solid rgba(255,255,255,0.1); }

/* ==========================================
   语法教学
   ========================================== */
.syntax-tabs { display: flex; gap: 10px; margin-bottom: 25px; flex-wrap: wrap; justify-content: center; }
.syntax-tab { padding: 10px 20px; background: rgba(15,15,25,0.7); border: 1px solid rgba(255,255,255,0.1); border-radius: 8px; color: var(--text-dim); font-size: 0.9rem; cursor: pointer; transition: all 0.3s ease; display: flex; align-items: center; gap: 8px; font-family: var(--font-body); }
.syntax-tab:hover { border-color: rgba(0, 240, 255, 0.3); color: var(--text); }
.syntax-tab.active { border-color: var(--primary); background: rgba(0, 240, 255, 0.1); color: var(--primary); box-shadow: var(--glow-primary); }

.syntax-content { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid rgba(255,255,255,0.05); backdrop-filter: blur(10px); overflow: hidden; }
.syntax-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.syntax-table th, .syntax-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(255,255,255,0.05); }
.syntax-table th { background: rgba(0, 240, 255, 0.05); color: var(--primary); font-weight: 600; font-family: var(--font-display); font-size: 0.8rem; white-space: nowrap; }
.syntax-table tr:last-child td { border-bottom: none; }
.syntax-table tr:hover { background: rgba(0, 240, 255, 0.03); }
.syntax-table td { color: var(--text); font-family: var(--font-code); font-size: 0.8rem; }
.syntax-table td:first-child { color: var(--text-dim); font-family: var(--font-body); font-weight: 500; }
.syntax-table code { background: rgba(0, 240, 255, 0.08); padding: 2px 6px; border-radius: 4px; font-family: var(--font-code); font-size: 0.75rem; color: var(--primary); }
.syntax-note { background: rgba(0, 240, 255, 0.05); border-left: 3px solid var(--primary); padding: 14px 18px; margin-top: 18px; font-size: 0.85rem; color: var(--text-dim); line-height: 1.7; }
.syntax-note i { color: var(--primary); margin-right: 8px; }

/* ==========================================
   知识点区域
   ========================================== */
.knowledge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }
.knowledge-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px; border: 1px solid rgba(255,255,255,0.05); backdrop-filter: blur(10px); transition: all 0.4s ease; cursor: pointer; position: relative; overflow: hidden; }
.knowledge-card::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--gradient-1); transform: scaleX(0); transition: transform 0.4s ease; }
.knowledge-card:hover::after { transform: scaleX(1); }
.knowledge-card:hover { transform: translateY(-8px); background: var(--bg-card-hover); border-color: rgba(0, 240, 255, 0.3); box-shadow: 0 15px 40px rgba(0,0,0,0.3); }

.knowledge-card .card-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.knowledge-card .card-icon { width: 38px; height: 38px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; background: rgba(0, 240, 255, 0.1); border: 1px solid rgba(0, 240, 255, 0.2); }
.knowledge-card h3 { font-size: 1.1rem; color: #fff; margin-bottom: 6px; }
.knowledge-card p { color: var(--text-dim); font-size: 0.82rem; margin-bottom: 15px; line-height: 1.6; }
.knowledge-card .card-footer { display: flex; align-items: center; justify-content: space-between; }
.knowledge-card .difficulty { display: flex; gap: 3px; }
.knowledge-card .difficulty span { width: 7px; height: 7px; border-radius: 50%; background: rgba(255,255,255,0.1); }
.knowledge-card .difficulty span.filled { background: var(--primary); box-shadow: 0 0 5px var(--primary); }
.knowledge-card .view-code { color: var(--primary); font-size: 0.8rem; display: flex; align-items: center; gap: 5px; transition: gap 0.3s ease; }
.knowledge-card:hover .view-code { gap: 10px; }

