/* =========================================================
   CodeReader — Editorial style for a coding curriculum site
   ========================================================= */

:root {
  /* Color: warm paper + ink, with a single sharp accent */
  --paper: #f4efe6;
  --paper-deep: #ebe4d4;
  --ink: #1a1814;
  --ink-soft: #3d3a33;
  --ink-mute: #6b6558;
  --rule: #c9c0ad;
  --accent: #c8451f;
  /* vermillion — used sparingly */
  --accent-deep: #9c3416;
  --code-bg: #1a1814;
  --code-fg: #f4efe6;
  --code-mute: #8a8578;
  --code-key: #e8a87c;
  --code-str: #b8d4a8;
  --code-com: #6b6558;

  /* Typography */
  --font-display: 'Fraunces', 'Noto Serif JP', serif;
  --font-body: 'Noto Serif JP', 'Fraunces', serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Layout */
  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--paper);
  /* subtle paper grain */
  background-image:
    radial-gradient(circle at 20% 30%, rgba(0, 0, 0, .015) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 0, 0, .015) 0%, transparent 50%);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: .2em;
}

/* ----- Header ----- */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(244, 239, 230, .92);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.site-logo {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -.01em;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--accent);
}

.site-logo__mark {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  font-family: var(--font-display);
  font-size: .95rem;
}

.site-nav a {
  color: var(--ink-soft);
}

.site-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

.site-nav__cta {
  border: 1px solid var(--ink);
  padding: .55rem 1.1rem;
  color: var(--ink) !important;
  transition: all .2s ease;
}

.site-nav__cta:hover {
  background: var(--ink);
  color: var(--paper) !important;
}

/* ----- Main wrapper ----- */
.site-main {
  min-height: 60vh;
}

/* ----- Hero (Top page) ----- */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(3rem, 9vw, 7rem) var(--gutter) clamp(2rem, 6vw, 5rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 900px) {
  .hero {
    grid-template-columns: 1.4fr .9fr;
    align-items: end;
  }
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero__eyebrow::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
  max-width: 120px;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 6.5vw, 4.8rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 1.5rem;
  color: var(--ink);
}

.hero__title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}

.hero__lede {
  font-size: 1.15rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 38ch;
  margin: 0 0 2rem;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  background: var(--ink);
  color: var(--paper);
  padding: 1rem 1.8rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  border: none;
  transition: all .25s ease;
}

.hero__cta:hover {
  background: var(--accent);
  color: var(--paper);
  text-decoration: none;
  transform: translateX(4px);
}

.hero__cta-arrow {
  font-family: var(--font-mono);
}

/* Code excerpt as visual element */
.hero__code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.7;
  position: relative;
  margin-top: 1rem;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .3);
}

.hero__code::before {
  content: 'sample.php';
  position: absolute;
  top: -.8rem;
  left: 1rem;
  background: var(--accent);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .7rem;
  padding: .25rem .7rem;
  letter-spacing: .05em;
}

.hero__code .c {
  color: var(--code-com);
  font-style: italic;
}

.hero__code .k {
  color: var(--code-key);
}

.hero__code .s {
  color: var(--code-str);
}

.hero__code .m {
  color: var(--code-mute);
}

/* ----- Section heads ----- */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) var(--gutter);
  border-top: 1px solid var(--rule);
}

.section__num {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--accent);
  letter-spacing: .15em;
  margin-bottom: .8rem;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -.01em;
}

.section__lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0 0 3rem;
}

/* ----- 3-layer cards ----- */
.layers {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .layers {
    grid-template-columns: repeat(3, 1fr);
  }
}

.layer {
  background: var(--paper-deep);
  padding: 2.2rem 2rem;
  border-top: 3px solid var(--ink);
  position: relative;
  transition: transform .3s ease;
}

.layer:hover {
  transform: translateY(-4px);
}

.layer:nth-child(2) {
  border-top-color: var(--accent);
}

.layer:nth-child(3) {
  border-top-color: var(--ink);
}

.layer__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--ink-mute);
  letter-spacing: .15em;
}

.layer__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  margin: .4rem 0 1rem;
  letter-spacing: -.01em;
}

.layer__verb {
  display: inline-block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.layer__desc {
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

