/* ============================================
   Stanley Southwick — Modern Portfolio CSS
   ============================================ */

:root {
  --bg:           #080d1a;
  --bg-alt:       #0f1629;
  --card:         rgba(17, 24, 48, 0.7);
  --card-hover:   rgba(26, 38, 72, 0.9);
  --border:       rgba(59, 130, 246, 0.15);
  --border-hover: rgba(59, 130, 246, 0.4);
  --blue:         #2563eb;
  --blue-light:   #3b82f6;
  --blue-bright:  #60a5fa;
  --blue-glow:    #93c5fd;
  --accent:       #0ea5e9;
  --text:         #e2e8f0;
  --text-muted:   #94a3b8;
  --text-dim:     #64748b;
  --success:      #10b981;
  --font:         'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;
  --radius:       12px;
  --radius-lg:    20px;
  --shadow-blue:  0 4px 24px rgba(37, 99, 235, 0.2);
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --nav-h:        68px;
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.7; overflow-x: hidden; }
img { display: block; max-width: 100%; }
a { color: var(--blue-bright); text-decoration: none; transition: color 0.3s var(--ease); }
a:hover { color: var(--blue-glow); }
ul { list-style: none; }

/* === Skip link === */
.skip-link {
  position: absolute; top: -100%; left: 1rem;
  background: var(--blue); color: #fff;
  padding: 0.5rem 1rem; border-radius: 0 0 8px 8px;
  font-weight: 600; z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* === Layout === */
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

/* === Scroll animations === */
.fade-up { opacity: 0; transform: translateY(28px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }
.fade-up:nth-child(5) { transition-delay: 0.4s; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.5rem; border-radius: 8px;
  font-size: 0.9rem; font-weight: 600; cursor: pointer;
  transition: all 0.3s var(--ease); border: none;
  text-decoration: none; letter-spacing: 0.01em; font-family: var(--font);
}
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 0 20px rgba(37,99,235,0.3); }
.btn-primary:hover { background: var(--blue-light); color: #fff; box-shadow: 0 0 30px rgba(59,130,246,0.5); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--blue-bright); border: 1px solid var(--border-hover); }
.btn-outline:hover { background: rgba(59,130,246,0.1); color: var(--blue-glow); border-color: var(--blue-bright); transform: translateY(-2px); }
.btn-sm { padding: 0.45rem 1rem; font-size: 0.82rem; }

/* === Navigation === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 1000;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  background: rgba(8,13,26,0.8); border-bottom: 1px solid var(--border);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.nav.scrolled { background: rgba(8,13,26,0.97); border-color: var(--border-hover); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav__logo { font-size: 1.05rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.nav__logo span { color: var(--blue-bright); }
.nav__logo:hover { color: var(--text); }
.nav__links { display: flex; align-items: center; gap: 2rem; }
.nav__links a {
  font-size: 0.875rem; font-weight: 500; color: var(--text-muted);
  letter-spacing: 0.02em; position: relative;
}
.nav__links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--blue-bright);
  transition: width 0.3s var(--ease); border-radius: 2px;
}
.nav__links a:hover, .nav__links a.active { color: var(--text); }
.nav__links a:hover::after, .nav__links a.active::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 0.75rem; }
.nav__hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
.nav__hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s var(--ease); }

/* Mobile menu overlay */
.nav__mobile {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: rgba(8,13,26,0.98); backdrop-filter: blur(20px);
  flex-direction: column; align-items: center; justify-content: center; gap: 2rem;
}
.nav__mobile.open { display: flex; }
.nav__mobile a { font-size: 1.6rem; font-weight: 700; color: var(--text); transition: color 0.3s var(--ease); }
.nav__mobile a:hover { color: var(--blue-bright); }
.nav__mobile-close { position: absolute; top: 1.5rem; right: 1.5rem; background: none; border: none; color: var(--text-muted); font-size: 1.5rem; cursor: pointer; padding: 0.5rem; transition: color 0.3s var(--ease); }
.nav__mobile-close:hover { color: var(--text); }

