/*
 * 코딩 바이브 — 랜딩 페이지
 *
 * 색: 늦은 밤 화면의 앰버 잔광. 따뜻한 먹빛 바탕 위에 종이색 본문,
 *     강조는 앰버(커서·링크), 구조는 아이리스(태그·포커스)가 나눠 맡습니다.
 * 활자: Hahmlet(한글 고대비 세리프)은 워드마크와 섹션 제목에만,
 *      본문은 IBM Plex Sans KR, 날짜·라벨 같은 기계적인 정보는 IBM Plex Mono.
 */

:root {
  --ink: #17120F;
  --ink-raised: #211A15;
  --line: #33291F;
  --paper: #F3EAE0;
  --dim: #A2938A;
  --amber: #FF9F35;
  --iris: #9AA6FF;
  --alert: #FF8D7B;

  --font-display: "Hahmlet", "Nanum Myeongjo", serif;
  --font-body: "IBM Plex Sans KR", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "IBM Plex Sans KR", ui-monospace, monospace;

  --page: min(1120px, 100% - 3rem);
  --radius: 3px;
}

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  /* 한글은 어절 안에서 끊기면 읽기 나빠집니다. */
  word-break: keep-all;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: var(--page);
  margin-inline: auto;
}

a {
  color: inherit;
}

:where(a, button, input, [tabindex]):focus-visible {
  outline: 2px solid var(--iris);
  outline-offset: 3px;
  border-radius: 2px;
}

/* 머리말 ------------------------------------------------------------ */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.75rem;
}

.mark {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.mark b {
  color: var(--amber);
  font-weight: 500;
}

.nav {
  display: flex;
  gap: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.nav a {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav a:hover {
  color: var(--paper);
}

/* 히어로 ------------------------------------------------------------ */

.hero {
  padding-block: clamp(3.5rem, 11vh, 8rem) clamp(2.75rem, 7vh, 5rem);
}

.wordmark {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 12vw, 8.5rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.wordmark-text {
  white-space: pre-wrap;
}

/* IME가 조합 중인 글자에 긋는 밑줄 */
.wordmark-text .composing {
  text-decoration: underline;
  text-decoration-color: var(--iris);
  text-decoration-thickness: 0.045em;
  text-underline-offset: 0.1em;
}

.caret {
  display: inline-block;
  width: 0.38em;
  height: 0.74em;
  margin-left: 0.09em;
  vertical-align: -0.03em;
  background: var(--amber);
  box-shadow: 0 0 1.4rem rgba(255, 159, 53, 0.45);
}

.caret.blink {
  animation: caret-blink 1.15s steps(1, end) infinite;
}

@keyframes caret-blink {
  50% {
    opacity: 0;
  }
}

.lead {
  max-width: 34rem;
  margin: 2.25rem 0 0;
  font-size: clamp(1.1rem, 2.1vw, 1.45rem);
  line-height: 1.6;
}

.lead-sub {
  margin-top: 0.5rem;
  color: var(--dim);
  font-size: clamp(1rem, 1.7vw, 1.15rem);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
  margin-top: 2.75rem;
}

.btn {
  display: inline-block;
  padding: 0.85rem 1.5rem;
  border: 0;
  border-radius: var(--radius);
  background: var(--amber);
  color: #1A1109;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover {
  background: #FFB763;
}

.link-arrow {
  color: var(--paper);
  font-size: 0.98rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.15rem;
  transition: border-color 0.15s ease;
}

.link-arrow:hover {
  border-color: var(--amber);
}

/* 섹션 공통 --------------------------------------------------------- */

.section {
  padding-block: clamp(2.25rem, 6vh, 4rem);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.55rem, 4vw, 2.3rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--dim);
}

/* 글 목록 ----------------------------------------------------------- */

.posts {
  border-top: 1px solid var(--line);
}

.post {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  align-items: baseline;
  gap: 0.35rem 1.5rem;
  padding: 1.35rem 1rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background 0.15s ease;
}

.post:hover {
  background: var(--ink-raised);
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--dim);
}

.post-title {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.45;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25em;
  transition: text-decoration-color 0.15s ease;
}

.post:hover .post-title {
  text-decoration-color: var(--amber);
}

.post-meta {
  display: flex;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
  white-space: nowrap;
}

.post-meta .tag {
  color: var(--iris);
}

/* 연재 리듬 --------------------------------------------------------- */

.rhythm {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.rhythm-item {
  background: var(--ink);
  padding: 1.9rem 1.6rem 2.1rem;
}

.rhythm-cadence {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber);
  letter-spacing: 0.03em;
}

.rhythm-title {
  margin: 0.6rem 0 0.7rem;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
}

.rhythm-body {
  margin: 0;
  color: var(--dim);
  font-size: 0.97rem;
  line-height: 1.7;
}

/* 뉴스레터 ---------------------------------------------------------- */

.newsletter {
  background: var(--ink-raised);
  border-left: 3px solid var(--amber);
  padding: clamp(1.75rem, 4vw, 3rem);
}

.newsletter-body {
  max-width: 42rem;
  margin: 0.9rem 0 0;
  color: var(--dim);
}

.form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.75rem;
}

.form input[type="email"] {
  flex: 1 1 17rem;
  min-width: 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.form input[type="email"]::placeholder {
  color: #6F625A;
}

.flash {
  margin: 1.1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.flash-ok {
  color: var(--amber);
}

.flash-err {
  color: var(--alert);
}

/* 꼬리말 ------------------------------------------------------------ */

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  margin-top: clamp(2rem, 6vh, 4rem);
  padding-block: 2.25rem 3.5rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--dim);
}

.footer p {
  margin: 0;
}

/* 좁은 화면 --------------------------------------------------------- */

@media (max-width: 46rem) {
  :root {
    --page: min(1120px, 100% - 2.5rem);
  }

  .post {
    grid-template-columns: 1fr;
    padding-inline: 0.25rem;
  }

  .post-meta {
    margin-top: 0.35rem;
  }

  .nav {
    gap: 1.1rem;
  }
}

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