/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Color Palette */
    --color-bg: #F9F8F6;          /* Cream Background */
    --color-text: #2D2D2D;        /* Dark Gray Text */
    --color-text-muted: #666666;  /* Muted Gray for descriptions */
    --color-primary: #1DB954;     /* Luminous Green Accent */
    --color-primary-hover: #179e46;
    --color-border: rgba(45, 45, 45, 0.12); /* Fine lines border */
    
    /* Typography */
    --font-headings: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Transitions */
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

button {
    font-family: inherit;
    background: none;
    border: none;
    cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headings);
}

/* ==========================================================================
   GRID & LAYOUT UTILITIES
   ========================================================================== */
.grid-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 4rem;
}

@media (max-width: 1024px) {
    .grid-container {
        padding: 0 2rem;
    }
}

@media (max-width: 768px) {
    .grid-container {
        padding: 0 1.5rem;
    }
}

/* Fine Separators */
.section-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 0;
    width: 100%;
}

/* Green Dot Visual Accent */
.green-dot {
    color: var(--color-primary);
    display: inline-block;
    transition: var(--transition-bounce);
}

a:hover .green-dot,
h1:hover .green-dot,
h2:hover .green-dot {
    transform: scale(1.4) translateY(-2px);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 4px;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-primary);
    color: var(--color-text);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(29, 185, 84, 0.15);
}

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

.btn-secondary:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
    transform: translateY(-2px);
}

.btn-youtube {
    gap: 0.5rem;
    font-weight: 600;
}

.youtube-icon-svg {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(249, 248, 246, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 90px;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 4rem;
}

@media (max-width: 1024px) {
    .header-container {
        padding: 0 2rem;
        height: 80px;
    }
}

.logo {
    font-family: var(--font-headings);
    font-weight: 800;
    font-size: 1.6rem;
    letter-spacing: -0.5px;
    color: var(--color-text);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.btn-header-cta {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: 0.6rem 1.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 30px;
    border: 1px solid var(--color-primary);
    transition: var(--transition-smooth);
}

.btn-header-cta:hover {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-text);
    transform: translateY(-2px);
}

@media (max-width: 480px) {
    .btn-header-cta {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    opacity: 0.7;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
    opacity: 1;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.menu-icon {
    font-size: 1.3rem;
    line-height: 1;
    color: var(--color-primary);
}

@media (max-width: 850px) {
    .nav-links {
        display: none;
    }
    .menu-toggle {
        display: flex;
    }
}

/* ==========================================================================
   MOBILE MENU OVERLAY
   ========================================================================== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 200;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    transform: translateY(-20px);
}

.mobile-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 1.5rem;
}

.menu-close {
    font-size: 2.5rem;
    line-height: 1;
    color: var(--color-text);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 4rem;
}

.mobile-nav-link {
    font-family: var(--font-headings);
    font-size: 2rem;
    font-weight: 700;
    opacity: 0.8;
}

.mobile-nav-link:hover {
    opacity: 1;
    color: var(--color-primary);
    padding-left: 10px;
}

.mobile-menu-footer {
    margin-top: auto;
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.whatsapp-btn {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    padding-top: 160px;
    padding-bottom: 5rem;
}

@media (max-width: 768px) {
    .hero-section {
        padding-top: 120px;
        padding-bottom: 3rem;
    }
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 991px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

.hero-badge {
    display: inline-block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-headings);
    font-size: 3.5rem;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -1.5px;
    margin-bottom: 1.5rem;
}

@media (max-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
}

@media (max-width: 600px) {
    .hero-title {
        font-size: 2.3rem;
    }
}

.hero-subtitle {
    font-size: 1.4rem;
    color: var(--color-text-muted);
    font-weight: 400;
    margin-bottom: 3rem;
}

@media (max-width: 600px) {
    .hero-subtitle {
        font-size: 1.15rem;
        margin-bottom: 2rem;
    }
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.hero-image-block {
    position: relative;
    width: 100%;
}

.image-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(45, 45, 45, 0.08);
    background-color: rgba(45, 45, 45, 0.02);
    aspect-ratio: 4/3;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-image-block:hover .hero-image {
    transform: scale(1.03);
}

