/* ==========================================================================
   DESIGN TOKENS
   ========================================================================== */
:root {
  --bg:            #0a0e17;
  --bg-elevated:   #10151f;
  --surface:       #161d2c;
  --surface-hover: #1c2438;
  --border:        #232b3d;
  --text:          #e8ecf4;
  --text-muted:    #8a93a6;
  --accent:        #5b8def;
  --accent-dim:    rgba(91, 141, 239, 0.15);
  --accent-2:      #f2a65a;
  --accent-2-dim:  rgba(242, 166, 90, 0.15);
  --success:       #5ed3a4;

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

  --container: 1080px;
  --radius: 10px;
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

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

html { scroll-behavior: smooth; }

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

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

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

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

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }

section { padding: 8rem 1.5rem; max-width: var(--container); margin: 0 auto; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
}

.section-head { margin-bottom: 3rem; }
.section-head h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }

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

/* Reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   BOOT LOADER
   ========================================================================== */
.loader {
  position: fixed; inset: 0; z-index: 999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
.loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-lines {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--success);
  white-space: pre-line;
  min-width: 260px;
}

/* ==========================================================================
   SIGNATURE: MOUNTAIN CONTOUR SCROLL PROGRESS RAIL
   ========================================================================== */
.progress-rail {
  position: fixed;
  left: 0; top: 0;
  width: 40px; height: 100vh;
  z-index: 40;
  pointer-events: none;
  opacity: 0.9;
}
.progress-rail svg { width: 100%; height: 100%; }
.progress-path-bg { fill: none; stroke: var(--border); stroke-width: 1.5; }
.progress-path-fg {
  fill: none; stroke: var(--accent); stroke-width: 2;
  stroke-dasharray: 1400; stroke-dashoffset: 1400;
  filter: drop-shadow(0 0 4px rgba(91,141,239,0.6));
}
@media (max-width: 800px) { .progress-rail { width: 18px; opacity: 0.6; } }

/* ==========================================================================
   NAV
   ========================================================================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 2rem 1.1rem 3.2rem;
  background: rgba(10, 14, 23, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text);
  font-size: 1rem;
}
.cursor-blink { color: var(--accent); animation: blink 1.1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a[data-nav] {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition);
}
.nav-links a[data-nav]::after {
  content: ''; position: absolute; left: 0; bottom: -6px; width: 0; height: 1px;
  background: var(--accent); transition: width var(--transition);
}
.nav-links a[data-nav]:hover, .nav-links a[data-nav].active { color: var(--text); }
.nav-links a[data-nav]:hover::after, .nav-links a[data-nav].active::after { width: 100%; }

.btn-resume {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border: 1px solid var(--border);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition);
}
.btn-resume:hover { border-color: var(--accent); background: var(--accent-dim); }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 0.5rem;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); transition: var(--transition); }

@media (max-width: 860px) {
  .nav { padding: 1rem 1.25rem; }
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 1.25rem;
    background: var(--bg-elevated); border-bottom: 1px solid var(--border);
    padding: 1.5rem; transform: translateY(-120%); opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-toggle { display: flex; }
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 6rem 1.5rem 4rem 4rem;
  max-width: 1080px; margin: 0 auto;
  position: relative;
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; width: 100%;
}

.terminal-window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}
.terminal-bar {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.7rem 0.9rem; background: var(--bg-elevated); border-bottom: 1px solid var(--border);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ec6a5e; } .dot-y { background: #f5bd4f; } .dot-g { background: #61c454; }
.terminal-title { margin-left: 0.6rem; font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); }
.terminal-body {
  font-family: var(--font-mono); font-size: 0.88rem; line-height: 1.9;
  padding: 1.4rem; min-height: 220px; color: var(--text);
}
.terminal-body .prompt { color: var(--success); }
.terminal-body .output { color: var(--text-muted); display: block; }
.terminal-body .type-cursor { display: inline-block; width: 7px; height: 1em; background: var(--accent); vertical-align: middle; animation: blink 0.9s step-end infinite; }

.hero-text .eyebrow { opacity: 0.9; }
.hero-name { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.1; margin-bottom: 0.9rem; }
.hero-role { color: var(--text-muted); font-size: 1.05rem; max-width: 34ch; margin-bottom: 2rem; }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono); font-size: 0.85rem;
  padding: 0.8rem 1.5rem; border-radius: var(--radius);
  display: inline-flex; align-items: center; gap: 0.5rem;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #051022; font-weight: 600; }
.btn-primary:hover { transform: translateY(-2px); background: #6f9bf3; }
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); background: var(--accent-dim); transform: translateY(-2px); }
.btn.full { width: 100%; justify-content: center; }

.scroll-cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted);
  animation: floaty 2.4s ease-in-out infinite;
}
@keyframes floaty { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

@media (max-width: 860px) {
  .hero { padding: 6rem 1.5rem 3rem; }
  .hero-inner { grid-template-columns: 1fr; }
}

/* ==========================================================================
   SECTIONS: shared paddings adjust with left rail
   ========================================================================== */
.about, .skills, .projects, .experience, .contact { padding-left: 4rem; }
@media (max-width: 860px) { .about, .skills, .projects, .experience, .contact { padding-left: 1.5rem; } }

