:root {
    --primary-color: #10b981;
    --secondary-color: #0ea5e9;
    --accent-color: #f59e0b;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --white: #ffffff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 1.8rem;
}

.logo-img {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.footer-logo-img {
    height: 30px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

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

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

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0ea5e9 0%, #10b981 100%);
    color: var(--white);
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero-shape {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--white);
    clip-path: polygon(0 50%, 100% 0, 100% 100%, 0 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: linear-gradient(45deg, #fff, #a7f3d0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.85;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.btn {
    padding: 15px 35px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.stat h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.stat p {
    opacity: 0.85;
    font-size: 1rem;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--light-bg);
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-light);
}

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

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 2.5rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-card > p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-list i {
    color: var(--primary-color);
}

/* How It Works Section */
.how-it-works {
    padding: 100px 0;
    background: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: var(--shadow);
}

.step-icon {
    width: 120px;
    height: 120px;
    margin: 40px auto 20px;
    background: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.step-card:hover .step-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.step-icon i {
    font-size: 3rem;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.step-card:hover .step-icon i {
    color: var(--white);
}

.step-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.step-card p {
    color: var(--text-light);
}

/* System Architecture Section */
.system-architecture {
    padding: 100px 0;
    background: var(--dark-bg);
    color: var(--white);
}

.system-architecture .section-header h2,
.system-architecture .section-header p {
    color: var(--white);
}

.architecture-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.architecture-diagram {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.arch-layer {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.arch-box {
    flex: 1;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.arch-box:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.arch-box i {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.arch-box h4 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.arch-box p {
    opacity: 0.7;
    font-size: 0.9rem;
}

.arch-connector {
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.arch-connector::after {
    content: '↓';
    font-size: 2rem;
    color: var(--primary-color);
}

.architecture-features {
    display: grid;
    gap: 25px;
}

.arch-feature {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.arch-feature i {
    font-size: 2rem;
    color: var(--primary-color);
    min-width: 50px;
}

.arch-feature h4 {
    margin-bottom: 5px;
}

.arch-feature p {
    opacity: 0.7;
}

/* Tech Stack Section */
.tech-stack {
    padding: 100px 0;
    background: var(--light-bg);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
}

.tech-item {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.tech-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.tech-item i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.tech-item h4 {
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.tech-item p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Download Section */
.download {
    padding: 100px 0;
    background: var(--white);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.download-card {
    background: linear-gradient(135deg, #0ea5e9 0%, #10b981 100%);
    padding: 40px;
    border-radius: 25px;
    text-align: center;
    color: var(--white);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-10px);
}

.download-icon {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    backdrop-filter: blur(10px);
}

.download-icon i {
    font-size: 3rem;
}

.download-icon.staff {
    background: rgba(16, 185, 129, 0.2);
}

.download-card h3 {
    font-size: 2rem;
    margin-bottom: 15px;
}

.download-desc {
    margin-bottom: 25px;
    opacity: 0.9;
}

.app-details {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 25px;
    backdrop-filter: blur(10px);
}

.detail-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 0;
}

.btn-download {
    background: var(--white);
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 18px 40px;
    margin: 10px 0;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.btn-download.staff-btn {
    color: var(--secondary-color);
}

.download-note {
    margin-top: 15px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.installation-guide {
    background: var(--light-bg);
    padding: 40px;
    border-radius: 20px;
    max-width: 700px;
    margin: 0 auto;
}

.installation-guide h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
    text-align: center;
}

.installation-guide ol {
    padding-left: 25px;
}

.installation-guide li {
    padding: 10px 0;
    color: var(--text-dark);
}

/* Footer */
.footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-brand i {
    font-size: 2rem;
    color: var(--primary-color);
}

.footer-brand h3 {
    font-size: 1.5rem;
}

.footer-section p {
    opacity: 0.8;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

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

.footer-section li {
    padding: 8px 0;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-section li i {
    color: var(--primary-color);
    margin-right: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-stats {
        gap: 2rem;
    }

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

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

    .section-header h2 {
        font-size: 2rem;
    }

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

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

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .stat h3 {
        font-size: 2rem;
    }

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