/* ─────────────────────────────────────────────────────────
   Hyunjun-Kim.me · Common
   Sticky Header · Footer · Buttons · Links · Reset
   의존: design-tokens.css 선행
   ───────────────────────────────────────────────────────── */

/* ─── Fonts (CDN import · 웰컴/이력서/포트폴리오 공통) ─── */
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.css");
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700&display=swap");

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

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-ko);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "tnum" 1, "kern" 1;
  word-break: keep-all;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }

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

:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* ─── Link · Default Inline ─── */
a {
  color: var(--color-ink);
  text-decoration-line: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: text-decoration-thickness var(--dur-base) var(--ease-std),
              color var(--dur-base) var(--ease-std);
}
a:hover { text-decoration-thickness: 2px; }
a.no-underline { text-decoration: none; }

/* ─── Utility Containers ─── */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-inline: 2rem;
}
.container-wide {
  max-width: var(--portfolio-max);
  margin: 0 auto;
  padding-inline: 2rem;
}
@media (max-width: 767px) {
  .container,
  .container-wide {
    padding-inline: 1.25rem;
  }
}

/* ─── Dual-Language Toggle (data-lang 기반 자동 스왑)
   사용법: <p data-lang-ko>한글</p><p data-lang-en>English</p>
   웹사 Step 5가 <html data-lang="ko|en"> 속성만 토글하면 자동 전환
   JS 문자열 교체 없이 CSS만으로 해결 · SEO/번역툴 친화적 ─── */
[data-lang-ko],
[data-lang-en] { display: revert; }
html[data-lang="ko"] [data-lang-en],
html[data-lang="en"] [data-lang-ko] { display: none !important; }

/* ─── Visually Hidden (a11y) ─── */
.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;
}

/* ─── Skip link (a11y) ─── */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-ink);
  color: var(--color-paper);
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  text-decoration: none;
  z-index: calc(var(--z-sticky-header) + 1);
  transition: top var(--dur-base) var(--ease-std);
}
.skip-link:focus { top: 0.75rem; }

/* ═════════════════════════════════════════════════════════
   STICKY HEADER (모든 페이지 공통)
   ═════════════════════════════════════════════════════════ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky-header);
  height: var(--header-h-desktop);
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-hair) solid var(--color-stone);
}

.site-header__inner {
  height: 100%;
  max-width: var(--portfolio-max);
  margin: 0 auto;
  padding-inline: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__logo {
  font-family: var(--font-en);
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-meta);
  color: var(--color-ink);
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}
.site-header__logo .dot { color: var(--color-accent); margin-inline: 0.125em; }
.site-header__logo:hover {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

/* ─── Header · Language Toggle (상단 우측) ─── */
.lang-toggle[data-lang-toggle="header"] {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-en);
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-meta);
}
.lang-toggle[data-lang-toggle="header"] .lang-btn {
  background: transparent;
  border: 0;
  padding: 0.25rem 0.25rem;
  color: var(--color-graphite);
  font: inherit;
  letter-spacing: inherit;
  cursor: pointer;
  transition: color var(--dur-base) var(--ease-std);
  text-decoration: none;
  display: inline-block;
}
.lang-toggle[data-lang-toggle="header"] .lang-btn:hover {
  color: var(--color-ink);
}
.lang-toggle[data-lang-toggle="header"] .lang-btn[aria-current="true"] {
  color: var(--color-accent);
  font-weight: var(--fw-bold);
}
.lang-toggle[data-lang-toggle="header"] .sep {
  color: var(--color-stone);
  user-select: none;
}

/* ─── Header Right Group (CTA + Lang Toggle) ─── */
.site-header__right {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

/* ─── Header CTA · Compact Download Pill ─── */
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  background: var(--color-accent);
  color: var(--color-paper);
  font-family: var(--font-en);
  font-size: var(--fs-meta);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-meta);
  text-decoration: none;
  border-radius: var(--radius-1);
  transition: background var(--dur-base) var(--ease-std);
  white-space: nowrap;
  text-transform: uppercase;
}
.header-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-paper);
  text-decoration: none;
}
.header-cta .arrow {
  font-size: 0.95em;
  display: inline-block;
  line-height: 1;
}