/* ABOUT */
.about-grid { display: grid; grid-template-columns: 280px 1fr; gap: 3rem; align-items: start; }
.photo-frame {
  aspect-ratio: 1; border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(135deg, var(--surface), var(--bg-elevated));
  border: 1px solid var(--border);
  position: relative; display: flex; align-items: center; justify-content: center;
}
.photo-frame img { width: 100%; height: 100%; object-fit: cover; }
.photo-fallback-text { display: none; font-family: var(--font-display); font-size: 3.5rem; color: var(--accent); }
.photo-fallback .photo-fallback-text { display: block; }
.status-chip {
  margin-top: 1rem; display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--success);
  border: 1px solid var(--border); border-radius: 999px; padding: 0.4rem 0.9rem;
}
.dot-live { width: 7px; height: 7px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 3px rgba(94,211,164,0.2); }

.about-content p { color: var(--text-muted); margin-bottom: 1.1rem; max-width: 60ch; }
.about-facts { display: grid; gap: 0.9rem; margin-top: 1.5rem; }
.fact { display: flex; gap: 0.8rem; font-size: 0.92rem; border-top: 1px solid var(--border); padding-top: 0.7rem; }
.fact-label { font-family: var(--font-mono); color: var(--accent); min-width: 110px; font-size: 0.8rem; }
.fact-value { color: var(--text); }

@media (max-width: 700px) { .about-grid { grid-template-columns: 1fr; } .photo-frame { max-width: 200px; } }

/* SKILLS */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.2rem; }
.skill-group h3 { font-size: 0.95rem; color: var(--text-muted); font-weight: 500; margin-bottom: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; }
.chip-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  font-family: var(--font-mono); font-size: 0.82rem;
  background: var(--surface); border: 1px solid var(--border);
  padding: 0.45rem 0.9rem; border-radius: 999px; color: var(--text);
  transition: border-color var(--transition), transform var(--transition);
}
.chip:hover { border-color: var(--accent); transform: translateY(-2px); }
.chip-row.small .chip { font-size: 0.74rem; padding: 0.3rem 0.7rem; }
@media (max-width: 700px) { .skills-grid { grid-template-columns: 1fr; } }

/* PROJECTS */
.filter-row { display: flex; gap: 0.7rem; margin-bottom: 2.2rem; flex-wrap: wrap; }
.filter-btn {
  font-family: var(--font-mono); font-size: 0.82rem;
  background: transparent; border: 1px solid var(--border); color: var(--text-muted);
  padding: 0.5rem 1rem; border-radius: 999px; cursor: pointer;
  transition: all var(--transition);
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
.project-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.6rem; transition: border-color var(--transition), transform var(--transition);
  display: flex; flex-direction: column; gap: 0.8rem;
}
.project-card.hide { display: none; }
.project-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.project-top { display: flex; align-items: center; justify-content: space-between; }
.project-tag { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent-2); text-transform: uppercase; letter-spacing: 0.05em; }
.project-links { display: flex; gap: 0.8rem; }
.project-links a { color: var(--text-muted); transition: color var(--transition); font-size: 0.95rem; }
.project-links a:hover { color: var(--accent); }
.project-card h3 { font-size: 1.15rem; }
.project-card p { color: var(--text-muted); font-size: 0.92rem; }
.projects-note { margin-top: 1.6rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); opacity: 0.7; }

@media (max-width: 700px) { .project-grid { grid-template-columns: 1fr; } }

/* EXPERIENCE — sequential timeline, numbering is meaningful here */
.timeline { list-style: none; border-left: 1px solid var(--border); }
.timeline-item { position: relative; padding: 0 0 2.4rem 2.2rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-index {
  position: absolute; left: -14px; top: 0;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--accent);
  background: var(--bg); border: 1px solid var(--accent); border-radius: 50%;
  width: 28px; height: 28px; display: flex; align-items: center; justify-content: center;
}
.timeline-top { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.4rem; }
.timeline-top h3 { font-size: 1.05rem; }
.timeline-date { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); }
.timeline-body p { color: var(--text-muted); font-size: 0.92rem; max-width: 60ch; }

/* CONTACT */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.contact-info p { color: var(--text-muted); margin-bottom: 1.2rem; max-width: 32ch; }
.contact-email { font-family: var(--font-mono); font-size: 1.1rem; color: var(--accent); }
.social-row { display: flex; gap: 1rem; margin-top: 1.6rem; }
.social-row a {
  width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; color: var(--text-muted);
  transition: all var(--transition);
}
.social-row a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }

.contact-form { display: grid; gap: 1.1rem; }
.contact-form label { display: grid; gap: 0.4rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); }
.contact-form input, .contact-form textarea {
  font-family: var(--font-body); font-size: 0.95rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.75rem 0.9rem; resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--accent); }
.form-note { font-family: var(--font-mono); font-size: 0.8rem; color: var(--success); min-height: 1.2em; }

@media (max-width: 700px) { .contact-grid { grid-template-columns: 1fr; } }

/* FOOTER */
.footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 2rem 1.5rem 2rem 4rem; border-top: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-muted);
}
@media (max-width: 860px) { .footer { padding-left: 1.5rem; } }
.back-to-top {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
  transition: all var(--transition);
}
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }