/* =========================================================
   TOKENS
   ========================================================= */
:root {
  /* Color */
  --bg: #0F172A;
  --bg-alt: #131F38;
  --bg-card: #16213A;
  --border: #24344F;
  --text-primary: #E7ECF3;
  --text-secondary: #94A3B8;
  --accent: #22D3EE;
  --accent-dim: #22D3EE33;
  --accent-2: #F59E0B;

  /* Type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --header-height: 72px;
  --max-width: 1100px;
  --radius: 10px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: var(--accent-dim); color: var(--text-primary); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* =========================================================
   HEADER / NAV
   ========================================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.3s ease;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.logo-bracket { color: var(--accent); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}
.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-index {
  color: var(--accent-2);
  font-size: 0.75rem;
  opacity: 0.85;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  z-index: 1100;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text-primary);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
   MOBILE NAV
   ========================================================= */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0; right: 0;
    bottom: 0;
    background: var(--bg);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 1.75rem;
    padding: 2rem 32px;
    transform: translateX(100%);
    transition: transform 0.35s ease;
  }
  .nav-menu.open {
    transform: translateX(0);
  }
  .nav-link {
    font-size: 1.4rem;
  }
}

/* =========================================================
   SECTIONS (shared)
   ========================================================= */
.section {
  padding: 7rem 24px;
  border-bottom: 1px solid var(--border);
}
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.skills { background: var(--bg-alt); }
.projects { background: var(--bg-alt); }

.section-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.section-lead {
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 3rem;
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  position: relative;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 15% 20%, var(--accent-dim), transparent 45%),
    var(--bg);
}
.hero-inner {
  max-width: 780px;
  padding: 0 24px;
}
.terminal-line {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}
.prompt { color: var(--accent); }
.typed { color: var(--text-primary); }
.cursor {
  display: inline-block;
  background: var(--accent);
  width: 8px;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}
.accent { color: var(--accent); }

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 620px;
  margin-bottom: 2.25rem;
}
.mono-chip {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.1em 0.5em;
  border-radius: 5px;
  color: var(--text-primary);
  white-space: nowrap;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  display: inline-block;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--accent);
  color: #06202B;
  font-weight: 600;
}
.btn-primary:hover { background: #4EE2F4; }
.btn-ghost {
  border-color: var(--border);
  color: var(--text-primary);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
}
.scroll-hint span {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(var(--accent), transparent);
  animation: scrollHint 2s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { transform: scaleY(0.6); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* =========================================================
   SKILLS
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}
.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.skill-card i { font-size: 2rem; }
.skill-card span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: center;
}

/* =========================================================
   EXPERIENCE / TIMELINE
   ========================================================= */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border);
}
.timeline-item {
  display: flex;
  gap: 1.5rem;
  position: relative;
}
.timeline-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  z-index: 1;
}
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  flex: 1;
}
.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.timeline-header h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-2);
  white-space: nowrap;
}
.timeline-company {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 0.65rem;
  font-weight: 500;
}
.timeline-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* =========================================================
   PROJECTS
   ========================================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.project-card-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.project-card-top i { font-size: 1.5rem; }
.project-card-top h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
}
.project-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  flex-grow: 1;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  color: var(--text-secondary);
}
.project-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
}
.project-link:hover { text-decoration: underline; }

/* =========================================================
   CONTACT
   ========================================================= */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact-icon {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.9rem 1.4rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.contact-icon i { font-size: 1.2rem; }
.contact-icon:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: var(--accent);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  text-align: center;
  padding: 2rem 24px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* =========================================================
   FADE-IN ON SCROLL
   ========================================================= */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .cursor, .scroll-hint span { animation: none; }
}