/* ========================================
   快连加速器 - 全局样式
   ======================================== */

/* CSS Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --brand-blue: #0066FF;
    --deep-black: #080B12;
    --card-bg: #131A24;
    --neon-cyan: #00F0FF;
    --success-green: #34C759;
    --warning-orange: #FF9F0A;
    --text-highlight: #FFFFFF;
    --text-secondary: #B0B8C9;
    --text-muted: #5E6675;
    --transition: cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Inter", "SF Pro", sans-serif;
    background-color: var(--deep-black);
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

/* Container */
.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--deep-black);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.navbar.scrolled {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(8, 11, 18, 0.85);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo-icon {
    width: 40px;
    height: 40px;
}

.nav-logo-text {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-highlight);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 400;
    transition: color 0.2s var(--transition);
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 24px;
    background: var(--brand-blue);
    color: var(--text-highlight) !important;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.15s var(--transition);
}

.nav-cta:hover {
    background: #1a75ff;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

/* Mobile menu toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-highlight);
    transition: all 0.3s var(--transition);
}

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

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 240, 255, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 0 0 60%;
}

.hero-visual {
    flex: 0 0 40%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-highlight);
    margin-bottom: 20px;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--brand-blue), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    letter-spacing: 1px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 52px;
    background: var(--brand-blue);
    color: var(--text-highlight);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.15s var(--transition);
}

.btn-primary:hover {
    background: #1a75ff;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 52px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-highlight);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.15s var(--transition);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.trust-badges {
    display: flex;
    gap: 30px;
    align-items: center;
    flex-wrap: wrap;
}

.trust-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.trust-badge svg {
    width: 18px;
    height: 18px;
    fill: var(--success-green);
}

/* Hero Visual - Shield Animation */
.hero-shield {
    width: 320px;
    height: 320px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-glow {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.2) 0%, transparent 70%);
    animation: pulse-glow 3s ease-in-out infinite;
}

.shield-icon {
    width: 180px;
    height: 180px;
    position: relative;
    z-index: 1;
}

.orbit-ring {
    position: absolute;
    border: 1px solid rgba(0, 240, 255, 0.15);
    border-radius: 50%;
    animation: orbit-spin 20s linear infinite;
}

.orbit-ring:nth-child(1) {
    width: 240px;
    height: 240px;
}

.orbit-ring:nth-child(2) {
    width: 300px;
    height: 300px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.orbit-dot {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--neon-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--neon-cyan);
    top: -4px;
    left: 50%;
    margin-left: -4px;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes orbit-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   Section Common
   ======================================== */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-highlight);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Features Cards
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: all 0.3s var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-blue), var(--neon-cyan));
    opacity: 0;
    transition: opacity 0.3s var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 48px;
    height: 48px;
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-highlight);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Stats Section
   ======================================== */
.stats-section {
    background: linear-gradient(180deg, transparent 0%, rgba(0, 102, 255, 0.03) 50%, transparent 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 40px 20px;
}

.stat-number {
    font-size: 48px;
    font-weight: 600;
    color: var(--text-highlight);
    font-family: "Inter", "SF Pro", sans-serif;
    margin-bottom: 8px;
}

.stat-number .unit {
    font-size: 24px;
    color: var(--neon-cyan);
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
}

/* ========================================
   Global Nodes Map
   ======================================== */
.nodes-section {
    background: var(--deep-black);
}

.world-map {
    position: relative;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 0;
}

.map-container {
    position: relative;
    width: 100%;
    aspect-ratio: 2/1;
    background: rgba(19, 26, 36, 0.5);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.05);
    overflow: hidden;
}

.map-svg {
    width: 100%;
    height: 100%;
}

.node-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.node-dot.green {
    background: var(--success-green);
    box-shadow: 0 0 12px var(--success-green);
    animation: breathe 2s ease-in-out infinite;
}

.node-dot.orange {
    background: var(--warning-orange);
    box-shadow: 0 0 12px var(--warning-orange);
    animation: breathe 1.5s ease-in-out infinite;
}

.node-dot.gray {
    background: var(--text-muted);
}

@keyframes breathe {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.3); opacity: 1; }
}

/* Node list for nodes page */
.nodes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 60px;
}

