/* --- ETAP 0: GLOBAL STYLES --- */

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

/* CSS Variables */
:root {
	--bg-color: #0a0a0a;
	--text-color: #f5f5f5;
	--accent-color: #00a9ff;
	--secondary-color: #1a1a1a;
	--border-color: #2a2a2a;
	--text-muted-color: #888888;

	--font-primary: 'Inter', sans-serif;
	--font-headings: 'Poppins', sans-serif;
}

/* Base Reset */
*,
*::before,
*::after {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

/* Body Styles */
body {
	background-color: var(--bg-color);
	color: var(--text-color);
	font-family: var(--font-primary);
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	font-family: var(--font-headings);
	font-weight: 600;
}

a {
	color: var(--text-color);
	text-decoration: none;
	transition: color 0.3s ease;
}

a:hover {
	color: var(--accent-color);
}

ul {
	list-style: none;
}

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

.container {
	width: 100%;
	max-width: 1200px;
	margin-left: auto;
	margin-right: auto;
	padding-left: 1.5rem;
	padding-right: 1.5rem;
}

/* --- ETAP 1: HEADER --- */

.header {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	z-index: 100;
	background-color: rgba(10, 10, 10, 0.8);
	backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--border-color);
	padding: 1rem 0;
}

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

.logo {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	font-family: var(--font-headings);
	font-weight: 700;
	font-size: 1.5rem;
}

.logo__img {
	width: 32px;
	height: 32px;
}

.header__nav {
	display: none;
}

.header__toggle {
	background: none;
	border: none;
	color: var(--text-color);
	cursor: pointer;
	z-index: 101;
}

/* Mobile Menu - Active state */
.header__nav--open {
	display: flex;
	position: fixed;
	top: 0;
	right: 0;
	width: 80%;
	height: 100vh;
	background-color: var(--secondary-color);
	flex-direction: column;
	align-items: center;
	justify-content: center;
	animation: slideIn 0.3s ease-out;
}

.header__nav--open .header__list {
	flex-direction: column;
	gap: 2rem;
	align-items: center;
}

.header__nav--open .header__link {
	font-size: 1.2rem;
}

@keyframes slideIn {
	from {
		transform: translateX(100%);
	}
	to {
		transform: translateX(0);
	}
}

/* Desktop styles */
@media (min-width: 992px) {
	.header__toggle {
		display: none;
	}
	.header__nav {
		display: block;
	}
	.header__list {
		display: flex;
		align-items: center;
		gap: 2rem;
	}
	.header__link {
		font-size: 1rem;
		font-weight: 500;
		position: relative;
		padding-bottom: 0.25rem;
	}
	.header__link::after {
		content: '';
		position: absolute;
		bottom: 0;
		left: 0;
		width: 0;
		height: 2px;
		background-color: var(--accent-color);
		transition: width 0.3s ease;
	}
	.header__link:hover::after {
		width: 100%;
	}
	.header__link--button {
		background-color: var(--accent-color);
		color: var(--bg-color);
		padding: 0.5rem 1.25rem;
		border-radius: 50px;
		transition: background-color 0.3s ease;
	}
	.header__link--button:hover {
		background-color: #fff;
		color: var(--bg-color);
	}
	.header__link--button::after {
		display: none;
	}
}

/* --- ETAP 2: FOOTER --- */

.footer {
	background-color: var(--secondary-color);
	padding: 4rem 0 2rem;
	border-top: 1px solid var(--border-color);
}

.footer__container {
	display: grid;
	gap: 2.5rem;
	grid-template-columns: 1fr;
}

.footer__description {
	margin-top: 1rem;
	color: var(--text-muted-color);
	max-width: 250px;
}

.footer__title {
	font-size: 1.2rem;
	margin-bottom: 1rem;
	color: var(--text-color);
}

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

.footer__link {
	color: var(--text-muted-color);
}
.footer__link:hover {
	color: var(--accent-color);
}

.footer__item--contact {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

.footer__icon {
	color: var(--accent-color);
	width: 20px;
	height: 20px;
}

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

.footer__bottom {
	text-align: center;
	margin-top: 4rem;
	padding-top: 2rem;
	border-top: 1px solid var(--border-color);
	color: var(--text-muted-color);
	font-size: 0.9rem;
}

