/* ============================================================
   ERMALD BILLA PORTFOLIO — styles.css
   Design: Technical Editorial — Dark terminal × luxury type
   Fonts: Syne (display) + Instrument Sans (body) + JetBrains Mono (code)
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────────── */
:root {
  /* Colors — Dark default */
  --bg:           #0A0A0F;
  --bg-surface:   #11111A;
  --bg-elevated:  #1A1A28;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(0,245,160,0.3);

  --text:         #F0EEE8;
  --text-muted:   #8A8A9A;
  --text-subtle:  #4A4A5A;

  --accent:       #00F5A0;
  --accent-dim:   rgba(0,245,160,0.12);
  --accent-glow:  rgba(0,245,160,0.25);
  --amber:        #FFB800;
  --amber-dim:    rgba(255,184,0,0.12);
  --coral:        #FF6B6B;
  --violet:       #A78BFA;
  --cyan:         #00C9FF;

  /* Typography */
  --font-display: 'Syne', 'Georgia', serif;
  --font-body:    'Instrument Sans', 'Helvetica Neue', sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Scale — fluid with clamp() */
  --text-xs:   clamp(0.65rem, 1.5vw, 0.75rem);
  --text-sm:   clamp(0.8rem,  1.8vw, 0.875rem);
  --text-base: clamp(0.9rem,  2vw,   1rem);
  --text-lg:   clamp(1rem,    2.2vw, 1.125rem);
  --text-xl:   clamp(1.1rem,  2.5vw, 1.25rem);
  --text-2xl:  clamp(1.3rem,  3vw,   1.5rem);
  --text-3xl:  clamp(1.6rem,  4vw,   2rem);
  --text-4xl:  clamp(2rem,    5vw,   2.8rem);
  --text-hero: clamp(2.8rem,  8vw,   5.5rem);

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-24:  6rem;
  --space-32:  8rem;

  /* Radii */
  --r-sm:  4px;
  --r-md:  8px;
  --r-lg:  16px;
  --r-xl:  24px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:    0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:    0 8px 32px rgba(0,0,0,0.6);
  --shadow-accent:0 0 40px rgba(0,245,160,0.15);
  --shadow-card:  0 2px 8px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.04);

  /* Component-specific tokens (all adapt in light mode) */
  --nav-bg:          rgba(10,10,15,0.0);
  --nav-bg-scroll:   rgba(10,10,15,0.85);
  --overlay-bg:      rgba(10,10,15,0.95);
  --modal-bg:        rgba(10,10,15,0.98);
  --btn-ghost-bg:    rgba(255,255,255,0.06);
  --btn-ghost-hover: rgba(255,255,255,0.10);
  --grid-line:       rgba(0,245,160,0.04);
  --blob-1:          rgba(0,245,160,0.10);
  --blob-2:          rgba(0,201,255,0.07);
  --body-gradient:   rgba(0,245,160,0.03);
  --badge-border:    rgba(0,245,160,0.2);
  --card-flip-shadow:0 20px 60px var(--card-flip-shadow);

  /* Transitions */
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:   cubic-bezier(0.4, 0, 1, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --max-w: 1200px;
  --nav-h: 64px;
}

/* ── LIGHT MODE ──────────────────────────────────────────────── */
[data-theme="light"] {
  --bg:           #F5F4EF;
  --bg-surface:   #FFFFFF;
  --bg-elevated:  #ECEAE3;
  --border:       rgba(0,0,0,0.10);
  --border-hover: rgba(0,150,80,0.35);

  --text:         #18181F;
  --text-muted:   #4A4A5E;
  --text-subtle:  #888899;

  --accent:       #007A40;
  --accent-dim:   rgba(0,122,64,0.09);
  --accent-glow:  rgba(0,122,64,0.18);
  --amber:        #B86E00;
  --amber-dim:    rgba(184,110,0,0.10);
  --coral:        #C0392B;
  --violet:       #6D3FC0;
  --cyan:         #0077A8;

