/* ============================================
   BEVERLY XU PORTFOLIO — DESIGN SYSTEM
   Retro desktop · Nature · Tech · Puns
   ============================================ */

/* @import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Serif+Display:ital@0;1&family=IBM+Plex+Mono:wght@400;500;600&display=swap'); */

:root {
  /* Tricolor palette */
  --lavender:     #C8C8E9;
  --sage:         #D8E8C3;
  --cream:        #E8E8CC;

  /* Derived shades */
  --lavender-dark:  #9898C9;
  --lavender-deep:  #5a5a9e;
  --sage-dark:      #9abf7e;
  --sage-deep:      #4a7a38;
  --cream-dark:     #c8c88a;
  --ink:            #1a1a2e;
  --ink-soft:       #2e2e4e;
  --white:          #fafaf6;
  --off-white:      #f4f4ec;
  --true-white:     #ffffff;

  /* Typography */
  --font-display:  'DM Serif Display', Georgia, serif;
  /* --font-ui:       'Syne', sans-serif; */
  --font-ui:        'dolly-new', sans-serif;
  --font-mono:     'IBM Plex Mono', monospace;

  /* Spacing scale */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  2rem;
  --space-xl:  4rem;
  --space-2xl: 8rem;

  /* Motion */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm:  2px 3px 0px var(--ink);
  --shadow-md:  4px 6px 0px var(--ink);
  --shadow-lg:  6px 10px 0px var(--ink);
  --shadow-xl:  8px 14px 0px var(--ink);

  /* Border */
  --border: 2px solid var(--ink);
  --border-thick: 3px solid var(--ink);
  --sidebar-width: 240px;
}

/* ---- DARK MODE ---- */
body.dark {
  --ink:       #e8e8f0;
  --ink-soft:  #c0c0d8;
  --white:     #12121e;
  --off-white: #1a1a2e;
  --lavender:  #3a3a6e;
  --sage:      #2a4a1e;
  --cream:     #3e3e28;
  --lavender-dark: #5858a0;
  --shadow-sm:  2px 3px 0px #e8e8f055;
  --shadow-md:  4px 6px 0px #e8e8f055;
  --shadow-lg:  6px 10px 0px #e8e8f055;
  --shadow-xl:  8px 14px 0px #e8e8f055;
  --border: 2px solid var(--ink);
}

/* ---- RESET & BASE ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-ui);
  background: var(--off-white);
  color: var(--ink);
  cursor: none;
  overflow-x: hidden;
  transition: background 0.4s var(--ease-smooth), color 0.4s var(--ease-smooth);
  padding-left: var(--sidebar-width);
}

/* ---- CUSTOM CURSOR ---- */
.cursor {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
}
.cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--ink);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: transform 0.1s var(--ease-spring);
}
.cursor-ring {
  width: 32px;
  height: 32px;
  border: var(--border);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: transform 0.25s var(--ease-out), width 0.2s var(--ease-spring), height 0.2s var(--ease-spring);
}
body.cursor-hover .cursor-ring {
  width: 56px;
  height: 56px;
}
body.cursor-hover .cursor-dot {
  transform: translate(-50%, -50%) scale(0);
}

/* ============ NAVIGATION ============ */
#navbar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-md);
  padding: calc(var(--space-xl)) var(--space-md);
  border-radius: 0;
  overflow-y: auto;
}

#navbar.scrolled {
  /* no-op for sidebar layout */
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: var(--space-xs);
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--sage-deep);
  text-decoration: none;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 2px 0;
  position: relative;
  transition: color 0.2s;
}

.nav-links a::before {
  content: '//';
  font-family: var(--font-mono);
  opacity: 0;
  color: var(--lavender-deep);
  transition: opacity 0.2s;
}

.nav-links a:hover::before,
.nav-links a.active::before {
  opacity: 1;
}

.nav-links a.active {
  color: var(--lavender-deep);
  font-weight: 600;
}

/* Make internal nav links match external link behavior */
.nav-links a:hover { color: var(--lavender-deep); }
.nav-links a:active { color: var(--lavender-dark); }

/* Ext links row */
.nav-ext {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
  border-top: 1px solid var(--ink);
  padding-top: var(--space-sm);
}

.nav-ext a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-ext a:hover { color: var(--sage-deep); }