/* Desktop styles for Footer */
@media (min-width: 768px) {
	.footer__container {
		grid-template-columns: repeat(2, 1fr);
	}
}
@media (min-width: 992px) {
	.footer__container {
		grid-template-columns: 2fr 1fr 1fr 1.5fr;
	}
}

/* --- UTILITIES (Reusable classes) --- */
.button {
	display: inline-block;
	padding: 0.8rem 2rem;
	font-family: var(--font-headings);
	font-weight: 600;
	font-size: 1rem;
	color: var(--bg-color);
	background-color: var(--accent-color);
	border: 2px solid var(--accent-color);
	border-radius: 50px;
	cursor: pointer;
	text-align: center;
	transition: all 0.3s ease;
}

.button:hover {
	background-color: transparent;
	color: var(--accent-color);
}

/* --- SECTION: HERO --- */

.hero {
	min-height: 100vh;
	display: flex;
	align-items: center;
	padding-top: 80px; /* Offset for fixed header */
}

.hero__container {
	display: grid;
	grid-template-columns: 1fr;
	gap: 3rem;
	align-items: center;
}

.hero__title {
	font-size: 1.5rem;
	font-weight: 700;
	line-height: 1.2;
	margin-bottom: 1.5rem;
	min-height: 58px;
}

/* Blinking cursor effect for typewriter */
.hero__title::after {
	content: '_';
	font-weight: 400;
	animation: blink 1s step-end infinite;
	margin-left: 5px;
}

@keyframes blink {
	from,
	to {
		color: transparent;
	}
	50% {
		color: var(--accent-color);
	}
}

.hero__subtitle {
	font-size: 1.1rem;
	color: var(--text-muted-color);
	margin-bottom: 2.5rem;
	max-width: 500px;
}

/* Hide elements for staggered animation */
.hero__subtitle,
.hero__cta {
	opacity: 0;
	transform: translateY(20px);
	transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.hero__subtitle.fade-in,
.hero__cta.fade-in {
	opacity: 1;
	transform: translateY(0);
}

.hero__cta {
	transition-delay: 0.2s; /* Make button appear slightly after subtitle */
}

.hero__image-content {
	display: flex;
	justify-content: center;
	align-items: center;
}

.hero__image {
	border-radius: 20px;
	max-width: 450px;
	width: 100%;
	border: 1px solid var(--border-color);
}

/* Desktop styles for Hero */
@media (min-width: 768px) {
	.hero__title {
		font-size: 2.5rem;
		min-height: 96px;
	}
}

@media (min-width: 992px) {
	.hero__container {
		grid-template-columns: 1fr 1fr;
		text-align: left;
	}
}

/* --- REUSABLE: SECTION STYLES --- */
.section {
	padding: 6rem 0;
}

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

.section-header__title {
	font-size: 2.5rem;
	margin-bottom: 1rem;
}

.section-header__subtitle {
	font-size: 1.1rem;
	color: var(--text-muted-color);
	max-width: 600px;
	margin: 0 auto;
}

/* --- SECTION: CONCEPTS --- */
.concepts {
	background-color: var(--secondary-color);
}

.concepts__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 2rem;
}

.concepts__card {
	background-color: var(--bg-color);
	border: 1px solid var(--border-color);
	border-radius: 12px;
	padding: 2.5rem 2rem;
	text-align: center;
	transition: transform 0.3s ease, border-color 0.3s ease;
}

.concepts__card:hover {
	transform: translateY(-10px);
	border-color: var(--accent-color);
}

.concepts__card-icon {
	margin-bottom: 1.5rem;
}

.concepts__card-icon i {
	width: 48px;
	height: 48px;
	color: var(--accent-color);
}

.concepts__card-title {
	font-size: 1.4rem;
	margin-bottom: 1rem;
}

.concepts__card-description {
	color: var(--text-muted-color);
	line-height: 1.7;
}

/* Responsive Grid for Concepts */
@media (min-width: 576px) {
	.concepts__grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 992px) {
	.concepts__grid {
		grid-template-columns: repeat(4, 1fr);
	}
}

/* --- SECTION: TECHNOLOGIES IN ACTION (TECH) --- */

.tech__tabs {
	display: flex;
	justify-content: center;
	gap: 1rem;
	margin-bottom: 3rem;
	flex-wrap: wrap;
}

