/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
  /* Colors - Light Mode */
  --bg-primary: #fafaf9;
  --bg-secondary: #ffffff;
  --bg-accent: #f5f5f4;
  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-tertiary: #78716c;
  --accent-primary: #dc2626;
  --accent-secondary: #7c2d12;
  --border-color: #e7e5e4;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-display: "Crimson Pro", Georgia, serif;
  --font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --section-padding: 5rem 0;
  --container-padding: 0 1.5rem;
  --max-width: 1200px;

  /* Transitions */
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
body.dark-mode {
  --bg-primary: #0c0a09;
  --bg-secondary: #1c1917;
  --bg-accent: #292524;
  --text-primary: #fafaf9;
  --text-secondary: #d6d3d1;
  --text-tertiary: #a8a29e;
  --accent-primary: #ef4444;
  --accent-secondary: #fca5a5;
  --border-color: #44403c;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
  overflow-x: hidden;
}

/* ===================================
   Navigation
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-base);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: var(--transition-base);
}

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

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: var(--transition-base);
  padding: 0.25rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-primary);
  transition: width 0.3s ease;
}

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

.nav-link:hover::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
  transition: var(--transition-base);
  position: absolute;
}

.sun-icon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.moon-icon {
  opacity: 0;
  transform: scale(0.5) rotate(180deg);
}

body.dark-mode .sun-icon {
  opacity: 0;
  transform: scale(0.5) rotate(-180deg);
}

body.dark-mode .moon-icon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger-line {
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-base);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    var(--accent-primary) 0%,
    transparent 70%
  );
  opacity: 0.05;
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.05;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.08;
  }
}

.hero-content {
  max-width: var(--max-width);
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 1s ease-out;
}

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

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.title-line {
  display: block;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--text-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s ease-out backwards;
}

.title-line:nth-child(2) {
  animation-delay: 0.2s;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 500px;
  line-height: 1.7;
  animation: fadeInUp 1s ease-out 0.4s backwards;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.6s backwards;
}

/* Hero Visual */
.hero-visual {
  position: relative;
  height: 400px;
  animation: fadeInUp 1s ease-out 0.8s backwards;
}

.floating-shape {
  position: absolute;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  opacity: 0.6;
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 250px;
  height: 250px;
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.shape-2 {
  width: 180px;
  height: 180px;
  background: linear-gradient(
    225deg,
    var(--accent-secondary),
    var(--accent-primary)
  );
  top: 20%;
  right: 10%;
  animation-delay: 2s;
}

.shape-3 {
  width: 150px;
  height: 150px;
  background: linear-gradient(
    315deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  bottom: 15%;
  left: 5%;
  animation-delay: 4s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
  background-color: var(--accent-secondary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(220, 38, 38, 0.4);
}

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

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ===================================
   Sections
   =================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

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

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.title-underline {
  width: 60px;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  margin: 0 auto;
  border-radius: 2px;
}

/* ===================================
   About Section
   =================================== */
.about {
  background-color: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  display: flex;
  justify-content: center;
}

.image-container {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
}

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

.image-placeholder {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--bg-accent), var(--bg-primary));
  border: 2px solid var(--border-color);
  color: var(--text-tertiary);
}

.about-subtitle {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.about-resume {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.resume-note {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-style: italic;
}

/* ===================================
   Projects Section
   =================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  align-items: stretch;
}

.project-card {
  background-color: var(--bg-secondary);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition:
    opacity 0.6s ease,
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.3s ease,
    border-color 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow:
    0 24px 40px -8px rgba(220, 38, 38, 0.18),
    var(--shadow-xl);
  border-color: var(--accent-primary);
}

body.dark-mode .project-card:hover {
  box-shadow:
    0 24px 40px -8px rgba(239, 68, 68, 0.25),
    var(--shadow-xl);
}

.project-image {
  width: 100%;
  height: 200px;
  background-color: var(--bg-accent);
  overflow: hidden;
  flex-shrink: 0;
}

.project-image .image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  border-radius: 0;
}

.project-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
  flex: 1;
}

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

.tag {
  padding: 0.375rem 0.875rem;
  background-color: var(--bg-accent);
  color: var(--text-secondary);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

.project-links {
  display: flex;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.project-link {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition-base);
}

.project-link:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

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

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

.contact-subtitle {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

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

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

.contact-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.contact-item svg {
  color: var(--accent-primary);
  flex-shrink: 0;
}

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

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-primary);
  transition: var(--transition-base);
}

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

/* Contact Form */
.contact-form {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

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

.form-group label {
  display: block;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem;
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

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

.form-message {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  display: none;
}

.form-message.success {
  background-color: rgba(34, 197, 94, 0.1);
  color: #16a34a;
  border: 1px solid rgba(34, 197, 94, 0.3);
  display: block;
}

.form-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
  display: block;
}

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

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 968px) {
  .nav-links {
    position: fixed;
    top: 73px;
    right: -100%;
    flex-direction: column;
    background-color: var(--bg-secondary);
    width: 100%;
    max-width: 300px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border-left: 1px solid var(--border-color);
    transition: right 0.3s ease;
    height: calc(100vh - 73px);
    gap: 1.5rem;
    align-items: flex-start;
  }

  .nav-links.active {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

  .theme-toggle {
    order: -1;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    margin-top: 2rem;
  }

  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

@media (max-width: 768px) {
  :root {
    --section-padding: 3rem 0;
  }

  .hero {
    min-height: auto;
    padding: 5rem 1.5rem 3rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .section-title {
    font-size: 2rem;
  }

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

  .about-stats {
    padding-top: 1.5rem;
    margin-top: 1.5rem;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .stat-number {
    font-size: 2rem;
  }

  .contact-form {
    padding: 1.5rem;
  }
}

/* ===================================
   Animations & Utilities
   =================================== */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Scroll Animation Observer */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Project cards: use same fade-in, hover pop activates after visible */
.project-card.animate-on-scroll {
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    box-shadow 0.3s ease,
    border-color 0.3s ease;
}

.project-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.project-card.visible:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow:
    0 24px 40px -8px rgba(220, 38, 38, 0.18),
    var(--shadow-xl);
  border-color: var(--accent-primary);
}

body.dark-mode .project-card.visible:hover {
  box-shadow:
    0 24px 40px -8px rgba(239, 68, 68, 0.25),
    var(--shadow-xl);
}