.layer__topics {
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--ink-mute);
}

.layer__topics li {
  padding: .35rem 0;
  border-bottom: 1px dashed var(--rule);
}

.layer__topics li:last-child {
  border-bottom: none;
}

/* ----- Why-this section ----- */
.why {
  display: grid;
  gap: 3rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .why {
    grid-template-columns: .8fr 1.2fr;
  }
}

.why__big {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}

.why__big::before {
  content: '"';
  font-size: 4rem;
  color: var(--accent);
  display: block;
  line-height: .5;
  margin-bottom: 1rem;
}

.why__body p {
  margin: 0 0 1.2rem;
  color: var(--ink-soft);
}

.why__body p:last-child {
  margin-bottom: 0;
}

/* ----- Curriculum (toc) ----- */
.toc {
  max-width: 900px;
  margin: 0 auto;
}

.toc__layer {
  margin-bottom: 4rem;
}

.toc__layer-head {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  border-bottom: 2px solid var(--ink);
  padding-bottom: .8rem;
  margin-bottom: 2rem;
}

.toc__layer-num {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  letter-spacing: .1em;
}

.toc__layer-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.7rem;
  margin: 0;
}

.toc__chapter {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.2rem 0;
  border-bottom: 1px dashed var(--rule);
  text-decoration: none;
  color: var(--ink);
  transition: padding .2s ease;
}

.toc__chapter:hover {
  padding-left: 1rem;
  text-decoration: none;
  background: linear-gradient(to right, var(--paper-deep), transparent);
}

.toc__chapter-num {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--ink-mute);
  min-width: 3em;
}

.toc__chapter-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
}

.toc__chapter-meta {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ink-mute);
  letter-spacing: .05em;
}

.toc__chapter--disabled {
  opacity: .45;
  cursor: default;
}

.toc__chapter--disabled:hover {
  padding-left: 0;
  background: none;
}

.lesson__nav-disabled {
  color: var(--ink-mute);
  opacity: .55;
  font-style: italic;
}

/* ----- Lesson page ----- */
.lesson {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) var(--gutter);
}

.lesson__crumb {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--ink-mute);
  letter-spacing: .1em;
  margin-bottom: 1.2rem;
}

.lesson__crumb a {
  color: var(--ink-mute);
}

.lesson__crumb a:hover {
  color: var(--accent);
}

.lesson__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: 0 0 1rem;
  color: var(--ink);
}

.lesson__lede {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.3rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
}

.lesson h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.7rem;
  letter-spacing: -.01em;
  margin: 3rem 0 1rem;
  position: relative;
  padding-left: 1.5rem;
}

.lesson h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: .55em;
  width: .7rem;
  height: .7rem;
  background: var(--accent);
}

.lesson h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  margin: 2.2rem 0 .8rem;
}

.lesson p {
  margin: 0 0 1.3rem;
}

.lesson strong {
  font-weight: 700;
  color: var(--ink);
}

.lesson ul,
.lesson ol {
  padding-left: 1.5rem;
  margin: 0 0 1.3rem;
}

.lesson li {
  margin: .4rem 0;
}

/* Code block — wrapper holds the label, inner scrolls */
.codeblock {
  position: relative;
  margin: 2.4rem 0 2rem;
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, .25);
}

.codeblock::before {
  content: attr(data-lang);
  position: absolute;
  top: -.7rem;
  left: 1rem;
  background: var(--accent);
  color: var(--paper);
  font-size: .68rem;
  padding: .2rem .65rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  z-index: 1;
}

.codeblock pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.6rem 1.8rem 1.4rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.75;
  margin: 0;
  overflow-x: auto;
  /* === や !== が合字で 1 文字に見えないよう、リガチャを無効化 */
  font-variant-ligatures: none;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0;
}

.codeblock .c {
  color: var(--code-com);
  font-style: italic;
}

.codeblock .k {
  color: var(--code-key);
}

.codeblock .s {
  color: var(--code-str);
}

.codeblock .m {
  color: var(--code-mute);
}

/* Inline code */
.lesson code:not(.codeblock code) {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--paper-deep);
  padding: .15em .45em;
  color: var(--accent-deep);
  border: 1px solid var(--rule);
  /* === や !== が合字で 1 文字に見えないよう、リガチャを無効化 */
  font-variant-ligatures: none;
  -webkit-font-feature-settings: "liga" 0, "clig" 0, "calt" 0;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0;
}

