/* =============== VARIABLES CSS =============== */
:root {
  --header-height: 3.5rem;
  
  /* Colors */
  --primary-color: #0052FF;
  --primary-color-alt: #0041CC;
  --secondary-color: #00E6B8;
  --accent-color: #FF6B6B;
  --gradient-color: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  --text-color: #2C3E50;
  --text-color-light: #7F8C8D;
  --body-color: #FFFFFF;
  --container-color: #F8F9FA;
  --white-color: #FFFFFF;
  --shadow-color: rgba(0, 82, 255, 0.1);
  --border-color: #E9ECEF;
  
  /* Typography */
  --body-font: 'Inter', sans-serif;
  --title-font: 'Poppins', sans-serif;
  --biggest-font-size: 3.5rem;
  --h1-font-size: 2.25rem;
  --h2-font-size: 1.75rem;
  --h3-font-size: 1.25rem;
  --normal-font-size: 1rem;
  --small-font-size: 0.875rem;
  --smaller-font-size: 0.813rem;
  
  /* Font Weight */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semi-bold: 600;
  --font-bold: 700;
  
  /* z-index */
  --z-tooltip: 10;
  --z-fixed: 100;
  --z-modal: 1000;
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease;
  
  /* Border Radius */
  --border-radius: 12px;
  --border-radius-small: 8px;
  --border-radius-large: 20px;
  
  /* Spacing */
  --mb-0-25: 0.25rem;
  --mb-0-5: 0.5rem;
  --mb-0-75: 0.75rem;
  --mb-1: 1rem;
  --mb-1-25: 1.25rem;
  --mb-1-5: 1.5rem;
  --mb-2: 2rem;
  --mb-2-5: 2.5rem;
  --mb-3: 3rem;
}

/* Responsive Typography */
@media screen and (max-width: 992px) {
  :root {
    --biggest-font-size: 2.75rem;
    --h1-font-size: 1.75rem;
    --h2-font-size: 1.5rem;
    --h3-font-size: 1.125rem;
    --normal-font-size: 0.938rem;
    --small-font-size: 0.813rem;
    --smaller-font-size: 0.75rem;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--body-font);
  font-size: var(--normal-font-size);
  background-color: var(--body-color);
  color: var(--text-color);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  color: var(--text-color);
  font-weight: var(--font-semi-bold);
  font-family: var(--title-font);
  line-height: 1.2;
}

ul {
  list-style: none;
}

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

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

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: var(--body-font);
}

/* =============== REUSABLE CSS CLASSES =============== */
.container {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.section {
  padding: 5rem 0 3rem;
}

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

.section__title {
  font-size: var(--h1-font-size);
  color: var(--text-color);
  margin-bottom: var(--mb-0-75);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-color);
  border-radius: 2px;
}

.section__subtitle {
  font-size: var(--normal-font-size);
  color: var(--text-color-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.5;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gradient-color);
  color: var(--white-color);
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  font-weight: var(--font-medium);
  font-size: var(--normal-font-size);
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
}

.button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition);
}

.button:hover::before {
  left: 100%;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 82, 255, 0.3);
}

.button--outline {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.button--outline:hover {
  background: var(--primary-color);
  color: var(--white-color);
}

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

.header.scroll-header {
  box-shadow: 0 2px 20px var(--shadow-color);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: var(--font-bold);
  color: var(--text-color);
}

.nav__logo img {
  width: 40px;
  height: 40px;
}

.nav__logo-text {
  font-size: var(--h3-font-size);
  font-family: var(--title-font);
  background: var(--gradient-color);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__list {
  display: flex;
  gap: 2rem;
}

.nav__link {
  color: var(--text-color);
  font-weight: var(--font-medium);
  transition: var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-color);
  transition: var(--transition);
}

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

.nav__toggle,
.nav__close {
  display: none;
  font-size: 1.25rem;
  color: var(--text-color);
  cursor: pointer;
}

/* =============== HERO =============== */
.hero {
  background: var(--body-color);
  padding-top: calc(var(--header-height) + 2rem);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.05) 0%, rgba(0, 230, 184, 0.05) 100%);
  z-index: -1;
}

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

.hero__data {
  animation: fadeInLeft 1s ease-out;
}

.hero__title {
  font-size: var(--biggest-font-size);
  font-weight: var(--font-bold);
  margin-bottom: var(--mb-1);
  line-height: 1.1;
  display: flex;
  flex-direction: column;
}

.hero__title-highlight {
  background: var(--gradient-color);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: var(--biggest-font-size);
}

