/* 
  Style Sheet for 星链云机场 (shanlianvpn.lol)
  Skeuomorphic Touch + Soft Dynamic Background Decorator + Modern Typography
*/

:root {
    --bg-base: #f0f2f5;
    --bg-card: #ffffff;
    --primary-color: #ff8c00; /* Warm Skeuomorphic Amber/Orange matching Image 2 */
    --primary-gradient: linear-gradient(135deg, #ff9d00 0%, #ff6c00 100%);
    --blue-button-gradient: linear-gradient(180deg, #4b8dfe 0%, #1e6bf2 100%); /* Skeuomorphic Blue button matching Image 1 */
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-skeuo: rgba(255, 255, 255, 0.8);
    --shadow-skeuo: 
        0 10px 25px -5px rgba(0, 0, 0, 0.05),
        0 8px 10px -6px rgba(0, 0, 0, 0.03),
        inset 0 1px 1px rgba(255, 255, 255, 0.9),
        inset 0 -2px 4px rgba(0, 0, 0, 0.04);
    --shadow-skeuo-hover: 
        0 20px 35px -10px rgba(0, 0, 0, 0.1),
        0 12px 15px -8px rgba(0, 0, 0, 0.05),
        inset 0 1px 2px rgba(255, 255, 255, 1);
    --radius-card: 20px;
    --radius-btn: 50px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-base);
}

body {
    overflow-x: hidden;
    line-height: 1.6;
    background: radial-gradient(circle at 50% 0%, #ffffff 0%, #f0f2f5 70%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Nav */
.navbar-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(240, 242, 245, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo-icon {
    font-size: 1.6rem;
}

.logo-sub {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 28px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-btn);
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
    border: none;
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
    box-shadow: inset 0 1px 1px #fff, 0 2px 4px rgba(0,0,0,0.05);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(255, 140, 0, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.5);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 140, 0, 0.45);
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 90px 0 70px 0;
    text-align: center;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: -150px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 140, 0, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
    z-index: 0;
    animation: pulseGlow 6s infinite alternate ease-in-out;
}

@keyframes pulseGlow {
    0% { transform: translateX(-50%) scale(0.9); opacity: 0.7; }
    100% { transform: translateX(-50%) scale(1.15); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.badge-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(255, 140, 0, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(255, 140, 0, 0.25);
    border-radius: 30px;
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, #ff8c00 0%, #e65100 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 750px;
    margin: 0 auto 36px auto;
}

.hero-cta-group {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.btn-hero-primary {
    padding: 16px 36px;
    font-size: 1.1rem;
    background: var(--blue-button-gradient); /* Image 1 skeuomorphic button style */
    color: white;
    border-radius: var(--radius-card);
    box-shadow: 0 8px 24px rgba(30, 107, 242, 0.35), inset 0 1px 2px rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-hero-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(30, 107, 242, 0.45);
}

.btn-hero-secondary {
    padding: 16px 32px;
    font-size: 1.1rem;
    background: #ffffff;
    color: var(--text-main);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-skeuo);
    border: 1px solid var(--border-skeuo);
}

.btn-hero-secondary:hover {
    transform: translateY(-2px);
    background: #f8fafc;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.stat-item {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.8);
    box-shadow: var(--shadow-skeuo);
}

.stat-num {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* General Skeuomorphic Card Base (Image 1 Style) */
.skeuo-card {
    background: var(--bg-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-skeuo);
    box-shadow: var(--shadow-skeuo);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.skeuo-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-skeuo-hover);
}

/* Section Title */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-title p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Features Section */
.features-section {
    padding: 70px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px 24px;
    text-align: left;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Pricing Section (Matching Image 2 Specs Exactly) */
.pricing-section {
    padding: 70px 0;
    background: rgba(255, 255, 255, 0.4);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    align-items: center;
}

.pricing-card {
    padding: 40px 30px;
    position: relative;
    background: #ffffff;
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.pricing-card.popular {
    border: 2px solid #ff8c00;
    box-shadow: 0 15px 35px rgba(255, 140, 0, 0.15), var(--shadow-skeuo);
    transform: scale(1.04);
}

.pricing-card.popular:hover {
    transform: scale(1.06) translateY(-4px);
}

.popular-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-gradient);
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 20px;
    box-shadow: 0 4px 10px rgba(255, 140, 0, 0.3);
}

.plan-header h3 {
    font-size: 1.4rem;
    font-weight: 800;
}

.plan-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.plan-price {
    margin: 24px 0 6px 0;
    color: #ff5500;
}