/* ==========================================
   弹窗
   ========================================== */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); backdrop-filter: blur(10px); z-index: 10000; display: flex; align-items: center; justify-content: center; padding: 16px; opacity: 0; visibility: hidden; transition: all 0.3s ease; }
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal { width: 100%; max-width: 750px; max-height: 85vh; background: rgba(15,15,25,0.95); border-radius: var(--radius-lg); border: 1px solid rgba(0, 240, 255, 0.3); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,0.7), 0 0 40px rgba(0, 240, 255, 0.1); transform: scale(0.9) translateY(20px); transition: transform 0.3s ease; }
.modal-overlay.active .modal { transform: scale(1) translateY(0); }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid rgba(0, 240, 255, 0.15); }
.modal-title { font-family: var(--font-display); font-size: 1.1rem; color: #fff; }
.modal-close { width: 35px; height: 35px; border-radius: 50%; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); color: var(--text-dim); font-size: 1.3rem; cursor: pointer; transition: all 0.3s ease; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { background: rgba(255,0,0,0.2); border-color: #ff0000; color: #ff0000; }
.modal-body { padding: 20px; max-height: calc(85vh - 70px); overflow-y: auto; }
.modal-desc { color: var(--text-dim); margin-bottom: 18px; font-size: 0.9rem; }
.modal-code { margin-bottom: 18px; max-height: 350px; overflow-y: auto; }
.modal-code pre { margin: 0 !important; border-radius: 0 0 8px 8px !important; font-size: 0.8rem !important; line-height: 1.6 !important; padding: 16px !important; }
.modal-analysis { background: rgba(0, 240, 255, 0.05); border: 1px solid rgba(0, 240, 255, 0.15); border-radius: 10px; padding: 16px; }
.modal-analysis h4 { color: var(--primary); margin-bottom: 8px; font-size: 0.9rem; display: flex; align-items: center; gap: 8px; }
.modal-analysis p { color: var(--text-dim); font-size: 0.82rem; line-height: 1.7; }

/* ==========================================
   关于区域
   ========================================== */
.about-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.about-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 28px 20px; text-align: center; border: 1px solid rgba(255,255,255,0.05); backdrop-filter: blur(10px); transition: all 0.4s ease; }
.about-card:hover { transform: translateY(-10px); border-color: var(--primary); box-shadow: var(--glow-primary); }
.about-icon { font-size: 2.2rem; margin-bottom: 14px; color: var(--primary); filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.3)); }
.about-card h3 { font-size: 1.1rem; color: #fff; margin-bottom: 8px; }
.about-card p { color: var(--text-dim); font-size: 0.82rem; line-height: 1.7; }

/* ==========================================
   页脚
   ========================================== */
.footer { padding: 50px 0 35px; border-top: 1px solid rgba(0, 240, 255, 0.1); background: rgba(10,10,15,0.5); backdrop-filter: blur(20px); }
.footer-content { text-align: center; margin-bottom: 20px; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 8px; margin-bottom: 10px; font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; color: #fff; }
.footer-brand i { color: var(--primary); }
.footer-desc { color: var(--text-dim); font-size: 0.85rem; }
.footer-links { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); text-decoration: none; font-size: 0.85rem; transition: color 0.3s ease; }
.footer-links a:hover { color: var(--primary); }
.footer-beian { text-align: center; margin-bottom: 18px; }
.beian-link { display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; background: rgba(0, 240, 255, 0.08); border: 1px solid rgba(0, 240, 255, 0.3); border-radius: 30px; text-decoration: none; color: var(--primary); font-weight: 600; font-size: 0.9rem; transition: all 0.3s ease; box-shadow: 0 0 15px rgba(0, 240, 255, 0.15); animation: beianGlow 2s ease-in-out infinite alternate; }
.beian-link:hover { background: rgba(0, 240, 255, 0.15); border-color: var(--primary); box-shadow: 0 0 25px rgba(0, 240, 255, 0.4); transform: scale(1.05); }
@keyframes beianGlow { 0% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.15); } 100% { box-shadow: 0 0 25px rgba(0, 240, 255, 0.35); } }
.footer-copyright { text-align: center; color: var(--text-dim); font-size: 0.8rem; }

/* ==========================================
   代码高亮自定义
   ========================================== */
code[class*="language-"], pre[class*="language-"] { font-family: var(--font-code) !important; font-size: 0.8rem; text-shadow: none !important; }
.token.comment { color: #6a9955 !important; }
.token.punctuation { color: #d4d4d4 !important; }
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol, .token.deleted { color: #b5cea8 !important; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin, .token.inserted { color: #ce9178 !important; }
.token.operator, .token.entity, .token.url { color: #d4d4d4 !important; }
.token.atrule, .token.attr-value, .token.keyword { color: #569cd6 !important; }
.token.function, .token.class-name { color: #4ec9b0 !important; }
.token.regex, .token.important, .token.variable { color: #d16969 !important; }

