/* ========================================
   Spirai 科技主题 v2 - 增强科技风格
   ======================================== */

/* CSS Variables */
:root {
    --primary: #0066FF;
    --primary-light: #4D9FFF;
    --primary-dark: #0052CC;
    --accent: #00D4FF;
    --accent-secondary: #8B5CF6;
    --accent-glow: rgba(0, 212, 255, 0.3);
    
    --bg-dark: #0A0E1A;
    --bg-card: #111827;
    --bg-card-hover: #1a2235;
    --bg-overlay: rgba(10, 14, 26, 0.85);
    
    --text-white: #FFFFFF;
    --text-gray: #CBD5E1;
    --text-muted: #94A3B8;
    
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.15);
    
    --gradient-primary: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
    --gradient-accent: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
    --gradient-dark: linear-gradient(180deg, #0A0E1A 0%, #111827 100%);
    --gradient-hero: linear-gradient(180deg, transparent 0%, #0A0E1A 100%);
    
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.4);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --header-height: 72px;
}

/* Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition-fast); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    z-index: 1001;
}
.logo-icon {
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.5));
}
.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Desktop Nav */
.nav-desktop {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-link {
    position: relative;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-gray);
    padding: 8px 0;
    transition: var(--transition-fast);
}
.nav-link:hover, .nav-link.active { color: var(--text-white); }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-normal);
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.btn-nav-cta {
    background: var(--gradient-primary);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}
.btn-nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 102, 255, 0.5);
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 8px;
}
.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-white);
    border-radius: 2px;
    transition: var(--transition-normal);
}
.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.hamburger.active .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Dropdown Nav */
.nav-dropdown {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    padding: 100px 32px 40px;
}
.nav-dropdown.open { right: 0; }
.nav-dropdown-inner {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.nav-dropdown-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-gray);
    transition: var(--transition-fast);
}
.nav-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-white);
}
.nav-dropdown-item i {
    width: 24px;
    font-size: 1.2rem;
    color: var(--accent);
}
.nav-dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 16px 0;
}
.btn-dropdown-cta {
    display: block;
    text-align: center;
    background: var(--gradient-primary);
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    margin-top: 16px;
    box-shadow: 0 4px 20px rgba(0, 102, 255, 0.4);
}
.nav-dropdown-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 998;
}
.nav-dropdown-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0, 102, 255, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse 60% 50% at 70% 60%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.hero-grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 0%, transparent 70%);
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    animation: float 8s ease-in-out infinite;
}
.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.3) 0%, transparent 70%);
    top: -200px;
    left: -100px;
    animation-delay: 0s;
}
.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, transparent 70%);
    bottom: -100px;
    right: -50px;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge-wrapper { margin-bottom: 32px; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent);
}
.hero-badge i { animation: pulse 2s ease-in-out infinite; }
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}
.hero-title-line { display: block; }
.hero-title-line.accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 30px rgba(0, 102, 255, 0.5));
}

.hero-company {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    letter-spacing: 0.1em;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}
.btn i { transition: transform var(--transition-fast); }
.btn:hover i { transform: translateX(4px); }

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(0, 102, 255, 0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 102, 255, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-white);
    border: 1px solid var(--border-light);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
}

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 1px solid var(--border-light);
    padding: 12px 24px;
}
.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-ghost {
    background: transparent;
    color: var(--text-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-lg { padding: 18px 36px; font-size: 1.1rem; }

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}
.hero-stat { text-align: center; }
.hero-stat-num {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}
.hero-stat-divider {
    width: 1px;
    height: 50px;
    background: var(--border);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ========================================
   Sections
   ======================================== */
.section { padding: 100px 0; }

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}
.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 16px;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.section-footer {
    text-align: center;
    margin-top: 48px;
}

/* ========================================
   Features Grid
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
    overflow: hidden;
}
.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 102, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}
.feature-card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-normal);
}
.feature-card:hover .feature-card-glow { opacity: 1; }

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 102, 255, 0.1);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 20px;
}
.feature-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}
.feature-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}
.feature-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.feature-tag {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 10px;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-light);
    border-radius: 50px;
}

/* ========================================
   Articles Grid
   ======================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
}
.article-card:hover {
    border-color: rgba(0, 102, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.article-cover {
    position: relative;
    height: 200px;
    background-size: cover;
    background-position: center;
}
.article-cover-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.4) 100%);
}

.article-content { padding: 24px; }
.article-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 12px;
}
.article-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.article-read-more {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-light);
    transition: var(--transition-fast);
}
.article-card:hover .article-read-more { gap: 10px; }

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    position: relative;
    padding: 100px 0;
    overflow: hidden;
}
.cta-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-dark);
}
.cta-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(0, 102, 255, 0.2) 0%, transparent 60%);
    filter: blur(60px);
}
.cta-content {
    position: relative;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}
.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
}
.cta-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}
.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 80px 0 40px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.3rem;
    margin-bottom: 16px;
}
.footer-tagline {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}
.footer-social {
    display: flex;
    gap: 12px;
}
.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: var(--transition-fast);
}
.social-link:hover {
    background: rgba(0, 102, 255, 0.2);
    color: var(--accent);
}
.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
    color: var(--text-white);
}
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links li {
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: var(--transition-fast);
}
.footer-links li:hover { color: var(--text-white); }
.footer-links li i { margin-right: 8px; color: var(--accent); }
.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ========================================
   Mobile Responsive
   ======================================== */
@media (max-width: 768px) {
    .nav-desktop { display: none; }
    .hamburger { display: flex; }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    .hero-stat-divider {
        width: 60px;
        height: 1px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .footer-brand { grid-column: 1 / -1; }
    
    .section { padding: 60px 0; }
}


/* Logo Image - Constrained Size */
.logo-img {
    height: 32px !important;
    width: auto !important;
    max-width: 140px !important;
    object-fit: contain !important;
}
.footer-logo-img {
    height: 28px !important;
    width: auto !important;
    max-width: 100px !important;
    object-fit: contain !important;
}
.logo {
    overflow: visible !important;
}