/* === Hero === */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden; padding-top: var(--nav-h);
}
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,235,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 60% 40% at 20% 80%, rgba(14,165,233,0.08) 0%, transparent 60%);
}
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}
.hero__content { position: relative; z-index: 1; max-width: 720px; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--blue-bright); margin-bottom: 1.5rem; padding: 0.4rem 1rem;
  border-radius: 100px; background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.2);
}
.hero__name {
  font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff 30%, var(--blue-glow) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero__role { font-size: clamp(1rem, 2.5vw, 1.3rem); font-weight: 500; color: var(--blue-bright); margin-bottom: 1.25rem; }
.hero__bio { font-size: 1.05rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 2.5rem; max-width: 580px; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__scroll {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.1em; text-transform: uppercase;
  animation: bounce 2s infinite; z-index: 1;
}
.hero__scroll i { font-size: 1rem; }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* === Section shared === */
section { padding: 6rem 0; }
.section-label {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--blue-bright); margin-bottom: 0.6rem;
}
.section-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 1rem; }
.section-line { width: 40px; height: 3px; background: linear-gradient(90deg, var(--blue), var(--accent)); border-radius: 3px; margin-bottom: 2rem; }
.section-subtitle { font-size: 1rem; color: var(--text-muted); max-width: 560px; line-height: 1.8; }

/* === About === */
.about { background: var(--bg-alt); }
.about__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 5rem; align-items: center; }
.about__text p { color: var(--text-muted); margin-bottom: 1.25rem; font-size: 1rem; line-height: 1.85; }
.about__actions { margin-top: 2rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.skills-block { display: flex; flex-direction: column; gap: 1.5rem; }
.skills-group h4 { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.75rem; }
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  display: inline-flex; align-items: center; padding: 0.3rem 0.75rem;
  border-radius: 6px; font-size: 0.78rem; font-weight: 500;
  background: rgba(37,99,235,0.1); color: var(--blue-bright);
  border: 1px solid rgba(37,99,235,0.2); transition: all 0.3s var(--ease);
}
.tag:hover { background: rgba(37,99,235,0.2); border-color: rgba(59,130,246,0.5); transform: translateY(-1px); }

/* === Projects === */
.projects__header { margin-bottom: 3rem; }
.projects__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 1.5rem; }
.project-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all 0.3s var(--ease); display: flex; flex-direction: column;
  backdrop-filter: blur(8px); position: relative;
}
.project-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent)); opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.project-card:hover { border-color: var(--border-hover); transform: translateY(-5px); box-shadow: var(--shadow-blue); }
.project-card:hover::before { opacity: 1; }
.project-card__img { width: 100%; height: 175px; object-fit: cover; opacity: 0.65; transition: opacity 0.3s var(--ease); }
.project-card:hover .project-card__img { opacity: 0.85; }
.project-card__body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.project-card__num { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue-bright); margin-bottom: 0.4rem; }
.project-card__title { font-size: 1.15rem; font-weight: 700; color: var(--text); margin-bottom: 0.65rem; }
.project-card__desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.75; flex: 1; margin-bottom: 1rem; }
.project-card__tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1.25rem; }
.project-card__tag { font-size: 0.7rem; font-weight: 500; padding: 0.18rem 0.55rem; border-radius: 4px; background: rgba(14,165,233,0.1); color: var(--accent); border: 1px solid rgba(14,165,233,0.2); }
.project-card__footer { display: flex; align-items: center; justify-content: space-between; padding-top: 1rem; border-top: 1px solid var(--border); }
.project-card__link { font-size: 0.82rem; font-weight: 600; color: var(--blue-bright); display: flex; align-items: center; gap: 0.4rem; transition: gap 0.3s var(--ease), color 0.3s var(--ease); }
.project-card__link:hover { color: var(--blue-glow); gap: 0.65rem; }
.badge { font-size: 0.68rem; font-weight: 600; padding: 0.18rem 0.6rem; border-radius: 100px; }
.badge-soon { background: rgba(100,116,139,0.1); color: var(--text-dim); border: 1px solid rgba(100,116,139,0.2); }
.badge-live { background: rgba(16,185,129,0.1); color: var(--success); border: 1px solid rgba(16,185,129,0.2); }