  --shadow-sm:    0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:    0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg:    0 8px 32px rgba(0,0,0,0.12);
  --shadow-accent:0 0 40px rgba(0,122,64,0.10);
  --shadow-card:  0 2px 12px rgba(0,0,0,0.08), 0 0 0 1px rgba(0,0,0,0.06);

  /* Component tokens */
  --nav-bg:          rgba(245,244,239,0.0);
  --nav-bg-scroll:   rgba(245,244,239,0.92);
  --overlay-bg:      rgba(245,244,239,0.97);
  --modal-bg:        rgba(255,255,255,0.99);
  --btn-ghost-bg:    rgba(0,0,0,0.05);
  --btn-ghost-hover: rgba(0,0,0,0.08);
  --grid-line:       rgba(0,122,64,0.05);
  --blob-1:          rgba(0,122,64,0.06);
  --blob-2:          rgba(0,119,168,0.05);
  --body-gradient:   rgba(0,122,64,0.02);
  --badge-border:    rgba(0,122,64,0.2);
  --card-flip-shadow:0 20px 60px rgba(0,0,0,0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dim) transparent;
}

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  transition: background 0.3s var(--ease-out), color 0.3s var(--ease-out);
  overflow-x: hidden;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul, ol { list-style: none; }

/* ── SKIP LINK ───────────────────────────────────────────────── */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-6);
  background: var(--accent);
  color: #000;
  font-weight: 700;
  border-radius: var(--r-md);
  transition: top 0.2s;
}
.skip-link:focus { top: var(--space-4); }

/* ── FOCUS VISIBLE ───────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ── GRID NOISE BACKGROUND ───────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, var(--body-gradient) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, var(--body-gradient) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ── TYPOGRAPHY ──────────────────────────────────────────────── */
h1,h2,h3,h4,h5 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.section-label::before {
  content: '//';
  opacity: 0.5;
}

/* ── LAYOUT ──────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

section {
  position: relative;
  z-index: 1;
}

/* ── NAVIGATION ──────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
}
.nav.scrolled {
  background: var(--nav-bg-scroll);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border);
}


.nav__inner {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.nav__logo svg {
  width: 56px;
  height: 28px;
}
.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-muted);
  display: none;
}
@media (min-width: 480px) {
  .nav__logo-text { display: block; }
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .nav__links { display: flex; }
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s var(--ease-out);
}
.nav__link:hover, .nav__link.active {
  color: var(--text);
}
.nav__link:hover::after, .nav__link.active::after {
  transform: scaleX(1);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__search-btn,
.nav__theme-btn,
.nav__lang-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
  font-size: var(--text-sm);
}
.nav__search-btn:hover,
.nav__theme-btn:hover,
.nav__lang-btn:hover {
  color: var(--text);
  background: var(--bg-surface);
}

.nav__lang-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  width: auto;
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
}
.nav__lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.nav__hamburger {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}
.nav__hamburger:hover { color: var(--text); background: var(--bg-surface); }
@media (min-width: 768px) { .nav__hamburger { display: none; } }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  transform: translateX(100%);
  transition: transform 0.4s var(--ease-out);
}
.mobile-menu.open {
  transform: translateX(0);
}
.mobile-menu__link {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--text);
  transition: color 0.2s;
}
.mobile-menu__link:hover { color: var(--accent); }
.mobile-menu__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-6);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.5rem;
}

/* ── SEARCH OVERLAY ──────────────────────────────────────────── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--overlay-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: calc(var(--nav-h) + var(--space-16));
  padding-inline: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.search-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.search-overlay__input-wrap {
  width: 100%;
  max-width: 600px;
  position: relative;
}
.search-overlay__input {
  width: 100%;
  padding: var(--space-4) var(--space-6) var(--space-4) 3.5rem;
  font-family: var(--font-body);
  font-size: var(--text-xl);
  background: var(--bg-surface);
  border: 2px solid var(--border);
  border-radius: var(--r-lg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.search-overlay__input:focus { border-color: var(--accent); }
.search-overlay__input::placeholder { color: var(--text-muted); }
.search-overlay__icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.search-overlay__close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: var(--text-muted);
  font-size: 1.5rem;
  padding: var(--space-2);
}
.search-results {
  width: 100%;
  max-width: 600px;
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.search-result-item {
  padding: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  text-align: left;
  width: 100%;
}
.search-result-item:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
}
.search-result-item__title {
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-1);
}
.search-result-item__desc { color: var(--text-muted); font-size: var(--text-sm); }
.search-no-results {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  margin-top: var(--space-6);
}

