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

:root {
    /* Palette: green -> blue -> yellow */
    --accent-1: #22c55e; /* green */
    --lavender: #06b6d4; /* primary blue (used as legacy 'lavender') */
    --accent-3: #fbbf24; /* yellow */
    --accent-rgb: 6, 182, 212; /* rgb for --lavender */
    --dark-bg: linear-gradient(180deg, #042833 0%, #021523 100%);
    --text-dark: #083344;
    --white: #ffffff;
    --light-bg: #f7fdf9;
    --gradient: linear-gradient(135deg, var(--accent-1) 0%, var(--lavender) 60%, var(--accent-3) 100%);
}

html {
    scroll-behavior: smooth;
}

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

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

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(20, 20, 65, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(var(--accent-rgb), 0.14);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    font-family: 'Poppins', sans-serif;
}

.logo i {
    color: var(--lavender);
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--lavender);
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--lavender);
}

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

.nav-link:hover {
    color: var(--lavender);
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--lavender);
    padding: 0.5rem 1.5rem !important;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: var(--lavender);
    color: var(--white);
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.45);
}

.btn-primary {
    background: var(--lavender);
    padding: 0.5rem 1.5rem !important;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: var(--lavender);
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.55);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--white);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    /* image layered under the gradient for subtle texture */
    background-image: var(--gradient), url('images/hero-bg.svg');
    background-size: cover, cover;
    background-position: center center;
    background-repeat: no-repeat, no-repeat;
    background-blend-mode: overlay;
    padding: 120px 20px 80px;
    position: relative;
    overflow: hidden;
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.18) 0%, transparent 70%);
    animation: float 20s infinite ease-in-out;
}

.particle:nth-child(1) {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.particle:nth-child(3) {
    bottom: 10%;
    left: 30%;
    animation-delay: 10s;
}

.particle:nth-child(4) {
    top: 30%;
    right: 30%;
    animation-delay: 15s;
}

.particle:nth-child(5) {
    bottom: 30%;
    right: 20%;
    animation-delay: 7s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInLeft 1s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1.5rem;
    font-family: 'Poppins', sans-serif;
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

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

.btn-primary:hover {
    background: var(--lavender);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(var(--accent-rgb), 0.36);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--lavender);
}

.btn-secondary:hover {
    background: var(--lavender);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(var(--accent-rgb), 0.36);
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat h3 {
    font-size: 2rem;
    color: var(--lavender);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.hero-image {
    animation: fadeInRight 1s ease;
}

.hero-image svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(var(--accent-rgb), 0.28));
    animation: floatSVG 6s infinite ease-in-out;
}

@keyframes floatSVG {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== ABOUT SECTION ===== */
.about {
    padding: 100px 20px;
    background: var(--light-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--lavender);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #666;
    margin-top: 1.5rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.about-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.4s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 4px;
    background: var(--gradient);
    transition: left 0.4s ease;
}

.about-card:hover::before {
    left: 0;
}

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(var(--accent-rgb), 0.16);
    border-color: var(--lavender);
}

.about-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--white);
    transition: all 0.4s ease;
}

.about-card:hover .about-icon {
    transform: rotateY(360deg);
}

.about-card h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
}

.about-card p {
    color: #666;
    line-height: 1.7;
}

.about-card.animate {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

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

/* ===== COURSES SECTION ===== */
.courses {
    padding: 100px 20px;
    background: var(--dark-bg);
}

.courses .section-title,
.courses .section-subtitle {
    color: var(--white);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.course-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s ease;
    border: 1px solid rgba(var(--accent-rgb), 0.16);
    opacity: 0;
}

.course-card.animate {
    animation: fadeInUp 0.6s ease forwards;
}

.course-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 50px rgba(var(--accent-rgb), 0.36);
    border-color: var(--lavender);
}

.course-thumbnail {
    height: 200px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.course-icon {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.9);
    transition: all 0.4s ease;
}

.course-card:hover .course-icon {
    transform: scale(1.2) rotate(10deg);
}

.course-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--lavender);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.course-content {
    padding: 1.5rem;
}

.course-content h3 {
    font-size: 1.3rem;
    color: var(--white);
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
}

.course-content p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.course-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.course-meta i {
    color: var(--lavender);
}

.btn-course {
    width: 100%;
    background: var(--lavender);
    color: var(--white);
    padding: 0.8rem;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-course:hover {
    background: var(--lavender);
    box-shadow: 0 5px 20px rgba(var(--accent-rgb), 0.45);
}

/* ===== CONTACT SECTION ===== */
.contact {
    padding: 100px 20px;
    background: var(--light-bg);
    position: relative;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    margin-top: 3rem;
}

.contact-info {
    background: var(--dark-bg);
    padding: 3rem 2rem;
    border-radius: 20px;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.contact-info::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.16) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
    position: relative;
    z-index: 1;
}