/* Editorial Footer Columns */
.editorial-footer {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 6rem;
    border-top: 1px solid var(--color-border);
    padding-top: 3rem;
}

@media (max-width: 850px) {
    .editorial-footer {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-top: 4rem;
    }
}

.editorial-col {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.col-num {
    font-family: var(--font-headings);
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 700;
}

.col-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ==========================================================================
   SECTION COMMON STYLES
   ========================================================================== */
.section-header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 5rem;
}

@media (max-width: 768px) {
    .section-header {
        margin-bottom: 3rem;
    }
}

.section-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--color-primary);
    font-weight: 600;
}

.section-title {
    font-family: var(--font-headings);
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    max-width: 800px;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 1.8rem;
    }
}

/* ==========================================================================
   VALUES SECTION (PHILOSOPHIE)
   ========================================================================== */
.values-section {
    padding: 7rem 0;
}

@media (max-width: 768px) {
    .values-section {
        padding: 4rem 0;
    }
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

@media (max-width: 900px) {
    .values-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

.value-card {
    border-top: 1px solid var(--color-border);
    padding-top: 2rem;
    transition: var(--transition-smooth);
}

.value-card:hover {
    border-top-color: var(--color-primary);
    transform: translateY(-5px);
}

.value-icon {
    color: var(--color-text);
    margin-bottom: 1.5rem;
    transition: var(--transition-smooth);
}

.minimal-svg {
    width: 36px;
    height: 36px;
}

.value-card:hover .value-icon {
    color: var(--color-primary);
    transform: scale(1.1);
}

.value-card h3 {
    font-family: var(--font-headings);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.value-sub {
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.value-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==========================================================================
   COURS SECTION
   ========================================================================== */
.courses-section {
    padding: 7rem 0;
}

@media (max-width: 768px) {
    .courses-section {
        padding: 4rem 0;
    }
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    margin-bottom: 6rem;
}

@media (max-width: 850px) {
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        margin-bottom: 4rem;
    }
}

.course-card {
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 3.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

@media (max-width: 600px) {
    .course-card {
        padding: 2rem;
    }
}

.course-card:hover {
    border-color: var(--color-text);
    box-shadow: 0 15px 30px rgba(45, 45, 45, 0.03);
    transform: translateY(-5px);
}

.course-card.highlighted {
    background-color: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
}

.course-card.highlighted:hover {
    box-shadow: 0 20px 40px rgba(45, 45, 45, 0.15);
}

.course-tag {
    display: inline-block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.course-card.highlighted .course-tag {
    color: var(--color-primary);
}

.course-header h3 {
    font-family: var(--font-headings);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.course-intro {
    font-size: 1.05rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.course-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.course-features li {
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.course-features li span {
    color: var(--color-primary);
    font-weight: bold;
}

/* Subjects Section */
.subjects-container {
    border-top: 1px solid var(--color-border);
    padding-top: 5rem;
}

.subjects-title {
    font-family: var(--font-headings);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

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

@media (max-width: 900px) {
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.subject-card {
    background-color: #FFFFFF; /* Card contrast on cream background */
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: var(--transition-smooth);
}

.subject-card:hover {
    border-color: var(--color-text);
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(45, 45, 45, 0.04);
}

.subject-icon-box {
    color: var(--color-primary);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(29, 185, 84, 0.05); /* very light green background circle */
    border-radius: 50%;
    margin-bottom: 0.5rem;
    transition: var(--transition-smooth);
}

.subject-card:hover .subject-icon-box {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

.subject-icon-svg {
    width: 24px;
    height: 24px;
}

.subject-card h4 {
    font-family: var(--font-headings);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
}

.subject-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    flex-grow: 1;
}

.subject-action-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    display: inline-flex;
    align-items: center;
    border-bottom: 1px solid transparent;
    align-self: flex-start;
    transition: var(--transition-smooth);
    margin-top: 1rem;
}

.subject-card:hover .subject-action-link {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    padding-left: 5px;
}