/* === Contact === */
.contact { background: var(--bg-alt); }
.contact__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.contact__intro p { color: var(--text-muted); font-size: 1rem; line-height: 1.8; margin-bottom: 2rem; }
.contact__methods { display: flex; flex-direction: column; gap: 0.85rem; }
.contact__method {
  display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  transition: all 0.3s var(--ease);
}
.contact__method:hover { border-color: var(--border-hover); background: var(--card-hover); }
.contact__method-icon {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  background: rgba(37,99,235,0.1); border: 1px solid rgba(37,99,235,0.2);
  display: flex; align-items: center; justify-content: center;
  color: var(--blue-bright); font-size: 0.95rem;
}
.contact__method-text span { display: block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.15rem; }
.contact__method-text a { font-size: 0.88rem; color: var(--text); font-weight: 500; }
.contact__method-text a:hover { color: var(--blue-bright); }

/* Form */
.form { display: flex; flex-direction: column; gap: 1.25rem; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form__group { display: flex; flex-direction: column; gap: 0.45rem; }
.form__group label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); }
.form__group input,
.form__group textarea {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.75rem 1rem; color: var(--text); font-family: var(--font);
  font-size: 0.95rem; transition: all 0.3s var(--ease); outline: none; width: 100%;
}
.form__group input:focus,
.form__group textarea:focus { border-color: var(--blue-light); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); background: var(--bg-alt); }
.form__group textarea { resize: vertical; min-height: 130px; }
.form__group input::placeholder,
.form__group textarea::placeholder { color: var(--text-dim); }
.form__submit { width: 100%; justify-content: center; padding: 0.85rem; font-size: 1rem; }

/* === Footer === */
.footer { padding: 2.5rem 0; border-top: 1px solid var(--border); }
.footer__inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem; }
.footer__copy { font-size: 0.82rem; color: var(--text-dim); }
.footer__socials { display: flex; gap: 1.25rem; }
.footer__socials a { font-size: 1.1rem; color: var(--text-dim); transition: color 0.3s var(--ease), transform 0.3s var(--ease); display: inline-block; }
.footer__socials a:hover { color: var(--blue-bright); transform: translateY(-2px); }

/* === Back to top === */
.back-top {
  position: fixed; bottom: 2rem; right: 2rem; width: 42px; height: 42px;
  border-radius: 10px; background: var(--blue); color: #fff; border: none;
  display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
  cursor: pointer; box-shadow: 0 4px 16px rgba(37,99,235,0.4);
  transition: all 0.3s var(--ease); opacity: 0; pointer-events: none;
  transform: translateY(10px); z-index: 100;
}
.back-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top:hover { background: var(--blue-light); transform: translateY(-2px); }

/* === Project page === */
.project-hero { padding-top: calc(var(--nav-h) + 4rem); padding-bottom: 4rem; position: relative; overflow: hidden; }
.project-hero::before { content: ''; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse 80% 80% at 50% 0%, rgba(37,99,235,0.1) 0%, transparent 70%); }
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.82rem; color: var(--text-dim); margin-bottom: 2rem; }
.breadcrumb a { color: var(--text-dim); transition: color 0.3s var(--ease); }
.breadcrumb a:hover { color: var(--blue-bright); }
.breadcrumb i { font-size: 0.6rem; }
.project-hero__num { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--blue-bright); margin-bottom: 0.75rem; }
.project-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 40%, var(--blue-glow));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 1rem; line-height: 1.1;
}
.project-hero__desc { font-size: 1.1rem; color: var(--text-muted); max-width: 600px; line-height: 1.8; }
.project-body { padding: 0 0 6rem; }
.project-body__grid { display: grid; grid-template-columns: 1fr 300px; gap: 4rem; align-items: start; }
.project-body__img { width: 100%; height: 160px; object-fit: cover; object-position: center; border-radius: var(--radius-lg); border: 1px solid var(--border); margin-bottom: 3rem; display: block; }
.project-body__img--graphic { height: 100px; object-fit: contain; background: rgba(15,20,40,0.6); }
.project-body__img--portrait { object-position: center 35%; }
.content-block { margin-bottom: 2.5rem; }
.content-block h2 { font-size: 1.15rem; font-weight: 700; color: var(--text); margin-bottom: 1rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--border); }
.content-block p { color: var(--text-muted); line-height: 1.85; font-size: 0.97rem; }
.content-block ul { display: flex; flex-direction: column; gap: 0.6rem; margin-top: 0.25rem; }
.content-block ul li { display: flex; align-items: flex-start; gap: 0.75rem; color: var(--text-muted); font-size: 0.95rem; line-height: 1.65; }
.content-block ul li::before { content: '▸'; color: var(--blue-bright); flex-shrink: 0; margin-top: 0.1em; }
.project-sidebar { position: sticky; top: calc(var(--nav-h) + 2rem); display: flex; flex-direction: column; gap: 1.25rem; }
.sidebar-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; backdrop-filter: blur(8px); }
.sidebar-card h3 { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 1rem; }
.project-links { display: flex; flex-direction: column; gap: 0.65rem; }
.project-links .btn { justify-content: center; width: 100%; }

