/* Art direction: Integration engineer portfolio -> precise, technical, calm confidence
   Palette: cool neutral with teal accent (Nexus-based), evokes reliability and systems thinking
   Typography: Fraunces (display, editorial warmth) + General Sans (body, clean technical clarity)
   Density: balanced - generous section spacing, dense timeline content */

:root, [data-theme="light"] {
  --color-bg:             #f7f6f2;
  --color-surface:        #f9f8f5;
  --color-surface-2:      #fbfbf9;
  --color-surface-offset: #f3f0ec;
  --color-surface-offset-2: #edeae5;
  --color-surface-dynamic: #e6e4df;
  --color-divider:        #dcd9d5;
  --color-border:         #d4d1ca;

  --color-text:           #28251d;
  --color-text-muted:     #7a7974;
  --color-text-faint:     #bab9b4;
  --color-text-inverse:   #f9f8f4;

  --color-primary:        #01696f;
  --color-primary-hover:  #0c4e54;
  --color-primary-active: #0f3638;
  --color-primary-highlight: #cedcd8;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'General Sans', 'Inter', sans-serif;
}

[data-theme="dark"] {
  --color-bg:             #171614;
  --color-surface:        #1c1b19;
  --color-surface-2:      #201f1d;
  --color-surface-offset: #1d1c1a;
  --color-surface-offset-2: #22211f;
  --color-surface-dynamic: #2d2c2a;
  --color-divider:        #262523;
  --color-border:         #393836;
  --color-text:           #cdccca;
  --color-text-muted:     #797876;
  --color-text-faint:     #5a5957;
  --color-text-inverse:   #2b2a28;
  --color-primary:        #4f98a3;
  --color-primary-hover:  #227f8b;
  --color-primary-active: #1a626b;
  --color-primary-highlight: #313b3b;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  --space-1:  0.25rem; --space-2:  0.5rem; --space-3:  0.75rem; --space-4:  1rem;
  --space-5:  1.25rem; --space-6:  1.5rem; --space-8:  2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body, sans-serif);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; }

::selection { background: oklch(from var(--color-primary) l c h / 0.25); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

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

a, button, [role="button"], input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 1000; padding: var(--space-3) var(--space-5);
  background: var(--color-primary); color: white; border-radius: var(--radius-md);
}
.skip-link:focus { left: var(--space-4); top: var(--space-4); }

.container { max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
@media (max-width: 700px) { .container { padding-inline: var(--space-4); } }

.noise-overlay {
  position: fixed; inset: 0; pointer-events: none; z-index: 998; opacity: 0.025; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100; background: color-mix(in oklab, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--color-divider);
  transition: transform var(--transition-interactive);
}
.site-header.hide { transform: translateY(-100%); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-block: var(--space-4); }
.logo { display: flex; align-items: center; gap: var(--space-2); font-weight: 600; font-size: var(--text-sm); color: var(--color-text); }
.logo-mark { color: var(--color-primary); }
.main-nav { display: none; gap: var(--space-6); }
@media (min-width: 900px) { .main-nav { display: flex; } }
.main-nav a { font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 500; }
.main-nav a:hover, .main-nav a.active { color: var(--color-text); }
.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.icon-btn { display: grid; place-items: center; width: 36px; height: 36px; border-radius: var(--radius-md); color: var(--color-text-muted); }
.icon-btn:hover { background: var(--color-surface-offset); color: var(--color-text); }
#navToggle { display: grid; }
@media (min-width: 900px) { #navToggle { display: none; } }

.mobile-nav { display: none; flex-direction: column; padding: var(--space-4) var(--space-6); gap: var(--space-3); border-top: 1px solid var(--color-divider); }
.mobile-nav.open { display: flex; }
@media (min-width: 900px) { .mobile-nav { display: none !important; } }
.mobile-nav a { font-size: var(--text-base); padding-block: var(--space-2); color: var(--color-text); }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: var(--space-3) var(--space-6); border-radius: var(--radius-full); font-size: var(--text-sm); font-weight: 600; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-ghost { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }
.magnetic { position: relative; will-change: transform; }

