/* ============================================================
   Custom Properties
   ============================================================ */
:root {
  /* Dark theme (default) */
  --bg: #0a192f;
  --bg-light: #112240;
  --bg-card: #1d3557;
  --accent: #64ffda;
  --accent-tint: rgba(100, 255, 218, 0.1);
  --text: #ccd6f6;
  --text-dim: #8892b0;
  --white: #e6f1ff;
  --shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  --nav-bg: rgba(10, 25, 47, 0.85);
  --map-filter: brightness(0.5) invert(1) contrast(3) hue-rotate(200deg)
    saturate(0.25) brightness(0.7);

  /* Invariants */
  --font-sans: "Poppins", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Space Mono", "Fira Code", monospace;
  --nav-h: 70px;
  --max-w: 1100px;
  --section-pad: 100px;
  --radius: 4px;
  --radius-lg: 12px;
  --ease: cubic-bezier(0.645, 0.045, 0.355, 1);
  --transition: all 0.25s var(--ease);
}

/* ============================================================
   Light theme
   ============================================================ */
:root[data-theme="light"] {
  --bg: #f5f7ff;
  --bg-light: #e8edf8;
  --bg-card: #dde3f0;
  --accent: #0f766e;
  --accent-tint: rgba(15, 118, 110, 0.08);
  --text: #1e293b;
  --text-dim: #475569;
  --white: #0a192f;
  --shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.1);
  --nav-bg: rgba(245, 247, 255, 0.92);
  --map-filter: saturate(0.9) brightness(1.02);
}

/* Browser default: respect prefers-color-scheme when no manual override */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f7ff;
    --bg-light: #e8edf8;
    --bg-card: #dde3f0;
    --accent: #0f766e;
    --accent-tint: rgba(15, 118, 110, 0.08);
    --text: #1e293b;
    --text-dim: #475569;
    --white: #0a192f;
    --shadow: 0 10px 30px -15px rgba(0, 0, 0, 0.1);
    --nav-bg: rgba(245, 247, 255, 0.92);
    --map-filter: saturate(0.9) brightness(1.02);
  }
}

/* ============================================================
   Reset & Base
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  opacity: 0.8;
}
img {
  max-width: 100%;
  display: block;
}
ul {
  list-style: none;
}

/* ============================================================
   Navigation
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 200;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

#navbar.scrolled {
  border-bottom-color: rgba(100, 255, 218, 0.08);
  box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}
.nav-logo:hover {
  opacity: 1;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links {
  display: flex;
  gap: 28px;
  counter-reset: nav-counter;
}

.nav-links li {
  counter-increment: nav-counter;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: var(--text);
  padding: 8px 0;
}

.nav-links a::before {
  content: "0" counter(nav-counter) ". ";
  color: var(--accent);
}

.nav-links a:hover {
  color: var(--accent);
  opacity: 1;
}

.btn-nav {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 10px 18px;
}
.btn-nav:hover {
  background: var(--accent-tint);
  opacity: 1;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 201;
  position: relative;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  transform-origin: center;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Sidebar Social (desktop only)
   ============================================================ */
.side-social {
  position: fixed;
  bottom: 0;
  left: 30px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.side-social a {
  color: var(--text-dim);
  font-size: 1rem;
  transition: var(--transition);
}
.side-social a:hover {
  color: var(--accent);
  transform: translateY(-3px);
  opacity: 1;
}

.side-line {
  width: 1px;
  height: 80px;
  background: var(--text-dim);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 14px 28px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  color: var(--accent);
  border: 1px solid var(--accent);
  background: transparent;
}
.btn-primary:hover {
  background: var(--accent-tint);
  opacity: 1;
}

.btn-outline {
  color: var(--text);
  border: 1px solid var(--text-dim);
}
.btn-outline:hover {
  color: var(--accent);
  border-color: var(--accent);
  opacity: 1;
}

/* ============================================================
   Hero
   ============================================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--nav-h) 40px 0;
  max-width: var(--max-w);
  margin: 0 auto;
}

.hero-content {
  max-width: 680px;
}

.hero-intro {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-name {
  font-size: clamp(40px, 8vw, 80px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 10px;
}

.hero-tagline {
  font-size: clamp(28px, 5vw, 58px);
  font-weight: 700;
  color: var(--text-dim);
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ============================================================
   Section Common
   ============================================================ */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-pad) 40px;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 50px;
  white-space: nowrap;
}

.section-heading::after {
  content: "";
  display: block;
  height: 1px;
  background: var(--bg-light);
  width: 300px;
  max-width: 40vw;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  font-weight: 400;
}

.section-sub {
  color: var(--text-dim);
  margin-top: -30px;
  margin-bottom: 50px;
  font-size: 1rem;
}

/* ============================================================
   About
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 16px;
}