/* ── HERO ────────────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: var(--nav-h);
  padding-bottom: var(--space-16);
  position: relative;
  overflow: hidden;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
  pointer-events: none;
}

.hero__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.hero__blob--1 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--blob-1), transparent 70%);
  top: 10%; right: -10%;
  animation: float1 8s ease-in-out infinite;
}
.hero__blob--2 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, var(--blob-2), transparent 70%);
  bottom: 20%; left: -5%;
  animation: float2 10s ease-in-out infinite;
}

@keyframes float1 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-20px,20px) scale(1.05); }
}
@keyframes float2 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(20px,-15px) scale(0.95); }
}

.hero__container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-6);
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--accent-dim);
  border: 1px solid var(--badge-border);
  border-radius: var(--r-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent);
  margin-bottom: var(--space-6);
  letter-spacing: 0.05em;
}
.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.hero__name {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}

.hero__name span {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--text-muted);
  max-width: 520px;
  line-height: 1.6;
  margin-bottom: var(--space-8);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--r-md);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: all 0.2s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--btn-ghost-bg);
  opacity: 0;
  transition: opacity 0.2s;
}
.btn:hover::before { opacity: 1; }

.btn--primary {
  background: var(--accent);
  color: #000;
  font-weight: 700;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn--outline {
  border: 1.5px solid var(--border);
  color: var(--text);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  right: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}
@keyframes scroll-line {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ── ABOUT ───────────────────────────────────────────────────── */
.about {
  padding: var(--space-32) 0;
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: start;
}
@media (min-width: 900px) {
  .about__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }
}

.about__heading {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-6);
}

.about__text {
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  font-size: var(--text-base);
}

.about__text strong {
  color: var(--text);
  font-weight: 600;
}

.about__facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.fact-card {
  padding: var(--space-6);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color 0.2s, transform 0.2s;
}
.fact-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.fact-card__number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.fact-card__label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ── SKILLS ──────────────────────────────────────────────────── */
.skills {
  padding: var(--space-24) 0;
}

.skills__heading {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-12);
}

.skills__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) {
  .skills__grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .skills__grid { grid-template-columns: repeat(5, 1fr); }
}

.skill-category {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--space-6);
  transition: border-color 0.2s, transform 0.2s;
}
.skill-category:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}
.skill-category__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.skill-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin: var(--space-1) var(--space-1) 0 0;
  transition: color 0.2s, border-color 0.2s;
}
.skill-tag:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* ── PROJECTS ────────────────────────────────────────────────── */
.projects {
  padding: var(--space-24) 0;
}

.projects__header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.projects__heading {
  font-size: var(--text-4xl);
}

.projects__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--r-full);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.filter-btn:hover,
.filter-btn.active {
  color: #000;
  background: var(--accent);
  border-color: var(--accent);
}

.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 640px) {
  .projects__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .projects__grid { grid-template-columns: repeat(3, 1fr); }
}

/* ── PROJECT CARD 3D FLIP ────────────────────────────────────── */
.project-card {
  height: 280px;
  perspective: 1200px;
  cursor: pointer;
}
@media (min-width: 768px) {
  .project-card { height: 320px; }
}

.project-card[hidden] {
  display: none;
}

.project-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s var(--ease-out);
  will-change: transform;
}

.project-card.flipped .project-card__inner {
  transform: rotateY(180deg);
}

.project-card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--r-lg);
  overflow: hidden;
}

