/* Base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-normal),
              color var(--transition-normal);
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-normal);
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Section styling */
.section-padding {
  padding: var(--section-padding-y) 0;
}

.section-gray {
  background-color: var(--color-bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-7);
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

p {
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
}

.highlight {
  color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  font-size: var(--font-size-md);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-lg);
}

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

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

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

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

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

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

.btn-full {
  width: 100%;
}

/* Header styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-index-fixed);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

[data-theme="dark"] .header {
  background-color: rgba(28, 28, 30, 0.95);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo a {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-weight: var(--font-weight-medium);
  padding: var(--space-1) 0;
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 30px;
  position: relative;
  z-index: var(--z-index-dropdown);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  margin: 6px 0;
  transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.nav-cta {
  margin-left: var(--space-2);
}

/* Theme toggle */
.theme-toggle-wrapper {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-index-fixed);
}

.theme-toggle {
  background-color: var(--color-bg-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
  position: absolute;
  transition: all var(--transition-normal);
  font-size: var(--font-size-lg);
}

[data-theme="dark"] .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0);
}

[data-theme="light"] .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0);
}

[data-theme="light"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* Hero section */
.hero {
  padding-top: 140px;
  padding-bottom: var(--section-padding-y);
  position: relative;
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.hero-content {
  flex: 1;
}

.hero-content h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-2);
}

.hero-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.hero-content p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-5);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
}

.hero-image {
  flex: 1;
  position: relative;
  z-index: var(--z-index-base);
}

.hero-image-container {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.hero-shape {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 20px;
  left: 20px;
  border-radius: var(--radius-lg);
  background-color: var(--color-primary);
  z-index: var(--z-index-negative);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.mouse {
  width: 26px;
  height: 40px;
  border: 2px solid var(--color-text-secondary);
  border-radius: var(--radius-full);
  position: relative;
  display: flex;
  justify-content: center;
}

.wheel {
  width: 4px;
  height: 8px;
  background-color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  margin-top: var(--space-2);
}

.arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.arrow span {
  display: block;
  width: 10px;
  height: 10px;
  border-bottom: 2px solid var(--color-text-secondary);
  border-right: 2px solid var(--color-text-secondary);
  transform: rotate(45deg);
}

/* About section */
.about-content {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.about-image {
  flex: 1;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.about-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.about-shape {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 15px;
  left: -15px;
  border-radius: var(--radius-lg);
  background-color: var(--color-accent);
  z-index: var(--z-index-negative);
}

.about-text {
  flex: 1;
}

.about-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.info-item {
  display: flex;
  flex-direction: column;
}

.info-title {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

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

.info-value.available {
  color: var(--color-success);
  font-weight: var(--font-weight-medium);
}

.about-cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.social-links {
  display: flex;
  gap: var(--space-2);
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

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

/* Skills section */
.skills-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.skills-categories {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.skill-category {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.skill-category:hover,
.skill-category.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.skills-list-container {
  position: relative;
  min-height: 300px;
}

.skills-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
  position: absolute;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.skills-list.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.skill-info h3 {
  font-size: var(--font-size-md);
  margin-bottom: 0;
}

.skill-percentage {
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
}

.skill-bar {
  height: 8px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  width: 0;
  --percentage: 0%;
}

/* Projects section */
.project-filters {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.project-filter {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.project-filter:hover,
.project-filter.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-5);
}

.project-card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.project-image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition-normal);
}

.project-links {
  display: flex;
  gap: var(--space-3);
}

.project-link {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background-color: var(--color-white);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

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

.project-info {
  padding: var(--space-4);
}

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

.project-description {
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.project-tag {
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

/* Contact section */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-8);
}

.contact-info-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: var(--font-size-xl);
}

.contact-text h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

.contact-availability {
  padding: var(--space-4);
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.availability-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.status-indicator {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.status-indicator.available {
  background-color: var(--color-success);
  box-shadow: 0 0 0 2px rgba(52, 199, 89, 0.3);
}

.status-text {
  font-weight: var(--font-weight-medium);
  color: var(--color-success);
}

.contact-form-container {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-group label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.contact-form input,
.contact-form textarea {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-family);
  transition: all var(--transition-normal);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.error-message {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  height: 20px;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-3);
  background-color: var(--color-success-light);
  color: var(--color-success-dark);
  border-radius: var(--radius-md);
  margin-top: var(--space-3);
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.form-success i {
  color: var(--color-success);
  font-size: var(--font-size-xl);
}

.form-success.show {
  display: flex;
}

/* Footer */
.footer {
  background-color: var(--color-bg-secondary);
  padding: var(--space-8) 0 var(--space-4);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.footer-logo a {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  display: inline-block;
}

.footer-logo p {
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--space-8);
}

.footer-links-column h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

.footer-links-column ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links-column a {
  color: var(--color-text-secondary);
  transition: color var(--transition-normal);
}

.footer-links-column a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  margin-bottom: 0;
  font-size: var(--font-size-sm);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-4);
  left: var(--space-4);
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: var(--z-index-fixed);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}