/* === Inline code === */
code { font-family: var(--font-mono); font-size: 0.82em; background: rgba(59,130,246,0.1); color: var(--blue-bright); padding: 0.15em 0.45em; border-radius: 4px; border: 1px solid rgba(59,130,246,0.15); white-space: nowrap; }

/* === Stat row === */
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.5rem; }
.stat { background: rgba(37,99,235,0.06); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; transition: border-color 0.3s var(--ease); }
.stat:hover { border-color: var(--border-hover); }
.stat__value { display: block; font-size: 1.35rem; font-weight: 800; color: var(--blue-bright); letter-spacing: -0.02em; }
.stat__label { display: block; font-size: 0.68rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); margin-top: 0.3rem; }

/* === Pipeline steps (expandable) === */
.pipeline-steps { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.75rem; }
.pipeline-step {
  background: rgba(17,24,48,0.5); border: 1px solid var(--border);
  border-left: 2px solid var(--blue); border-radius: var(--radius);
  overflow: hidden; transition: border-color 0.3s var(--ease);
}
.pipeline-step:hover { border-color: var(--border-hover); border-left-color: var(--blue-bright); }
.pipeline-step[open] { border-left-color: var(--blue-bright); background: rgba(26,38,72,0.55); }
.pipeline-step > summary {
  list-style: none; cursor: pointer; padding: 0.85rem 1.15rem;
  display: flex; align-items: center; gap: 0.75rem;
  user-select: none;
}
.pipeline-step > summary::-webkit-details-marker { display: none; }
.pipeline-step__num {
  font-family: var(--font-mono); font-size: 0.65rem; font-weight: 700;
  color: var(--blue-bright); background: rgba(37,99,235,0.12);
  border: 1px solid rgba(37,99,235,0.25); padding: 0.12rem 0.45rem;
  border-radius: 4px; flex-shrink: 0;
}
.pipeline-step__icon { color: var(--blue-bright); font-size: 0.85rem; flex-shrink: 0; }
.pipeline-step__title { font-size: 0.9rem; font-weight: 700; color: var(--text); flex: 1; }
.pipeline-step__chevron { font-size: 0.7rem; color: var(--text-dim); transition: transform 0.3s var(--ease); margin-left: auto; }
.pipeline-step[open] .pipeline-step__chevron { transform: rotate(180deg); }
.pipeline-step__body { padding: 0 1.15rem 1rem 3.5rem; font-size: 0.85rem; color: var(--text-muted); line-height: 1.75; }

/* === Design decisions === */
.decision-list { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 0.75rem; }
.decision { background: rgba(17,24,48,0.5); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; transition: border-color 0.3s var(--ease); }
.decision:hover { border-color: var(--border-hover); }
.decision__title { font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 0.4rem; }
.decision__body { font-size: 0.85rem; color: var(--text-muted); line-height: 1.75; margin: 0; }

/* === Misc project page helpers === */
.table-note { font-size: 0.78rem; color: var(--text-dim); margin-top: 0.65rem; line-height: 1.6; }
.content-block p + p { margin-top: 1rem; }
.dataset-list { list-style: none; display: flex; flex-direction: column; gap: 0.3rem; margin-top: 0.5rem; }
.dataset-list li { font-size: 0.85rem; color: var(--text-muted); display: flex; justify-content: space-between; }
.dataset-list li strong { color: var(--text); font-weight: 600; }