.about-text strong {
  color: var(--accent);
  font-weight: 500;
}

.text-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.text-link:hover {
  border-bottom-color: var(--accent);
  opacity: 1;
}

.tech-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 20px;
  margin-top: 24px;
}

.tech-list li {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: var(--text-dim);
  padding-left: 18px;
  position: relative;
}

.tech-list li::before {
  content: "▸";
  color: var(--accent);
  position: absolute;
  left: 0;
}

/* Photo */
.about-photo {
  position: relative;
}

.about-photo::after {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  z-index: 0;
  transition: var(--transition);
  pointer-events: none;
}

.about-photo a {
  display: block;
  position: relative;
  z-index: 1;
}

.about-photo img {
  border-radius: var(--radius-lg);
  filter: grayscale(25%) contrast(1.05);
  transition: var(--transition);
  width: 100%;
}

.about-photo:hover::after {
  inset: 8px -8px -8px 8px;
}
.about-photo a:hover img {
  filter: none;
  opacity: 1;
}

/* ============================================================
   Skills
   ============================================================ */
.skills-container {
  max-width: 680px;
}

.skill-bar {
  margin-bottom: 22px;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text);
  margin-bottom: 8px;
}

.skill-pct {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
}

.skill-track {
  height: 4px;
  background: var(--bg-light);
  border-radius: 99px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a8edea);
  border-radius: 99px;
  width: 0%;
  transition: width 1s var(--ease);
}

/* ============================================================
   Portfolio
   ============================================================ */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.portfolio-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(100, 255, 218, 0.07);
  transition:
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
  display: flex;
  flex-direction: column;
}

.portfolio-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(100, 255, 218, 0.2);
}

.portfolio-card-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.portfolio-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
  transition: transform 0.4s var(--ease);
}

.portfolio-card:hover .portfolio-card-img img {
  transform: scale(1.06);
}

.portfolio-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.portfolio-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 10px;
  line-height: 1.4;
}

.portfolio-card-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.portfolio-card {
  cursor: pointer;
}

.portfolio-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
}

.portfolio-card-more {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition);
}
.portfolio-card:hover .portfolio-card-more {
  color: var(--accent);
}

.portfolio-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 6px 14px;
  flex-shrink: 0;
}
.portfolio-card-link:hover {
  background: var(--accent-tint);
  opacity: 1;
}

/* ============================================================
   Portfolio Modal
   ============================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s ease,
    visibility 0.3s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-light);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(24px);
  transition: transform 0.3s ease;
}

.modal-backdrop.open .modal {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 7px;
  border-radius: 50%;
  transition: var(--transition);
  z-index: 1;
  line-height: 1;
}
.modal-close:hover {
  color: var(--accent);
  background: var(--accent-tint);
}

.modal-img {
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-img img {
  max-height: 140px;
  max-width: 100%;
  object-fit: contain;
}

.modal-body {
  padding: 28px 32px 32px;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 14px;
  line-height: 1.4;
  padding-right: 24px;
}

.modal-desc {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.85;
  margin-bottom: 24px;
}

@media (max-width: 520px) {
  .modal-body {
    padding: 22px 20px 24px;
  }
  .modal-img {
    padding: 24px;
  }
}

/* ============================================================
   Services
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 60px;
}

.service-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid rgba(100, 255, 218, 0.07);
  transition:
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

.service-card:hover {
  border-color: rgba(100, 255, 218, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.service-icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 14px;
}

.service-card p {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.75;
}

.services-cta {
  text-align: center;
  padding: 40px;
  border-top: 1px solid var(--bg-light);
}

.services-cta p {
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 20px;
}

/* ============================================================
   Map
   ============================================================ */
#map {
  height: 380px;
  filter: var(--map-filter);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  padding: 40px;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-social a {
  color: var(--text-dim);
  font-size: 1.1rem;
  transition: var(--transition);
}
.footer-social a:hover {
  color: var(--accent);
  transform: translateY(-3px);
  opacity: 1;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ============================================================
   Theme Toggle
   ============================================================ */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

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

/* ============================================================
   Animations
   ============================================================ */
.animate-fade-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.6s ease forwards;
  animation-delay: var(--delay, 0s);
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}

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

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1080px) {
  .side-social {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --section-pad: 70px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-inner {
    padding: 0 20px;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-light);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: var(--nav-h);
    gap: 28px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 190;
    overflow-y: auto;
  }

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

  .nav-links {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .nav-links a {
    font-size: 1.2rem;
  }

  #hero {
    padding: 120px 24px 60px;
  }

  .section {
    padding: var(--section-pad) 24px;
  }

  .section-heading::after {
    display: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }

  .about-photo {
    max-width: 280px;
    margin: 0 auto;
  }

  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  footer {
    padding: 30px 24px;
  }
}

@media (max-width: 520px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .tech-list {
    grid-template-columns: 1fr;
  }

  .service-card {
    padding: 28px;
  }
}