/* Callouts */
.callout {
  border-left: 3px solid var(--accent);
  background: var(--paper-deep);
  padding: 1.3rem 1.5rem;
  margin: 2rem 0;
  font-size: .95rem;
}

.callout__label {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .5rem;
}

.callout p {
  margin: 0;
}

.callout--warn {
  border-left-color: var(--ink);
}

.callout--warn .callout__label {
  color: var(--ink);
}

/* Exercise box */
.exercise {
  border: 2px solid var(--ink);
  padding: 2rem;
  margin: 3rem 0;
  background: var(--paper);
  position: relative;
}

.exercise__label {
  position: absolute;
  top: -.85rem;
  left: 1.5rem;
  background: var(--paper);
  padding: 0 .8rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .15em;
  color: var(--ink);
}

.exercise__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 0 1rem;
}

.exercise__task {
  font-size: .95rem;
  margin-bottom: 1.2rem;
}

.exercise details {
  border-top: 1px dashed var(--rule);
  padding-top: 1rem;
  margin-top: 1rem;
}

.exercise summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--accent);
  font-size: .95rem;
  list-style: none;
}

.exercise summary::-webkit-details-marker {
  display: none;
}

.exercise summary::before {
  content: '▸ ';
  transition: transform .2s ease;
  display: inline-block;
}

.exercise[open] summary::before,
.exercise details[open] summary::before {
  content: '▾ ';
}

.exercise details[open] .exercise__answer {
  margin-top: 1rem;
  font-size: .92rem;
}

/* Lesson nav */
.lesson__nav {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: .95rem;
}

.lesson__nav a {
  color: var(--ink-soft);
}

.lesson__nav a:hover {
  color: var(--accent);
}

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--paper-deep);
  margin-top: 6rem;
  text-align: center;

}

.site-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem var(--gutter) 2.5rem;
  text-align: center;
}

.site-footer__brand {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: .8rem;
}

.site-footer__tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
}

.site-footer__copy {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ink-mute);
  letter-spacing: .05em;
  margin: 0;
}

/* ----- Reveal animation ----- */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

.hero__eyebrow,
.hero__title,
.hero__lede,
.hero__cta,
.hero__code {
  animation: rise .9s ease backwards;
}

.hero__title {
  animation-delay: .1s;
}

.hero__lede {
  animation-delay: .25s;
}

.hero__cta {
  animation-delay: .4s;
}

.hero__code {
  animation-delay: .15s;
}

/* =========================================================
   Common buttons (used across mypage / auth / upgrade pages)
   ========================================================= */
.btn,a.btn {
  display: inline-block;
  padding: .85rem 1.6rem;
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: .02em;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}

.btn:hover,
a.btn:hover {
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.btn:disabled,
.btn[disabled] {
  color: var(--ink-mute);
  border-color: var(--rule);
  cursor: not-allowed;
  background: transparent;
}

.btn--primary,
a.btn--primary {
  color: var(--paper);
  background: var(--accent);
  border-color: var(--accent);
}

.btn--primary:hover,
a.btn--primary:hover  {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: var(--paper);
}

.btn--quiet,
a.btn--quiet  {
  border-color: var(--rule);
  color: var(--ink-mute);
  font-size: .88rem;
  padding: .8rem 1.3rem;
}

.btn--quiet:hover,
a.btn--quiet:hover  {
  background: transparent;
  border-color: var(--ink-mute);
  color: var(--ink);
}

.read-marker {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(3rem, 6vw, 5rem);
}

.read-marker__form {
  margin: 0;
}

/* 既読ボタンのスタイル (.btn と独立した専用クラス) */
.btn--read {
  display: inline-block;
  padding: .85rem 1.6rem;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 0;
  cursor: pointer;
  letter-spacing: .02em;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}

.btn--read:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* 既読済み表示 (ボタンが消えた後のテキスト) */
.read-marker__done {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  letter-spacing: .03em;
  margin: 0;
}

/* =========================================================
   My page
   ========================================================= */
.mypage {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter);
}