/* === Tables === */
.content-table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.85rem; overflow-x: auto; display: block; }
.content-table th { text-align: left; padding: 0.55rem 0.85rem; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); border-bottom: 1px solid var(--border); white-space: nowrap; }
.content-table td { padding: 0.55rem 0.85rem; color: var(--text-muted); border-bottom: 1px solid rgba(59,130,246,0.07); line-height: 1.5; }
.content-table tr:last-child td { border-bottom: none; }
.content-table tr.highlight td { color: var(--text); font-weight: 600; background: rgba(37,99,235,0.05); }

/* === File tree === */
.file-tree {
  font-family: var(--font-mono); font-size: 0.82rem;
  background: rgba(8,13,26,0.7); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1rem; line-height: 1;
}
.file-tree details { margin: 0; }
.file-tree summary {
  list-style: none; cursor: pointer; padding: 0.28rem 0.5rem;
  border-radius: 4px; display: flex; align-items: center; gap: 0.5rem;
  color: var(--text-muted); transition: all 0.2s; user-select: none;
}
.file-tree summary::-webkit-details-marker { display: none; }
.file-tree summary:hover { color: var(--text); background: rgba(59,130,246,0.07); }
.file-tree details[open] > summary { color: var(--blue-glow); }
.file-tree .ft-icon { font-size: 0.75rem; flex-shrink: 0; }
.file-tree .ft-folder { color: var(--blue-bright); }
.file-tree .ft-children { padding-left: 1.1rem; border-left: 1px solid var(--border); margin-left: 0.75rem; margin-top: 0; }
.file-tree .ft-file { display: flex; align-items: center; gap: 0.5rem; padding: 0.28rem 0.5rem; border-radius: 4px; transition: background 0.2s; }
.file-tree .ft-file:hover { background: rgba(59,130,246,0.07); }
.file-tree .ft-file .ft-icon { color: var(--text-dim); }
.file-tree .ft-file a { color: var(--text-muted); transition: color 0.2s; text-decoration: none; flex: 1; }
.file-tree .ft-file a:hover { color: var(--blue-bright); }
.file-tree .ft-comment { color: var(--text-dim); font-size: 0.74rem; margin-left: auto; padding-left: 1rem; white-space: nowrap; }
.file-tree .ft-ignored { opacity: 0.4; font-style: italic; }
.file-tree .ft-root { color: var(--text); font-weight: 600; margin-bottom: 0.35rem; display: flex; align-items: center; gap: 0.5rem; padding: 0.28rem 0.5rem; }

/* === Notebook cards (project-2) === */
.notebook-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; margin-top: 0.75rem; }
.notebook-card { background: rgba(17,24,48,0.5); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.2rem; transition: all 0.3s var(--ease); display: flex; flex-direction: column; }
.notebook-card:hover { border-color: var(--border-hover); background: rgba(26,38,72,0.55); transform: translateY(-2px); }
.notebook-card__header { display: flex; align-items: center; gap: 0.55rem; margin-bottom: 0.6rem; }
.notebook-card__icon { color: var(--blue-bright); font-size: 0.85rem; flex-shrink: 0; }
.notebook-card__title { font-size: 0.9rem; font-weight: 700; color: var(--text); }
.notebook-card__desc { font-size: 0.83rem; color: var(--text-muted); line-height: 1.72; flex: 1; margin-bottom: 0.75rem; }
.notebook-card__tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.75rem; }
.notebook-card__tag { font-size: 0.68rem; font-weight: 500; padding: 0.12rem 0.45rem; border-radius: 4px; background: rgba(14,165,233,0.08); color: var(--accent); border: 1px solid rgba(14,165,233,0.18); }
.notebook-card__link { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.78rem; font-weight: 600; color: var(--blue-bright); padding: 0.3rem 0.65rem; border: 1px solid var(--border); border-radius: 6px; margin-top: auto; align-self: flex-start; transition: all 0.2s var(--ease); }
.notebook-card__link:hover { color: var(--blue-glow); border-color: var(--border-hover); background: rgba(59,130,246,0.07); }
@media (max-width: 640px) { .notebook-grid { grid-template-columns: 1fr; } }

