/* ==========================================================================
   std::N — global stylesheet
   원본 style.css 의 느낌은 최대한 유지하되, 디자인 토큰으로 토큰화하고
   시맨틱/접근성/반응형 버그를 수정했습니다.
   ========================================================================== */

:root {
  /* ─ palette ─────────────────────────────────────────────────── */
  --color-bg: #080808;
  --color-bg-elev: #101010;
  --color-fg: #e0f7fa;
  --color-fg-dim: #909090;
  --color-accent: #c1ff00;
  --color-blue: #0062ff;
  --color-pink: #ff003c;
  --color-midnight: #5b6e96;
  --color-garnet: #5a4b8a;

  /* ─ fonts ───────────────────────────────────────────────────── */
  --font-sans: 'Trebuchet MS', 'Pretendard', 'Noto Sans KR', system-ui,
    -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Consolas', ui-monospace,
    monospace;

  /* ─ sizes ───────────────────────────────────────────────────── */
  --grid-size: 40px;
  --radius-sm: 8px;
  --radius-md: 15px;
  --radius-lg: 30px;
  --radius-pill: 999px;

  /* ─ shadows / glows ─────────────────────────────────────────── */
  --glow-lime: 0 0 15px rgba(193, 255, 0, 0.6);
  --glow-lime-soft: 0 0 10px rgba(193, 255, 0, 0.25);
  --glow-cyan: 0 0 10px rgba(224, 247, 250, 0.6);
  --glow-pink: 0 0 10px rgba(255, 0, 60, 0.6);

  /* ─ motion ──────────────────────────────────────────────────── */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 0.2s;
  --dur: 0.3s;
  --dur-slow: 0.5s;

  /* ─ layout ──────────────────────────────────────────────────── */
  --container: 1000px;
  --container-narrow: 720px;
}

@property --angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}

@property --fill {
  syntax: '<length>';
  initial-value: 0px;
  inherits: false;
}

/* ─ reset ─────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-fg);
  -ms-overflow-style: none;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
  padding-top: 72px; /* 고정 네비바 높이 보정 */
}
@media (max-width: 600px) {
  body { padding-top: 60px; }
}

img,
video,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

body::-webkit-scrollbar {
  display: none;
}

/* ─ animated background grid ───────────────────────────────────── */
/* 정적 배경 + 격자 마스크. 400% bg + 20s 무한 애니메이션은 GPU 가 계속 갈려서 제거.
   원하는 무드는 유지하되 paint 는 1회만 발생. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: linear-gradient(
    125deg,
    var(--color-bg-elev) 0%,
    var(--color-midnight) 25%,
    var(--color-bg-elev) 50%,
    var(--color-garnet) 80%,
    var(--color-bg-elev) 100%
  );
  -webkit-mask-image:
    linear-gradient(#404040 1px, transparent 1px),
    linear-gradient(90deg, #404040 1px, transparent 1px);
  mask-image:
    linear-gradient(#404040 1px, transparent 1px),
    linear-gradient(90deg, #404040 1px, transparent 1px);
  -webkit-mask-size: var(--grid-size) var(--grid-size);
  mask-size: var(--grid-size) var(--grid-size);
  pointer-events: none;
  z-index: -2;
  opacity: 0.8;
  will-change: auto;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, transparent 30%, var(--color-bg) 80%);
  pointer-events: none;
  z-index: -1;
}

/* ─ layout helpers ─────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack, 20px);
}

.center {
  text-align: center;
}

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

/* ─ header / nav ───────────────────────────────────────────────── */
.top {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 800;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(8, 8, 8, 0.7);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin-inline: auto;
  padding: 10px clamp(16px, 4vw, 32px);
}

.logo {
  color: var(--color-fg);
  text-shadow:
    0 13px 2px var(--color-blue),
    0 -13px 2px var(--color-pink);
  transition: all var(--dur-slow) var(--ease);
  cursor: pointer;
}

.logo h1 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  margin: 0;
  letter-spacing: 2px;
}

.logo:hover,
.logo.touch-active {
  color: var(--color-accent);
  text-shadow: 0 0 5px var(--color-accent);
  transition: all 0.8s var(--ease);
}

.logo:active {
  color: var(--color-accent);
  text-shadow:
    0 -13px 4px var(--color-blue),
    0 13px 4px var(--color-pink);
  transition: all var(--dur) var(--ease);
}

.nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav a {
  color: var(--color-fg);
  font-size: 1rem;
  padding: 6px 2px;
  transition: all var(--dur) var(--ease);
  position: relative;
}

.nav a:hover,
.nav a.touch-active {
  text-shadow:
    0 13px 2px var(--color-blue),
    0 -13px 2px var(--color-pink);
}

.nav a[aria-current='page'] {
  color: var(--color-accent);
  text-shadow: 0 0 6px var(--color-accent);
}

.nav a:active {
  color: var(--color-accent);
  text-shadow: none;
}

.line {
  border: 0;
  border-top: 1px solid var(--color-accent);
  box-shadow: 0 0 3px var(--color-accent);
  margin: 0;
}

/* ─ typography ─────────────────────────────────────────────────── */
.h1,
.section-h1 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--color-fg);
  text-shadow: 0 0 10px rgba(224, 247, 250, 0.5);
  letter-spacing: 3px;
  font-weight: normal;
  border-bottom: 1px dashed rgba(224, 247, 250, 0.3);
  display: inline-block;
  padding-bottom: 10px;
  margin: 0 0 30px;
}

.h2 {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--color-fg);
  font-weight: 400;
  line-height: 1.7;
  max-width: 60ch;
  margin-inline: auto;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ─ typing hero ───────────────────────────────────────────────── */
.typing {
  width: 37ch;
  max-width: 100%;
  margin: 200px auto 0;
  padding-right: 3px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 4vw, 30px);
  white-space: nowrap;
  overflow: hidden;
  border-right: 3px solid;
  animation:
    typing 15s steps(37) infinite,
    blink 0.8s step-end infinite alternate;
}

@keyframes typing {
  from { width: 0; }
  25%  { width: 37ch; }
}

@keyframes blink {
  50% { border-color: transparent; }
}

/* ─ cta boxes (home) ──────────────────────────────────────────── */
.btntext {
  display: inline-block;
  color: var(--color-fg);
  font-size: 1.25rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
}

.btntext:hover,
.btntext.touch-active {
  color: var(--color-accent);
  text-shadow: 0 0 5px var(--color-accent);
  transition: all var(--dur-slow) var(--ease);
}

.box {
  width: min(300px, 100%);
  margin: 0 auto;
  padding: 20px;
  border-radius: var(--radius-lg);
  background-image: linear-gradient(var(--angle), var(--color-blue), var(--color-pink));
  animation:
    rotate-gradient 5s linear infinite,
    rotate-shadow 5s linear infinite;
  transition: all var(--dur) var(--ease);
  text-align: center;
}

.box:hover,
.box.touch-active {
  animation:
    rotate-gradient 3s linear infinite,
    rotate-shadow 3s linear infinite;
}

.box:active {
  animation:
    rotate-gradient 1s linear infinite,
    rotate-shadow 1s linear infinite;
}

.contact-box {
  width: min(300px, 100%);
  margin: 15px auto 0;
  padding: 20px;
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  animation: rotate-contact-shadow 5s linear infinite;
  transition: all var(--dur) var(--ease);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  text-align: center;
}

.contact-box:hover,
.contact-box.touch-active {
  animation: rotate-contact-shadow 3s linear infinite;
}

@keyframes rotate-shadow {
  0%   { box-shadow: 2px 0 3px var(--color-accent); }
  25%  { box-shadow: 0 -2px 3px var(--color-accent); }
  50%  { box-shadow: -2px 0 3px var(--color-accent); }
  75%  { box-shadow: 0 2px 3px var(--color-accent); }
  100% { box-shadow: 2px 0 3px var(--color-accent); }
}

@keyframes rotate-contact-shadow {
  0%   { box-shadow: 2px 0 3px var(--color-blue), -2px 0 3px var(--color-pink); }
  25%  { box-shadow: 0 -2px 3px var(--color-blue), 0 -2px 3px var(--color-pink); }
  50%  { box-shadow: -2px 0 3px var(--color-blue), 2px 0 3px var(--color-pink); }
  75%  { box-shadow: 0 2px 3px var(--color-blue), 0 -2px 3px var(--color-pink); }
  100% { box-shadow: 2px 0 3px var(--color-blue), -2px 0 3px var(--color-pink); }
}

@keyframes rotate-gradient {
  0%   { --angle: 0deg; }
  100% { --angle: 360deg; }
}

