/* ==================== GOOGLE FONTS ==================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Colors */
    --color-bg: #121212;
    --color-surface: #1E1E1E;
    --color-primary: #4A90E2;
    --color-text-primary: #E0E0E0;
    --color-text-secondary: #888888;
    --color-border: #333333;
    --color-white: #FFFFFF;

    /* Fonts */
    --font-main: 'Inter', sans-serif;

    /* Other */
    --header-height: 4.5rem;
    --border-radius: 8px;
    --transition-speed: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    padding-top: var(--header-height);
}

ul {
    list-style: none;
}

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

h1, h2, h3, h4 {
    font-weight: 600;
}

.container {
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

/* ==================== HEADER ==================== */
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-speed);
}

.header--scrolled {
    border-color: var(--color-border);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.header__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.header__nav-list {
    display: flex;
    gap: 2.5rem;
}

.header__nav-link {
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-speed);
}

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

.header__burger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-primary);
}

/* ==================== FOOTER ==================== */
.footer {
    background-color: var(--color-surface);
    padding: 4rem 0 0;
    border-top: 1px solid var(--color-border);
}

.footer__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: inline-block;
    margin-bottom: 1rem;
}

.footer__description {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

.footer__title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-text-primary);
}

.footer__list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer__link {
    color: var(--color-text-secondary);
    transition: color var(--transition-speed);
}

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

.footer__list--contacts li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer__icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.footer__text {
    color: var(--color-text-secondary);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ==================== RESPONSIVENESS ==================== */
@media (max-width: 992px) {
    .header__nav {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-surface);
        transition: right var(--transition-speed);
        padding: 2rem;
    }

    .header__nav.is-active {
        right: 0;
    }

    .header__nav-list {
        flex-direction: column;
        align-items: center;
        gap: 3rem;
    }

    .header__nav-link {
        font-size: 1.2rem;
        color: var(--color-text-primary);
    }

    .header__burger {
        display: block;
    }
}

/* ==================== HERO ==================== */
.hero {
    position: relative;
    height: calc(100vh - var(--header-height));
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero__particles-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: contentFadeInUp 1s var(--transition-speed) forwards;
    opacity: 0;
}

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

.hero__title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.hero__subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
}

.hero__cta-button {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.3);
}

.hero__cta-button:hover {
    transform: translateY(-4px);
    box-shadow: 0 0 30px rgba(74, 144, 226, 0.5);
}


/* ==================== HERO RESPONSIVENESS ==================== */
@media (max-width: 768px) {
    .hero__title {
        font-size: 2.5rem;
    }
    .hero__subtitle {
        font-size: 1.1rem;
    }
}

/* ==================== COURSES ==================== */
.courses {
    padding: 6rem 0;
    background-color: var(--color-surface);
}

.courses__title, .courses__subtitle {
    text-align: center;
}

.courses__title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--color-white);
}

.courses__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 4rem auto;
}

.courses__grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.course-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: box-shadow var(--transition-speed);
}

.course-card:hover {
    box-shadow: 0 0 25px rgba(74, 144, 226, 0.1);
}

.course-card__header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    cursor: pointer;
}

.course-card__icon-wrapper {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface);
    border-radius: 50%;
}

.course-card__icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.course-card__title {
    font-size: 1.4rem;
    flex-grow: 1;
}

.course-card__toggle-btn {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0.5rem;
}

.course-card__toggle-icon {
    transition: transform var(--transition-speed);
}

.course-card.is-expanded .course-card__toggle-icon {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.course-card__body {
    display: grid;
    grid-template-rows: 0fr; /* Collapsed by default */
    transition: grid-template-rows 0.4s ease-in-out;
}

.course-card.is-expanded .course-card__body {
    grid-template-rows: 1fr; /* Expanded */
}

.course-card__content {
    overflow: hidden;
    min-height: 0;
    padding: 0 1.5rem;
}

/* This is a trick to animate the padding/margin */
.course-card.is-expanded .course-card__content {
    padding-bottom: 2rem;
}