.tech__tab-button {
	padding: 0.75rem 1.5rem;
	background-color: var(--secondary-color);
	border: 1px solid var(--border-color);
	color: var(--text-muted-color);
	border-radius: 50px;
	cursor: pointer;
	font-family: var(--font-headings);
	font-weight: 500;
	transition: all 0.3s ease;
}

.tech__tab-button:hover {
	background-color: var(--border-color);
	color: var(--text-color);
}

.tech__tab-button--active {
	background-color: var(--accent-color);
	border-color: var(--accent-color);
	color: var(--bg-color);
}

.tech__content-pane {
	display: none; /* Hidden by default */
	grid-template-columns: 1fr;
	align-items: center;
	gap: 3rem;
	animation: fadeIn 0.5s ease-in-out;
}

.tech__content-pane--active {
	display: grid; /* Shown when active */
}

@keyframes fadeIn {
	from {
		opacity: 0;
		transform: translateY(10px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.tech__pane-image img {
	border-radius: 12px;
	border: 1px solid var(--border-color);
}

.tech__pane-text h3 {
	font-size: 1.8rem;
	margin-bottom: 1rem;
}

.tech__pane-text p {
	color: var(--text-muted-color);
	margin-bottom: 1.5rem;
}

.tech__pane-text ul {
	list-style: none;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.tech__pane-text li {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

.tech__pane-text li i {
	color: var(--accent-color);
	width: 22px;
	height: 22px;
}

@media (min-width: 992px) {
	.tech__content-pane {
		grid-template-columns: repeat(2, 1fr);
		text-align: left;
	}
}

/* --- SECTION: COURSES --- */
.courses {
	background-color: var(--secondary-color);
}

.courses__container {
	display: grid;
	grid-template-columns: 1fr;
	gap: 3rem;
	align-items: center;
}

.courses__image {
	border-radius: 12px;
	border: 1px solid var(--border-color);
}

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

.accordion__item {
	background-color: var(--bg-color);
	border: 1px solid var(--border-color);
	border-radius: 8px;
	overflow: hidden;
}

.accordion__header {
	width: 100%;
	background-color: transparent;
	border: none;
	padding: 1.5rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
	cursor: pointer;
	text-align: left;
}

.accordion__title {
	font-family: var(--font-headings);
	font-size: 1.2rem;
	color: var(--text-color);
	font-weight: 600;
}

.accordion__icon {
	color: var(--text-muted-color);
	transition: transform 0.4s ease;
}

.accordion__item--active .accordion__icon {
	transform: rotate(180deg);
	color: var(--accent-color);
}

.accordion__content {
	max-height: 0;
	overflow: hidden;
	transition: max-height 0.4s ease-out;
	padding: 0 1.5rem;
}

.accordion__content p {
	color: var(--text-muted-color);
	margin-bottom: 1.5rem;
}

.accordion__list {
	list-style-type: '✓ ';
	padding-left: 1.2rem;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	margin-bottom: 1.5rem;
}

.accordion__list li {
	padding-left: 0.5rem;
}

@media (min-width: 992px) {
	.courses__container {
		grid-template-columns: repeat(2, 1fr);
	}
}

/* --- SECTION: AUTHORS --- */
.authors__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 2rem;
	margin-top: 4rem;
}

.author-card {
	background-color: var(--secondary-color);
	border: 1px solid var(--border-color);
	border-radius: 12px;
	padding: 2rem;
	text-align: center;
	transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.author-card:hover {
	transform: translateY(-8px);
	box-shadow: 0 10px 20px rgba(0, 169, 255, 0.1);
}

.author-card__image-wrapper {
	width: 120px;
	height: 120px;
	margin: 0 auto 1.5rem;
}

.author-card__image {
	width: 100%;
	height: 100%;
	object-fit: cover;
	border-radius: 50%;
	border: 3px solid var(--accent-color);
}

.author-card__name {
	font-size: 1.4rem;
	margin-bottom: 0.5rem;
}

.author-card__role {
	color: var(--text-muted-color);
	margin-bottom: 1.5rem;
}

.author-card__socials {
	display: flex;
	justify-content: center;
	gap: 1.5rem;
}

.author-card__socials a {
	color: var(--text-muted-color);
}

.author-card__socials a:hover {
	color: var(--accent-color);
}

/* Responsive Grid for Authors */
@media (min-width: 576px) {
	.authors__grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 992px) {
	.authors__grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

