/* =========================================================
   1. CSS VARIABLES
   ========================================================= */
:root {
  /* Light mode */
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --accent: #2563EB;
  --border: #E2E8F0;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 8px 20px rgba(15, 23, 42, 0.08);

  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --bg: #0F172A;
  --card: #1E293B;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --accent: #60A5FA;
  --border: #334155;

  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* =========================================================
   2. RESET
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* =========================================================
   3. BASE STYLES
   ========================================================= */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  z-index: 200;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
}

/* Focus states */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* =========================================================
   4. TYPOGRAPHY
   ========================================================= */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

/* =========================================================
   5. NAVIGATION
   ========================================================= */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: background-color var(--transition), color var(--transition);
}

.theme-toggle:hover {
  background-color: var(--border);
  color: var(--accent);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-menu.open .hamburger {
  background-color: transparent;
}

.nav-menu.open .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-menu.open .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

/* =========================================================
   6. HERO
   ========================================================= */
.hero {
  padding: 72px 0 88px;
}

.hero-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 56px;
  align-items: center;
}

.hero-image img {
  width: 260px;
  height: 260px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--card);
  box-shadow: var(--shadow-hover);
}


.hero-greeting {
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 2.9rem);
  margin-bottom: 10px;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-text {
  color: var(--text-secondary);
  font-size: 1.08rem;
  max-width: 540px;
  margin-bottom: 20px;
}



.hero-edu {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.hero-edu .dot {
  color: var(--border);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

.hero-socials {
  display: flex;
  gap: 18px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.social-link:hover {
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.btn-small {
  padding: 9px 16px;
  font-size: 0.88rem;
}

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

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

.btn-secondary {
  background-color: var(--card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

/* =========================================================
   7. ABOUT
   ========================================================= */
.about-content {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 1.03rem;
}

/* =========================================================
   8. LEARNING
   ========================================================= */
.learning-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.learning-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.learning-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.learning-card h3 {
  font-size: 1.05rem;
  margin-bottom: 16px;
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
}

.skill-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background-color: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
}

/* =========================================================
   9. PROJECTS
   ========================================================= */
.project-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
  display: grid;
  grid-template-columns: 1fr;
  transition: box-shadow var(--transition);
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
}

.project-card.featured {
  grid-template-columns: 1fr 1.2fr;
  /* grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr; */
}

.project-image #web-img {
  width: 100%;
  height: auto;
  object-fit: contain;
  /* object-fit: cover; */
  min-height: 240px; 
}

.project-image #group-img {
  width: 100%;
  height: 500px;
  object-fit: cover;
}

.project-details {
  padding: 32px;
}

.project-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 10px;
}

.project-details h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.project-block {
  margin-bottom: 18px;
}

.project-block h4 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.project-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0;
}

.tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.project-buttons {
  display: flex;
  gap: 12px;
}

.project-card.future {
  padding: 32px;
  text-align: center;
  border-style: dashed;
}

.project-card.future h3 {
  margin-bottom: 8px;
}

.project-card.future p {
  color: var(--text-secondary);
}

/* =========================================================
   10. JOURNEY
   ========================================================= */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 28px;
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 34px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--card);
  border: 3px solid var(--accent);
}

.timeline-item.current .timeline-marker {
  background-color: var(--accent);
}

.timeline-content h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.timeline-content p {
  color: var(--text-secondary);
  font-size: 0.94rem;
}

/* =========================================================
   11. CURRENTLY WORKING ON
   ========================================================= */
.current-card {
  max-width: 620px;
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background-color: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.current-card h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
}

.current-card p {
  color: var(--text-secondary);
}

/* =========================================================
   12. CONTACT
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.contact-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}

.contact-card svg {
  color: var(--accent);
  margin-bottom: 14px;
}

.contact-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  word-break: break-word;
}

.resume-download {
  text-align: center;
}

/* =========================================================
   13. FOOTER
   ========================================================= */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-name {
  font-weight: 700;
}

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

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.footer-copyright {
  color: var(--text-secondary);
  font-size: 0.85rem;
  width: 100%;
  text-align: center;
  margin-top: 8px;
}

/* =========================================================
   14. DARK MODE
   (handled via [data-theme="dark"] variables above)
   ========================================================= */

/* =========================================================
   15. RESPONSIVE DESIGN
   ========================================================= */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }

  .hero-image img {
    width: 200px;
    height: 200px;
  }

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

  .hero-buttons,
  .hero-socials,
  .hero-edu {
    justify-content: center;
  }

  .project-card.featured {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-menu {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 24px 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu li {
    width: 100%;
    padding: 10px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .project-card {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 480px) {
  .hero-image img {
    width: 170px;
    height: 170px;
  }

  .section {
    padding: 56px 0;
  }
}

/* =========================================================
   16. ACCESSIBILITY (reduced motion)
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Reveal-on-scroll base state */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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