/* ─ sub-pro (home outro) ──────────────────────────────────────── */
.sub-pro {
  color: var(--color-fg);
  border-radius: 5px;
  text-align: center;
  backdrop-filter: blur(5px);
  margin: 100px auto 0;
  width: 100%;
  max-width: var(--container);
  box-shadow:
    0.5px 0 var(--color-accent),
    0 0.5px var(--color-accent),
    -0.5px 0 var(--color-accent),
    0 -0.5px var(--color-accent);
  padding: 20px;
  font-size: 1.2rem;
  transition: all var(--dur-slow) var(--ease);
}

.sub-pro:hover,
.sub-pro.touch-active {
  transform: translateY(-20px);
  border: 1px solid var(--color-accent);
}

.hh1 {
  color: var(--color-fg);
  transition: all 0.8s var(--ease);
}

.sub-pro:hover .hh1,
.sub-pro.touch-active .hh1 {
  color: var(--color-accent);
  transform: scale(1.05) translateY(-5px);
}

.sub-inner {
  font-size: 1.25rem;
  color: var(--color-fg);
  transition: all var(--dur-slow) var(--ease);
  margin-bottom: 20px;
}

.sub-pro:hover .sub-inner,
.sub-pro.touch-active .sub-inner {
  transform: translateY(10px) scale(1.05);
  margin-bottom: 30px;
}

/* ─ mouse scroll indicator ────────────────────────────────────── */
.mouse {
  border: 2px solid var(--color-fg);
  border-radius: 50px;
  width: 30px;
  height: 60px;
  margin: 200px auto 0;
}

.in-mouse {
  border: 2px solid var(--color-accent);
  border-radius: 50px;
  background-color: var(--color-bg);
  width: 20px;
  height: 25px;
  margin: 5px auto;
  animation: scroll 2s linear infinite;
}

.mouse-hint {
  margin-top: 20px;
  color: var(--color-fg-dim);
  font-size: 1.125rem;
  margin-bottom: 500px;
  font-family: 'Arial', sans-serif;
}

@keyframes scroll {
  0%   { transform: translateY(0); box-shadow: none; }
  50%  { transform: translateY(20px); box-shadow: 0 -10px 5px var(--color-accent); }
  100% { transform: translateY(0); box-shadow: none; }
}

/* ─ about box (profile slide) ─────────────────────────────────── */
.about-box {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--color-accent);
  border-radius: 95px;
  width: 100%;
  max-width: 800px;
  height: 190px;
  margin-inline: auto;
  background-image: linear-gradient(var(--angle), var(--color-blue), var(--color-pink));
  animation:
    rotate-gradient 5s linear infinite,
    rotate-shadow 5s linear infinite;
  transition: all var(--dur) var(--ease);
}

.about-box:hover,
.about-box.touch-active {
  animation:
    rotate-gradient 3s linear infinite,
    rotate-shadow 3s linear infinite;
}

.profile {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 150px;
  height: 150px;
  border-radius: 75px;
  object-fit: cover;
  z-index: 500;
  transition: left var(--dur-slow) var(--ease);
}

.about-box:hover .profile,
.about-box.touch-active .profile {
  left: calc(100% - 170px);
}

.info {
  position: relative;
  width: 100%;
  height: 100%;
  font-size: 1.125rem;
}

.first-info,
.second-info {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  transition: opacity var(--dur-slow) var(--ease);
  text-align: center;
}

.first-info {
  left: 170px;
  right: 20px;
  opacity: 1;
}

.second-info {
  left: 20px;
  right: 170px;
  opacity: 0;
}

.about-box:hover .first-info,
.about-box.touch-active .first-info {
  opacity: 0;
}

.about-box:hover .second-info,
.about-box.touch-active .second-info {
  opacity: 1;
}

.about-title {
  font-size: clamp(1.25rem, 2.5vw, 2rem);
  margin: 0 0 10px;
  line-height: 1.1;
}

.about-value {
  font-size: 1rem;
  margin: 0;
  opacity: 0.85;
}

/* ─ info-box (VALUES / GOALS / etc.) ──────────────────────────── */
.info-box {
  position: relative;
  background-color: rgba(8, 8, 8, 0.7);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(193, 255, 0, 0.3);
  color: var(--color-accent);
  width: 100%;
  max-width: 800px;
  padding: 50px 40px 30px;
  margin: 50px auto 0;
  font-family: var(--font-mono);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: 0;
  border-top-right-radius: 0;
  animation: pulse-border-glow 3s ease-in-out infinite;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  word-break: break-word;
}