.node-card {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s var(--transition);
    border: 1px solid transparent;
}

.node-card:hover {
    border-color: rgba(0, 240, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
}

.node-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.node-status.online {
    background: var(--success-green);
    box-shadow: 0 0 8px var(--success-green);
}

.node-status.busy {
    background: var(--warning-orange);
    box-shadow: 0 0 8px var(--warning-orange);
}

.node-info h4 {
    font-size: 15px;
    color: var(--text-highlight);
    font-weight: 500;
}

.node-info span {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    align-items: start;
}

.pricing-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 40px 32px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.3s var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.pricing-card.popular {
    border-color: var(--brand-blue);
    box-shadow: 0 0 40px rgba(0, 102, 255, 0.15);
    transform: scale(1.05);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-4px);
}

.popular-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--brand-blue);
    color: var(--text-highlight);
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.pricing-name {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-highlight);
    margin-bottom: 8px;
}

.pricing-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-price {
    margin-bottom: 32px;
}

.price-original {
    font-size: 16px;
    color: var(--text-muted);
    text-decoration: line-through;
    margin-bottom: 4px;
}

.price-current {
    font-size: 40px;
    font-weight: 600;
    color: var(--text-highlight);
    font-family: "Inter", "SF Pro", sans-serif;
}

.price-current .currency {
    font-size: 20px;
    vertical-align: super;
}

.price-current .period {
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 400;
}

.pricing-features {
    text-align: left;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 15px;
    color: var(--text-secondary);
}

.pricing-features li svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.pricing-features li svg.check {
    fill: var(--success-green);
}

.pricing-features li svg.cross {
    fill: var(--text-muted);
}

.pricing-features li.disabled {
    color: var(--text-muted);
}

.btn-pricing {
    display: block;
    width: 100%;
    height: 48px;
    line-height: 48px;
    text-align: center;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.15s var(--transition);
}

.btn-pricing-primary {
    background: var(--brand-blue);
    color: var(--text-highlight);
}

.btn-pricing-primary:hover {
    background: #1a75ff;
    box-shadow: 0 0 25px rgba(0, 240, 255, 0.3);
}

.btn-pricing-outline {
    background: transparent;
    color: var(--text-highlight);
    border: 1px solid rgba(255,255,255,0.2);
}

.btn-pricing-outline:hover {
    border-color: var(--brand-blue);
    background: rgba(0, 102, 255, 0.1);
}

/* ========================================
   Protocols Section
   ======================================== */
.protocols-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.protocol-tag {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    background: rgba(19, 26, 36, 0.8);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 30px;
    font-size: 15px;
    color: var(--text-secondary);
    transition: all 0.2s var(--transition);
}

.protocol-tag:hover {
    color: var(--brand-blue);
    border-color: var(--brand-blue);
    background: rgba(0, 102, 255, 0.08);
}

.protocols-slogan {
    text-align: center;
    font-size: 20px;
    color: var(--text-highlight);
    margin-top: 40px;
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.faq-question {
    padding: 24px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-highlight);
    flex: 1;
}

.faq-toggle {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-toggle::before,
.faq-toggle::after {
    content: '';
    position: absolute;
    background: var(--text-secondary);
    transition: transform 0.3s var(--transition);
}

.faq-toggle::before {
    width: 16px;
    height: 2px;
    top: 11px;
    left: 4px;
}

.faq-toggle::after {
    width: 2px;
    height: 16px;
    top: 4px;
    left: 11px;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--transition), padding 0.3s var(--transition);
}

.faq-answer-inner {
    padding: 0 0 24px;
}

.faq-answer p,
.faq-answer ol {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.faq-answer ol {
    padding-left: 20px;
    list-style: decimal;
}

.faq-answer ol li {
    margin-bottom: 8px;
}

/* Details/Summary FAQ */
details.faq-item {
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    padding: 0 24px;
    background: var(--card-bg);
}

details.faq-item summary {
    padding: 20px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 17px;
    font-weight: 500;
    color: var(--text-highlight);
    list-style: none;
}

details.faq-item summary::-webkit-details-marker {
    display: none;
}

details.faq-item summary::after {
    content: '+';
    font-size: 24px;
    color: var(--text-muted);
    transition: transform 0.3s var(--transition);
    flex-shrink: 0;
}

details.faq-item[open] summary::after {
    transform: rotate(45deg);
}

details.faq-item .faq-answer {
    max-height: none;
    padding: 0 0 20px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: #050810;
    padding: 80px 0 40px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-muted);
    max-width: 300px;
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-highlight);
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    padding: 6px 0;
    transition: color 0.2s var(--transition);
}

