/* ==========================================================================
   Design Tokens & CSS Variables
   ========================================================================== */
:root {
    /* 核心调色板：流光暗黑科技风 */
    --bg-base: #050507;
    --bg-surface: rgba(18, 18, 22, 0.6);
    --bg-surface-hover: rgba(30, 30, 36, 0.7);
    
    /* 渐变与主题色 */
    --accent-primary: #00F0FF; /* 赛博青/亮青色 */
    --accent-secondary: #7000FF; /* 深夜紫 */
    --accent-tertiary: #FF0055; /* 引擎红 */
    --gradient-glow: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    --gradient-text: linear-gradient(to right, #ffffff, #a0a5b5);
    
    /* 文本颜色 */
    --text-primary: #FFFFFF;
    --text-secondary: #9095A6;
    --text-muted: #606473;
    
    /* 玻璃质感配置 (Glassmorphism) */
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(20px);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    
    /* 排版系统 */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* 间距系统 */
    --spacing-xs: 0.5rem;   /* 8px */
    --spacing-sm: 1rem;     /* 16px */
    --spacing-md: 1.5rem;   /* 24px */
    --spacing-lg: 2.5rem;   /* 40px */
    --spacing-xl: 4rem;     /* 64px */
    --spacing-xxl: 8rem;    /* 128px */
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* 动画配置 */
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Reset & Normalize
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    font-weight: 600;
}

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

ul {
    list-style: none;
}

img, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   Global Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
    position: relative;
    z-index: 10;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
}

.text-gradient {
    background: var(--gradient-glow);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* ==========================================================================
   Background Dynamics (Ambient Glow)
   ========================================================================== */
.ambient-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    animation: float 20s infinite ease-in-out;
}

.glow-1 {
    top: -10%;
    right: -5%;
    background: var(--accent-primary);
    animation-delay: 0s;
}

.glow-2 {
    bottom: -10%;
    left: -10%;
    background: var(--accent-secondary);
    animation-delay: -5s;
}

.glow-3 {
    top: 40%;
    left: 40%;
    width: 400px;
    height: 400px;
    background: var(--accent-tertiary);
    animation-delay: -10s;
    opacity: 0.08;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -50px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-base);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Glass Panels */
.glass-panel {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
}

.glass-card {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: transform var(--transition-normal), border-color var(--transition-fast), background var(--transition-fast);
    position: relative;
}

/* Neon Glow Effect for Cards via JS */
.glow-effect::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: inherit;
    padding: 2px;
    background: radial-gradient(800px circle at var(--mouse-x, 0) var(--mouse-y, 0), rgba(255,255,255,0.1), transparent 40%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.glow-effect:hover::before {
    opacity: 1;
}

.glass-card:hover {
    transform: translateY(-5px);
    background: var(--bg-surface-hover);
    border-color: rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-sm) 0;
    z-index: 100;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(5, 5, 7, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    padding: 12px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem; letter-spacing: -0.02em;
}

.logo i {
    font-size: 1.8rem;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a:not(.btn) {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:not(.btn):hover {
    color: var(--text-primary);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 4.5rem);
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-sm);
    text-wrap: balance;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tech-stack {
    font-size: 0.875rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Hero Mockup (Decorative CSS Art) */
.app-mockup-main {
    aspect-ratio: 4/5;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.dashboard-preview {
    flex: 1;
    background: #0A0A0E;
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 40px rgba(0,0,0,0.8);
}

.gauge-ring {
    width: 200px; height: 200px;
    border-radius: 50%;
    border: 15px solid rgba(0, 240, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-right-color: var(--accent-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-45deg);
    margin-bottom: 2rem;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.2);
}

.gauge-value {
    transform: rotate(45deg);
    font-family: var(--font-heading);
    font-size: 4rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
}

.gauge-value .unit {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 5px;
}

.stats-row {
    display: flex;
    gap: 1.5rem;
    width: 100%;
    justify-content: space-around;
    padding: 0 1rem;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat .label {
    font-size: 0.75rem; color: var(--text-muted); font-weight: 600;
}
.stat .val {
    font-size: 1.25rem; font-family: var(--font-heading); font-weight: 600; color: #EFEFEF;
}

/* ==========================================================================
   Features (Bento Grid)
   ========================================================================== */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: minmax(280px, auto);
    gap: var(--spacing-md);
}

.bento-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-large {
    grid-column: span 2;
    grid-row: span 2;
}

.card-wide {
    grid-column: span 2;
}

.icon-box {
    width: 48px; height: 48px;
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.bento-card h3 {
    font-size: 1.5rem; margin-bottom: 12px;
}

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

.feature-list {
    margin-top: var(--spacing-md);
    display: flex; flex-direction: column; gap: 8px;
}

.feature-list li {
    display: flex; align-items: center; gap: 8px; font-size: 0.95rem;
}

