/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  --color-secondary: #f59e0b;
  --color-accent: #10b981;
  
  /* Text Colors */
  --color-text-primary: #111827;
  --color-text-secondary: #6b7280;
  --color-text-light: #9ca3af;
  
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-bg-dark: #1f2937;
  
  /* Border Colors */
  --color-border-light: #e5e7eb;
  --color-border-medium: #d1d5db;
  --color-border-dark: #9ca3af;
  
  /* 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);
  
  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Breakpoints */
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
  --bp-2xl: 1536px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.25s ease-out;
  --transition-slow: 0.5s ease-out;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 4rem;
}

/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* ===== UTILITY CLASSES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-4);
  }
}

.section {
  padding: var(--space-24) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-16) 0;
  }
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (max-width: 768px) {
  .section__title {
    font-size: var(--text-3xl);
  }
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-medium);
}

.btn--outline:hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

@media (max-width: 768px) {
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
  }
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: all var(--transition-base);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav__logo-text {
  color: var(--color-text-primary);
}

.nav__logo-accent {
  color: var(--color-primary);
}

.nav__menu {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__link {
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

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

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

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

.nav__toggle,
.nav__close {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav__container {
    padding: 0 var(--space-4);
  }
  
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: white;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-20) var(--space-6);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-base);
  }
  
  .nav__menu.show-menu {
    right: 0;
  }
  
  .nav__list {
    flex-direction: column;
    gap: var(--space-6);
    width: 100%;
  }
  
  .nav__link {
    font-size: var(--text-lg);
  }
  
  .nav__toggle,
  .nav__close {
    display: block;
  }
  
  .nav__close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
  }
}

/* ===== HERO SECTION ===== */
.hero {
  padding-top: calc(var(--header-height) + var(--space-12));
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e5e7eb" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
  z-index: -1;
}

.hero__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero__title {
  font-size: var(--text-6xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.hero__title-line {
  display: block;
}

.hero__title-accent {
  color: var(--color-primary);
}

.hero__description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  max-width: 500px;
}

.hero__buttons {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Code Block */
.code-block {
  background: var(--color-bg-dark);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  font-family: var(--font-mono);
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: #374151;
  border-bottom: 1px solid #4b5563;
}

.code-block__dots {
  display: flex;
  gap: var(--space-2);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot--red { background: #ef4444; }
.dot--yellow { background: #f59e0b; }
.dot--green { background: #10b981; }

.code-block__title {
  color: #d1d5db;
  font-size: var(--text-sm);
}

.code-block__content {
  padding: var(--space-6);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: #e5e7eb;
  overflow-x: auto;
}

.code-keyword { color: #8b5cf6; }
.code-class { color: #f59e0b; }
.code-property { color: #10b981; }
.code-string { color: #06b6d4; }
.code-function { color: #3b82f6; }

/* Mobile Hero */
@media (max-width: 1024px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  
  .hero__title {
    font-size: var(--text-5xl);
  }
  
  .hero__description {
    margin: 0 auto var(--space-8);
  }
}

@media (max-width: 768px) {
  .hero {
    padding-top: calc(var(--header-height) + var(--space-8));
  }
  
  .hero__container {
    padding: 0 var(--space-4);
  }
  
  .hero__title {
    font-size: var(--text-4xl);
  }
  
  .hero__buttons {
    justify-content: center;
  }
  
  .code-block__content {
    font-size: var(--text-xs);
    padding: var(--space-4);
  }
}

/* ===== ABOUT SECTION ===== */
.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.about__description {
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.stat {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}

.stat__number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.about__skills-title {
  margin-bottom: var(--space-6);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: white;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.skill-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.skill-item__icon {
  font-size: var(--text-xl);
}

.skill-item__name {
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Mobile About */
@media (max-width: 1024px) {
  .about__content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

@media (max-width: 768px) {
  .about__stats {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

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

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.service-card {
  background: white;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.service-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.service-card__description {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== PROJECTS SECTION ===== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.project-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-card__image {
  height: 200px;
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--color-border-light);
}

.project-card__placeholder {
  color: var(--color-text-light);
}

.project-card__content {
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.project-card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.tech-tag {
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-secondary);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border-light);
}

.project-card__links {
  display: flex;
  gap: var(--space-4);
}

.project-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--color-primary);
  color: white;
}

.projects__cta {
  text-align: center;
}

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

.contact__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

.contact__info-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.contact__info-description {
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

.contact__methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact__method {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  text-decoration: none;
}

.contact__method:hover {
  border-color: var(--color-primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.contact__method-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact__method-content {
  display: flex;
  flex-direction: column;
}

.contact__method-label {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  font-weight: 500;
}

.contact__method-value {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Form Styles */
.contact__form {
  background: white;
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-lg);
}

.form__group {
  margin-bottom: var(--space-6);
}

.form__label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 500;
  color: var(--color-text-primary);
}

.form__input,
.form__textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: inherit;
  transition: all var(--transition-fast);
  background: var(--color-bg-primary);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

/* Mobile Contact */
@media (max-width: 1024px) {
  .contact__content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-bg-dark);
  color: white;
  padding: var(--space-16) 0 var(--space-8);
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-16);
  margin-bottom: var(--space-12);
}

.footer__logo {
  display: flex;
  align-items: center;
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  text-decoration: none;
}

.footer__logo-text {
  color: white;
}

.footer__logo-accent {
  color: var(--color-primary);
}

.footer__description {
  color: #9ca3af;
  max-width: 400px;
}

.footer__links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.footer__group-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  color: #9ca3af;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid #374151;
  text-align: center;
}

.footer__copyright {
  color: #6b7280;
  margin: 0;
}

/* Mobile Footer */
@media (max-width: 768px) {
  .footer__content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
  }
  
  .footer__links {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

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

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

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

/* Scroll animations will be handled by JavaScript */
.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.fade-in-left {
  animation: fadeInLeft 0.6s ease-out forwards;
}

.fade-in-right {
  animation: fadeInRight 0.6s ease-out forwards;
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Screen reader only class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== LOADING STATES ===== */
.loading {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-medium);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}