.info-box:hover,
.info-box.touch-active {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(193, 255, 0, 0.15);
  border-color: rgba(193, 255, 0, 0.8);
}

.info-title-box {
  position: absolute;
  top: -25px;
  left: 40px;
  padding: 0 20px;
  min-width: 160px;
  height: 50px;
  background-color: var(--color-bg);
  border: 1px solid rgba(193, 255, 0, 0.8);
  border-radius: 25px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 0 15px rgba(224, 247, 250, 0.1),
    inset 0 0 10px rgba(193, 255, 0, 0.15);
  color: var(--color-fg);
  z-index: 10;
  font-family: 'Trebuchet MS', monospace;
}

.info-title-box h2 {
  font-size: 1.375rem;
  letter-spacing: 4px;
  margin: 0;
  text-shadow: 0 0 10px rgba(193, 255, 0, 0.6);
  font-weight: normal;
}

.info-box p {
  font-size: 0.95rem;
  line-height: 1.8;
  font-weight: 400;
  word-break: keep-all;
  opacity: 0.9;
  color: var(--color-fg);
  margin: 0;
}

@keyframes pulse-border-glow {
  0%   { box-shadow: 0 0 10px rgba(193, 255, 0, 0.05); }
  50%  { box-shadow: 0 0 20px rgba(193, 255, 0, 0.2); }
  100% { box-shadow: 0 0 10px rgba(193, 255, 0, 0.05); }
}

/* ─ records timeline (skills page) ────────────────────────────── */
.records {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.record {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.port-date {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 4.5rem;
  height: 4.5rem;
  border: 2px solid rgba(224, 247, 250, 0.4);
  border-radius: 50%;
  background-color: rgba(224, 247, 250, 0.05);
  font-size: 0.95rem;
  font-family: var(--font-mono);
  color: var(--color-fg);
  text-shadow: 0 0 8px rgba(224, 247, 250, 0.6);
  box-shadow:
    0 0 15px rgba(224, 247, 250, 0.1),
    inset 0 0 10px rgba(224, 247, 250, 0.1);
  transition: all var(--dur) var(--ease);
  flex-shrink: 0;
}

.port-date:hover,
.port-date.touch-active {
  border-color: var(--color-fg);
  box-shadow:
    0 0 20px rgba(224, 247, 250, 0.4),
    inset 0 0 15px rgba(224, 247, 250, 0.3);
  transform: scale(1.05);
}

.port-inner {
  display: inline-flex;
  align-items: center;
  flex: 1;
  min-width: 0;
  max-width: 40rem;
  height: 4.5rem;
  padding: 0 2rem;
  border: 0;
  border-left: 3px solid var(--color-accent);
  background: linear-gradient(90deg, rgba(193, 255, 0, 0.1) 0%, transparent 100%);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 1rem;
  letter-spacing: 1px;
  color: var(--color-accent);
  text-shadow: 0 0 5px rgba(193, 255, 0, 0.3);
  transition: all var(--dur) var(--ease);
}

.port-inner:hover,
.port-inner.touch-active {
  background: linear-gradient(90deg, rgba(193, 255, 0, 0.2) 0%, transparent 100%);
  transform: translateX(10px);
  border-left-width: 4px;
}

/* ─ skills cards ──────────────────────────────────────────────── */
.skill-card {
  box-shadow:
    0.5px 0 var(--color-accent),
    0 0.5px var(--color-accent),
    -0.5px 0 var(--color-accent),
    0 -0.5px var(--color-accent);
  border-radius: 10px;
  margin-top: 50px;
  backdrop-filter: blur(5px);
  width: 100%;
  max-width: 1000px;
  padding: 20px;
  position: relative;
  transition: all var(--dur) var(--ease);
}

.skill-card:hover,
.skill-card.touch-active {
  box-shadow: 0 0 15px var(--color-accent);
  transform: translateY(-5px);
}

.skill-icon {
  color: var(--color-pink);
  font-weight: bold;
  margin-bottom: 15px;
  font-family: var(--font-mono);
}

