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

:root {
  --color-bg: #0a0a0a;
  --color-bg-alt: #111111;
  --color-surface: #1a1a1a;
  --color-border: #2a2a2a;
  --color-text: #e0e0e0;
  --color-text-muted: #888888;
  --color-accent: #00d4aa;
  --color-accent-hover: #00f0c0;
  --color-accent-dim: rgba(0, 212, 170, 0.1);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.3s ease;
  --max-width: 1100px;
}

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

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

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

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

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background var(--transition);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition);
}

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

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

.nav-toggle.active .hamburger {
  background: transparent;
}

.nav-toggle.active .hamburger::before {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 212, 170, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 212, 170, 0.04) 0%, transparent 50%),
    var(--color-bg);
}

.hero-content {
  text-align: center;
  padding: 2rem 0;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.15s forwards;
}

.hero-title {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.3s forwards;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 2rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.45s forwards;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.6s forwards;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeIn 1s ease 1.2s forwards;
}

.hero-scroll-indicator span {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease infinite;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: var(--font-main);
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 212, 170, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent-dim);
  color: var(--color-accent-hover);
  transform: translateY(-2px);
}

/* ===== SECTIONS ===== */
.section {
  padding: 6rem 0;
}

.section-heading {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 3rem;
  text-align: center;
  position: relative;
  letter-spacing: -0.5px;
}

.section-heading::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--color-accent);
  margin: 0.75rem auto 0;
  border-radius: 2px;
}

/* ===== ABOUT ===== */
.about {
  background: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.about-text p:first-child {
  color: var(--color-text);
}

.about-highlights {
  display: grid;
  gap: 1rem;
}

.highlight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: border-color var(--transition), transform var(--transition);
}

.highlight-card:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.highlight-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 60px;
  text-align: center;
}

.highlight-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}

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

.skill-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 1rem;
  transition: background var(--transition);
}

.skill-category:hover .skill-icon {
  background: rgba(0, 212, 170, 0.2);
}

.skill-category h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.skill-category li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--color-border);
}

.skill-category li:last-child {
  border-bottom: none;
}

/* ===== EXPERIENCE (Timeline) ===== */
.experience {
  background: var(--color-bg-alt);
}

.timeline {
  max-width: 650px;
  margin: 0 auto;
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg-alt);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.4rem;
}

.timeline-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

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

.project-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 1rem;
  transition: background var(--transition);
}

.project-card:hover .project-icon {
  background: rgba(0, 212, 170, 0.2);
}

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.project-tags span {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.project-link {
  font-size: 0.85rem;
  font-weight: 500;
  align-self: flex-start;
}

/* ===== CONTACT ===== */
.contact {
  background: var(--color-bg-alt);
}

.contact-intro {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  max-width: 750px;
  margin: 0 auto 2.5rem;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.contact-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0, 212, 170, 0.08);
  color: var(--color-text);
}

.contact-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  transition: background var(--transition);
}

.contact-card:hover .contact-card-icon {
  background: rgba(0, 212, 170, 0.2);
}

.contact-card h3 {
  font-size: 1rem;
  font-weight: 600;
}

.contact-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  word-break: break-all;
}

.contact-card-action {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-top: 0.5rem;
  transition: color var(--transition);
}

.contact-card:hover .contact-card-action {
  color: var(--color-accent-hover);
}

.contact-cta {
  text-align: center;
  margin-top: 1rem;
}

/* ===== FOOTER ===== */
.footer {
  padding: 2rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Scroll-reveal base class */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1rem 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s ease, opacity 0.35s ease;
  }

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

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 0.9rem 1.5rem;
    font-size: 1rem;
  }

  .nav-links a::after {
    display: none;
  }

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

  .about-highlights {
    grid-template-columns: repeat(3, 1fr);
  }

  .highlight-card {
    flex-direction: column;
    text-align: center;
    gap: 0.4rem;
    padding: 1rem;
  }

  .highlight-number {
    font-size: 1.5rem;
    min-width: unset;
  }

  .section {
    padding: 4rem 0;
  }

  .section-heading {
    font-size: 1.6rem;
    margin-bottom: 2rem;
  }

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

@media (max-width: 480px) {
  .about-highlights {
    grid-template-columns: 1fr;
  }

  .hero-name {
    font-size: 2.75rem;
  }
}

/* ===== BLOG ARTICLE ===== */
.blog-article {
  padding-top: 100px;
  padding-bottom: 4rem;
  min-height: 100vh;
}

.blog-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.blog-back {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  transition: color var(--transition);
}

.blog-back:hover {
  color: var(--color-accent-hover);
}

.blog-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.blog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.blog-meta-item {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.blog-header .project-tags {
  margin-top: 0.5rem;
}

.blog-section {
  margin-bottom: 2.5rem;
}

.blog-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.blog-section h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}

.blog-section p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.8;
}

.blog-section ul {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

.blog-section li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 0.5rem;
  list-style: disc;
}

.blog-section li strong {
  color: var(--color-text);
}

.blog-section code {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--color-accent);
}

.blog-callout {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.blog-callout h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.blog-callout p {
  margin-bottom: 0;
}

.blog-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}