/* === Certification cards (project-4) === */
.cert-section { margin-top: 2rem; }
.cert-section + .cert-section { margin-top: 3rem; padding-top: 2.5rem; border-top: 1px solid var(--border); }
.cert-section-hd { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1.25rem; }
.cert-section-hd h3 { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-dim); margin: 0; }
.cert-section-count { font-size: 0.65rem; font-weight: 700; background: rgba(59,130,246,0.12); color: var(--blue-bright); border: 1px solid var(--border); border-radius: 20px; padding: 0.1rem 0.55rem; }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.cert-grid--2col { grid-template-columns: repeat(2, 1fr); }
.cert-card { background: rgba(17,24,48,0.85); border: 1px solid rgba(59,130,246,0.22); border-left: 4px solid var(--cert-color, var(--blue)); border-radius: var(--radius); display: flex; flex-direction: column; transition: all 0.3s var(--ease); box-shadow: 0 4px 18px rgba(0,0,0,0.4); }
.cert-card:hover { border-color: rgba(59,130,246,0.5); border-left-color: var(--cert-color, var(--blue)); transform: translateY(-4px); box-shadow: 0 10px 32px rgba(0,0,0,0.5); }
.cert-card__body { padding: 1.2rem; display: flex; flex-direction: column; flex: 1; }
.cert-card__hd { display: flex; align-items: center; gap: 0.85rem; margin-bottom: 0.9rem; padding-bottom: 0.9rem; border-bottom: 1px solid var(--border); }
.cert-card__badge { width: 46px; height: 46px; border-radius: 10px; background: var(--cert-color, var(--blue)); display: flex; align-items: center; justify-content: center; flex-shrink: 0; overflow: hidden; }
.cert-card__badge img { width: 26px; height: 26px; object-fit: contain; filter: brightness(0) invert(1); }
.cert-card__badge i { color: #fff; font-size: 1.2rem; }
.cert-card__hd-text { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; }
.cert-card__issuer { font-size: 0.69rem; font-weight: 700; color: var(--cert-color, var(--blue-bright)); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cert-card__date { font-size: 0.67rem; color: var(--text-dim); }
.cert-card__name { font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 0.5rem; line-height: 1.4; }
.cert-card__desc { font-size: 0.81rem; color: var(--text-muted); line-height: 1.72; flex: 1; margin-bottom: 0.8rem; }
.cert-card__tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.8rem; }
.cert-card__link { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.74rem; font-weight: 600; color: var(--cert-color, var(--blue-bright)); margin-top: auto; transition: opacity 0.2s; }
.cert-card__link:hover { opacity: 0.7; color: var(--cert-color, var(--blue-bright)); }
@media (max-width: 900px) { .cert-grid { grid-template-columns: 1fr 1fr; } .cert-grid--2col { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .cert-grid, .cert-grid--2col { grid-template-columns: 1fr; } }

/* === Achievement cards (project-6) === */
.achievements-intro { margin-bottom: 3rem; }
.achievements-intro p { color: var(--text-muted); font-size: 1rem; line-height: 1.85; }
.achievements-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.achievement-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all 0.3s var(--ease);
  backdrop-filter: blur(8px); position: relative;
}
.achievement-card:hover { border-color: var(--border-hover); transform: translateY(-4px); box-shadow: var(--shadow-blue); }
.achievement-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent)); opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.achievement-card:hover::before { opacity: 1; }
.achievement-card__img-wrap { overflow: hidden; }
.achievement-card__img {
  width: 100%; height: 240px; object-fit: cover;
  transition: transform 0.5s var(--ease); display: block;
}
.achievement-card:hover .achievement-card__img { transform: scale(1.04); }
.achievement-card__body { padding: 1.5rem; }
.achievement-card__title {
  font-size: 1.05rem; font-weight: 700; color: var(--text);
  margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.6rem;
}
.achievement-card__title i { color: var(--blue-bright); font-size: 0.95rem; flex-shrink: 0; }
.achievement-card__desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.8; }

/* === Responsive === */
@media (max-width: 900px) {
  .about__grid, .contact__grid, .project-body__grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .project-sidebar { position: static; }
}
@media (max-width: 768px) {
  .nav__links, .nav__actions { display: none; }
  .nav__hamburger { display: flex; }
  .projects__grid { grid-template-columns: 1fr; }
  .achievements-grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  section { padding: 4rem 0; }
  .footer__inner { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .about__actions { flex-direction: column; }
}