.feature-list i {
    color: var(--accent-primary);
}

/* Mockup UI for cards */
.code-scanner {
    margin-top: var(--spacing-lg);
    background: #0A0A0E;
    border-radius: var(--radius-md);
    padding: 1rem;
    font-family: 'SF Mono', Consolas, monospace;
    font-size: 0.85rem;
    position: relative;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

.scan-line {
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-primary);
    animation: scan 3s infinite linear;
}

@keyframes scan {
    0% { top: 0; opacity: 0;}
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

.fault-item {
    padding: 8px; border-bottom: 1px solid rgba(255,255,255,0.05);
    color: #ff4757; display: flex; justify-content: space-between;
}
.fault-item.resolved {
    color: #2ed573; text-decoration: line-through;
}
.fault-item span { color: var(--text-muted); }


/* ==========================================================================
   Showcase Workflow
   ========================================================================== */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.step-list {
    margin-top: var(--spacing-lg);
    display: flex; flex-direction: column; gap: var(--spacing-md);
}

.step-item {
    display: flex; gap: var(--spacing-md);
}

.step-num {
    font-family: var(--font-heading); font-size: 2rem;
    font-weight: 800; color: rgba(255,255,255,0.1);
    line-height: 1;
}

.step-text h4 {
    font-size: 1.25rem; margin-bottom: 4px;
}

.step-text p {
    color: var(--text-secondary); font-size: 0.95rem;
}

.app-flow {
    padding: 2rem;
    display: flex; flex-direction: column; gap: 1rem;
    background: #0A0A0E; height: 100%; border-radius: var(--radius-md);
}

.flow-step {
    padding: 1rem; border-radius: 12px;
    background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.05);
    display: flex; align-items: center; gap: 12px; font-weight: 500;
    color: var(--text-secondary);
}

.flow-step.active {
    background: rgba(0, 240, 255, 0.05);
    border-color: rgba(0, 240, 255, 0.3);
    color: var(--text-primary);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
}

.flow-step i { font-size: 1.5rem; }
.flow-step.active i { color: var(--accent-primary); }

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-card {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(180deg, rgba(30,30,36,0.6) 0%, rgba(5,5,7,0.6) 100%);
}

.cta-card h2 {
    font-size: clamp(2rem, 4vw, 3rem); margin-bottom: var(--spacing-sm);
}
.cta-card p {
    font-size: 1.125rem; color: var(--text-secondary);
    margin-bottom: var(--spacing-lg); max-width: 600px; margin-inline: auto;
}

.cta-buttons {
    display: flex; justify-content: center; gap: var(--spacing-md); flex-wrap: wrap;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    border-top: 1px solid var(--glass-border);
    padding-top: var(--spacing-xl);
    background: #020202; /* 更深的纯黑垫底 */
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand p {
    color: var(--text-secondary); margin: var(--spacing-md) 0; font-size: 0.95rem;
}

.social-links {
    display: flex; gap: 12px;
}

.social-links a {
    width: 40px; height: 40px; border-radius: 50%;
    background: rgba(255,255,255,0.05);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; color: var(--text-primary);
}

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

.link-group h4 {
    margin-bottom: var(--spacing-md); font-size: 1.1rem;
}

.link-group ul {
    display: flex; flex-direction: column; gap: 12px;
}

.link-group a {
    color: var(--text-secondary); font-size: 0.95rem;
}

.link-group a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-md) 0;
    text-align: center; color: var(--text-muted); font-size: 0.875rem;
}

/* ==========================================================================
   Animations & Reveals
   ========================================================================== */
.reveal {
    opacity: 0;
    will-change: transform, opacity;
}

.reveal.active {
    opacity: 1;
}

.fade-up {
    transform: translateY(40px);
}
.fade-up.active {
    transform: translateY(0);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-left {
    transform: translateX(40px);
}
.fade-left.active {
    transform: translateX(0);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-right {
    transform: translateX(-40px);
}
.fade-right.active {
    transform: translateX(0);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container { grid-template-columns: 1fr; text-align: center; }
    .hero-actions { justify-content: center; }
    .hero-subtitle { margin-inline: auto; }
    .tech-stack { justify-content: center; }
    .app-mockup-main { max-width: 500px; margin-inline: auto; }
    
    .bento-grid { grid-template-columns: repeat(2, 1fr); }
    
    .split-layout { grid-template-columns: 1fr; }
    .split-visual { order: 2; margin-top: var(--spacing-lg); }
    
    .footer-container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    
    .bento-grid { grid-template-columns: 1fr; }
    .card-large, .card-wide { grid-column: span 1; }
    
    .footer-container { grid-template-columns: 1fr; }
    
    .cta-buttons { flex-direction: column; }
    .cta-btn { width: 100%; }
}