/* Make external links match internal nav link colors */
/* Targets external anchors (blank-target, rel="external", or absolute http(s) links) */
a[target="_blank"], a[rel~="external"], a[href^="http"] {
  color: var(--sage-deep);
  text-decoration: none;
  transition: color 0.2s;
}
a[target="_blank"]:hover, a[rel~="external"]:hover, a[href^="http"]:hover {
  color: var(--lavender-deep);
}
a[target="_blank"]:active, a[rel~="external"]:active, a[href^="http"]:active {
  color: var(--lavender-dark);
}

/* Dark mode toggle */
.dark-toggle {
  margin-top: var(--space-xs);
  background: none;
  border: var(--border);
  border-radius: 0;
  cursor: none;
  padding: 4px var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink);
  background: var(--cream);
  transition: background 0.2s, box-shadow 0.2s;
}

/* Responsive: revert to top-left floating nav on small screens */
@media (max-width: 900px) {
  body { padding-left: 0; }
  #navbar {
    left: var(--space-lg);
    top: var(--space-lg);
    bottom: auto;
    width: auto;
    padding: var(--space-md) var(--space-lg);
    border-radius: 0;
  }
}
.dark-toggle:hover {
  background: var(--lavender);
  box-shadow: var(--shadow-sm);
}

/* ============ LOADING SCREEN ============ */
#loader {
  position: fixed;
  inset: 0;
  background: var(--off-white);
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
}
#loader.hide {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-20px);
}
.loader-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
}
.loader-bar {
  width: 200px;
  height: 4px;
  background: var(--lavender);
  border: var(--border);
  position: relative;
  overflow: hidden;
}
.loader-bar::after {
  content: '';
  position: absolute;
  left: -100%;
  top: 0; bottom: 0;
  width: 100%;
  background: var(--ink);
  animation: loadbar 1.2s var(--ease-smooth) forwards;
}
@keyframes loadbar {
  to { left: 0; }
}
.loader-leaf {
  font-size: 2rem;
  animation: spin 2s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============ PAGE SECTIONS ============ */
section {
  min-height: 100vh;
  padding: var(--space-2xl) var(--space-xl) var(--space-xl) 14rem;
  position: relative;
}

/* ============ HERO / MAIN ============ */
#home {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--off-white);
  overflow: hidden;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sage-deep);
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out) 0.3s forwards;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 8rem);
  line-height: 0.95;
  color: var(--ink);
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.5s forwards;
}

.hero-name em {
  font-style: italic;
  color: var(--lavender-deep);
}

.hero-tagline {
  font-family: var(--font-ui);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  max-width: 540px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.7s forwards;
}

.hero-tldr {
  display: inline-flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.9s forwards;
}

.tag-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 12px;
  border: var(--border);
  background: var(--lavender);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s var(--ease-spring), box-shadow 0.15s;
  letter-spacing: 0.05em;
}
.tag-pill:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-md);
}
.tag-pill.sage   { background: var(--sage); }
.tag-pill.cream  { background: var(--cream); }

/* Hero image + floating icons */
.hero-right {
  position: absolute;
  right: calc(2*var(--space-xl));
  top: 50%;
  transform: translateY(-50%);
  width: 340px;
  opacity: 0;
  animation: fadeIn 0.5s var(--ease-out) 0.5s forwards;
  z-index: 2;
}

/* Hero image + floating icons */
.hero-left {
  position: absolute;
  left: var(--space-xl);
  top: 50%;
  transform: translateY(-50%);
  width: 340px;
  opacity: 0;
  animation: fadeIn 0.5s var(--ease-out) 0.5s forwards;
  z-index: 2;
}

.hero-portrait {
  width: 280px;
  height: 340px;
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  background: var(--lavender);
  overflow: visible;
  position: relative;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 42% 58% 54% 46% / 48% 42% 58% 52%;
  /* padding-right: var(--space-xl); */
}

.portrait {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--lavender-deep);
  text-align: center;
  padding: var(--space-md);
  opacity: 0.9;
  width: 100%;
  height: 100%;
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Floating skill icons around portrait */
.float-icon {
  position: absolute;
  width: 44px;
  height: 44px;
  border: var(--border);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  animation: floatBob var(--dur, 3s) var(--delay, 0s) ease-in-out infinite alternate;
  z-index: 3;
}
@keyframes floatBob {
  from { transform: translateY(0) rotate(0deg); }
  to   { transform: translateY(-10px) rotate(4deg); }
}