.plan-price .currency {
    font-size: 1.4rem;
    font-weight: 700;
}

.plan-price .amount {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
}

.plan-price .period {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.billing-type {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.plan-features {
    list-style: none;
    margin-bottom: 30px;
}

.plan-features li {
    padding: 8px 0;
    font-size: 0.95rem;
    color: #4b5563;
    display: flex;
    align-items: center;
    gap: 8px;
}

.plan-features .check {
    color: #ff8c00;
    font-weight: bold;
}

.btn-outline-skeuo {
    width: 100%;
    border: 1px solid #ff8c00;
    color: #ff8c00;
    background: #ffffff;
    box-shadow: inset 0 1px 1px rgba(255,255,255,0.8), 0 2px 4px rgba(0,0,0,0.02);
}

.btn-outline-skeuo:hover {
    background: rgba(255, 140, 0, 0.05);
}

.btn-primary-skeuo {
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 6px 18px rgba(255, 140, 0, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.6);
}

.btn-primary-skeuo:hover {
    box-shadow: 0 8px 24px rgba(255, 140, 0, 0.45);
}

/* Articles Knowledge Hub */
.articles-section {
    padding: 70px 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.article-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.article-tag {
    display: inline-block;
    align-self: flex-start;
    padding: 3px 10px;
    background: #eff6ff;
    color: #2563eb;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.article-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 10px;
}

.article-card h3 a {
    color: var(--text-main);
    text-decoration: none;
}

.article-card h3 a:hover {
    color: var(--primary-color);
}

.article-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.5;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: #9ca3af;
    border-top: 1px solid #f3f4f6;
    padding-top: 12px;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.read-more:hover {
    text-decoration: underline;
}

/* FAQ Section */
.faq-section {
    padding: 70px 0;
    background: rgba(255, 255, 255, 0.5);
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    padding: 20px 24px;
    cursor: pointer;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question h4 {
    font-size: 1.05rem;
    font-weight: 700;
}

.faq-toggle {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, margin-top 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    margin-top: 14px;
}

.faq-answer p {
    font-size: 0.95rem;
    color: var(--text-muted);
    border-top: 1px dashed #e5e7eb;
    padding-top: 12px;
}

/* Article Page Layout Styles */
.article-page-body {
    background: #f8fafc;
}

.article-container {
    max-width: 900px;
    margin: 40px auto;
    background: #ffffff;
    padding: 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-skeuo);
}

.article-header-meta {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e2e8f0;
}

.article-header-meta h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
}

.meta-info {
    display: flex;
    gap: 20px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.85;
    color: #334155;
}

.article-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 32px 0 16px 0;
    color: var(--text-main);
    border-left: 4px solid var(--primary-color);
    padding-left: 12px;
}

.article-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 24px 0 12px 0;
}

.article-body p {
    margin-bottom: 18px;
}

.article-body ul, .article-body ol {
    margin: 0 0 20px 24px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-cta-box {
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
    border: 1px solid rgba(255, 140, 0, 0.3);
    padding: 24px;
    border-radius: 16px;
    margin: 36px 0;
    text-align: center;
}

.article-cta-box h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: #c2410c;
}

/* User Reviews Section on Article Page */
.user-reviews-section {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 2px dashed #e2e8f0;
}

.review-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.review-card {
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
}

.review-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.reviewer-name {
    font-weight: 700;
    font-size: 0.95rem;
}

.stars {
    color: #f59e0b;
}

.review-text {
    font-size: 0.88rem;
    color: #475569;
}

/* CTA Banner */
.cta-banner {
    padding: 60px 0;
}

.cta-box {
    text-align: center;
    padding: 50px 30px;
    background: linear-gradient(135deg, #ffffff 0%, #fff7ed 100%);
    border: 2px solid rgba(255, 140, 0, 0.2);
}

.cta-box h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.cta-box p {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 28px;
}

/* Footer */
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 60px 0 20px 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: #ffffff;
    margin-bottom: 12px;
}

.footer-links h4, .footer-seo h4 {
    color: #ffffff;
    font-size: 1.05rem;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-seo p {
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 20px;
    text-align: center;
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 992px) {
    .features-grid, .pricing-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .pricing-card.popular {
        transform: none;
    }
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .nav-links { display: none; }
    .hero-title { font-size: 2.2rem; }
    .features-grid, .pricing-grid, .articles-grid, .review-cards, .footer-content {
        grid-template-columns: 1fr;
    }
}