/* ==========================================
   滚动条美化
   ========================================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: rgba(0, 240, 255, 0.3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 240, 255, 0.5); }

/* ==========================================
   动画类
   ========================================== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.reduced-motion * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
.reduced-motion .bg-grid, .reduced-motion .bg-glow, .reduced-motion .glitch { animation: none !important; }
.touch-device .lang-card:hover, .touch-device .knowledge-card:hover, .touch-device .about-card:hover { transform: none !important; box-shadow: none !important; }
.touch-device .lang-card.hover, .touch-device .knowledge-card.hover, .touch-device .about-card.hover { transform: translateY(-5px) !important; box-shadow: 0 10px 30px rgba(0,0,0,0.3) !important; }
.touch-device .btn:hover { transform: none !important; }
.touch-device .btn:active { transform: scale(0.95) !important; }
.lang-card.touching, .knowledge-card.touching { transform: scale(0.97) !important; transition: transform 0.1s ease !important; }

/* ==========================================================================
   RESPONSIVE - 移动优先重写（关键部分）
   ========================================================================== */

/* 默认就是手机端样式（移动优先），然后通过 min-width 媒体查询逐步增强到桌面端 */

/* ==========================================
   大屏：1400px+
   ========================================== */
@media (min-width: 1400px) {
    .container { max-width: 1400px; padding: 0 40px; }
    .hero-title { font-size: 5rem; }
    .hero-subtitle { font-size: 1.4rem; }
    .lang-grid { grid-template-columns: repeat(4, 1fr); gap: 30px; }
    .knowledge-grid { grid-template-columns: repeat(3, 1fr); }
    .about-grid { grid-template-columns: repeat(4, 1fr); gap: 30px; }
    .code-window { max-width: 550px; }
    .stat-number { font-size: 2.2rem; }
    .hero { padding: 140px 40px 100px; }
    section { padding: 120px 0; }
}

/* ==========================================
   平板：768px - 1400px
   ========================================== */
@media (min-width: 600px) and (max-width: 1399px) {
    .container { max-width: 1000px; padding: 0 24px; }
    .hero { padding: 120px 24px 80px; grid-template-columns: 1fr 1fr; gap: 40px; }
    .hero-title { font-size: 3rem; }
    .hero-subtitle { font-size: 1.15rem; }
    .hero-stats { grid-template-columns: repeat(4, 1fr); }
    .code-window { max-width: 420px; }
    .lang-grid { grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .knowledge-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .about-grid { grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .section-title { font-size: 2rem; }
    .nav-links { gap: 18px; }
    .nav-link { font-size: 0.82rem; }
    .stat-number { font-size: 1.5rem; }
}

/* ==========================================
   手机端：0 - 600px（关键修复区域）
   ========================================== */
@media (max-width: 600px) {
    /* === 全局 === */
    section { padding: 60px 0; }
    .container { padding: 0 14px; }
    
    /* === 导航栏 === */
    .navbar { padding: 10px 0; }
    .nav-container { padding: 0 14px; }
    .logo { font-size: 1.1rem; }
    .logo-icon { font-size: 1.2rem; }
    
    /* 全屏导航菜单 */
    .nav-links {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        flex-direction: column; align-items: center; justify-content: center;
        gap: 0; background: rgba(10, 10, 15, 0.98); backdrop-filter: blur(20px);
        padding: 20px; transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1); z-index: 999;
    }
    .nav-links.active { transform: translateX(0); }
    .nav-link {
        padding: 16px 0; width: 100%; text-align: center; font-size: 1.1rem;
        border-bottom: 1px solid rgba(255,255,255,0.03);
    }
    .nav-link::after { display: none; }
    .mobile-toggle { display: flex; }
    
