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

:root {
    --primary-blue: #4A90D9;
    --light-blue: #87CEEB;
    --lighter-blue: #B0D4F1;
    --pale-blue: #E3F2FD;
    --white: #FFFFFF;
    --dark-text: #1A365D;
    --medium-text: #2D5986;
    --light-text: #5A7FA8;
    --gradient-start: #E8F4FD;
    --gradient-end: #FFFFFF;
    --shadow-light: rgba(74, 144, 217, 0.15);
    --shadow-medium: rgba(74, 144, 217, 0.25);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(180deg, var(--gradient-start) 0%, var(--white) 100%);
    min-height: 100vh;
    color: var(--dark-text);
    line-height: 1.6;
}

header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--lighter-blue);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo img {
    width: 48px;
    height: 48px;
    filter: drop-shadow(0 2px 4px var(--shadow-light));
}

.logo span {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: -0.5px;
}

.demo-badge {
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px var(--shadow-medium);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    padding: 4rem 0 2rem;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--dark-text);
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--dark-text), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text h2 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--medium-text);
    margin-bottom: 1.5rem;
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--light-text);
    margin-bottom: 2rem;
    max-width: 550px;
}

.demo-notice {
    background: linear-gradient(135deg, #FFF8E1, #FFFDE7);
    border: 2px solid #FFD54F;
    border-radius: 1rem;
    padding: 1.25rem;
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
    box-shadow: 0 4px 20px rgba(255, 193, 7, 0.2);
}

.notice-icon {
    font-size: 1.5rem;
}

.notice-text h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #F57C00;
    margin-bottom: 0.25rem;
}

.notice-text p {
    font-size: 0.9rem;
    color: #795548;
    margin: 0;
}

.download-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 1rem;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.75rem;
    border-radius: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--shadow-medium);
    min-width: 200px;
}

.download-btn.windows {
    background: linear-gradient(135deg, var(--primary-blue), #3B7DC4);
    color: white;
}

.download-btn.linux {
    background: linear-gradient(135deg, #2D5986, var(--dark-text));
    color: white;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.download-btn:active {
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 2rem;
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-label {
    font-size: 0.75rem;
    font-weight: 500;
    opacity: 0.9;
}

.btn-platform {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Download Center Styles */
.download-center {
    padding: 2rem 0 3rem;
    text-align: center;
}

.download-center h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 1.5rem;
}

.download-grid-main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.download-card-main {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid var(--lighter-blue);
    border-radius: 1.25rem;
    padding: 1.25rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--shadow-light);
    text-align: left;
}

.download-card-main:hover {
    transform: translateY(-5px);
    background: white;
    box-shadow: 0 10px 30px var(--shadow-medium);
    border-color: var(--primary-blue);
}

.card-header-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.card-icon-main {
    font-size: 2rem;
    background: var(--pale-blue);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.75rem;
}

.card-title-main h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark-text);
}

.card-title-main p {
    font-size: 0.8rem;
    color: var(--primary-blue);
    margin: 0;
    font-weight: 600;
}

.card-desc-main {
    font-size: 0.9rem !important;
    color: var(--light-text) !important;
    margin-bottom: 0.75rem !important;
}

.card-actions-main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.75rem;
}

.system-requirements {
    padding: 3rem 0;
    text-align: center;
}

.system-requirements h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 2rem;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.requirements-card {
    background: white;
    border-radius: 1.25rem;
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--shadow-light);
    border: 1px solid var(--pale-blue);
    text-align: left;
}

.requirements-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 1rem;
}

.requirements-table {
    width: 100%;
    border-collapse: collapse;
}

.requirements-table td {
    padding: 0.6rem 0.5rem;
    font-size: 0.9rem;
    color: var(--medium-text);
    border-bottom: 1px solid var(--pale-blue);
}

.requirements-table tr:last-child td {
    border-bottom: none;
}

.requirements-table td:first-child {
    font-weight: 600;
    white-space: nowrap;
    width: 100px;
}

.download-btn-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.download-btn-compact.windows {
    background: var(--primary-blue);
    color: white;
}

.download-btn-compact.linux {
    background: var(--dark-text);
    color: white;
}

.download-btn-compact.macos {
    background: linear-gradient(135deg, #636366, #48484a);
    color: white;
}

.download-btn-compact:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.btn-icon-small {
    font-size: 1.25rem;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: start;
}

.hero-image img {
    width: 100%;
    max-width: 350px;
    filter: drop-shadow(0 20px 40px var(--shadow-medium));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-15px);
    }
}

.features {
    padding: 5rem 0;
    text-align: center;
}

.features h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: white;
    border-radius: 1.25rem;
    padding: 2rem 1.5rem;
    box-shadow: 0 4px 20px var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid var(--pale-blue);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow-medium);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--light-text);
    line-height: 1.5;
}

.how-it-works {
    padding: 5rem 0;
    text-align: center;
}

.how-it-works h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 3rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.step {
    background: white;
    border-radius: 1.25rem;
    padding: 2.5rem 2rem;
    box-shadow: 0 4px 20px var(--shadow-light);
    border: 1px solid var(--pale-blue);
    position: relative;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 15px var(--shadow-medium);
}

.step h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 0.75rem;
}

.step p {
    font-size: 1rem;
    color: var(--light-text);
}

.faq {
    padding: 5rem 0;
    text-align: center;
}

.faq h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 3rem;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}

.faq-item {
    background: white;
    border-radius: 1rem;
    margin-bottom: 0.75rem;
    box-shadow: 0 2px 10px var(--shadow-light);
    border: 1px solid var(--pale-blue);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 4px 20px var(--shadow-medium);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
}

.faq-question h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--dark-text);
    margin: 0;
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-blue);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

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

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

.faq-answer p {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.95rem;
    color: var(--light-text);
    line-height: 1.7;
}

footer {
    background: linear-gradient(180deg, var(--white), var(--pale-blue));
    padding: 3rem 2rem;
    text-align: center;
    margin-top: 3rem;
    border-top: 1px solid var(--lighter-blue);
}

footer p {
    color: var(--medium-text);
    font-size: 1rem;
    font-weight: 500;
}

footer .disclaimer {
    font-size: 0.85rem;
    color: var(--light-text);
    margin-top: 0.5rem;
    font-weight: 400;
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text p {
        max-width: 100%;
    }

    .hero-image {
        order: -1;
    }

    .hero-image img {
        max-width: 250px;
    }

    .download-buttons {
        justify-content: center;
    }

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

    .steps {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
}

@media (max-width: 640px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
}