.footer-col a:hover {
    color: var(--brand-blue);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-copyright {
    font-size: 14px;
    color: var(--text-muted);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    transition: all 0.2s var(--transition);
}

.footer-social a:hover {
    background: var(--brand-blue);
}

.footer-social a svg {
    width: 18px;
    height: 18px;
    fill: var(--text-muted);
}

.footer-social a:hover svg {
    fill: var(--text-highlight);
}

/* Download platforms */
.platform-icons {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.platform-icon {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-sm);
    transition: all 0.2s var(--transition);
}

.platform-icon:hover {
    background: rgba(0, 102, 255, 0.1);
}

.platform-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--text-secondary);
}

.platform-icon span {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========================================
   Download Page
   ======================================== */
.download-hero {
    padding-top: 160px;
    padding-bottom: 80px;
    text-align: center;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.download-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 40px 30px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.3s var(--transition);
}

.download-card:hover {
    border-color: var(--brand-blue);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.download-card svg {
    width: 48px;
    height: 48px;
    fill: var(--text-secondary);
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 20px;
    color: var(--text-highlight);
    margin-bottom: 8px;
}

.download-card p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.download-card .btn-primary {
    width: 100%;
}

/* ========================================
   About Page
   ======================================== */
.about-hero {
    padding-top: 160px;
    padding-bottom: 60px;
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: 17px;
    line-height: 1.8;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.value-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 32px;
    text-align: center;
}

.value-card h3 {
    font-size: 20px;
    color: var(--text-highlight);
    margin-bottom: 12px;
}

.value-card p {
    font-size: 15px;
    color: var(--text-secondary);
}

/* ========================================
   Breadcrumb
   ======================================== */
.breadcrumb {
    padding: 100px 0 20px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-list a {
    color: var(--text-muted);
}

.breadcrumb-list a:hover {
    color: var(--brand-blue);
}

.breadcrumb-list span {
    color: var(--text-muted);
}

.breadcrumb-list .current {
    color: var(--text-secondary);
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    text-align: center;
    padding: 100px 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 102, 255, 0.05) 50%, transparent 100%);
}

.cta-section h2 {
    font-size: 40px;
    font-weight: 600;
    color: var(--text-highlight);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* ========================================
   Page Hero (Sub pages)
   ======================================== */
.page-hero {
    padding: 160px 0 80px;
    text-align: center;
}

.page-hero h1 {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-highlight);
    margin-bottom: 16px;
}

.page-hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Protocol Detail Cards
   ======================================== */
.protocol-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 60px;
}

.protocol-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 32px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.3s var(--transition);
}

.protocol-card:hover {
    border-color: rgba(0, 240, 255, 0.2);
}

.protocol-card h3 {
    font-size: 20px;
    color: var(--text-highlight);
    margin-bottom: 12px;
}

.protocol-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 1023px) {
    .container {
        padding: 0 30px;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .nodes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        flex: none;
        width: 100%;
    }
    
    .hero-visual {
        flex: none;
        width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .trust-badges {
        justify-content: center;
    }
}

/* Mobile */
@media (max-width: 767px) {
    .container {
        padding: 0 20px;
    }
    
    .navbar {
        height: 64px;
    }
    
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding-top: 64px;
        min-height: auto;
        padding-bottom: 60px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary, .btn-outline {
        width: 100%;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .nodes-grid {
        grid-template-columns: 1fr;
    }
    
    .protocol-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
    
    .page-hero h1 {
        font-size: 32px;
    }
    
    .cta-section h2 {
        font-size: 28px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .platform-icons {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Large Desktop */
@media (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: 60px; }
.mb-40 { margin-bottom: 40px; }
.mb-60 { margin-bottom: 60px; }

/* Scroll animation base */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}