.skill-name {
  color: var(--color-fg);
  font-size: 1.2rem;
  margin: 0 0 10px;
}

.skill-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-fg);
  margin: 0;
}

/* ─ contact section ───────────────────────────────────────────── */
.contact-section {
  backdrop-filter: blur(5px);
  color: var(--color-fg);
  padding: 60px 20px;
  font-family: 'Courier New', Courier, monospace;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  border-radius: 5px;
  animation: contact-borders 5s linear infinite;
}

@keyframes contact-borders {
  0%   { box-shadow: -2px 0 var(--color-accent), 0.5px 0 var(--color-accent), 0 0.5px var(--color-accent), 0 -0.5px var(--color-accent); }
  25%  { box-shadow: 0 2px var(--color-accent), 0.5px 0 var(--color-accent), -0.5px 0 var(--color-accent), 0 -0.5px var(--color-accent); }
  50%  { box-shadow: 2px 0 var(--color-accent), -0.5px 0 var(--color-accent), 0 0.5px var(--color-accent), 0 -0.5px var(--color-accent); }
  75%  { box-shadow: 0 -2px var(--color-accent), 0.5px 0 var(--color-accent), 0 0.5px var(--color-accent), -0.5px 0 var(--color-accent); }
  100% { box-shadow: -2px 0 var(--color-accent), 0.5px 0 var(--color-accent), 0 0.5px var(--color-accent), 0 -0.5px var(--color-accent); }
}

.section-header {
  margin-bottom: 40px;
  text-align: center;
}

.section-title {
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(0, 255, 204, 0.5);
  margin-bottom: 30px;
  border-bottom: 1px solid var(--color-accent);
  display: inline-block;
  padding-bottom: 5px;
  font-weight: normal;
}

.terminal-text {
  color: var(--color-pink);
  font-size: 1.2rem;
  margin-top: 10px;
  opacity: 0.8;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.contact-card {
  background: rgba(193, 255, 0, 0.03);
  border: 1px solid rgba(193, 255, 0, 0.3);
  border-radius: var(--radius-sm);
  padding: 30px 20px;
  text-align: center;
  transition: all var(--dur) var(--ease);
  position: relative;
  overflow: hidden;
}

.contact-card:hover,
.contact-card.touch-active {
  background: rgba(193, 255, 0, 0.08);
  border-color: var(--color-accent);
  box-shadow:
    0 0 15px rgba(193, 255, 0, 0.6),
    inset 0 0 10px rgba(193, 255, 0, 0.2);
  transform: translateY(-5px);
}

.contact-icon {
  color: var(--color-accent);
  font-size: 1.5rem;
  font-weight: bold;
  margin-bottom: 15px;
  letter-spacing: 2px;
  font-family: var(--font-mono);
}

.contact-label {
  color: var(--color-pink);
  font-size: 1rem;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.contact-detail {
  color: var(--color-fg);
  font-size: 1rem;
  word-break: break-all;
}

/* ─ dashboard / pro-card ──────────────────────────────────────── */
.pro-card {
  border-radius: 10px;
  backdrop-filter: blur(5px);
  padding: 40px 20px;
  margin: 100px auto 0;
  box-shadow:
    0.5px 0 var(--color-accent),
    0 0.5px var(--color-accent),
    -0.5px 0 var(--color-accent),
    0 -0.5px var(--color-accent);
  width: 100%;
  max-width: 1000px;
  animation: contact-borders 5s ease infinite;
  text-align: center;
}

.boj-api {
  border-radius: 10px;
  display: inline-block;
  backdrop-filter: blur(5px);
  padding: 10px;
  margin: 20px;
  box-shadow:
    0.5px 0 var(--color-accent),
    0 0.5px var(--color-accent),
    -0.5px 0 var(--color-accent),
    0 -0.5px var(--color-accent);
  width: min(350px, 100%);
  transition: all var(--dur-slow) var(--ease);
}

.boj-api:hover,
.boj-api.touch-active {
  box-shadow:
    1px 0 var(--color-pink),
    0 1px var(--color-pink),
    -1px 0 var(--color-pink),
    0 -1px var(--color-pink);
  transform: translateY(-10px);
}

/* ─ rec grid (hobbies) ────────────────────────────────────────── */
.rec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 150px));
  justify-content: center;
  gap: 20px;
}