    /* === 英雄区域 - 手机端单列布局 === */
    .hero {
        min-height: auto;
        padding: 85px 14px 45px;
        grid-template-columns: 1fr; /* 单列！ */
        gap: 20px;
        text-align: center;
    }
    .hero-badge { font-size: 0.75rem; padding: 5px 12px; margin-bottom: 12px; }
    .hero-title { font-size: 2rem; margin-bottom: 12px; }
    .hero-subtitle { font-size: 0.95rem; margin-bottom: 6px; }
    .hero-desc {
        font-size: 0.82rem; margin: 0 auto 18px; max-width: 100%; line-height: 1.6;
    }
    .hero-actions {
        flex-direction: column; align-items: center; gap: 8px; margin-bottom: 22px;
    }
    .btn {
        width: 100%; max-width: 250px; justify-content: center;
        padding: 11px 18px; font-size: 0.88rem;
    }
    
    /* 统计 - 2列 */
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat-item { padding: 12px 6px; }
    .stat-number { font-size: 1.3rem; }
    .stat-label { font-size: 0.68rem; }
    
    /* 代码窗口 - 缩小 */
    .hero-visual { order: 0; }
    .code-window { max-width: 100%; }
    .hero-code {
        font-size: 0.68rem !important; padding: 10px !important; line-height: 1.4 !important;
    }
    .code-header { padding: 8px 10px; }
    .code-title { font-size: 0.65rem; }
    .dot { width: 9px; height: 9px; }
    
    /* === Section标题 === */
    .section-header { margin-bottom: 35px; }
    .section-title { font-size: 1.7rem; }
    .section-subtitle { font-size: 0.85rem; }
    
    /* === 语言卡片 - 2列紧凑 === */
    .lang-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .lang-card { padding: 18px 12px; }
    .lang-icon { font-size: 2rem; margin-bottom: 8px; }
    .lang-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
    .lang-card p { font-size: 0.72rem; margin-bottom: 8px; }
    .lang-tags { gap: 4px; }
    .lang-tags span { padding: 2px 7px; font-size: 0.62rem; }
    
    /* === 语法教学 - Tab滚动 + 表格滚动 === */
    .syntax-tabs {
        flex-wrap: nowrap; overflow-x: auto; justify-content: flex-start;
        gap: 6px; padding-bottom: 6px; -webkit-overflow-scrolling: touch;
    }
    .syntax-tabs::-webkit-scrollbar { display: none; }
    .syntax-tab {
        flex-shrink: 0; padding: 8px 12px; font-size: 0.78rem; white-space: nowrap;
    }
    .syntax-table { display: block; overflow-x: auto; }
    .syntax-table th, .syntax-table td {
        padding: 8px 10px; font-size: 0.72rem; white-space: nowrap;
    }
    .syntax-note { padding: 12px 14px; font-size: 0.78rem; margin-top: 14px; }
    
    /* === 知识点卡片 - 单列 === */
    .knowledge-grid { grid-template-columns: 1fr; gap: 14px; }
    .knowledge-card { padding: 16px 14px; }
    .knowledge-card .card-header { gap: 8px; margin-bottom: 8px; }
    .knowledge-card .card-icon {
        width: 32px; height: 32px; font-size: 0.9rem; border-radius: 6px;
    }
    .knowledge-card h3 { font-size: 0.95rem; }
    .knowledge-card p { font-size: 0.75rem; margin-bottom: 10px; }
    .knowledge-card .difficulty span { width: 6px; height: 6px; }
    .knowledge-card .view-code { font-size: 0.72rem; }
    
    /* === 关于 - 2列 === */
    .about-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .about-card { padding: 18px 12px; }
    .about-icon { font-size: 1.6rem; margin-bottom: 8px; }
    .about-card h3 { font-size: 0.9rem; margin-bottom: 4px; }
    .about-card p { font-size: 0.72rem; }
    
    /* === 弹窗 === */
    .modal { max-width: 95vw; max-height: 85vh; }
    .modal-body { padding: 14px; }
    .modal-code { max-height: 250px; }
    .modal-code pre { font-size: 0.68rem !important; padding: 10px !important; }
    .modal-analysis { padding: 12px; }
    .modal-analysis h4 { font-size: 0.82rem; }
    .modal-analysis p { font-size: 0.72rem; }
    .modal-title { font-size: 0.95rem; }
    .modal-close { width: 30px; height: 30px; font-size: 1.1rem; }
    