.project-card__front {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s;
}
.project-card:hover .project-card__front {
  border-color: var(--border-hover);
}

.project-card__back {
  background: var(--bg-elevated);
  border: 1px solid var(--accent-dim);
  box-shadow: var(--shadow-card), var(--shadow-accent);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: rotateY(180deg);
}

.card-icon {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: var(--space-4);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.card-year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-subtle);
}
.card-category-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--card-color, var(--accent));
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-2);
  line-height: 1.2;
}

.card-short {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-4);
}
.card-tag {
  padding: var(--space-1) var(--space-2);
  background: var(--bg-elevated);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.card-hint {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

/* Back face */
.card-back-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--card-color, var(--accent));
  margin-bottom: var(--space-3);
}

.card-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

.card-highlight {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--accent-dim);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.card-links {
  display: flex;
  gap: var(--space-3);
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--r-sm);
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-mono);
  border: 1px solid var(--card-color, var(--accent));
  color: var(--card-color, var(--accent));
  transition: all 0.2s;
}
.card-link:hover {
  background: var(--card-color, var(--accent));
  color: #000;
}

/* ── MODAL (mobile fallback for flip) ────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--modal-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-end;
  padding: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.modal {
  width: 100%;
  max-width: 560px;
  margin-inline: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl) var(--r-xl) var(--r-lg) var(--r-lg);
  padding: var(--space-8);
  transform: translateY(40px);
  transition: transform 0.3s var(--ease-out);
  max-height: 80vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.modal-overlay.open .modal {
  transform: translateY(0);
}
.modal__handle {
  width: 40px;
  height: 4px;
  background: var(--border);
  border-radius: var(--r-full);
  margin: 0 auto var(--space-6);
}
.modal__icon { font-size: 3rem; margin-bottom: var(--space-4); }
.modal__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
}
.modal__desc {
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  line-height: 1.7;
}
.modal__close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  border-radius: var(--r-sm);
}
.modal__close:hover { color: var(--text); background: var(--bg-elevated); }
.modal { position: relative; }

/* ── CONTACT ─────────────────────────────────────────────────── */
.contact {
  padding: var(--space-24) 0 var(--space-32);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}
@media (min-width: 768px) {
  .contact__inner {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.contact__heading {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.contact__subtitle {
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: 1.6;
  max-width: 420px;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: all 0.2s;
}
.contact-link:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}
.contact-link__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-link__text { flex: 1; }
.contact-link__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}
.contact-link__value {
  font-weight: 600;
  color: var(--text);
}
.contact-link__arrow {
  color: var(--text-subtle);
  transition: transform 0.2s, color 0.2s;
}
.contact-link:hover .contact-link__arrow {
  transform: translateX(3px);
  color: var(--accent);
}

.copy-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-subtle);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  transition: all 0.2s;
  flex-shrink: 0;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.copy-btn.copied {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

/* ── FOOTER ──────────────────────────────────────────────────── */
footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.footer__copy span {
  color: var(--accent);
}
.footer__lighthouse {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-subtle);
}
.lh-badge {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: conic-gradient(#0CCE6B 0% 100%);
  position: relative;
}
.lh-badge::after {
  content: '100';
  position: absolute;
  inset: 2px;
  background: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5px;
  font-weight: 700;
  color: #0CCE6B;
}

/* ── EASTER EGG MODAL ────────────────────────────────────────── */
.easter-egg-modal {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--modal-bg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.easter-egg-modal.open {
  opacity: 1;
  pointer-events: all;
}
.easter-egg-box {
  background: var(--bg-surface);
  border: 2px solid var(--amber);
  border-radius: var(--r-xl);
  padding: var(--space-12);
  max-width: 400px;
  text-align: center;
  transform: scale(0.8);
  transition: transform 0.4s var(--ease-spring);
  box-shadow: 0 0 80px rgba(255,184,0,0.2);
}
.easter-egg-modal.open .easter-egg-box {
  transform: scale(1);
}
.easter-egg-emoji { font-size: 4rem; margin-bottom: var(--space-4); }
.easter-egg-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--amber);
  margin-bottom: var(--space-4);
}
.easter-egg-text {
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}
.konami-sequence {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
.konami-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--amber);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--amber);
}

