/* Modern Portfolio CSS with Theme System */

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

/* ===== THEME VARIABLES ===== */
:root {
  /* Light theme colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;

  /* Layout */
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --border: #475569;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
}

/* ===== BASE STYLES ===== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

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

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

/* ===== LAYOUT COMPONENTS ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
}

.section {
  padding: 6rem 0 5rem;
  scroll-margin-top: 0.5rem;
  contain: layout style;
}

@media (max-width: 768px) {
  .section {
    padding: 4rem 0 3rem;
    scroll-margin-top: 0.75rem;
  }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
  display: none !important;
}

.scroll-disabled {
  overflow: hidden;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

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

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 2px solid var(--border);
}

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

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent);
}

/* ===== HEADER & NAVIGATION ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

[data-theme="dark"] header {
  background: rgba(15, 23, 42, 0.8);
}

nav {
  padding: 1rem 0;
}

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

.nav-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  transition: var(--transition);
}

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

.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

@media (min-width: 769px) {
  .nav-menu a.active::after {
    bottom: -0.5rem;
    left: 0;
    right: 0;
    width: auto;
    transform: none;
  }
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 0.5rem;
}

.theme-btn {
  padding: 0.5rem;
  border: none;
  background: transparent;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.theme-btn.active {
  background: var(--accent);
  color: white;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 44px;
  height: 44px;
  position: relative;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: absolute;
}

.hamburger-line:nth-child(1) {
  transform: translateY(-6px);
}

.hamburger-line:nth-child(2) {
  transform: translateY(0);
}

.hamburger-line:nth-child(3) {
  transform: translateY(6px);
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-top: none;
    flex-direction: column;
    gap: 0;
    padding: 2rem;
    transform: translateX(100%);
    transition: var(--transition);
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-menu li a {
    display: block;
    width: 100%;
    padding: 1.25rem 0;
    text-align: center;
  }

  .theme-toggle {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(0) rotate(45deg);
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: translateY(0) scaleX(0);
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(0) rotate(-45deg);
  }
}

/* ===== HERO SECTION ===== */
#hero {
  padding: 8rem 0 5rem;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

@media (max-width: 768px) {
  #hero {
    padding: 6rem 0 3rem;
    min-height: auto;
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
}

.hero-content h1 {
  margin-bottom: 1rem;
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--accent-hover) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.typing-container {
  min-height: 3rem;
  margin-bottom: 1.25rem;
}

.typing-text {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}

.cursor {
  color: var(--accent);
  animation: blink 1s infinite;
  will-change: opacity;
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

@media (max-width: 768px) {
  .hero-actions {
    justify-content: center;
    margin-bottom: 2rem;
  }
}

.hero-image {
  position: relative;
}

.hero-image::before {
  content: "";
  position: absolute;
  top: -1.5rem;
  left: 7.5%;
  right: 7.5%;
  bottom: 2.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: var(--border-radius-lg);
  z-index: -1;
  opacity: 0.1;
}

.hero-image img {
  width: 85%;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  margin: 1rem 0 0 auto;
  display: block;
}

.hero-attribution {
  position: absolute;
  bottom: -1.5rem;
  right: 0;
  font-size: 0.625rem;
  opacity: 0.6;
}

.hero-attribution a {
  color: var(--text-tertiary);
  font-weight: 300;
  text-decoration: none;
}

/* ===== PROJECTS SECTION ===== */
#projects {
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

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

.project-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--border);
}

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

.project-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

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

.project-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    var(--bg-tertiary) 0%,
    var(--bg-secondary) 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-weight: 600;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  transition: var(--transition);
}

.project-card:hover .project-overlay {
  opacity: 0.9;
}

.project-card:hover .project-image img {
  transform: scale(1.1);
}

.overlay-btn {
  background: white;
  color: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.overlay-btn:hover {
  transform: scale(1.05);
  color: var(--accent);
}

.project-content {
  padding: 1.5rem;
}

.project-content h3 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.project-content p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tech-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border);
}

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

.project-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--accent-hover);
  transform: translateX(4px);
}

/* ===== ABOUT SECTION ===== */
#about {
  background: var(--bg-primary);
}

.about-container {
  display: block;
}

@media (max-width: 768px) {
  .about-container {
    display: block;
  }
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.about-content h2 {
  margin-bottom: 2rem;
}

.about-text p {
  margin-bottom: 1.5rem;
}

.about-highlight {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  border-left: 4px solid var(--accent);
  margin: 2rem 0;
}

.about-highlight h3 {
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-item {
  text-align: center;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* ===== SKILLS SECTION ===== */
#skills {
  background: var(--bg-secondary);
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

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

.skill-category {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.skill-category h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
  color: var(--accent);
}

.skill-category i {
  font-size: 1.5rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-item {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.skill-item:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
  border-color: var(--accent);
}

/* ===== CONTACT SECTION ===== */
#contact {
  background: var(--bg-primary);
}

.contact-container {
  max-width: 1200px;
  margin: 0 auto;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-left h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.contact-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.contact-details {
  margin-bottom: 2rem;
}

.contact-method {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-method i {
  font-size: 1.5rem;
  color: var(--accent);
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.contact-method h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.contact-method p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

.contact-form-container {
  background: var(--bg-secondary);
  padding: 2.5rem;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border);
}

@media (max-width: 768px) {
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .contact-method {
    justify-content: center;
  }
}

.social-links {
  display: flex;
  justify-content: flex-start;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .social-links {
    justify-content: center;
  }
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-4px);
  border-color: var(--accent);
}

/* ===== FOOTER ===== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
}

footer p {
  margin: 0;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* ===== MODAL STYLES ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 9999;
  padding: 2rem;
  overflow-y: auto;
}

.modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  max-width: 600px;
  margin: 2rem auto;
  box-shadow: var(--shadow-xl);
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-2rem) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 2rem 0;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.5rem;
}

.modal-close {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--accent);
  color: white;
}

.modal-body {
  padding: 2rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-message {
  display: none;
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  font-weight: 500;
}

.form-message.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeInUp 0.6s ease-out;
}

/* ===== RESPONSIVE UTILITIES ===== */
@media (max-width: 768px) {
  .modal {
    padding: 1rem;
  }

  .modal-header,
  .modal-body {
    padding: 1.5rem;
  }

  .form-actions {
    flex-direction: column-reverse;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .skills-container {
    gap: 1.5rem;
  }

  .contact-methods {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1400px) {
  .container {
    max-width: 1200px;
  }
}