/* ---------- Sections ---------- */
.section { padding-block: clamp(var(--space-16), 8vw, var(--space-24)); }
.section-offset { background: var(--color-surface); }
.section-label { display: flex; align-items: baseline; gap: var(--space-3); margin-bottom: var(--space-8); }
.section-number { font-size: var(--text-sm); color: var(--color-text-faint); font-weight: 600; }
.section-label h2 { font-size: var(--text-xl); font-weight: 600; }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(var(--space-20), 10vw, var(--space-32)) var(--space-16); position: relative; overflow: hidden; }
.hero-inner { max-width: var(--content-wide); position: relative; z-index: 1; }
.hero-grid { display: grid; gap: var(--space-12); align-items: center; }
@media (min-width: 980px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; } }
.hero-text { min-width: 0; }
.hero-visual { display: none; justify-self: center; }
@media (min-width: 980px) { .hero-visual { display: block; } }

.eyebrow { font-size: var(--text-sm); color: var(--color-primary); font-weight: 600; margin-bottom: var(--space-4); }
.hero-title { font-size: var(--text-2xl); font-weight: 600; margin-bottom: var(--space-6); max-width: 18ch; }
.accent-text { color: var(--color-primary); }
.hero-sub { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 56ch; margin-bottom: var(--space-8); font-family: var(--font-body); font-weight: 400; }
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-8); }
.hero-meta { display: flex; gap: var(--space-3); flex-wrap: wrap; font-size: var(--text-xs); color: var(--color-text-faint); font-weight: 600; }
.hero-meta .dot { opacity: 0.5; }

.scramble-line { display: inline-block; }

/* ---------- About / Philosophy ---------- */
.about-inner { max-width: var(--content-narrow); }
.lead { font-size: var(--text-lg); font-weight: 500; margin-bottom: var(--space-5); max-width: 60ch; }
.about-inner p:not(.lead) { color: var(--color-text-muted); max-width: 65ch; }

.philosophy-inner { max-width: var(--content-narrow); text-align: left; }
.philosophy-quote { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 500; line-height: 1.5; color: var(--color-text); padding: 0; margin-block: var(--space-2) var(--space-6); font-style: italic; }
.philosophy-note { font-size: var(--text-sm); color: var(--color-text-faint); }

/* ---------- Timeline ---------- */
.timeline { position: relative; display: flex; flex-direction: column; gap: var(--space-12); }
.timeline::before { content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px; background: var(--color-divider); }
@media (min-width: 700px) { .timeline::before { left: 9px; } }

.timeline-packet { position: absolute; left: 7px; top: 8px; width: 1px; height: 0; pointer-events: none; z-index: 2; }
@media (min-width: 700px) { .timeline-packet { left: 9px; } }
.packet-dot {
  position: absolute; bottom: -4px; left: 50%; transform: translateX(-50%);
  width: 8px; height: 8px; border-radius: var(--radius-full); background: var(--color-primary);
  box-shadow: 0 0 0 4px oklch(from var(--color-primary) l c h / 0.18), 0 0 12px oklch(from var(--color-primary) l c h / 0.6);
  opacity: 0; transition: opacity 0.3s ease;
}
.timeline-packet.visible .packet-dot { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .timeline-packet { display: none; } }

.timeline-item { position: relative; padding-left: var(--space-8); }
@media (min-width: 700px) { .timeline-item { padding-left: var(--space-10); } }
.timeline-marker { position: absolute; left: 0; top: 4px; width: 16px; height: 16px; border-radius: var(--radius-full); background: var(--color-surface); border: 1px solid var(--color-border); display: grid; place-items: center; }
@media (min-width: 700px) { .timeline-marker { width: 20px; height: 20px; } }
.timeline-marker span { width: 6px; height: 6px; border-radius: var(--radius-full); background: var(--color-primary); }
.timeline-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-3); margin-bottom: var(--space-1); }
.timeline-head h3 { font-size: var(--text-lg); font-weight: 600; }
.timeline-date { font-size: var(--text-xs); color: var(--color-text-faint); font-weight: 600; }
.timeline-org { color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: var(--space-4); }
.timeline-list { display: flex; flex-direction: column; gap: var(--space-2); padding-left: var(--space-5); }
.timeline-list li { font-size: var(--text-sm); color: var(--color-text-muted); position: relative; }
.timeline-list li::before { content: '\2013'; position: absolute; left: -20px; color: var(--color-text-faint); }

