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

:root {
    --primary: #ff4757;
    --secondary: #ffa502;
    --dark: #1e272e;
    --darker: #0f0f1a;
    --light: #f8f9fa;
    --gradient: linear-gradient(135deg, #ff4757 0%, #ff6b81 50%, #ffa502 100%);
    --shadow: 0 10px 40px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #2d3436;
    background: var(--light);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.header {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    color: var(--dark);
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
    border-bottom: 1px solid rgba(0,0,0,0.03);
}

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

.logo h1 {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav a {
    color: #636e72;
    text-decoration: none;
    padding: 10px 20px;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s ease;
    border-radius: 50px;
}

.nav a:hover {
    color: var(--primary);
    background: rgba(255,71,87,0.08);
}

.hero {
    background: var(--gradient);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: 120px 20px 60px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="30" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="70" r="2.5" fill="rgba(255,255,255,0.1)"/><circle cx="90" cy="80" r="1.8" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 200px 200px;
}

.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 900px;
}

.hero-content h2 {
    font-size: 56px;
    margin-bottom: 16px;
    font-weight: 800;
    letter-spacing: -1px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.hero-content p {
    font-size: 22px;
    margin-bottom: 48px;
    opacity: 0.95;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    cursor: pointer;
    border: none;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.25);
}

.btn-secondary {
    background: rgba(255,255,255,0.15);
    color: white;
    border: 2px solid rgba(255,255,255,0.5);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.25);
    border-color: white;
    transform: translateY(-4px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(255,71,87,0.3);
}

section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 42px;
    margin-bottom: 20px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: #636e72;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features {
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.feature-card {
    background: white;
    padding: 40px 32px;
    border-radius: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    border: 1px solid rgba(0,0,0,0.03);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 64px;
    margin-bottom: 24px;
    display: inline-block;
    filter: drop-shadow(0 4px 12px rgba(255,71,87,0.2));
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--dark);
    font-weight: 700;
}

.feature-card p {
    color: #636e72;
    font-size: 15px;
    line-height: 1.8;
}

.pricing {
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.pricing .container {
    max-width: 1600px;
}

.pricing-grid {
    display: flex;
    justify-content: center;
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    background: white;
    padding: 32px 20px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
    flex: 1;
    max-width: 280px;
    min-width: 0;
}

.pricing-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(255,71,87,0.2);
}

.pricing-card.featured {
    background: white;
    border: 3px solid var(--primary);
    box-shadow: 0 20px 60px rgba(255,71,87,0.2);
}

.pricing-card.featured:hover {
    box-shadow: 0 25px 70px rgba(255,71,87,0.3);
}

.badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: white;
    padding: 10px 28px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(255,71,87,0.3);
    letter-spacing: 0.5px;
}

.pricing-card h3 {
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 800;
}

.price-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.price-option {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 12px 16px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 2px solid rgba(0,0,0,0.03);
}

.price-option .platform {
    background: var(--gradient);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.price-option .currency {
    font-size: 16px;
    color: var(--primary);
    font-weight: 600;
}

.price-option .amount {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.features-list {
    list-style: none;
    margin-bottom: 24px;
    text-align: left;
    flex-grow: 1;
}

.features-list li {
    padding: 10px 0;
    border-bottom: 1px solid #f1f2f6;
    color: #2d3436;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.features-list li::before {
    content: '✓';
    color: var(--primary);
    font-weight: 800;
    font-size: 14px;
}

.features-list li:last-child {
    border-bottom: none;
}

.features-list li.disabled {
    color: #b2bec3;
}

.features-list li.disabled::before {
    content: '✗';
    color: #b2bec3;
}

.notice {
    background: white;
}

.notice-content {
    max-width: 900px;
    margin: 0 auto;
}

.notice-item {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 14px 20px;
    margin-bottom: 10px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.03);
    transition: all 0.3s ease;
}

.notice-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
}

.notice-number {
    background: var(--gradient);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(255,71,87,0.25);
}

.notice-item p {
    color: #2d3436;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
    font-weight: 500;
}

.changelog {
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
}

.changelog-content {
    max-width: 900px;
    margin: 0 auto;
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    background: white;
    padding: 24px 28px;
    margin-bottom: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 24px;
    transition: all 0.3s ease;
}

.timeline-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 30px;
    width: 16px;
    height: 16px;
    background: var(--gradient);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 4px 12px rgba(255,71,87,0.3);
}

.timeline-version {
    background: var(--gradient);
    color: white;
    padding: 8px 20px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 16px;
    white-space: nowrap;
    flex-shrink: 0;
}

.timeline-date {
    color: #636e72;
    font-size: 15px;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 100px;
}

.timeline-content {
    flex-grow: 1;
}

.timeline-content ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.timeline-content li {
    color: #2d3436;
    font-size: 15px;
    padding: 6px 0;
    font-weight: 500;
}

.changelog-empty {
    text-align: center;
    padding: 80px 20px;
    background: white;
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.changelog-empty p {
    color: #b2bec3;
    font-size: 18px;
    font-weight: 500;
}

.contact {
    background: var(--darker);
    color: white;
}

.contact .section-title {
    color: white;
}

.contact .section-subtitle {
    color: rgba(255,255,255,0.7);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 24px;
    background: rgba(255,255,255,0.05);
    padding: 28px 32px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.08);
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: rgba(255,255,255,0.08);
    transform: translateX(8px);
}

.contact-icon {
    font-size: 44px;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(255,71,87,0.3);
}

.contact-item h3 {
    font-size: 18px;
    margin-bottom: 6px;
    font-weight: 700;
}

.contact-item p {
    color: rgba(255,255,255,0.7);
    font-size: 15px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 18px 24px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    font-size: 16px;
    font-family: inherit;
    background: rgba(255,255,255,0.05);
    color: white;
    transition: all 0.3s ease;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(255,255,255,0.4);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255,255,255,0.08);
    box-shadow: 0 0 0 4px rgba(255,71,87,0.1);
}

.footer {
    background: #0a0a12;
    color: white;
    padding: 80px 0 30px;
}

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

.footer-logo h3 {
    font-size: 28px;
    margin-bottom: 12px;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-logo p {
    color: rgba(255,255,255,0.6);
    font-size: 15px;
}

.footer-links h4 {
    font-size: 18px;
    margin-bottom: 24px;
    font-weight: 700;
}

.footer-links a {
    display: block;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    margin-bottom: 14px;
    transition: all 0.3s;
    font-weight: 500;
}

.footer-links a:hover {
    color: var(--primary);
    transform: translateX(4px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.4);
    font-size: 14px;
}

@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1400px) {
    .pricing-grid {
        flex-wrap: wrap;
    }
    .pricing-card {
        flex: 1 1 28%;
        max-width: 28%;
    }
}

@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1000px) {
    .pricing-card {
        flex: 1 1 40%;
        max-width: 40%;
    }
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 12px;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav a {
        padding: 6px 12px;
        font-size: 13px;
    }

    .hero {
        padding: 140px 20px 40px;
    }

    .hero-content h2 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section-title {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-card {
        flex: 1 1 100%;
        max-width: 100%;
    }

    .timeline-item {
        flex-direction: column;
        gap: 12px;
    }

    .timeline-date {
        min-width: auto;
    }
}

@media (max-width: 550px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}