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

:root {
    --primary: #E87511;
    --secondary: #F4A524;
    --dark: #C25E0A;
    --white: #ffffff;
    --light-bg: #FFF9F3;
    --text-dark: #1a1a2e;
    --text-muted: #5a5a6e;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links li a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--primary);
    background: var(--light-bg);
}

.btn-login {
    background: var(--primary) !important;
    color: var(--white) !important;
    padding: 10px 22px !important;
    border-radius: 50px !important;
    font-weight: 600 !important;
    transition: var(--transition);
}

.btn-login:hover {
    background: var(--dark) !important;
    transform: translateY(-1px);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger span {
    width: 26px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* ===== HERO ===== */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--dark) 100%);
    padding: 100px 24px 80px;
    text-align: center;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 80%, rgba(255,255,255,0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255,255,255,0.06) 0%, transparent 50%);
    pointer-events: none;
}

/* ===== FILTER TABS ===== */
.programs-section {
    padding: 80px 0;
    background: var(--white);
}

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
}

.filter-btn {
    padding: 10px 24px;
    border: 2px solid #e8e8e8;
    border-radius: 50px;
    background: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

/* ===== PROGRAMS GRID ===== */
.programs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.program-card {
    background: var(--white);
    border: 1px solid #f0f0f0;
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.program-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

.program-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.program-card:hover::before {
    opacity: 1;
}

.program-card.hidden {
    display: none;
}

.program-card.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

.program-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.program-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.program-age,
.program-duration {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 50px;
    margin-right: 8px;
    margin-bottom: 12px;
}

.program-age {
    background: #FFF3E6;
    color: var(--primary);
}

.program-duration {
    background: #F0F4FF;
    color: #4A6FA5;
}

.program-desc {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

.btn-enroll {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--primary), var(--dark));
    color: var(--white);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    align-self: flex-start;
}

.btn-enroll:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(232, 117, 17, 0.35);
}

/* ===== CURRICULUM ===== */
.curriculum-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.curriculum-path {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.curriculum-path::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    border-radius: 3px;
}

.path-step {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 36px;
    position: relative;
}

.path-step:last-child {
    margin-bottom: 0;
}

.path-marker {
    width: 50px;
    height: 50px;
    min-width: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    position: relative;
    z-index: 2;
    box-shadow: 0 4px 12px rgba(232, 117, 17, 0.3);
}

.path-content {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    flex: 1;
}

.path-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.path-content p {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== LEARNING APPROACH ===== */
.approach-section {
    padding: 80px 0;
    background: var(--white);
}

.approach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}

.approach-card {
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.approach-card:hover {
    border-color: var(--secondary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.approach-icon {
    font-size: 2.8rem;
    margin-bottom: 16px;
}

.approach-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.approach-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== MATERIALS ===== */
.materials-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.material-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: var(--transition);
    border: 1px solid #f0f0f0;
}

.material-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.material-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.material-card h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.material-level {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: 50px;
    background: #FFF3E6;
    color: var(--primary);
    margin-bottom: 10px;
}

.material-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== CTA ===== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--dark));
    text-align: center;
}

.cta-content h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-cta {
    display: inline-block;
    padding: 14px 36px;
    background: var(--white);
    color: var(--primary);
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-cta-secondary {
    display: inline-block;
    padding: 14px 36px;
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-cta-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
    transform: translateY(-2px);
}

/* ===== FOOTER ===== */
.footer {
    background: #1a1a2e;
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
}

.footer-col p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
}

.footer-col h4 {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--secondary);
    padding-left: 4px;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.social-links a {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50px;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-contact {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 80px 32px 40px;
        gap: 4px;
        box-shadow: var(--shadow-lg);
        transition: right 0.3s ease;
        overflow-y: auto;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links li a {
        display: block;
        padding: 12px 16px;
        font-size: 1rem;
    }

    .nav-login {
        margin-top: 12px;
    }

    .hero {
        padding: 70px 20px 60px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

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

    .section-title {
        font-size: 1.7rem;
    }

    .curriculum-path::before {
        left: 20px;
    }

    .path-marker {
        width: 42px;
        height: 42px;
        min-width: 42px;
        font-size: 0.95rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .cta-content h2 {
        font-size: 1.6rem;
    }

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

@media (max-width: 480px) {
    .filter-tabs {
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .program-card {
        padding: 24px 20px;
    }

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