.course-card__description {
    color: var(--color-text-secondary);
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.course-card__meta {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
    color: var(--color-text-primary);
    font-weight: 500;
}

.course-card__meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-card__meta-icon {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
}

.course-card__signup-btn {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all var(--transition-speed);
}
.course-card__signup-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.4);
}
/* ==================== PROCESS ==================== */
.process {
    padding: 6rem 0;
    background-color: var(--color-bg);
}

.process__title, .process__subtitle {
    text-align: center;
}

.process__title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--color-white);
}

.process__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 5rem auto;
}

.process__timeline {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 3rem;
    max-width: 700px;
    margin: 0 auto;
}

/* The vertical line */
.process__timeline::before {
    content: '';
    position: absolute;
    top: 2rem;
    bottom: 2rem;
    left: 39px; /* Aligns with the center of the icon wrapper */
    width: 2px;
    background-color: var(--color-border);
    transform: translateX(-50%);
}

.process__step {
    position: relative;
    padding-left: 80px; /* Space for the icon */
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.process__step.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.process__step-icon-wrapper {
    position: absolute;
    left: 0;
    top: 0;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    z-index: 2; /* Above the timeline line */
}

.process__step-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.process__step-content {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem 2rem;
    position: relative;
    overflow: hidden;
}

.process__step-number {
    position: absolute;
    top: -10px;
    right: 20px;
    font-size: 4rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.05);
    z-index: 1;
}

.process__step-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    position: relative;
    z-index: 2;
}

.process__step-description {
    color: var(--color-text-secondary);
    position: relative;
    z-index: 2;
}


/* ==================== PROCESS RESPONSIVENESS ==================== */
@media (max-width: 576px) {
    .process__timeline::before {
        left: 30px;
    }
    .process__step {
        padding-left: 60px;
    }
    .process__step-icon-wrapper {
        width: 60px;
        height: 60px;
    }
    .process__step-icon {
        width: 28px;
        height: 28px;
    }
    .process__step-title {
        font-size: 1.3rem;
    }
}

/* ==================== ABOUT US ==================== */
.about {
    padding: 6rem 0;
    background-color: var(--color-surface);
    overflow: hidden;
}

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

.about__title {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    color: var(--color-white);
}

.about__subtitle {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 2rem;
    font-weight: 600;
}

.about__description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 500px;
}

.about__description:not(:last-child) {
    margin-bottom: 1.5rem;
}

.about__team {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 450px;
}

.about__team-stack {
    position: relative;
    width: 300px;
    height: 380px;
    perspective: 1000px;
}

.about__team-card {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: transform 0.5s var(--transition-speed), box-shadow 0.5s var(--transition-speed);
}

.about__team-card-img {
    width: 100%;
    height: 75%;
    object-fit: cover;
    filter: grayscale(0.5);
    transition: filter var(--transition-speed);
}

.about__team-card-info {
    padding: 1rem;
    text-align: center;
}

.about__team-card-name {
    font-size: 1.2rem;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.about__team-card-role {
    font-size: 0.9rem;
    color: var(--color-primary);
}

/* Initial stacking */
.about__team-card:nth-child(1) { transform: rotate(5deg); z-index: 3; }
.about__team-card:nth-child(2) { transform: rotate(-2deg); z-index: 2; }
.about__team-card:nth-child(3) { transform: rotate(2deg); z-index: 1; }

/* Fan out on stack hover */
.about__team-stack:hover .about__team-card:nth-child(1) {
    transform: rotate(-15deg) translate(-100px, -20px) scale(1.05);
}
.about__team-stack:hover .about__team-card:nth-child(2) {
    transform: rotate(0deg) translate(0, 0) scale(1.1);
}
.about__team-stack:hover .about__team-card:nth-child(3) {
    transform: rotate(15deg) translate(100px, 20px) scale(1.05);
}

/* Bring individual card to front on its own hover */
.about__team-card:hover {
    transform: rotate(0) scale(1.15) !important;
    z-index: 10;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.about__team-card:hover .about__team-card-img {
    filter: grayscale(0);
}