/* ==========================================================================
   YOUTUBE SECTION
   ========================================================================== */
.youtube-section {
    padding: 7rem 0;
    text-align: center;
}

@media (max-width: 768px) {
    .youtube-section {
        padding: 5rem 0;
    }
}

.youtube-container-simple {
    max-width: 800px;
    margin: 0 auto;
}

.youtube-info-simple {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.youtube-title {
    font-family: var(--font-headings);
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1.5px;
}

@media (max-width: 768px) {
    .youtube-title {
        font-size: 2.2rem;
    }
}

.youtube-desc {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.youtube-meta-simple {
    margin-top: 1rem;
}

.btn-youtube-large {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 4px;
    background-color: #FF0000; /* Red for YouTube */
    color: #FFF;
    transition: var(--transition-smooth);
    box-shadow: 0 10px 20px rgba(255, 0, 0, 0.15);
}

.btn-youtube-large:hover {
    background-color: #D30000;
    transform: translateY(-2px);
    box-shadow: 0 15px 25px rgba(255, 0, 0, 0.25);
}

/* ==========================================================================
   CONTACT SECTION ("LET'S TALK" EDITORIAL STYLE)
   ========================================================================== */
.contact-section {
    padding: 8rem 0;
    background-color: #F3F1ED; /* Slightly darker cream for contrast */
}

@media (max-width: 768px) {
    .contact-section {
        padding: 5rem 0;
    }
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 5rem;
}

@media (max-width: 991px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
}

.contact-hero-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-large-title {
    font-family: var(--font-headings);
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-top: 1rem;
    margin-bottom: 3rem;
}

@media (max-width: 1200px) {
    .contact-large-title {
        font-size: 3.2rem;
    }
}

@media (max-width: 600px) {
    .contact-large-title {
        font-size: 2.2rem;
        margin-bottom: 2rem;
    }
}

.huge-link-button {
    font-family: var(--font-headings);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text);
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 2px solid var(--color-text);
    padding-bottom: 0.75rem;
    transition: var(--transition-smooth);
}

@media (max-width: 600px) {
    .huge-link-button {
        font-size: 1.3rem;
    }
}

.huge-link-button:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    padding-left: 10px;
}

.arrow-svg {
    width: 28px;
    height: 28px;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.huge-link-button:hover .arrow-svg {
    transform: translateX(10px);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    border-left: 1px solid var(--color-border);
    padding-left: 4rem;
}

@media (max-width: 991px) {
    .contact-details {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--color-border);
        padding-top: 3rem;
    }
}

.detail-block h5 {
    font-family: var(--font-headings);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.detail-block p {
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

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

.detail-subtext {
    font-size: 0.9rem !important;
    font-weight: 400 !important;
    color: var(--color-text-muted);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    background-color: var(--color-text);
    color: var(--color-bg);
    padding: 4rem 0;
    border-top: 1px solid rgba(249, 248, 246, 0.05);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-family: var(--font-headings);
    font-weight: 800;
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    font-size: 0.9rem;
    opacity: 0.6;
}

.footer-right {
    text-align: right;
    font-size: 0.85rem;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .footer-right {
        text-align: left;
    }
}

.footer-credits {
    font-size: 0.8rem;
    opacity: 0.5;
    margin-top: 0.5rem;
}

/* ==========================================================================
   ANIMATIONS & EFFECTS
   ========================================================================== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ==========================================================================
   STAGGERED ENTRANCE & NEW ANIMATIONS
   ========================================================================== */

/* Page Load Animation for Hero Section */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.96);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.hero-badge {
    animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-title {
    opacity: 0;
    animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.15s forwards;
}

.hero-subtitle {
    opacity: 0;
    animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
}

.hero-actions {
    opacity: 0;
    animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.45s forwards;
}

.hero-image-block {
    opacity: 0;
    animation: fadeInScale 1.4s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

/* Staggered Entrance for Cards on Scroll */
.value-card, .course-card, .subject-card {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.4s ease,
                background-color 0.4s ease,
                box-shadow 0.4s ease;
}

.value-card.visible-child, .course-card.visible-child, .subject-card.visible-child {
    opacity: 1;
    transform: translateY(0);
}