/* ----- Greeting + plan badge ----- */
.mypage__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.mypage__greeting {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0;
  color: var(--ink);
}

.mypage__plan {
  margin: 0;
}

.plan-badge {
  display: inline-block;
  padding: .35rem .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  border-radius: 0;
}

.plan-badge--free {
  color: var(--ink-mute);
}

.plan-badge--paid {
  color: var(--accent);
}

/* ----- Notice banners ----- */
.mypage__notice {
  margin: 0 0 1.8rem;
  padding: 1.2rem 1.4rem;
  background: var(--paper-deep);
  border-left: 3px solid var(--ink-soft);
  font-size: .96rem;
  line-height: 1.7;
}

.mypage__notice p {
  margin: 0;
}

.mypage__notice p+p {
  margin-top: .4rem;
}

.mypage__notice strong {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05em;
}

.mypage__notice-sub {
  color: var(--ink-mute);
  font-size: .9rem;
}

.mypage__notice--warn {
  border-left-color: var(--accent);
  background: rgba(200, 69, 31, .06);
}

.mypage__notice--warn a {
  color: var(--accent);
}

/* ----- Action buttons row ----- */
.mypage__actions {
  display: flex;
  gap: .9rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* ----- Progress section ----- */
.mypage__progress h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.5rem;
  margin: 0 0 2rem;
  padding-bottom: .8rem;
  border-bottom: 1px solid var(--rule);
  letter-spacing: -.01em;
}

.progress-layer-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  color: var(--ink);
  margin: 2.2rem 0 1rem;
  letter-spacing: .01em;
}

.progress-layer-title:first-of-type {
  margin-top: 0;
}

.progress-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.progress-item {
  display: grid;
  grid-template-columns: 2.2rem 4rem 1fr auto;
  align-items: baseline;
  gap: .6rem 1rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: .98rem;
  line-height: 1.5;
}

.progress-item__mark {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink-mute);
  text-align: center;
}

.progress-item--done .progress-item__mark {
  color: var(--accent);
  font-weight: 700;
}

.progress-item--locked .progress-item__mark {
  font-size: .9rem;
}

.progress-item__id {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--ink-mute);
  letter-spacing: .04em;
}

.progress-item__title a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease, color .15s ease;
}

.progress-item__title a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.progress-item--locked .progress-item__title {
  color: var(--ink-mute);
}

.progress-item__date,
.progress-item__hint {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--ink-mute);
  letter-spacing: .02em;
  white-space: nowrap;
}

.progress-item__date {
  color: var(--accent);
}

/* =========================================================
   Auth pages (register / login / verify / verify_notice)
   ========================================================= */

.auth-container {
  max-width: 28rem;
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5rem) var(--gutter);
}

.auth-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 1.2rem;
  color: var(--ink);
}

.auth-lede {
  font-size: .98rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 2.2rem;
}

/* ----- Form ----- */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  margin-bottom: 2rem;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  font-family: var(--font-display);
  font-size: .88rem;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: .02em;
}

.auth-form input[type="text"],
.auth-form input[type="email"],
.auth-form input[type="password"] {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  padding: .8rem 1rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 0;
  transition: border-color .15s ease;
  width: 100%;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--ink);
}

.auth-form .btn {
  align-self: flex-start;
  margin-top: .6rem;
}

/* ----- Error / success messages ----- */
.auth-errors {
  list-style: none;
  margin: 0 0 1.8rem;
  padding: 1rem 1.2rem;
  background: rgba(200, 69, 31, .06);
  border-left: 3px solid var(--accent);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
}

.auth-errors li {
  margin: 0;
}

.auth-errors li+li {
  margin-top: .3rem;
}

.auth-success {
  margin: 0 0 1.8rem;
  padding: 1rem 1.2rem;
  background: var(--paper-deep);
  border-left: 3px solid var(--ink-soft);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
}

.auth-note {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-mute);
  padding: 1rem 1.2rem;
  background: var(--paper-deep);
  border-left: 3px solid var(--rule);
  margin: 0 0 1.8rem;
}

/* ----- Link footer area ----- */
.auth-link {
  font-size: .92rem;
  color: var(--ink-soft);
  margin: 1.2rem 0 0;
  text-align: center;
}