/* ==================== ABOUT US RESPONSIVENESS ==================== */
@media (max-width: 992px) {
    .about__container {
        grid-template-columns: 1fr;
        gap: 5rem;
        text-align: center;
    }
    .about__description {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 576px) {
    .about__team-stack {
        transform: scale(0.8);
    }
}

/* ==================== CONTACT ==================== */
.contact {
    padding: 6rem 0;
    background-color: var(--color-bg);
}

.contact__title, .contact__subtitle {
    text-align: center;
}

.contact__title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--color-white);
}

.contact__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 5rem auto;
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 5rem;
}

.contact__details-title {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.contact__details-description {
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
}

.contact__details-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.contact__details-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact__details-list a {
    transition: color var(--transition-speed);
}

.contact__details-list a:hover {
    color: var(--color-primary);
}

.contact__details-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.contact__socials {
    display: flex;
    gap: 1rem;
}

.contact__social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-text-secondary);
    transition: all var(--transition-speed);
}

.contact__social-link:hover {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.contact__form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.contact__form-group {
    display: flex;
    flex-direction: column;
}

.contact__form-group--full {
    grid-column: 1 / -1;
}

.contact__form-group--submit {
    align-items: flex-start;
    justify-content: flex-end;
}

.contact__form-label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.contact__form-input {
    width: 100%;
    padding: 0.8rem 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.contact__form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

textarea.contact__form-input {
    resize: vertical;
    min-height: 120px;
}

select.contact__form-input {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23888888' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

.contact__button {
    width: 100%;
    padding: 1rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.3);
}

.contact__button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(74, 144, 226, 0.5);
}

.contact__form-message {
    grid-column: 1 / -1;
    padding: 1rem;
    margin-top: 1rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 500;
    display: none;
}
.contact__form-message.is-visible {
    display: block;
    animation: fadeIn 0.3s ease-out;
}
.contact__form-message--success {
    background-color: rgba(74, 226, 144, 0.1);
    color: #4ae290;
    border: 1px solid #4ae290;
}
.contact__form-message--error {
    background-color: rgba(226, 74, 74, 0.1);
    color: #e24a4a;
    border: 1px solid #e24a4a;
}

/* ==================== CONTACT RESPONSIVENESS ==================== */
@media (max-width: 992px) {
    .contact__grid {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 576px) {
    .contact__form {
        grid-template-columns: 1fr;
    }
}

/* ==================== COOKIE POPUP ==================== */
.cookie-popup {
    position: fixed;
    bottom: -100%; /* Hidden by default */
    left: 0;
    width: 100%;
    background-color: rgba(30, 30, 30, 0.85);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    z-index: 2000;
    transition: bottom 0.5s ease-in-out;
}

.cookie-popup.is-visible {
    bottom: 0;
}

.cookie-popup__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-popup__text {
    margin: 0;
    color: var(--color-text-secondary);
}

.cookie-popup__link {
    color: var(--color-text-primary);
    text-decoration: underline;
    font-weight: 500;
    transition: color var(--transition-speed);
}

.cookie-popup__link:hover {
    color: var(--color-primary);
}

.cookie-popup__button {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    padding: 0.8rem 1.8rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    transition: all var(--transition-speed);
}

.cookie-popup__button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.4);
}

/* ==================== POLICY PAGES ==================== */
.pages {
    padding: 5rem 0;
    background-color: var(--color-bg);
}

/* For better readability, make content area narrower */
.pages .container {
    max-width: 840px; 
}

.pages h1, .pages h2 {
    font-family: var(--font-main);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
}

.pages h1 {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: 2rem;
    line-height: 1.2;
}

.pages h2 {
    font-size: 2rem;
    margin-top: 3rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.pages p, .pages li {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.pages p {
    margin-bottom: 1.5rem;
}

.pages ul {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.pages li {
    margin-bottom: 1rem;
    list-style-type: disc;
    list-style-position: outside;
}

.pages a {
    color: var(--color-primary);
    text-decoration: underline;
    font-weight: 500;
}

.pages a:hover {
    text-decoration: none;
}

.pages strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Responsiveness for cookie popup */
@media (max-width: 768px) {
    .cookie-popup__content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}