.fi-1 { top: 10px;  left: -30px;  --dur:3.2s; --delay:0s; }
.fi-2 { top: 90px;  left: -50px;  --dur:2.8s; --delay:0.4s; }
.fi-3 { bottom: 60px; left: -35px; --dur:3.5s; --delay:0.8s; }
.fi-4 { top: 10px;  right: -30px; --dur:3.1s; --delay:0.2s; }
.fi-5 { top: 90px;  right: -50px; --dur:2.9s; --delay:0.6s; }
.fi-6 { bottom: 60px; right: -35px; --dur:3.4s; --delay:1s; }

/* Tooltip on float icons */
.float-icon[data-tip] {
  position: absolute;
}
.float-icon[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 8px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  border: 1px solid var(--white);
}
.float-icon[data-tip]:hover::after { opacity: 1; }

/* ============ ABOUT ============ */
#about {
  background: var(--lavender);
  border-top: var(--border-thick);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
  max-width: 1000px;
}

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

.about-photo {
  width: 100%;
  aspect-ratio: 3/4;
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  background: var(--cream);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-photo-overlay {
  position: absolute;
  inset: 0;
  background: var(--lavender-deep);
  opacity: 0;
  transition: opacity 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-style: italic;
  padding: var(--space-lg);
  text-align: center;
}
.about-photo:hover .about-photo-overlay { opacity: 0.85; }

.about-content {}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.section-label::before {
  content: '❧';
  color: var(--sage-deep);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1;
  margin-bottom: var(--space-lg);
}

.about-body {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 480px;
}

.about-body p + p { margin-top: var(--space-md); }

.about-fun-facts {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.fun-fact {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: var(--space-sm);
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  border: var(--border);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
  transition: transform 0.15s var(--ease-spring), box-shadow 0.15s;
}
.fun-fact:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-md);
}
.fun-fact-icon { font-size: 1.2rem; }

/* ============ PROJECTS ============ */
#projects {
  background: var(--cream);
  border-top: var(--border-thick);
}

/* Orbiting leaf */
.leaf-orbit-wrap {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  pointer-events: none;
  z-index: 5;
}

.leaf-orbit {
  position: absolute;
  font-size: 1.8rem;
  transform-origin: 0 0;
  transition: none;
  filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.2));
}

.leaf-trail {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sage-dark);
  pointer-events: none;
  z-index: 4;
  opacity: 0;
  transition: opacity 0.5s;
}

/* Projects desktop-icon grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  max-width: 1000px;
}

.project-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  cursor: none;
  padding: var(--space-md);
  border: 2px solid transparent;
  transition: border-color 0.2s, background 0.2s;
}
.project-icon:hover {
  border-color: var(--ink);
  background: rgba(255,255,255,0.5);
}

.project-icon-img {
  width: 80px;
  height: 80px;
  border: var(--border);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  transition: transform 0.15s var(--ease-spring), box-shadow 0.15s;
  position: relative;
}

.project-icon:hover .project-icon-img {
  transform: scale(1.12);
  box-shadow: var(--shadow-lg);
}

.project-icon-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-align: center;
  max-width: 120px;
  line-height: 1.3;
}

/* Page indicator dots */
.page-indicator {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}
.page-dot {
  width: 10px;
  height: 10px;
  border: var(--border);
  background: transparent;
  border-radius: 50%;
  cursor: none;
  transition: background 0.2s, transform 0.2s var(--ease-spring);
}
.page-dot.active {
  background: var(--ink);
  transform: scale(1.3);
}

/* Project Modal / Overlay */
.project-modal-bg {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.7);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(4px);
  transition: opacity 0.3s var(--ease-smooth);
}
.project-modal-bg.open {
  opacity: 1;
  pointer-events: all;
}

.project-modal {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  width: min(780px, 90vw);
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.35s var(--ease-spring);
}
.project-modal-bg.open .project-modal {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--cream);
  border: var(--border);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1rem;
  cursor: none;
  transition: background 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow-sm);
}
.modal-close:hover {
  background: var(--lavender);
  box-shadow: var(--shadow-md);
}