    /* === 页脚 === */
    .footer { padding: 30px 0 22px; }
    .footer-links { gap: 10px; margin-bottom: 15px; }
    .footer-links a { font-size: 0.75rem; }
    .footer-desc { font-size: 0.78rem; }
    .beian-link { font-size: 0.78rem; padding: 7px 14px; }
    .footer-copyright { font-size: 0.7rem; }
    
    /* === 滚动条 === */
    ::-webkit-scrollbar { width: 3px; height: 3px; }
}

/* ==========================================
   小手机：0 - 480px
   ========================================== */
@media (max-width: 480px) {
    section { padding: 50px 0; }
    .container { padding: 0 12px; }
    
    .hero { padding: 75px 12px 35px; gap: 16px; }
    .hero-title { font-size: 1.7rem; }
    .hero-subtitle { font-size: 0.85rem; }
    .hero-desc { font-size: 0.75rem; margin-bottom: 14px; }
    .hero-badge { font-size: 0.68rem; padding: 4px 10px; }
    
    .btn { max-width: 230px; padding: 10px 16px; font-size: 0.82rem; }
    
    .hero-stats { gap: 6px; }
    .stat-item { padding: 10px 5px; }
    .stat-number { font-size: 1.15rem; }
    .stat-label { font-size: 0.62rem; }
    
    .section-title { font-size: 1.5rem; }
    .section-subtitle { font-size: 0.78rem; }
    .section-header { margin-bottom: 28px; }
    
    /* 语言卡片改单列 */
    .lang-grid { grid-template-columns: 1fr; gap: 8px; }
    .lang-card { padding: 14px 10px; }
    .lang-icon { font-size: 1.8rem; }
    .lang-card h3 { font-size: 1rem; }
    
    /* 关于 */
    .about-grid { grid-template-columns: 1fr; }
    .about-card { padding: 14px 10px; }
    
    /* 弹窗 */
    .modal { max-width: 95vw; max-height: 80vh; }
    .modal-code { max-height: 180px; }
    .modal-code pre { font-size: 0.62rem !important; padding: 8px !important; }
    
    /* 代码窗口 */
    .hero-code { font-size: 0.62rem !important; padding: 8px !important; }
    .code-title { font-size: 0.6rem; }
    
    .footer { padding: 22px 0 16px; }
    .beian-link { font-size: 0.7rem; padding: 6px 10px; }
}

/* ==========================================
   超小屏：0 - 360px
   ========================================== */
@media (max-width: 360px) {
    .hero { padding: 60px 8px 25px; }
    .hero-title { font-size: 1.5rem; }
    .hero-subtitle { font-size: 0.78rem; }
    .hero-desc { font-size: 0.68rem; }
    .btn { padding: 9px 14px; font-size: 0.75rem; max-width: 200px; }
    .stat-number { font-size: 1rem; }
    .stat-label { font-size: 0.58rem; }
    .section-title { font-size: 1.3rem; }
    .code-title { display: none; }
}

/* ==========================================
   横屏手机
   ========================================== */
@media (max-height: 500px) and (orientation: landscape) {
    .hero { min-height: auto; padding: 55px 14px 20px; grid-template-columns: 1fr 1fr; gap: 18px; text-align: left; }
    .hero-visual { order: 0; }
    .hero-stats { grid-template-columns: repeat(4, 1fr); gap: 6px; }
    .hero-actions { justify-content: flex-start; }
    .nav-links { padding: 12px; }
    .nav-link { padding: 8px 0; font-size: 0.95rem; }
}

/* ==========================================
   安全区域（刘海屏）
   ========================================== */
@supports (padding: env(safe-area-inset-top)) {
    .navbar { padding-top: calc(10px + env(safe-area-inset-top)); }
    .nav-links { padding-top: calc(20px + env(safe-area-inset-top)); }
    .footer { padding-bottom: calc(22px + env(safe-area-inset-bottom)); }
}

/* ==========================================
   高DPI屏
   ========================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .bg-grid { background-size: 35px 35px; }
    .code-window { -webkit-font-smoothing: antialiased; }
}