/* ============================================================
   PORTFOLIO — style.css
   Dark premium engineering portfolio
   ============================================================ */

/* ---------- Google Fonts (loaded in HTML head) ---------- */

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --bg:          #0a0a0f;
  --bg2:         #0f0f1a;
  --surface:     rgba(255, 255, 255, 0.04);
  --surface-hov: rgba(255, 255, 255, 0.08);
  --border:      rgba(255, 255, 255, 0.08);
  --border-hov:  rgba(0, 212, 255, 0.4);

  --text:        #f0f0f8;
  --muted:       #8888aa;
  --caption:     #555577;

  --accent:      #00d4ff;
  --accent2:     #7c3aed;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --red:         #ff4d6d;

  /* Spacing */
  --section-pad: clamp(5rem, 10vw, 9rem);
  --container:   min(1200px, 90vw);

  /* Type */
  --font-head: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Radius */
  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;

  /* Transitions */
  --t: 0.35s cubic-bezier(0.23, 1, 0.32, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

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

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

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent2); border-radius: 999px; }

/* ---------- Selection ---------- */
::selection { background: var(--accent); color: #000; }

/* ============================================================
   ANIMATED GRADIENT BACKGROUND
   ============================================================ */
.bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.bg-canvas::before,
.bg-canvas::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
  animation: drift 18s ease-in-out infinite alternate;
}

.bg-canvas::before {
  width: 700px; height: 700px;
  top: -200px; left: -200px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
}

.bg-canvas::after {
  width: 600px; height: 600px;
  bottom: -150px; right: -150px;
  background: radial-gradient(circle, var(--accent2) 0%, transparent 70%);
  animation-delay: -9s;
  animation-direction: alternate-reverse;
}

@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(80px, 60px) scale(1.15); }
  100% { transform: translate(-40px, 80px) scale(0.9); }
}

/* ============================================================
   NAV
   ============================================================ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem clamp(1.5rem, 5vw, 4rem);
  transition: background var(--t), backdrop-filter var(--t), box-shadow var(--t);
}

nav.scrolled {
  background: rgba(10, 10, 15, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-logo {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

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

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  transition: color var(--t);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width var(--t);
}

.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--border-hov);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent) !important;
  background: rgba(0, 212, 255, 0.06);
  transition: background var(--t), box-shadow var(--t) !important;
}

.nav-cta:hover {
  background: rgba(0, 212, 255, 0.14) !important;
  box-shadow: 0 0 20px var(--accent-glow) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--t);
}

/* ============================================================
   HERO
   ============================================================ */
#hero {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem clamp(1.5rem, 5vw, 4rem) 5rem;
  overflow: hidden;
}

.hero-bg-img {
  position: absolute;
  inset: 0;
  background-image: url('hero-bg.png');
  background-size: cover;
  background-position: center;
  opacity: 0.22;
  z-index: 0;
}

.hero-bg-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, var(--bg) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  padding: 0.4rem 1rem;
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 999px;
  background: rgba(0, 212, 255, 0.06);
}

.hero-eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: blink 1.4s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
}

.hero h1 .name-gradient {
  background: linear-gradient(135deg, #fff 30%, var(--accent) 70%, var(--accent2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-typewriter {
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 2rem;
  min-height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.hero-typewriter .tw-static { color: var(--text); }

.cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--accent);
  margin-left: 2px;
  animation: blink-cursor 0.9s step-end infinite;
  vertical-align: middle;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: transform var(--t), box-shadow var(--t), background var(--t);
  cursor: pointer;
  border: none;
}

.btn:active { transform: scale(0.96) !important; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.45);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  background: var(--surface-hov);
  border-color: var(--border-hov);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--caption);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  animation: bounce 2s ease-in-out infinite;
}

.hero-scroll-hint svg { opacity: 0.5; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   SECTION SHARED
   ============================================================ */
section {
  position: relative;
  z-index: 1;
  padding: var(--section-pad) clamp(1.5rem, 5vw, 4rem);
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 1.5px;
  background: var(--accent);
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 3.5rem;
  line-height: 1.7;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-stagger.visible > *:nth-child(1) { opacity:1; transform:none; transition-delay:0.05s; }
.reveal-stagger.visible > *:nth-child(2) { opacity:1; transform:none; transition-delay:0.15s; }
.reveal-stagger.visible > *:nth-child(3) { opacity:1; transform:none; transition-delay:0.25s; }
.reveal-stagger.visible > *:nth-child(4) { opacity:1; transform:none; transition-delay:0.35s; }
.reveal-stagger.visible > *:nth-child(5) { opacity:1; transform:none; transition-delay:0.45s; }
.reveal-stagger.visible > *:nth-child(6) { opacity:1; transform:none; transition-delay:0.55s; }
.reveal-stagger.visible > *:nth-child(7) { opacity:1; transform:none; transition-delay:0.65s; }
.reveal-stagger.visible > *:nth-child(8) { opacity:1; transform:none; transition-delay:0.75s; }