.auth-link a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease;
}

.auth-link a:hover {
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.auth-link--small {
  font-size: .82rem;
  color: var(--ink-mute);
  line-height: 1.7;
}

/* =========================================================
   Upgrade pages (upgrade.php / upgrade_return.php)
   and inline paywall in lessons (preview mode)
   ========================================================= */

/* ----- Upgrade container ----- */
.upgrade-container {
  max-width: 32rem;
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5rem) var(--gutter);
  text-align: center;
}

.upgrade-container h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 4.5vw, 2.4rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 1.5rem;
  color: var(--ink);
}

/* Price callout */
.upgrade-price {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin: 0 0 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
}

.upgrade-price strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -.02em;
  margin-bottom: .3rem;
  line-height: 1.1;
}

/* Feature list */
.upgrade-features {
  list-style: none;
  margin: 0 0 2.8rem;
  padding: 0;
  text-align: left;
  display: inline-block;
}

.upgrade-features li {
  position: relative;
  padding: .55rem 0 .55rem 1.6rem;
  font-size: .98rem;
  line-height: 1.6;
  color: var(--ink);
}

.upgrade-features li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: .55rem;
  color: var(--accent);
  font-family: var(--font-mono);
}

/* Error message */
.upgrade-error {
  margin: 0 0 1.8rem;
  padding: 1rem 1.2rem;
  background: rgba(200, 69, 31, .06);
  border-left: 3px solid var(--accent);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
  text-align: left;
}

/* CTA button area */
.upgrade-container form {
  margin: 0 0 1.5rem;
}

.upgrade-container .btn {
  font-size: 1rem;
  padding: 1rem 2.2rem;
}

/* Caveat note under the button */
.upgrade-note {
  font-size: .82rem;
  color: var(--ink-mute);
  line-height: 1.7;
  margin: 1.2rem 0 0;
}

/* Secondary link below CTA (e.g. "マイページへ") */
.upgrade-container p>a:not(.btn) {
  display: inline-block;
  margin-top: 1rem;
  font-size: .9rem;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease, color .15s ease;
}

.upgrade-container p>a:not(.btn):hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* =========================================================
   Inline paywall in lesson pages (preview mode)
   access_guard.php の finalize_preview_if_needed() が出力する
   <section class="lesson__paywall"> のスタイル
   ========================================================= */

.lesson__paywall {
  margin: 0 auto 2rem;
  max-width: var(--measure);
  padding: 0 var(--gutter);
  position: relative;
}

/* 本文末尾の数行に上から下へ「霧」を重ねて、内容が消えていく演出をする。
   absolute 配置で左右の padding 領域も含めて全幅にグラデーションをかける。
   これにより、本文の左右端の文字までちゃんと霧で隠れる。 */
.lesson__paywall::before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: -7rem;
  height: 7rem;
  background: linear-gradient(to bottom,
      transparent 0%,
      rgba(244, 239, 230, .4) 35%,
      rgba(244, 239, 230, .85) 70%,
      var(--paper) 100%);
  pointer-events: none;
  z-index: 2;
}

.lesson__paywall-inner {
  position: relative;
  padding: 3rem 2.5rem;
  background: var(--paper-deep);
  border-top: 3px solid var(--accent);
  text-align: center;
  z-index: 3;
}

.lesson__paywall-lead {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 1.2rem;
  letter-spacing: -.005em;
}

.lesson__paywall-body {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 32rem;
  margin: 0 auto 2rem;
}

.lesson__paywall-cta {
  margin: 0;
}

.lesson__paywall-cta .btn {
  font-size: 1rem;
  padding: 1rem 2.2rem;
}

/* =========================================================
   Mobile responsive (≤ 720px)
   ========================================================= */
@media (max-width: 720px) {
  body {
    font-size: 16px;
    line-height: 1.85;
  }

  /* ----- Header: stack logo + nav vertically ----- */
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: .9rem;
    padding: .9rem var(--gutter);
  }

  .site-logo {
    font-size: 1.2rem;
  }

  .site-nav {
    width: 100%;
    gap: 1.2rem;
    font-size: .88rem;
    flex-wrap: wrap;
  }