/* ── SCROLL ANIMATIONS ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── HEADING COPY LINK ───────────────────────────────────────── */
.heading-anchor {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.copy-heading-btn {
  opacity: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--r-sm);
  color: var(--text-subtle);
  font-size: 0.75rem;
  border: 1px solid transparent;
  transition: all 0.2s;
  vertical-align: middle;
}
h2:hover .copy-heading-btn,
h3:hover .copy-heading-btn,
.heading-anchor:hover .copy-heading-btn {
  opacity: 1;
}
.copy-heading-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

/* ── SECTION DIVIDER ─────────────────────────────────────────── */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

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

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: var(--font-mono); }

/* ── PRINT ───────────────────────────────────────────────────── */
@media print {
  .nav, .hero__scroll, .nav__actions { display: none; }
  body { background: white; color: black; }
}

/* ── REDUCED MOTION ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ── LIGHT MODE COMPONENT OVERRIDES ─────────────────────────── */

/* Nav logo text color */
[data-theme="light"] .nav__logo-text { color: var(--text-muted); }

/* Ensure project card front/back use surface colors */
[data-theme="light"] .project-card__front,
[data-theme="light"] .project-card__back {
  background: var(--bg-surface);
  border-color: var(--border);
}

/* Skill tags */
[data-theme="light"] .skill-tag {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
}

/* Mobile menu overlay */
[data-theme="light"] .mobile-menu {
  background: var(--bg-surface);
  color: var(--text);
}

/* Fact cards */
[data-theme="light"] .fact-card {
  background: var(--bg-surface);
  border-color: var(--border);
}

/* Contact links */
[data-theme="light"] .contact-link {
  background: var(--bg-surface);
  border-color: var(--border);
}

/* Filter buttons */
[data-theme="light"] .filter-btn {
  background: var(--bg-surface);
  color: var(--text-muted);
  border-color: var(--border);
}
[data-theme="light"] .filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Section label (// 01 etc) */
[data-theme="light"] .section-label { opacity: 0.9; }

/* Hero badge */
[data-theme="light"] .hero__badge {
  background: var(--bg-surface);
  color: var(--text-muted);
}

/* Code / mono blocks */
[data-theme="light"] code,
[data-theme="light"] .font-mono,
[data-theme="light"] .card-tag {
  background: var(--bg-elevated);
  color: var(--text);
}

/* Card hint text */
[data-theme="light"] .card-hint { color: var(--text-subtle); }

/* CS breadcrumb */
[data-theme="light"] .cs-breadcrumb a { color: var(--text-muted); }
[data-theme="light"] .cs-toc__list a { color: var(--text-muted); }
[data-theme="light"] .cs-toc__list a.active,
[data-theme="light"] .cs-toc__list a:hover { color: var(--text); }

/* Prose text in light mode — slightly softer than pure black */
[data-theme="light"] .cs-prose p { color: var(--text-muted); }
[data-theme="light"] .cs-prose h2 { color: var(--text); }

/* ── LIGHTHOUSE / WCAG FIXES ─────────────────────────────────── */

/* Minimum 44×44px touch targets for all interactive elements */
.nav__search-btn,
.nav__theme-btn,
.nav__lang-btn,
.nav__hamburger,
.filter-btn,
.copy-btn,
.modal__close,
.search-overlay__close,
.mobile-menu__close {
  min-width:  44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Ensure links in nav also have enough hit area */
.nav__link {
  padding-block: 0.6rem;
  display: inline-flex;
  align-items: center;
}

/* Prevent icon SVGs from causing layout shift */
svg[width][height] { display: inline-block; flex-shrink: 0; vertical-align: middle; }

/* High-contrast focus ring — visible in both themes */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* Reduced motion */
@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;
  }
}