/* ============================================================
   SKILLS
   ============================================================ */
#skills { background: var(--bg2); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.4rem 1rem;
  text-align: center;
  transition: background var(--t), border-color var(--t), transform var(--t), box-shadow var(--t);
  cursor: default;
}

.skill-card:hover {
  background: var(--surface-hov);
  border-color: var(--border-hov);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: 0.6rem;
  line-height: 1;
}

.skill-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ============================================================
   PROJECTS
   ============================================================ */
#projects { background: var(--bg); }

.projects-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.25rem;
}

/* Card layout variations */
.project-card { grid-column: span 6; }
.project-card.featured { grid-column: span 8; }
.project-card.small { grid-column: span 4; }

.project-card-inner {
  height: 100%;
  min-height: 280px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background var(--t), border-color var(--t), transform var(--t), box-shadow var(--t);
  overflow: hidden;
  position: relative;
}

.project-card-inner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--t);
}

.project-card-inner:hover {
  background: var(--surface-hov);
  border-color: var(--border-hov);
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0, 212, 255, 0.12);
}

.project-card-inner:hover::before { opacity: 1; }

.project-category {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.project-title {
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.project-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1.25rem;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: rgba(255,255,255,0.03);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--t);
}

.project-link:hover { gap: 0.7rem; }

/* Card accent bar */
.card-accent-bar {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--t);
}

.project-card-inner:hover .card-accent-bar { transform: scaleX(1); }

/* ============================================================
   ABOUT
   ============================================================ */
#about { background: var(--bg2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-text .big-quote {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.about-text .big-quote em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.about-body {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.9;
  margin-bottom: 2rem;
}

.about-stats {
  display: flex;
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.stat-num {
  font-family: var(--font-head);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.about-img-wrap {
  position: relative;
}

.about-img-frame {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 4/5;
  background: var(--surface);
}

.about-img-frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(20%) contrast(1.05);
  transition: filter var(--t), transform 0.8s ease;
}

.about-img-frame:hover img {
  filter: grayscale(0%) contrast(1.1);
  transform: scale(1.03);
}

.about-img-glow {
  position: absolute;
  width: 300px; height: 300px;
  background: radial-gradient(circle, var(--accent2) 0%, transparent 70%);
  border-radius: 50%;
  bottom: -80px; right: -80px;
  opacity: 0.25;
  filter: blur(60px);
  pointer-events: none;
  z-index: -1;
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  background: var(--bg);
  text-align: center;
}

.contact-card {
  max-width: 680px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: clamp(2.5rem, 5vw, 4rem) clamp(2rem, 5vw, 4rem);
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(0, 212, 255, 0.07) 0%, transparent 65%);
  pointer-events: none;
}

.contact-card .section-title { margin-bottom: 0.75rem; }

.contact-card p {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.contact-email {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 2rem;
  transition: opacity var(--t);
}

.contact-email:hover { opacity: 0.75; }

.social-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.75rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  background: rgba(255,255,255,0.03);
  transition: border-color var(--t), color var(--t), background var(--t);
}

.social-btn:hover {
  border-color: var(--border-hov);
  color: var(--accent);
  background: rgba(0, 212, 255, 0.06);
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2rem clamp(1.5rem, 5vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--caption);
}

footer a { color: var(--muted); transition: color var(--t); }
footer a:hover { color: var(--accent); }

/* ============================================================
   MOBILE NAV OPEN
   ============================================================ */
.nav-links.open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10, 10, 15, 0.97);
  backdrop-filter: blur(20px);
  z-index: 99;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  font-size: 1.5rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .project-card { grid-column: span 6; }
  .project-card.featured { grid-column: span 12; }
  .project-card.small { grid-column: span 6; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  #hero { padding-top: 7rem; }

  .project-card,
  .project-card.featured,
  .project-card.small {
    grid-column: span 12;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-img-wrap { order: -1; max-width: 340px; margin: 0 auto; }

  footer { flex-direction: column; gap: 0.5rem; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: clamp(2.5rem, 13vw, 3.5rem); }
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
  .about-stats { flex-wrap: wrap; gap: 1.5rem; }
}