/* ─── Mobile 조정 ─── */
@media (max-width: 767px) {
  .site-header { height: var(--header-h-mobile); }
  .site-header__inner { padding-inline: 1.25rem; }
  .site-header__right { gap: 0.625rem; }
  .header-cta { padding: 0.35rem 0.625rem; font-size: 0.625rem; }
}

/* ═════════════════════════════════════════════════════════
   BUTTONS
   ═════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 48px;
  padding: 0 2rem;
  font-family: var(--font-en);
  font-size: 0.9375rem; /* 15 */
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-meta);
  text-decoration: none;
  border-radius: var(--radius-0);
  border: 0;
  cursor: pointer;
  transition: background-color var(--dur-base) var(--ease-std),
              border-color var(--dur-base) var(--ease-std),
              color var(--dur-base) var(--ease-std),
              transform var(--dur-quick) var(--ease-std);
  user-select: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.btn:active { transform: scale(0.98); }

.btn .arrow {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-std);
}
.btn:hover .arrow { transform: translateX(4px); }

/* Primary */
.btn--primary {
  background: var(--color-accent);
  color: var(--color-paper);
}
.btn--primary:hover { background: var(--color-accent-hover); }

/* Secondary */
.btn--secondary {
  background: transparent;
  color: var(--color-ink);
  border: var(--border-hair) solid var(--color-stone);
}
.btn--secondary:hover {
  background: var(--color-whisper);
  border-color: var(--color-graphite);
}

/* Tertiary (인라인 텍스트 링크 느낌) */
.btn--tertiary {
  height: auto;
  padding: 0;
  background: transparent;
  color: var(--color-ink);
  text-decoration-line: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  font-size: var(--fs-body);
  letter-spacing: 0;
}
.btn--tertiary:hover {
  text-decoration-thickness: 2px;
  transform: none;
}
.btn--tertiary:active { transform: none; }

/* ═════════════════════════════════════════════════════════
   GLOBAL FOOTER (선택적 · 포트폴리오 / 이력서 하단)
   ═════════════════════════════════════════════════════════ */

.site-footer {
  border-top: var(--border-hair) solid var(--color-stone);
  padding: 2rem 0;
  text-align: center;
  font-family: var(--font-en);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-meta);
  color: var(--color-graphite);
}
.site-footer .sep { color: var(--color-hairline); margin-inline: 0.5em; }
.site-footer a {
  color: inherit;
  text-decoration-color: var(--color-hairline);
}
.site-footer a:hover {
  color: var(--color-ink);
  text-decoration-color: var(--color-accent);
}

/* ═════════════════════════════════════════════════════════
   MOTION UTILITIES (진입 애니메이션 · 공통)
   ═════════════════════════════════════════════════════════ */

.m-fade-up {
  opacity: 0;
  transform: translateY(8px);
  animation: mFadeUp 0.5s var(--ease-out) forwards;
}
.m-fade-up[data-delay="1"] { animation-delay: 0.1s; }
.m-fade-up[data-delay="2"] { animation-delay: 0.2s; }
.m-fade-up[data-delay="3"] { animation-delay: 0.3s; }
.m-fade-up[data-delay="4"] { animation-delay: 0.4s; }
.m-fade-up[data-delay="5"] { animation-delay: 0.5s; }
.m-fade-up[data-delay="6"] { animation-delay: 0.6s; }
.m-fade-up[data-delay="7"] { animation-delay: 0.7s; }

@keyframes mFadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.m-line {
  transform: scaleX(0);
  transform-origin: left;
  animation: mLine 0.45s var(--ease-out) 0.3s forwards;
}
@keyframes mLine {
  to { transform: scaleX(1); }
}

@media (prefers-reduced-motion: reduce) {
  .m-fade-up,
  .m-line {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
}