.hero__subtitle {
  font-size: var(--h2-font-size);
  color: var(--text-color-light);
  font-weight: var(--font-regular);
  margin-top: var(--mb-0-5);
}

.hero__description {
  font-size: var(--normal-font-size);
  color: var(--text-color-light);
  margin-bottom: var(--mb-2);
  line-height: 1.6;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 1s ease-out;
}

.hero__geometric {
  position: relative;
  width: 400px;
  height: 400px;
}

.geometric-shape {
  position: absolute;
  border-radius: var(--border-radius);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 100px;
  height: 100px;
  background: var(--gradient-color);
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  top: 10%;
  right: 20%;
  animation-delay: 1s;
}

.shape-3 {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  bottom: 30%;
  left: 20%;
  animation-delay: 2s;
}

.shape-4 {
  width: 120px;
  height: 120px;
  background: rgba(0, 82, 255, 0.1);
  border: 2px solid var(--primary-color);
  bottom: 10%;
  right: 10%;
  animation-delay: 3s;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--white-color);
  box-shadow: 0 4px 20px var(--shadow-color);
  color: var(--primary-color);
  font-size: 1.25rem;
  transition: var(--transition);
  animation: bounce 2s infinite;
}

.hero__scroll-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--shadow-color);
}

/* =============== SERVICES =============== */
.services {
  background: var(--container-color);
}

.services__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: var(--mb-3);
}

.service__card {
  background: var(--white-color);
  padding: 2rem;
  border-radius: var(--border-radius-large);
  box-shadow: 0 4px 20px var(--shadow-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.service__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-color);
}

.service__card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 82, 255, 0.15);
}

.service__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.1), rgba(0, 230, 184, 0.1));
  border-radius: var(--border-radius);
  margin-bottom: var(--mb-1-5);
  font-size: 2rem;
  color: var(--primary-color);
}

.service__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-1);
  color: var(--text-color);
}

.service__description {
  color: var(--text-color-light);
  margin-bottom: var(--mb-1-5);
  line-height: 1.6;
}

.service__features {
  margin-bottom: var(--mb-2);
}

.service__features li {
  color: var(--text-color-light);
  margin-bottom: var(--mb-0-5);
  position: relative;
  padding-left: 1.5rem;
}

.service__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--secondary-color);
  font-weight: var(--font-bold);
}

.service__button {
  color: var(--primary-color);
  font-weight: var(--font-medium);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.service__button:hover {
  color: var(--primary-color-alt);
  transform: translateX(5px);
}

/* =============== PROJECTS =============== */
.projects__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: var(--mb-3);
}

.project__card {
  background: var(--white-color);
  border-radius: var(--border-radius-large);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow-color);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.project__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 82, 255, 0.15);
}

.project__image {
  position: relative;
  overflow: hidden;
  height: 250px;
}

.project__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 82, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.project__card:hover .project__overlay {
  opacity: 1;
}

.project__card:hover .project__image img {
  transform: scale(1.1);
}

.project__link {
  color: var(--white-color);
  font-weight: var(--font-medium);
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.project__link:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.project__content {
  padding: 1.5rem;
}

.project__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-75);
  color: var(--text-color);
}

.project__description {
  color: var(--text-color-light);
  margin-bottom: var(--mb-1);
  line-height: 1.5;
}

.project__tech {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tech-tag {
  background: var(--container-color);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: var(--small-font-size);
  font-weight: var(--font-medium);
  border: 1px solid rgba(0, 82, 255, 0.2);
}

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

.about__container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

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

.feature {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.feature__icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--gradient-color);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white-color);
  font-size: 1.5rem;
}

.feature__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-5);
  color: var(--text-color);
}

.feature__description {
  color: var(--text-color-light);
  line-height: 1.6;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: var(--mb-3);
  text-align: center;
}

.stat {
  background: var(--container-color);
  padding: 2rem 1rem;
  border-radius: var(--border-radius-large);
  transition: var(--transition);
}

.stat:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--shadow-color);
}

.stat__number {
  font-size: 3rem;
  font-weight: var(--font-bold);
  background: var(--gradient-color);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--mb-0-5);
}

.stat__label {
  color: var(--text-color-light);
  font-weight: var(--font-medium);
}

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

.contact__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: var(--mb-3);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--white-color);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px var(--shadow-color);
  transition: var(--transition);
}

.contact__item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--shadow-color);
}

.contact__icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--gradient-color);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white-color);
  font-size: 1.5rem;
}

