/* CSS Variables & Reset */
:root {
    --color-bg: #ffffff;
    --color-text: #111111;
    --color-text-light: #555555;
    --color-accent: #f5f5f3;
    --color-border: #e0e0e0;

    --font-primary: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    --transition-fast: 0.3s ease;
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
    border-radius: 0;
    cursor: pointer;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-text);
}

.btn-hero {
    background-color: var(--color-bg);
    color: var(--color-text);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.btn-hero:hover {
    background-color: rgba(255, 255, 255, 0.8);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-text);
    margin-top: var(--spacing-md);
}

.btn-outline:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    transition: background-color var(--transition-fast), padding var(--transition-fast);
    color: white;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: var(--color-text);
    padding: 1rem 2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header.scrolled .btn-primary {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.header-logo {
    height: 40px;
    width: auto;
}

.header:not(.scrolled) .header-logo {
    filter: brightness(0) invert(1);
    -webkit-filter: brightness(0) invert(1);
}

.header:not(.scrolled) .btn-primary {
    background-color: #ffffff;
    color: #000000;
}

.header:not(.scrolled) .btn-primary:hover {
    background-color: transparent;
    color: #ffffff;
    border-color: #ffffff;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-color: #000;
}

.hero-img {
    width: 100%;
    height: 100%;
    /* Use object-fit when replacing with real image */
    background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.7)), url('../images/1.avif');
    background-size: cover;
    background-position: center 20%;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 10;
    padding: 0 2rem;
    max-width: 900px;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.hero-subtitle {
    font-size: 2.5rem;
    font-weight: 300;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

.hero-description {
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.8;
}

.hero-small {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    opacity: 0.6;
    margin-top: var(--spacing-md);
}

/* Split Section (Intro) */
.split-section {
    display: flex;
    min-height: 80vh;
    padding: var(--spacing-xl) 0;
}

.split-text {
    flex: 1;
    padding: 0 4rem 0 10%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.split-text h2 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

.split-text p {
    font-size: 1.2rem;
    color: var(--color-text-light);
    max-width: 500px;
}

.split-image {
    flex: 1;
    height: auto;
    min-height: 500px;
    background-image: url('../images/2.avif');
    background-size: cover;
    background-position: center;
}

/* Philosophy Section */
.philosophy {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-accent);
}

.philosophy-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--color-border);
}

.philosophy-item {
    display: flex;
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-fast);
}

.philosophy-item:hover {
    padding-left: 1rem;
}

.philosophy-item .num {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-text-light);
    width: 100px;
    flex-shrink: 0;
}

.philosophy-item .content h3 {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: var(--spacing-xs);
}

.philosophy-item .content p {
    font-size: 1.1rem;
    color: var(--color-text-light);
}

/* Courses Section */
.courses {
    padding: var(--spacing-xl) 0;
}

.section-intro {
    font-size: 1.5rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
}

.course-category {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-text);
    display: inline-block;
}

.course-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.course-card {
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    transition: var(--transition-fast);
}

.course-card:hover {
    border-color: var(--color-text);
    transform: translateY(-5px);
}

.course-header {
    margin-bottom: var(--spacing-md);
}

.course-header h4 {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 500;
}

.course-meta span {
    background-color: var(--color-accent);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
}

.course-meta .price {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.course-desc {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.course-topics {
    list-style: none;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.course-topics li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
    color: var(--color-text-light);
}

.course-topics li:last-child {
    border-bottom: none;
}

.course-topics li::before {
    content: "— ";
    color: var(--color-text);
}

.highlight-box {
    background-color: var(--color-accent);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.highlight-box h5 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

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

.highlight-list li {
    padding: 0.3rem 0;
    display: flex;
    align-items: center;
}

.highlight-list .hl-num {
    font-weight: 600;
    margin-right: 1rem;
    color: var(--color-text-light);
}

/* Audience Section */
.audience {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-accent);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.audience-item h3 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
}

.audience-item p {
    color: var(--color-text-light);
}

/* Visual Break */
.visual-break {
    position: relative;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.break-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/3.avif');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    /* Parallax effect */
}

.break-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.break-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 0 2rem;
}

.break-content h2 {
    color: white;
    font-size: 3rem;
    font-weight: 300;
    font-style: italic;
    max-width: 800px;
}

/* Final CTA */
.final-cta {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.final-cta h2 {
    font-size: 3.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
}

.final-cta p {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
}

.footer-logo {
    height: 60px;
    width: auto;
}

.footer-brand .tagline {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: 0.2rem;
}

.footer-contact {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-contact a,
.footer-contact span {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.footer-contact a:hover {
    color: var(--color-text-light);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .hero-subtitle {
        font-size: 2rem;
    }

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

@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 4rem;
    }

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

    .split-section {
        flex-direction: column;
    }

    .split-text {
        padding: var(--spacing-lg) 2rem;
    }

    .split-image {
        min-height: 400px;
    }

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

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .footer-contact {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .philosophy-item {
        flex-direction: column;
    }

    .philosophy-item .num {
        margin-bottom: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .btn:not(.header .btn) {
        width: 100%;
    }

    .header {
        padding: 1rem;
    }

    .header .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .header-logo {
        height: 30px;
    }
}