:root {
    --primary: #007bff;
    --primary-dark: #0056b3;
    --primary-light: #e7f1ff;
    --text-main: #1a1a1a;
    --text-muted: #666;
    --bg-light: #f8fbff;
    --white: #ffffff;
    --shadow-soft: 0 10px 30px rgba(0, 123, 255, 0.08);
    --shadow-heavy: 0 20px 50px rgba(0, 0, 0, 0.1);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    background-color: var(--white);
    line-height: 1.6;
}

h1,
h2,
h3 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
}

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

/* Header */
/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero-text.reveal {
    transition-delay: 0.2s;
}

.hero-visual.reveal {
    transition-delay: 0.4s;
}

.main-header {
    height: 90px;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.main-header .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-text {
    font-family: 'Poppins', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
    display: flex;
    align-items: center;
}

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

.nav {
    display: flex;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Buttons */
.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 1rem 2.2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
}

.btn-outline {
    display: inline-block;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    padding: 8rem 0;
    background: radial-gradient(circle at 70% 30%, var(--primary-light) 0%, var(--white) 100%);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
}

.hero-text h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 2rem;
    color: var(--text-main);
}

.hero-text h1 span {
    color: var(--primary);
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 500px;
}

.badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.hero-visual .visual-card {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
    cursor: pointer;
    transition: var(--transition);
}

.hero-visual .visual-card:hover {
    transform: scale(1.02);
}

.preview-img {
    width: 100%;
    display: block;
}

.click-hint {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    backdrop-filter: blur(5px);
}

/* Presentation Section */
.presentation-section {
    padding: 8rem 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.presentation-main {
    max-width: 1000px;
    margin: 0 auto;
}

.presentation-card {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
    cursor: pointer;
    background: var(--white);
}

.presentation-card img {
    width: 100%;
    display: block;
    transition: var(--transition);
}

.presentation-card:hover img {
    transform: scale(1.01);
}

.presentation-card .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 123, 255, 0.4);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.presentation-card:hover .overlay {
    opacity: 1;
}

.overlay i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.overlay span {
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Features */
.features {
    padding: 6rem 0;
}

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

.feature-card {
    padding: 3rem;
    border-radius: var(--border-radius);
    background: var(--white);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-soft);
    transform: translateY(-5px);
    border-color: var(--primary-light);
}

.icon-box {
    width: 60px;
    height: 60px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
}

/* Footer */
.main-footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    cursor: zoom-out;
    backdrop-filter: blur(8px);
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    position: relative;
    cursor: default;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    border-radius: 8px;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

.close-btn {
    position: absolute;
    top: 2rem;
    right: 2rem;
    color: white;
    font-size: 3rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    transform: scale(1.1);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 3rem;
    }

    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .logo-text {
        font-size: 1.25rem;
    }
}