  .site-nav a {
    white-space: nowrap;
  }

  .site-nav__cta {
    margin-left: auto;
    padding: .45rem .9rem;
  }

  /* ----- Hero ----- */
  .hero {
    padding-top: 2.5rem;
    gap: 2rem;
  }

  .hero__title {
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .hero__lede {
    font-size: 1.02rem;
    max-width: none;
  }

  .hero__code {
    font-size: .72rem;
    padding: 1.5rem 1.2rem;
  }

  /* ----- Sections ----- */
  .section__title {
    font-size: 1.7rem;
  }

  .section__lede {
    font-size: 1rem;
  }

  /* ----- Layer cards ----- */
  .layer {
    padding: 1.8rem 1.5rem;
  }

  /* ----- Why section: reset quotation visual ----- */
  .why__big {
    font-size: 1.4rem;
    line-height: 1.5;
  }

  .why__big::before {
    font-size: 3rem;
  }

  /* ----- TOC ----- */
  .toc__chapter {
    grid-template-columns: 1fr;
    gap: .25rem;
    padding: 1rem 0;
  }

  .toc__chapter:hover {
    padding-left: 0;
    background: none;
  }

  .toc__chapter-title {
    font-size: 1.05rem;
    line-height: 1.5;
  }

  .toc__layer-title {
    font-size: 1.4rem;
  }

  /* ----- Lesson body ----- */
  .lesson {
    padding: 2rem var(--gutter);
  }

  .lesson__title {
    font-size: 2rem;
  }

  .lesson__lede {
    font-size: 1.1rem;
  }

  .lesson h2 {
    font-size: 1.4rem;
    padding-left: 1.2rem;
  }

  .lesson h3 {
    font-size: 1.15rem;
  }

  /* Code block: tighter padding, smaller text */
  .codeblock {
    margin: 2rem 0 1.8rem;
  }

  .codeblock pre {
    padding: 1.4rem 1.1rem 1.2rem;
    font-size: .72rem;
    line-height: 1.7;
  }

  /* Exercise box */
  .exercise {
    padding: 1.5rem 1.2rem;
  }

  .exercise__title {
    font-size: 1.1rem;
  }

  /* ----- Lesson nav: stack vertically ----- */
  .lesson__nav {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .lesson__nav a,
  .lesson__nav-disabled {
    display: block;
    width: 100%;
  }

  /* ----- Footer ----- */
  .site-footer__inner {
    padding: 2.5rem var(--gutter) 2rem;
  }

  .mypage {
    padding: 2rem var(--gutter);
  }

  .mypage__head {
    flex-direction: column;
    align-items: flex-start;
    gap: .8rem;
    margin-bottom: 2rem;
    padding-bottom: 1.2rem;
  }

  .mypage__greeting {
    font-size: 1.55rem;
  }

  .mypage__notice {
    padding: 1rem 1.1rem;
    font-size: .92rem;
  }

  .mypage__actions {
    flex-direction: column;
    align-items: stretch;
    gap: .7rem;
    margin-bottom: 2.8rem;
  }

  .mypage__actions .btn {
    text-align: center;
  }

  .mypage__progress h2 {
    font-size: 1.35rem;
    margin-bottom: 1.5rem;
  }

  .progress-layer-title {
    font-size: 1.05rem;
    margin: 1.8rem 0 .8rem;
  }

  /* Stack the row: mark + id on top, title underneath, date at bottom */
  .progress-item {
    grid-template-columns: 2rem 1fr;
    grid-template-areas:
      "mark id"
      "mark title"
      "mark date";
    gap: .15rem .8rem;
    padding: .9rem 0;
  }

  .progress-item__mark {
    grid-area: mark;
    align-self: start;
    padding-top: .15rem;
  }

  .progress-item__id {
    grid-area: id;
  }

  .progress-item__title {
    grid-area: title;
    font-size: 1rem;
    line-height: 1.55;
  }

  .progress-item__date,
  .progress-item__hint {
    grid-area: date;
    font-size: .75rem;
  }