.contact-info > p {
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.8);
    position: relative;
    z-index: 1;
}

.info-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--lavender);
    margin-top: 0.3rem;
}

.info-item h4 {
    margin-bottom: 0.3rem;
    font-size: 1.1rem;
}

.info-item p {
    color: rgba(255, 255, 255, 0.7);
}

.contact-form {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 20px;
    border: 2px solid rgba(var(--accent-rgb), 0.16);
}

.contact-form.animate {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid rgba(var(--accent-rgb), 0.24);
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--lavender);
    box-shadow: 0 0 15px rgba(var(--accent-rgb), 0.16);
}

.form-group textarea {
    resize: vertical;
}

/* ===== REGISTER SECTION ===== */
.register {
    padding: 100px 20px;
    background: var(--dark-bg);
}

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

.register-content {
    color: var(--white);
}

.register-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    font-family: 'Poppins', sans-serif;
}

.register-content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
}

.register-benefits {
    list-style: none;
}

.register-benefits li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.register-benefits i {
    color: var(--lavender);
    font-size: 1.2rem;
    width: 24px;
}

.register-form {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 20px;
    border: 2px solid rgba(var(--accent-rgb), 0.24);
}

.register-form.animate {
    animation: fadeInRight 0.8s ease forwards;
    opacity: 0;
}

.register-form h3 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 2rem;
    font-family: 'Poppins', sans-serif;
}

.btn-block {
    width: 100%;
    margin-top: 1rem;
}

.form-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.form-footer a {
    color: var(--lavender);
    text-decoration: none;
    font-weight: 600;
}

.form-footer a:hover {
    text-decoration: underline;
}

/* ===== FOOTER ===== */
.footer {
    background: #0a0a2e;
    color: var(--white);
    padding: 3rem 20px 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-top: 1rem;
    line-height: 1.7;
}

.footer-links h4,
.footer-social h4 {
    margin-bottom: 1.5rem;
    color: var(--lavender);
}

.footer-links a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--lavender);
    padding-left: 5px;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    width: 40px;
    height: 40px;
    background: rgba(var(--accent-rgb), 0.18);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all 0.3s ease;
}

.social-icons a:hover {
    background: var(--lavender);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(var(--accent-rgb), 0.36);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 70%;
        height: calc(100vh - 70px);
        background: rgba(20, 20, 65, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        padding: 2rem;
        transition: right 0.4s ease;
        gap: 1.5rem;
    }

    .nav-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-stats {
        justify-content: center;
    }

    .contact-container,
    .register-container,
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .courses-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        padding: 0.8rem 1.5rem;
    }
}

/* ===== AUTH / MODAL STYLES ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
}
.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
}
.modal-content {
    position: relative;
    max-width: 420px;
    margin: 6rem auto;
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(20,20,65,0.6);
    z-index: 2100;
}
.modal-content h3 {
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
}
.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
}
.login-form .form-group input {
    background: #fff;
}

/* nav user small text */
#navUser {
    color: var(--white);
    font-weight: 600;
}

@media (max-width: 968px) {
    .modal-content { margin: 4rem 1.5rem; }
}

/* Ratings and reviews */
#reviewsList li strong { font-size: 0.98rem; }
#ratingForm input, #ratingForm select { font-size: 0.95rem; }
#ratingStars { letter-spacing: 2px; }
#ratingInfo { font-size: 0.95rem; }

/* certificate */
#certificateBtn { margin-top: 0.5rem; }
#certificateContainer { display:flex;flex-direction:column; }

/* ===== SMART CARD ANIMATIONS ===== */
[class*="card"] {
    --rx: 0deg;
    --ry: 0deg;
    --tz: 0px;
    transform: perspective(1000px) rotateX(var(--rx)) rotateY(var(--ry)) translateZ(var(--tz));
    transition: transform 520ms cubic-bezier(.22,.9,.35,1), box-shadow 520ms ease, border-color 320ms ease;
    will-change: transform;
    position: relative;
    overflow: hidden;
}

[class*="card"]:hover {
    --tz: 12px;
}

[class*="card"].is-tilting {
    box-shadow: 0 30px 80px rgba(2,6,23,0.28);
    border-color: rgba(133,76,139,0.25);
}

[class*="card"] .card-shine {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(120deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.02) 60%);
    mix-blend-mode: overlay;
    transform: translateZ(0) translateY(-20%);
    opacity: 0;
    transition: opacity 320ms ease, transform 420ms ease;
}

[class*="card"].is-tilting .card-shine {
    opacity: 1;
    transform: translateZ(0) translateY(0%);
}

/* Touch devices: fallback simple hover lift */
@media (hover: none) {
    [class*="card"] { transform: none !important; }
    [class*="card"] .card-shine { display: none; }
}