/* --- SECTION: CONTACT --- */
.contact {
	padding-bottom: 6rem;
}

.contact__container {
	display: grid;
	grid-template-columns: 1fr;
	gap: 3rem;
	margin-top: 4rem;
}

.contact__info-title {
	font-size: 2rem;
	margin-bottom: 1rem;
}

.contact__info-text {
	color: var(--text-muted-color);
	margin-bottom: 2rem;
	line-height: 1.8;
}

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

.contact__info-item {
	display: flex;
	align-items: center;
	gap: 1rem;
	font-size: 1.1rem;
}

.contact__info-item i {
	color: var(--accent-color);
}

/* Form Styles */
.contact__form-wrapper {
	background-color: var(--secondary-color);
	padding: 2.5rem;
	border-radius: 12px;
	border: 1px solid var(--border-color);
}

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

.form-group__input {
	width: 100%;
	padding: 1rem;
	background-color: var(--bg-color);
	border: 1px solid var(--border-color);
	color: var(--text-color);
	border-radius: 6px;
	font-size: 1rem;
	transition: border-color 0.3s ease;
}

.form-group__input:focus {
	outline: none;
	border-color: var(--accent-color);
}

.form-group__label {
	position: absolute;
	top: 1rem;
	left: 1rem;
	color: var(--text-muted-color);
	pointer-events: none;
	transition: all 0.3s ease;
}

.form-group__input:focus + .form-group__label,
.form-group__input:not(:placeholder-shown) + .form-group__label {
	top: -0.75rem;
	left: 0.75rem;
	font-size: 0.8rem;
	background-color: var(--secondary-color);
	padding: 0 0.25rem;
	color: var(--accent-color);
}

.form-group--checkbox {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

.form-group--checkbox label {
	font-size: 0.9rem;
	color: var(--text-muted-color);
}

.form-group--checkbox a {
	color: var(--accent-color);
	text-decoration: underline;
}

.contact__form-button {
	width: 100%;
}

.form-success-message {
	display: none; /* Hidden by default */
	margin-top: 1.5rem;
	padding: 1rem;
	background-color: rgba(0, 169, 255, 0.1);
	border: 1px solid var(--accent-color);
	border-radius: 6px;
	color: var(--text-color);
	text-align: center;
	gap: 0.5rem;
	align-items: center;
	justify-content: center;
}

.form-success-message--visible {
	display: flex; /* Shown via JS */
}

@media (min-width: 992px) {
	.contact__container {
		grid-template-columns: 1fr 1.2fr;
	}
}

/* --- ETAP 5: ADDITIONAL ELEMENTS --- */

/* 1. Cookie Pop-up */
.cookie-popup {
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
	background-color: var(--secondary-color);
	border-top: 1px solid var(--border-color);
	padding: 1.5rem;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-wrap: wrap;
	gap: 1.5rem;
	z-index: 200;
	transform: translateY(150%);
	transition: transform 0.5s ease-in-out;
}

.cookie-popup--visible {
	transform: translateY(0);
}

.cookie-popup__text {
	color: var(--text-muted-color);
	text-align: center;
}

.cookie-popup__text a {
	color: var(--accent-color);
	text-decoration: underline;
}

.cookie-popup__button {
	padding: 0.6rem 1.5rem;
	flex-shrink: 0; /* Prevent button from shrinking on small screens */
}

@media (min-width: 768px) {
	.cookie-popup {
		justify-content: space-between;
		padding-left: 2rem;
		padding-right: 2rem;
	}
	.cookie-popup__text {
		text-align: left;
	}
}

/* 2. Policy Pages Styling */
.pages {
	padding: 120px 0 6rem; /* Add padding-top to account for fixed header */
}

.pages .container {
	max-width: 800px; /* Optimal width for reading */
}

.pages h1,
.pages h2 {
	margin-bottom: 1.5rem;
	line-height: 1.3;
}

.pages h1 {
	font-size: 1.5rem;
	border-bottom: 1px solid var(--border-color);
	padding-bottom: 1.5rem;
	margin-bottom: 2rem;
}

.pages h2 {
	font-size: 1.5rem;
	margin-top: 3rem;
}

.pages p {
	color: var(--text-muted-color);
	margin-bottom: 1.5rem;
	line-height: 1.8;
}

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

.pages li {
	margin-bottom: 0.75rem;
	color: var(--text-muted-color);
}

.pages a {
	color: var(--accent-color);
	text-decoration: underline;
}

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

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