.contact__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-0-25);
  color: var(--text-color);
}

.contact__description {
  color: var(--text-color-light);
  font-weight: var(--font-medium);
}

.contact__form {
  background: var(--white-color);
  padding: 2rem;
  border-radius: var(--border-radius-large);
  box-shadow: 0 4px 20px var(--shadow-color);
}

.form__group {
  margin-bottom: var(--mb-1-5);
}

.form__input {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--normal-font-size);
  font-family: var(--body-font);
  color: var(--text-color);
  transition: var(--transition);
  background: var(--white-color);
}

.form__input:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.1);
}

.form__input::placeholder {
  color: var(--text-color-light);
}

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

.form__button {
  width: 100%;
  justify-content: center;
}

/* =============== FOOTER =============== */
.footer {
  background: var(--text-color);
  color: var(--white-color);
  padding: 3rem 0 1rem;
}

.footer__container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: var(--mb-2);
}

.footer__content {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: var(--mb-1);
  font-weight: var(--font-bold);
  font-size: var(--h3-font-size);
}

.footer__logo img {
  width: 40px;
  height: 40px;
  filter: brightness(0) invert(1);
}

.footer__description {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

.footer__title {
  font-size: var(--h3-font-size);
  margin-bottom: var(--mb-1);
  color: var(--white-color);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__link {
  color: rgba(255, 255, 255, 0.8);
  transition: var(--transition);
}

.footer__link:hover {
  color: var(--secondary-color);
  transform: translateX(5px);
}

.footer__social-links {
  display: flex;
  gap: 1rem;
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  color: var(--white-color);
  font-size: 1.25rem;
  transition: var(--transition);
}

.footer__social-link:hover {
  background: var(--secondary-color);
  transform: translateY(-3px);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--mb-1);
  text-align: center;
}

.footer__copyright {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--small-font-size);
}

/* =============== ANIMATIONS =============== */
@keyframes fadeInLeft {
  0% {
    opacity: 0;
    transform: translateX(-50px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  0% {
    opacity: 0;
    transform: translateX(50px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

/* =============== RESPONSIVE DESIGN =============== */
/* Large devices */
@media screen and (max-width: 992px) {
  .container {
    margin-left: var(--mb-1-5);
    margin-right: var(--mb-1-5);
  }
  
  .hero__container {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  
  .hero__geometric {
    width: 300px;
    height: 300px;
  }
  
  .contact__container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer__container {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

/* Medium devices */
@media screen and (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background: var(--white-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: var(--z-modal);
  }
  
  .nav__menu.show-menu {
    right: 0;
  }
  
  .nav__list {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }
  
  .nav__link {
    font-size: var(--h3-font-size);
  }
  
  .nav__close,
  .nav__toggle {
    display: block;
  }
  
  .nav__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
  }
  
  .hero {
    padding-top: calc(var(--header-height) + 1rem);
  }
  
  .hero__buttons {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
  
  .hero__geometric {
    width: 250px;
    height: 250px;
  }
  
  .services__container {
    grid-template-columns: 1fr;
  }
  
  .projects__container {
    grid-template-columns: 1fr;
  }
  
  .about__features {
    grid-template-columns: 1fr;
  }
  
  .about__stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer__container {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* Small devices */
@media screen and (max-width: 576px) {
  .container {
    margin-left: var(--mb-1);
    margin-right: var(--mb-1);
  }
  
  .section {
    padding: 3rem 0 2rem;
  }
  
  .hero__geometric {
    width: 200px;
    height: 200px;
  }
  
  .shape-1 {
    width: 60px;
    height: 60px;
  }
  
  .shape-2 {
    width: 50px;
    height: 50px;
  }
  
  .shape-3 {
    width: 40px;
    height: 40px;
  }
  
  .shape-4 {
    width: 80px;
    height: 80px;
  }
  
  .service__card {
    padding: 1.5rem;
  }
  
  .contact__form {
    padding: 1.5rem;
  }
  
  .about__stats {
    grid-template-columns: 1fr;
  }
  
  .stat__number {
    font-size: 2.5rem;
  }
}

/* Extra small devices */
@media screen and (max-width: 350px) {
  .container {
    margin-left: var(--mb-0-75);
    margin-right: var(--mb-0-75);
  }
  
  .nav__logo-text {
    font-size: var(--normal-font-size);
  }
  
  .hero__buttons {
    width: 100%;
  }
  
  .button {
    width: 100%;
    justify-content: center;
  }
}