  .auth-container {
    padding: 2.5rem var(--gutter);
  }

  .auth-title {
    font-size: 1.55rem;
    margin-bottom: 1rem;
  }

  .auth-lede {
    font-size: .94rem;
    margin-bottom: 1.8rem;
  }

  .auth-form {
    gap: 1.2rem;
  }

  .auth-form .btn {
    align-self: stretch;
    text-align: center;
  }

  .upgrade-container {
    padding: 2.5rem var(--gutter);
  }

  .upgrade-container h1 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
  }

  .upgrade-price {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
  }

  .upgrade-price strong {
    font-size: 2rem;
  }

  .upgrade-features {
    margin-bottom: 2.2rem;
  }

  .upgrade-features li {
    font-size: .94rem;
    padding-left: 1.4rem;
  }

  .upgrade-container .btn {
    width: 100%;
    text-align: center;
  }

  /* ----- Inline paywall ----- */
  .lesson__paywall {
    margin-top: 3rem;
  }

  .lesson__paywall-inner {
    padding: 2.2rem 1.5rem;
  }

  .lesson__paywall-lead {
    font-size: 1.2rem;
  }

  .lesson__paywall-body {
    font-size: .95rem;
  }

  .lesson__paywall-cta .btn {
    width: 100%;
  }

  .read-marker {
    padding-bottom: 2.5rem;
  }
}

*:focus {
  outline: none;
}

/* キーボード操作のときだけ、朱色の細い実線でフォーカスを示す */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 1px;
}

/* リンクやロゴ要素は枠線が密着しすぎるとカクつくので、少し外側に出す */
.site-logo:focus-visible,
.site-nav a:focus-visible {
  outline-offset: 4px;
}

/* フッター 姉妹サイトリンク */
.site-footer__sister {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0 0 1.8rem;
  letter-spacing: 0.02em;
}

.site-footer__sister a {
  color: var(--accent);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.site-footer__sister a:hover {
  border-bottom-color: var(--accent);
}

/* フッター リーガルリンク */
.site-footer__legal {
  margin: 1.5rem 0 1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-align: center;
  line-height: 1.8;
}

.site-footer__legal a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-footer__legal a:hover {
  color: var(--ink);
  border-bottom-color: var(--rule);
}

.site-footer__sep {
  margin: 0 0.6rem;
  color: var(--ink-mute);
}

@media (max-width: 720px) {
  .site-footer__legal {
    font-size: 0.8rem;
  }
  .site-footer__sep {
    margin: 0 0.4rem;
  }
}

/* 特商法の表(deal_info.php) */
.legal-table {
  width: 100%;
  max-width: var(--measure);
  margin: 2rem auto;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
}

.legal-table th,
.legal-table td {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  text-align: left;
}

.legal-table th {
  width: 30%;
  background: var(--paper-deep);
  color: var(--ink);
  font-weight: 500;
  white-space: nowrap;
}

.legal-table td {
  color: var(--ink-soft);
}

.legal-note {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--ink-mute);
}

@media (max-width: 720px) {
  .legal-table {
    font-size: 0.9rem;
  }
  .legal-table,
  .legal-table tbody,
  .legal-table tr,
  .legal-table th,
  .legal-table td {
    display: block;
    width: 100%;
  }
  .legal-table th {
    background: var(--paper-deep);
    padding: 0.6rem 1rem;
    border-bottom: none;
    white-space: normal;
  }
  .legal-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--rule);
  }
}

/* 制定日表示(legal pages 共通) */
.lesson__meta {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--ink-mute);
  text-align: right;
  font-family: var(--font-body);
}

/* ============================================
   付録 リファレンステーブル
============================================ */
.ref-table {
  width: 100%;
  max-width: 54rem;
  margin: 2rem auto;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  table-layout: fixed;
}

.ref-table code {
  word-break: break-all;
}

.ref-table th,
.ref-table td {
  padding: 0.8rem 1rem;
  border: 1px solid var(--rule);
  vertical-align: top;
  text-align: left;
}

.ref-table th {
  background: var(--paper-deep);
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.ref-table td {
  color: var(--ink-soft);
}

.ref-table code {
  background: var(--paper-deep);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.85em;
}

.ref-table a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ref-table a:hover {
  color: var(--ink-soft);
}

@media (max-width: 720px) {
  .ref-table {
    font-size: 0.85rem;
  }
  .ref-table th,
  .ref-table td {
    padding: 0.6rem 0.7rem;
  }
}