.rec-card {
  display: block;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid rgba(193, 255, 0, 0.3);
  transition: all var(--dur) var(--ease);
  cursor: pointer;
}

.rec-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  transition: transform var(--dur) var(--ease);
}

.rec-card:hover,
.rec-card.touch-active {
  border-color: var(--color-accent);
  box-shadow: var(--glow-lime);
  transform: translateY(-5px);
}

.rec-card:hover img,
.rec-card.touch-active img {
  transform: scale(1.05);
}

.rec-card:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 0 8px rgba(193, 255, 0, 0.3);
  border-color: var(--color-pink);
  transition: all 0.1s var(--ease);
}

/* ─ skills / records 2-column layout ──────────────────────────── */
.skills-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 100px;
}

@media (min-width: 900px) {
  .skills-layout {
    grid-template-columns: 1fr 1px 1fr;
    align-items: start;
  }

  .skills-layout::before {
    content: '';
    grid-column: 2;
    align-self: stretch;
    width: 1px;
    background: repeating-linear-gradient(
      to bottom,
      var(--color-accent) 0 6px,
      transparent 6px 12px
    );
    opacity: 0.7;
  }

  .contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ─ cursor glow (mouse follower) ──────────────────────────────── */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(193, 255, 0, 0.08) 0%,
    transparent 60%
  );
  transform: translate3d(-9999px, -9999px, 0);
  z-index: 1;
  mix-blend-mode: screen;
  transition: opacity 0.4s var(--ease);
  opacity: 0;
  will-change: transform;
}

.cursor-glow.active {
  opacity: 1;
}

/* ─ reading progress bar ──────────────────────────────────────── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-blue), var(--color-accent), var(--color-pink));
  z-index: 900;
  box-shadow: 0 0 8px var(--color-accent);
}

/* ─ command palette ───────────────────────────────────────────── */
.cmdk-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}

.cmdk-backdrop[data-open='true'] {
  display: flex;
}

.cmdk {
  width: min(600px, 92vw);
  background: rgba(8, 8, 8, 0.95);
  border: 1px solid rgba(193, 255, 0, 0.4);
  border-radius: var(--radius-md);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(193, 255, 0, 0.2);
  overflow: hidden;
  font-family: var(--font-mono);
}

.cmdk-input {
  width: 100%;
  padding: 18px 20px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(193, 255, 0, 0.2);
  color: var(--color-fg);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
}

.cmdk-input::placeholder {
  color: var(--color-fg-dim);
}

.cmdk-list {
  max-height: 50vh;
  overflow-y: auto;
  padding: 6px;
}

.cmdk-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-fg);
  cursor: pointer;
  font-size: 0.95rem;
}

.cmdk-item[aria-selected='true'],
.cmdk-item:hover {
  background: rgba(193, 255, 0, 0.08);
  color: var(--color-accent);
}

.cmdk-item-kbd {
  margin-left: auto;
  color: var(--color-fg-dim);
  font-size: 0.8rem;
}

.cmdk-hint {
  padding: 8px 14px;
  border-top: 1px solid rgba(193, 255, 0, 0.15);
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--color-fg-dim);
}

kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: 1px solid rgba(193, 255, 0, 0.3);
  border-radius: 4px;
  background: rgba(193, 255, 0, 0.05);
  color: var(--color-accent);
}

/* ─ footer ────────────────────────────────────────────────────── */
.site-footer {
  margin-top: 200px;
  padding: 40px 20px;
  text-align: center;
  color: var(--color-fg);
  font-size: 0.9rem;
  opacity: 0.8;
}

.site-footer a {
  color: var(--color-accent);
}

.site-footer a:hover {
  text-shadow: 0 0 5px var(--color-accent);
}

/* ─ prose (blog markdown) ─────────────────────────────────────── */
.prose {
  max-width: var(--container-narrow);
  margin-inline: auto;
  color: var(--color-fg);
  font-size: 1rem;
  line-height: 1.8;
  word-break: keep-all;
}

.prose > * + * {
  margin-top: 1.25em;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  color: var(--color-fg);
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.6em;
  font-weight: normal;
  letter-spacing: 1px;
}

.prose h1 { font-size: 2rem; border-bottom: 1px dashed rgba(224, 247, 250, 0.3); padding-bottom: 0.3em; }
.prose h2 { font-size: 1.5rem; color: var(--color-accent); text-shadow: 0 0 6px rgba(193, 255, 0, 0.3); }
.prose h3 { font-size: 1.25rem; color: var(--color-fg); }
.prose h4 { font-size: 1.05rem; color: var(--color-fg-dim); }

