/* Feiniaoyun CSS Stylesheet */
:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #161f30;
    --bg-glass: rgba(22, 31, 48, 0.7);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --primary-gradient: linear-gradient(135deg, #00d2ff 0%, #7a00ff 100%);
    --text-gradient: linear-gradient(135deg, #00d2ff 0%, #a855f7 100%);
    --accent-blue: #00d2ff;
    --accent-purple: #a855f7;
    --shadow-glow: 0 8px 32px 0 rgba(0, 210, 255, 0.15);
    --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Background Birds Animation Overlay */
.birds-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.15;
    background-image: radial-gradient(circle at 50% 50%, transparent 60%, var(--bg-primary) 100%);
}

/* Hero Section with bird background image */
.hero-section {
    max-width: none;
    width: 100%;
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, rgba(11, 15, 25, 0.6) 0%, rgba(11, 15, 25, 0.95) 100%), url('../images/hero-bg.jpg') no-repeat center center / cover;
    padding: 80px 20px;
    text-align: center;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    z-index: 100;
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-img {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: var(--accent-blue);
}

.nav-cta {
    background: var(--primary-gradient);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: var(--shadow-glow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(0, 210, 255, 0.3);
}

/* Hero Content */
.hero-content {
    max-width: 850px;
    z-index: 2;
}

.badge {
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-blue);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    border: 1px solid rgba(0, 210, 255, 0.2);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 700;
    padding: 16px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.1rem;
    box-shadow: var(--shadow-glow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 45px 0 rgba(0, 210, 255, 0.35);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-weight: 600;
    padding: 16px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.1rem;
    border: 1px solid var(--border-glass);
    transition: background 0.3s, border-color 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-blue);
}

/* Sections General */
section {
    padding: 100px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    color: var(--accent-blue);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    display: block;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Cards & Glassmorphism */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    padding: 40px;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 210, 255, 0.3);
    box-shadow: var(--shadow-glow);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(0, 210, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--accent-blue);
    font-size: 1.8rem;
    border: 1px solid rgba(0, 210, 255, 0.2);
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
}

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

/* Pricing Section */
.pricing-toggle-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 40px;
}

.pricing-toggle-label {
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s;
}

.pricing-toggle-label.active {
    color: var(--accent-blue);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 3px;
    bottom: 3px;
    background-color: var(--accent-blue);
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(0, 210, 255, 0.4);
}

input:checked + .slider {
    background-color: var(--bg-secondary);
}

input:checked + .slider:before {
    transform: translateX(26px);
    background-color: var(--accent-purple);
    box-shadow: 0 2px 10px rgba(168, 85, 247, 0.4);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.pricing-card {
    position: relative;
    overflow: hidden;
}

.pricing-card.popular {
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
}

.popular-badge {
    position: absolute;
    top: 20px;
    right: -35px;
    background: var(--primary-gradient);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 40px;
    transform: rotate(45deg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.pricing-price {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 24px;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.pricing-price span {
    font-size: 1rem;
    color: var(--text-secondary);
    -webkit-text-fill-color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 35px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.pricing-features i {
    color: var(--accent-blue);
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
    width: 100%;
    justify-content: center;
}

/* Articles Section */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.article-card {
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.article-img-placeholder {
    height: 200px;
    background: linear-gradient(135deg, rgba(0, 210, 255, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    border-bottom: 1px solid var(--border-glass);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-img-placeholder::after {
    content: "🐦";
    font-size: 3rem;
    opacity: 0.5;
}

.article-body {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.4;
    transition: color 0.3s;
}

.article-card:hover .article-title {
    color: var(--accent-blue);
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
    flex-grow: 1;
}

.article-link {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.article-link:hover i {
    transform: translateX(5px);
}

.article-link i {
    transition: transform 0.2s;
}

/* User Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    position: relative;
}

.testimonial-quote {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 24px;
    position: relative;
}

.testimonial-quote::before {
    content: "“";
    font-size: 4rem;
    color: rgba(0, 210, 255, 0.15);
    position: absolute;
    top: -30px;
    left: -20px;
}

.testimonial-user {
    display: flex;
    align-items: center;
    gap: 15px;
}

.avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #fff;
    border: 2px solid var(--border-glass);
}

.user-name {
    font-weight: 700;
    font-size: 1rem;
}

.user-role {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* FAQ Accordion */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-glass);
    padding: 20px 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 700;
    transition: color 0.3s;
}

.faq-question:hover, .faq-question.active {
    color: var(--accent-blue);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: max-height 0.3s ease-out, margin-top 0.3s;
}

.faq-answer p {
    margin-top: 15px;
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform 0.3s;
}

.faq-question.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent-purple);
}

/* Article Template Custom Styles */
.article-page {
    padding-top: 140px;
    max-width: 900px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
    text-align: center;
}

.article-content {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    padding: 50px;
    margin-bottom: 50px;
}

.article-content h2 {
    font-size: 1.8rem;
    margin-top: 40px;
    margin-bottom: 20px;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.article-content p {
    margin-bottom: 24px;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.article-content ul, .article-content ol {
    margin-bottom: 24px;
    padding-left: 20px;
    color: var(--text-secondary);
}

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

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    border: 1px solid var(--border-glass);
}

.article-content th, .article-content td {
    padding: 12px 15px;
    border: 1px solid var(--border-glass);
    text-align: left;
}

.article-content th {
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-blue);
    font-weight: 700;
}

.article-content tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.internal-links-box {
    margin-top: 40px;
    padding: 25px;
    background: rgba(0, 210, 255, 0.03);
    border-left: 4px solid var(--accent-blue);
    border-radius: 0 16px 16px 0;
}

.internal-links-box h4 {
    margin-bottom: 12px;
    color: var(--accent-blue);
}

.internal-links-box ul {
    list-style: none;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.internal-links-box a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.internal-links-box a:hover {
    color: var(--accent-blue);
}

/* Footer */
footer {
    background: #070a11;
    border-top: 1px solid var(--border-glass);
    padding: 60px 5% 30px;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.footer-nav {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-nav a:hover {
    color: var(--accent-blue);
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Floating SVG birds styles */
.flying-bird {
    position: absolute;
    width: 24px;
    height: 24px;
    fill: var(--accent-blue);
    opacity: 0.3;
    animation: fly 12s linear infinite;
}

@keyframes fly {
    0% {
        transform: translate(-100px, 100px) scale(0.5);
        opacity: 0;
    }
    10% {
        opacity: 0.4;
    }
    90% {
        opacity: 0.4;
    }
    100% {
        transform: translate(110vw, -100px) scale(1.2);
        opacity: 0;
    }
}

/* Media Queries (Mobile responsiveness) */
@media (max-width: 768px) {
    header {
        padding: 15px 20px;
    }

    nav ul {
        display: none; /* Can add a mobile burger if needed, or simple nav for landing page */
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    section {
        padding: 60px 20px;
    }

    .article-content {
        padding: 25px;
    }
    
    .article-content h2 {
        font-size: 1.4rem;
    }
}