.modal-inner {
  padding: var(--space-xl);
}

.modal-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: var(--border);
}

.modal-emoji {
  font-size: 3rem;
  line-height: 1;
  flex-shrink: 0;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.1;
  margin-bottom: var(--space-xs);
}

.modal-dates {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.modal-desc {
  line-height: 1.75;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.modal-skills {
  margin-top: var(--space-lg);
}
.modal-skills-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  color: var(--ink-soft);
}

/* ============ RESEARCH ============ */
#research {
  background: var(--sage);
  border-top: var(--border-thick);
}

.research-item {
  border: var(--border);
  background: var(--white);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-lg);
  max-width: 820px;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s;
}
.research-item:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

.research-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--ink);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  cursor: none;
}

.research-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1.2;
}
.research-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  white-space: nowrap;
  margin-top: var(--space-xs);
}

.research-expand-btn {
  background: var(--lavender);
  border: var(--border);
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  cursor: none;
  transition: background 0.15s, transform 0.2s var(--ease-spring);
}
.research-item.expanded .research-expand-btn {
  transform: rotate(45deg);
}

.research-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease-smooth), padding 0.3s;
}
.research-item.expanded .research-body {
  max-height: 600px;
  padding: var(--space-lg);
}

.research-subsection {
  margin-bottom: var(--space-md);
}
.research-sub-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--sage-deep);
  margin-bottom: var(--space-xs);
}
.research-sub-content {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ============ 404 PAGE ============ */
.page-404 {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--off-white);
  padding: var(--space-xl);
  text-align: center;
}

.err-code {
  font-family: var(--font-display);
  font-size: clamp(5rem, 20vw, 14rem);
  line-height: 1;
  color: var(--lavender);
  -webkit-text-stroke: 2px var(--ink);
  animation: wiggle 3s ease-in-out infinite;
}
@keyframes wiggle {
  0%,100% { transform: rotate(-2deg); }
  50%      { transform: rotate(2deg); }
}

.err-message {
  font-family: var(--font-display);
  font-size: 2rem;
  font-style: italic;
  margin-bottom: var(--space-md);
}

.err-sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: var(--space-xl);
}

.btn-home {
  display: inline-block;
  padding: var(--space-sm) var(--space-xl);
  border: var(--border-thick);
  background: var(--sage);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: transform 0.15s var(--ease-spring), box-shadow 0.15s;
}
.btn-home:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

/* ============ WIFI DISCONNECT TOAST ============ */
#wifi-toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 5000;
  background: var(--true-white);
  border: var(--border-thick);
  box-shadow: var(--shadow-lg);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  max-width: 320px;
  transform: translateX(150%);
  transition: transform 0.4s var(--ease-spring);
}
#wifi-toast.show {
  transform: translateX(0);
}

.wifi-anim {
  font-size: 1.5rem;
  animation: wifiSwipe 1.2s ease-in-out infinite;
}
@keyframes wifiSwipe {
  0%, 100% { transform: translateX(0); opacity: 1; }
  40%       { transform: translateX(14px); opacity: 0; }
  41%       { transform: translateX(-14px); opacity: 0; }
  80%       { transform: translateX(0); opacity: 1; }
}

.wifi-text strong {
  display: block;
  font-size: 0.9rem;
  color: var(--ink);
}
.wifi-text span {
  color: var(--ink-soft);
}

/* ============ ANIMATIONS & UTILITIES ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.scroll-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.scroll-reveal.visible {
  opacity: 1;
  transform: none;
}

/* Stagger delays for children */
.stagger > * { transition-delay: calc(var(--i, 0) * 0.1s); }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  section { padding-left: 3rem; }
  #navbar { 
    flex-direction: row;
    flex-wrap: wrap;
    left: 0; right: 0;
    top: 0;
    border-left: none;
    border-right: none;
    border-top: none;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-md);
  }
  /* Keep links vertical on tablet sizes so they don't form a horizontal line */
  .nav-links { flex-direction: column; }
  .hero-right { display: none; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  section { padding: 5rem var(--space-md) var(--space-xl); }
  .projects-grid { grid-template-columns: repeat(3, 1fr); }
}