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(193, 255, 0, 0.4);
  text-underline-offset: 3px;
  transition: all var(--dur) var(--ease);
}

.prose a:hover {
  text-decoration-color: var(--color-accent);
  text-shadow: 0 0 5px var(--color-accent);
}

.prose strong { color: var(--color-accent); font-weight: 600; }
.prose em { color: var(--color-fg); font-style: italic; }

.prose ul,
.prose ol {
  padding-left: 1.5em;
  list-style: revert;
}

.prose li { margin-top: 0.4em; }
.prose li::marker { color: var(--color-accent); }

.prose blockquote {
  margin: 1.5em 0;
  padding: 0.8em 1.2em;
  border-left: 3px solid var(--color-accent);
  background: rgba(193, 255, 0, 0.05);
  color: var(--color-fg);
  font-style: italic;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(193, 255, 0, 0.1);
  color: var(--color-accent);
}

.prose pre {
  padding: 1.2em;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(193, 255, 0, 0.2);
  overflow-x: auto;
  background: #0a0a0a !important;
  position: relative;
}

.prose pre code {
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: 0.9rem;
}

.prose img {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(193, 255, 0, 0.15);
}

.prose hr {
  border: 0;
  border-top: 1px dashed rgba(224, 247, 250, 0.25);
  margin: 2.5em auto;
  width: 60%;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  padding: 10px 14px;
  border: 1px solid rgba(193, 255, 0, 0.2);
  text-align: left;
}

.prose th {
  background: rgba(193, 255, 0, 0.08);
  color: var(--color-accent);
}

.prose .heading-anchor {
  margin-left: 0.5em;
  opacity: 0;
  color: var(--color-accent);
  font-weight: 400;
  transition: opacity var(--dur) var(--ease);
}

.prose :is(h1, h2, h3, h4):hover .heading-anchor {
  opacity: 0.8;
}

/* copy-code button injected by script */
.copy-code-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(8, 8, 8, 0.8);
  border: 1px solid rgba(193, 255, 0, 0.3);
  border-radius: 4px;
  color: var(--color-accent);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.prose pre:hover .copy-code-btn,
.copy-code-btn:focus-visible {
  opacity: 1;
}

.copy-code-btn[data-copied='true'] {
  color: var(--color-fg);
  border-color: var(--color-fg);
}

/* ─ post list / card ──────────────────────────────────────────── */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 40px 0 0;
}

.post-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 16px 4px;
  border-bottom: 1px dashed rgba(224, 247, 250, 0.15);
  transition: all var(--dur) var(--ease);
  text-decoration: none;
}

.post-item:hover,
.post-item.touch-active {
  background: linear-gradient(90deg, rgba(193, 255, 0, 0.06), transparent);
  padding-left: 14px;
  border-bottom-color: rgba(193, 255, 0, 0.4);
}

.post-date {
  font-family: var(--font-mono);
  color: var(--color-fg-dim);
  font-size: 0.85rem;
  min-width: 90px;
}

.post-title {
  color: var(--color-fg);
  font-size: 1.05rem;
  margin: 0;
  font-weight: 400;
}

.post-item:hover .post-title {
  color: var(--color-accent);
  text-shadow: 0 0 5px rgba(193, 255, 0, 0.5);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  border: 1px solid rgba(193, 255, 0, 0.3);
  border-radius: var(--radius-pill);
  text-transform: lowercase;
  transition: all var(--dur) var(--ease);
}

.tag:hover {
  background: rgba(193, 255, 0, 0.12);
  border-color: var(--color-accent);
}

/* post meta / frontmatter header */
.post-header {
  max-width: var(--container-narrow);
  margin: 120px auto 40px;
  padding: 0 20px;
}

.post-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 12px;
  line-height: 1.2;
  letter-spacing: 1px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--color-fg-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ─ project card ──────────────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.project-card {
  display: block;
  padding: 24px;
  border: 1px solid rgba(193, 255, 0, 0.25);
  border-radius: var(--radius-md);
  background: rgba(8, 8, 8, 0.6);
  backdrop-filter: blur(4px);
  transition: all var(--dur) var(--ease);
}