/* ---------- Case studies ---------- */
.case-grid { display: grid; gap: var(--space-6); }
@media (min-width: 800px) { .case-grid { grid-template-columns: 1fr 1fr; } }
.case-card { padding: var(--space-8); border-radius: var(--radius-xl); background: var(--color-surface); border: 1px solid var(--color-border); display: flex; flex-direction: column; }
.case-tag { font-size: var(--text-xs); font-weight: 600; color: var(--color-primary); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--space-4); }
.case-number { display: flex; align-items: baseline; gap: var(--space-1); margin-bottom: var(--space-1); }
.case-num, .case-suffix { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 700; color: var(--color-text); }
.case-metric-label { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-5); }
.case-body { display: flex; flex-direction: column; gap: var(--space-3); border-top: 1px solid var(--color-divider); padding-top: var(--space-5); }
.case-body p { font-size: var(--text-sm); color: var(--color-text-muted); }
.case-body strong { color: var(--color-text); font-weight: 600; }

/* ---------- Skills ---------- */
.skills-grid { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.skill-chip {
  padding: var(--space-2) var(--space-5); border-radius: var(--radius-full); background: var(--color-surface);
  border: 1px solid var(--color-border); font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted);
  cursor: default; transition: opacity var(--transition-interactive), border-color var(--transition-interactive), background var(--transition-interactive);
}
.skills-grid.connecting .skill-chip { opacity: 0.35; }
.skills-grid.connecting .skill-chip.chip-active, .skills-grid.connecting .skill-chip.chip-related { opacity: 1; }
.skill-chip.chip-active { border-color: var(--color-primary); background: var(--color-primary-highlight); color: var(--color-text); }
.skill-chip.chip-related { border-color: oklch(from var(--color-primary) l c h / 0.5); }

/* ---------- Certifications ---------- */
.cert-intro { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-10); max-width: 62ch; }
.cert-intro a { color: var(--color-primary); font-weight: 600; text-decoration: underline; text-decoration-color: oklch(from var(--color-primary) l c h / 0.4); text-underline-offset: 3px; }
.cert-intro a:hover { text-decoration-color: var(--color-primary); }

.badge-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); margin-bottom: var(--space-10); }
@media (min-width: 700px) { .badge-row { grid-template-columns: repeat(4, 1fr); } }

.badge-card {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--space-3);
  padding: var(--space-6) var(--space-4); border-radius: var(--radius-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.badge-card:hover { transform: translateY(-4px); border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.badge-card img { width: 72px; height: 72px; object-fit: contain; border-radius: var(--radius-md); }
.badge-icon-svg { color: var(--color-primary); display: grid; place-items: center; width: 72px; height: 72px; }
.badge-name { font-size: var(--text-sm); font-weight: 700; color: var(--color-text); }
.badge-date { font-size: var(--text-xs); color: var(--color-text-faint); font-weight: 600; }

.badge-secondary { margin-bottom: var(--space-12); }
.badge-secondary-label { display: block; font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-faint); margin-bottom: var(--space-4); }
.badge-chip-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.badge-chip {
  display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full); background: var(--color-surface); border: 1px solid var(--color-border);
  font-size: var(--text-xs); font-weight: 500; color: var(--color-text-muted);
}
.badge-chip svg { color: var(--color-primary); flex-shrink: 0; }
.badge-chip:hover { border-color: var(--color-primary); color: var(--color-text); background: var(--color-primary-highlight); }

.cert-grid-education { margin-top: 0; }
.cert-heading { font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-4); }
.cert-list { display: flex; flex-direction: column; gap: var(--space-4); }
.cert-list li { display: flex; justify-content: space-between; gap: var(--space-4); font-size: var(--text-sm); border-bottom: 1px solid var(--color-divider); padding-bottom: var(--space-4); }
.cert-list li:last-child { border-bottom: none; }
.cert-list time { color: var(--color-text-faint); font-size: var(--text-xs); font-weight: 600; white-space: nowrap; }
.muted { color: var(--color-text-muted); font-size: var(--text-xs); }

