/* =============== VARIABLES =============== */
:root {
  /* Colors */
  --primary-color: #0F172A;
  --accent-blue: #0EA5E9;
  --accent-green: #10B981;
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-h1: clamp(2.5rem, 5vw, 4rem);
  --font-size-h2: clamp(2rem, 4vw, 3rem);
  --font-size-h3: clamp(1.5rem, 3vw, 2rem);
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Layout */
  --container-max-width: 1200px;
  --section-padding: 5rem 0;
  --header-height: 80px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--white);
}

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

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

ul {
  list-style: none;
}

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

/* =============== REUSABLE CLASSES =============== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--section-padding);
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section__title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.section__subtitle {
  font-size: var(--font-size-body);
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto;
}

/* =============== HEADER =============== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: var(--transition-normal);
}

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

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
}

.nav__title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav__link {
  font-weight: var(--font-weight-medium);
  color: var(--gray-600);
  transition: var(--transition-fast);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.nav__link:hover,
.nav__link.active {
  color: var(--accent-blue);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-blue);
  transition: var(--transition-normal);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__toggle,
.nav__close {
  display: none;
}

/* =============== HERO SECTION =============== */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--gray-800) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('https://images.pexels.com/photos/3862132/pexels-photo-3862132.jpeg?auto=compress&cs=tinysrgb&w=1200') center/cover;
  opacity: 0.1;
  z-index: 1;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero__content {
  animation: fadeInUp 1s ease 0.2s both;
}

.hero__title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.hero__tagline {
  font-size: 1.5rem;
  font-weight: var(--font-weight-medium);
  color: var(--accent-blue);
  margin-bottom: var(--spacing-lg);
  letter-spacing: 0.05em;
}

.hero__description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--gray-200);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.hero__cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.hero__image {
  animation: fadeInRight 1s ease 0.4s both;
}

.hero__img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.hero__scroll {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  animation: fadeIn 1s ease 1s both;
}

.hero__scroll-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--gray-300);
  transition: var(--transition-normal);
}

.hero__scroll-link:hover {
  color: var(--accent-blue);
}

.hero__scroll-text {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

.hero__scroll-arrow {
  animation: bounce 2s infinite;
}

/* =============== ABOUT SECTION =============== */
.about {
  background-color: var(--gray-50);
}

.about__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about__text {
  margin-bottom: var(--spacing-lg);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--gray-600);
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.stat {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat__number {
  display: block;
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--accent-blue);
  margin-bottom: var(--spacing-xs);
}

.stat__label {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--gray-600);
}

.about__img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

/* =============== HIGHLIGHTS SECTION =============== */
.highlights__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.highlight__card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.highlight__card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-blue);
}

.card__icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-lg);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  color: var(--white);
  border-radius: var(--radius-lg);
}

.card__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.card__description {
  color: var(--gray-600);
  line-height: 1.7;
}

/* =============== TIMELINE SECTION =============== */
.timeline {
  background-color: var(--gray-50);
}

.timeline__container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline__container::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-green));
  transform: translateX(-50%);
}

.timeline__item {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.timeline__item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline__item:nth-child(even) .timeline__content {
  text-align: right;
}

.timeline__marker {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.timeline__number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: 1.25rem;
  box-shadow: var(--shadow-lg);
}

.timeline__content {
  flex: 1;
  max-width: 350px;
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.timeline__content:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.timeline__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.timeline__description {
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.timeline__date {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* =============== GALLERY SECTION =============== */
.gallery__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.gallery__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.gallery__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.gallery__img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: var(--transition-slow);
}

.gallery__item:hover .gallery__img {
  transform: scale(1.1);
}

.gallery__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.9), transparent);
  color: var(--white);
  padding: var(--spacing-lg);
  transform: translateY(100%);
  transition: var(--transition-normal);
}

.gallery__item:hover .gallery__overlay {
  transform: translateY(0);
}

.gallery__title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
}

/* =============== CONTACT SECTION =============== */
.contact {
  background-color: var(--gray-50);
}

.contact__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact__info-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
}

.contact__info-text {
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact__detail {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--gray-600);
}

.contact__icon {
  width: 24px;
  height: 24px;
  color: var(--accent-blue);
}

.contact__form {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.form__group {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.form__input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  transition: var(--transition-normal);
  background: var(--white);
}

.form__input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form__input:focus + .form__label,
.form__input:not(:placeholder-shown) + .form__label {
  transform: translateY(-1.5rem) scale(0.85);
  color: var(--accent-blue);
}

.form__label {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  color: var(--gray-500);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-normal);
  pointer-events: none;
  transform-origin: left top;
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__submit {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.form__submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.form__submit:active {
  transform: translateY(0);
}

/* =============== FOOTER =============== */
.footer {
  background-color: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-700);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
}

.footer__title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
}

.footer__links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer__link {
  color: var(--gray-300);
  transition: var(--transition-fast);
}

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

.footer__copyright {
  text-align: center;
  color: var(--gray-400);
  font-size: var(--font-size-small);
}

/* =============== ANIMATIONS =============== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============== RESPONSIVE DESIGN =============== */
@media screen and (max-width: 1024px) {
  :root {
    --section-padding: 4rem 0;
  }
  
  .hero__container {
    gap: var(--spacing-xl);
  }
  
  .about__container {
    gap: var(--spacing-xl);
  }
  
  .contact__container {
    gap: var(--spacing-xl);
  }
  
  .timeline__container::before {
    left: 30px;
  }
  
  .timeline__item {
    flex-direction: row !important;
    padding-left: 80px;
  }
  
  .timeline__item:nth-child(even) .timeline__content {
    text-align: left;
  }
  
  .timeline__marker {
    left: 30px;
    transform: translateX(-50%);
  }
  
  .timeline__content {
    max-width: none;
  }
}

@media screen and (max-width: 768px) {
  :root {
    --header-height: 60px;
    --section-padding: 3rem 0;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  /* Mobile Navigation */
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--white);
    padding: var(--spacing-3xl) var(--spacing-lg);
    transition: var(--transition-normal);
    z-index: 1000;
  }
  
  .nav__menu.show-menu {
    right: 0;
  }
  
  .nav__list {
    flex-direction: column;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .nav__link {
    font-size: 1.125rem;
  }
  
  .nav__close,
  .nav__toggle {
    display: block;
  }
  
  .nav__close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
  }
  
  .nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
  }
  
  .nav__toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: var(--transition-normal);
  }
  
  .nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(7px);
  }
  
  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-7px);
  }
  
  /* Mobile Sections */
  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .hero__content {
    order: 2;
  }
  
  .hero__image {
    order: 1;
  }
  
  .about__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .about__image {
    order: -1;
  }
  
  .about__stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .highlights__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .contact__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer__content {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
  
  .footer__links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }
}

@media screen and (max-width: 480px) {
  :root {
    --section-padding: 2.5rem 0;
  }
  
  .hero__scroll {
    display: none;
  }
  
  .gallery__container {
    grid-template-columns: 1fr;
  }
  
  .timeline__item {
    padding-left: 60px;
  }
  
  .timeline__container::before {
    left: 20px;
  }
  
  .timeline__marker {
    left: 20px;
  }
  
  .timeline__number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* =============== UTILITY CLASSES =============== */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* =============== LOADING STATES =============== */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-300);
  border-top: 2px solid var(--accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  transform: translate(-50%, -50%);
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* =============== FOCUS STYLES =============== */
*:focus {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

button:focus,
.hero__cta:focus,
.form__submit:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.3);
}