.project-card:hover,
.project-card.touch-active {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  box-shadow: var(--glow-lime);
}

.project-card h3 {
  margin: 0 0 8px;
  color: var(--color-fg);
  font-size: 1.2rem;
}

.project-card:hover h3 {
  color: var(--color-accent);
}

.project-card p {
  color: var(--color-fg);
  opacity: 0.8;
  margin: 0 0 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-fg-dim);
}

.project-stack span {
  padding: 2px 8px;
  background: rgba(224, 247, 250, 0.05);
  border: 1px solid rgba(224, 247, 250, 0.1);
  border-radius: var(--radius-pill);
}

/* ─ TOC ───────────────────────────────────────────────────────── */
.toc {
  position: sticky;
  top: 120px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-left: 1px dashed rgba(193, 255, 0, 0.3);
  padding-left: 16px;
}

.toc-title {
  color: var(--color-accent);
  letter-spacing: 2px;
  margin-bottom: 10px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.toc ol {
  list-style: none;
  padding: 0;
}

.toc li {
  margin: 4px 0;
}

.toc li.depth-3 { padding-left: 14px; }
.toc li.depth-4 { padding-left: 28px; }

.toc a {
  color: var(--color-fg-dim);
  transition: color var(--dur) var(--ease);
}

.toc a:hover,
.toc a.active {
  color: var(--color-accent);
}

.blog-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 0 20px 80px;
  max-width: var(--container);
  margin-inline: auto;
}

@media (min-width: 1100px) {
  .blog-layout {
    grid-template-columns: 1fr 220px;
  }
}

/* ─ 404 ───────────────────────────────────────────────────────── */
.err-screen {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 20px;
  padding: 80px 20px;
  font-family: var(--font-mono);
}

.err-code {
  font-size: clamp(3rem, 10vw, 6rem);
  color: var(--color-pink);
  letter-spacing: 6px;
  text-shadow: 0 0 15px rgba(255, 0, 60, 0.6);
}

.err-line {
  font-size: 0.95rem;
  color: var(--color-fg-dim);
  max-width: 60ch;
  line-height: 1.8;
  text-align: left;
}

.err-line .label { color: var(--color-accent); }
.err-line .addr { color: var(--color-blue); }

/* ─ 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;
  }

  .typing {
    width: 37ch;
    border-right-color: transparent;
  }
}

/* ─ mobile tweaks ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .about-box {
    height: 120px;
    border-radius: 60px;
  }

  .profile {
    width: 80px;
    height: 80px;
    top: 20px;
    left: 20px;
  }

  .about-box:hover .profile,
  .about-box.touch-active .profile {
    left: calc(100% - 100px);
  }

  .first-info { left: 110px; right: 20px; }
  .second-info { left: 20px; right: 110px; }

  .info { font-size: 0.85rem; }
  .about-title { font-size: 1.1rem; }
  .about-value { font-size: 0.75rem; }

  .info-title-box { min-width: 130px; height: 44px; left: 20px; }
  .info-title-box h2 { font-size: 1rem; }
  .info-box { padding: 40px 24px 24px; }
  .info-box p { font-size: 0.85rem; }

  .h1, .section-h1 { font-size: 1.5rem; letter-spacing: 2px; }

  .boj-api { width: 100%; padding: 10px; margin: 12px 0; }

  .pro-card { padding: 20px; margin-top: 80px; }

  .sub-inner { font-size: 1rem; }

  .rec-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .record { gap: 12px; }
  .port-date { width: 3.5rem; height: 3.5rem; font-size: 0.8rem; }
  .port-inner { height: 3.5rem; padding: 0 1rem; }

  .cursor-glow { display: none; }
}

/* ─ 성능: 접근성 / 저전력 환경 최적화 ─────────────────────────── */
@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;
  }
  .cursor-glow { display: none; }
  .typing {
    animation: none;
    width: 37ch;
    border-right: 3px solid transparent;
  }
}

/* 모바일에서 무거운 효과 완화 — 배터리/저사양 GPU 보호 */
@media (max-width: 768px) {
  .top { backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
  .box, .contact-box {
    animation: none;
    box-shadow: 0 0 4px var(--color-accent);
  }
}

/* 너무 넓은 뷰포트 / 고해상도에서 기본 blur 도 좀 줄임 */
@media (pointer: coarse) {
  body::before { opacity: 0.55; }
}