/* ---------- Contact ---------- */
.contact-inner { max-width: var(--content-narrow); }
.contact-lead { margin-bottom: var(--space-10); }
.contact-links { display: flex; flex-direction: column; gap: var(--space-3); }

.contact-link {
  display: flex; align-items: center; gap: var(--space-5);
  padding: var(--space-5) var(--space-6); border-radius: var(--radius-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  text-decoration: none !important;
  transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive), background var(--transition-interactive);
}
.contact-link:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); transform: translateX(4px); background: var(--color-surface-2); }

.contact-icon {
  display: grid; place-items: center; flex-shrink: 0; width: 42px; height: 42px;
  border-radius: var(--radius-md); background: var(--color-primary-highlight); color: var(--color-primary);
}

.contact-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.contact-label { font-size: var(--text-xs); color: var(--color-text-faint); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; text-decoration: none; }
.contact-value { font-weight: 600; color: var(--color-text); text-decoration: none !important; word-break: break-word; }

.contact-arrow { flex-shrink: 0; color: var(--color-text-faint); transition: transform var(--transition-interactive), color var(--transition-interactive); }
.contact-link:hover .contact-arrow { color: var(--color-primary); transform: translateX(3px); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-divider); padding-block: var(--space-10); }
.footer-inner { display: flex; flex-direction: column; gap: var(--space-6); align-items: center; text-align: center; }
.footer-brand { display: flex; align-items: center; gap: var(--space-2); font-weight: 600; color: var(--color-text-muted); }
.footer-brand svg { color: var(--color-primary); }
.footer-links { display: flex; gap: var(--space-3); }
.footer-links a {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: var(--radius-full);
  color: var(--color-text-muted); border: 1px solid var(--color-border); background: var(--color-surface);
}
.footer-links a:hover { color: var(--color-primary); border-color: var(--color-primary); background: var(--color-primary-highlight); }
.footer-bottom { display: flex; flex-direction: column; gap: var(--space-1); font-size: var(--text-xs); color: var(--color-text-faint); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s cubic-bezier(0.16,1,0.3,1), transform 0.6s cubic-bezier(0.16,1,0.3,1); }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Integration flow visual (hero) ---------- */
.flow-svg { width: 100%; max-width: 380px; height: auto; }
.flow-line { stroke: oklch(from var(--color-primary) l c h / 0.28); stroke-width: 1.4; }
.flow-pulse { fill: var(--color-primary); filter: drop-shadow(0 0 4px oklch(from var(--color-primary) l c h / 0.7)); }
.flow-hub { fill: var(--color-primary); opacity: 0.14; stroke: var(--color-primary); stroke-width: 1.6; }
.flow-hub-label { font-family: var(--font-body); font-weight: 700; font-size: 11px; fill: var(--color-primary); }
.flow-node circle { fill: var(--color-surface); stroke: var(--color-border); stroke-width: 1.4; }
.flow-node text { font-family: var(--font-body); font-size: 9.5px; font-weight: 600; fill: var(--color-text-muted); }
@media (prefers-reduced-motion: reduce) { .flow-pulse { display: none; } }

/* ---------- Custom cursor ---------- */
.custom-cursor {
  position: fixed; top: 0; left: 0; width: 20px; height: 20px; border: 1.4px solid var(--color-primary);
  border-radius: var(--radius-full); pointer-events: none; z-index: 999; transform: translate(-50%, -50%);
  transition: width 0.2s ease, height 0.2s ease, background 0.2s ease, opacity 0.2s ease; mix-blend-mode: difference; opacity: 0;
}
.custom-cursor.active { opacity: 1; }
.custom-cursor.hover { width: 40px; height: 40px; background: oklch(from var(--color-primary) l c h / 0.15); }
@media (hover: none), (pointer: coarse) { .custom-cursor { display: none; } }