:root {
  color-scheme: light dark;
  --color-bg: #F7F5EF;
  --color-bg-alt: #FFFDF8;
  --color-text: #17150F;
  --color-text-muted: #5C564A;
  --color-text-muted-2: #3A3527;
  --color-border: #DFDACB;
  --color-border-strong: #17150F;
  --color-link: #1B3BE0;
  --color-link-hover: #E24A12;
  --color-focus-ring: #1B3BE0;
  --color-nav-hover-bg: #EDE8DA;
  --color-yellow: #FFD84D;
  --color-note-yellow-bg: #FBEFA0;
  --color-note-yellow-border: #E7D97A;
  --color-note-yellow-text: #6B6031;
  --color-note-blue-bg: #CFE6F7;
  --color-note-blue-border: #A9CFE8;
  --color-note-blue-text: #2C5470;
  --color-note-blue-hover: #B9DBF1;
  --color-badge-bg: #17150F;
  --color-badge-text: #ffffff;
  --color-timeline-dot: #8A7A3E;
  --color-timeline-line: #C9BE93;
  --color-scope-dashed: #9A9483;
  --color-scope-alt-bg: #F1EDE1;
  --color-footer-bg: #17150F;
  --color-footer-text: #F7F5EF;
  --color-footer-muted: #B5AF9E;
  --color-header-bg: rgba(247, 245, 239, 0.92);
  --color-card-bg: #F7F5EF;
  --color-card-hover-bg: #EFEADC;
  --shadow-color: rgba(23, 21, 15, 0.08);
  --shadow-color-strong: rgba(23, 21, 15, 0.28);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #17150F;
    --color-bg-alt: #1E1B14;
    --color-text: #F2EFE6;
    --color-text-muted: #B5AF9E;
    --color-text-muted-2: #C9C2AE;
    --color-border: #3A3527;
    --color-border-strong: #F2EFE6;
    --color-link: #7C93FF;
    --color-link-hover: #FF8552;
    --color-focus-ring: #7C93FF;
    --color-nav-hover-bg: #2A2719;
    --color-yellow: #FFD84D;
    --color-note-yellow-bg: #4A3F17;
    --color-note-yellow-border: #6B5A1F;
    --color-note-yellow-text: #D8CB8E;
    --color-note-blue-bg: #16324A;
    --color-note-blue-border: #2C5470;
    --color-note-blue-text: #9FC8E4;
    --color-note-blue-hover: #204864;
    --color-badge-bg: #F2EFE6;
    --color-badge-text: #17150F;
    --color-timeline-dot: #C9BE93;
    --color-timeline-line: #5C5636;
    --color-scope-dashed: #6B6455;
    --color-scope-alt-bg: #221F17;
    --color-footer-bg: #0D0B07;
    --color-footer-text: #F2EFE6;
    --color-footer-muted: #8A8370;
    --color-header-bg: rgba(23, 21, 15, 0.92);
    --color-card-bg: #1E1B14;
    --color-card-hover-bg: #2A2719;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-color-strong: rgba(0, 0, 0, 0.55);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
}

body {
  font-family: Pretendard, Archivo, system-ui, sans-serif;
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  line-height: 1.6;
}

a {
  color: var(--color-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-link-hover);
}

:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 3px;
}

html[data-motion="off"] *,
html[data-motion="off"] *::before,
html[data-motion="off"] *::after {
  transition: none !important;
  animation: none !important;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

.visually-hidden {
  position: absolute;
  left: -9999px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  padding: 10px 16px;
  font-size: 14px;
  border-radius: 0 0 8px 0;
  z-index: 99;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px 28px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-right: auto;
}

.brand-name {
  font-family: Pretendard, sans-serif;
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.brand-en {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.site-header nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.site-header nav a {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text);
  text-decoration: none;
  padding: 7px 12px;
  border-radius: 999px;
}

.site-header nav a:hover {
  background: var(--color-nav-hover-bg);
  color: var(--color-text);
}

#motion-toggle {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  border: none;
  border-radius: 999px;
  padding: 9px 14px;
  cursor: pointer;
  min-height: 36px;
}

/* Layout helpers */
main {
  max-width: none;
  padding: 0;
}

.section {
  border-top: 1px solid var(--color-border);
}

.section-alt {
  background: var(--color-bg-alt);
}

.section > h2,
.section-lead,
.strength-grid,
.timeline,
.more-grid,
.scope-grid {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
}

.section {
  padding: 0;
}

.section h2 {
  font-family: Pretendard, sans-serif;
  font-weight: 900;
  font-size: clamp(34px, 4.4vw, 60px);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  max-width: 20ch;
  padding: 56px 28px 0;
}

.section-lead {
  font-size: 17px;
  line-height: 1.6;
  max-width: 60ch;
  margin: 0 0 30px;
  padding: 0 28px;
  color: var(--color-text-muted-2);
}

/* Hero */
.hero {
  max-width: 1240px;
  margin: 0 auto;
  padding: 34px 28px 48px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  align-items: start;
}

.hero-copy {
  min-width: 0;
}

.hero-copy h1 {
  font-family: Pretendard, sans-serif;
  font-weight: 900;
  font-size: clamp(56px, 7vw, 104px);
  letter-spacing: -0.04em;
  margin: 10px 0 14px;
  line-height: 1.08;
}

.hero-lead {
  font-size: 19px;
  line-height: 1.6;
  max-width: 52ch;
  margin: 20px 0 0;
  text-wrap: pretty;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.btn {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--color-text);
  border: 2px solid var(--color-border-strong);
  border-radius: 6px;
  padding: 13px 18px;
  display: inline-block;
}

.btn-primary {
  background: var(--color-yellow);
  box-shadow: 4px 4px 0 var(--color-border-strong);
}

.btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-border-strong);
  color: var(--color-text);
}

.btn-outline {
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-nav-hover-bg);
  color: var(--color-text);
}

.hero-notes {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 26px;
}

.note {
  border-radius: 3px;
  box-shadow: 5px 6px 0 var(--shadow-color);
  max-width: 300px;
}

.note-yellow {
  background: var(--color-note-yellow-bg);
  border: 1px solid var(--color-note-yellow-border);
  padding: 34px 22px 38px;
  width: 308px;
  height: 173px;
  position: relative;
  transform: rotate(-1.4deg);
}

.note-pin {
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-link-hover);
  box-shadow: 0 3px 5px var(--shadow-color-strong), inset -2px -2px 0 rgba(0, 0, 0, 0.12);
}

.note-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-note-yellow-text);
  margin: 0 0 8px;
}

.note-text {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.5;
  margin: 12px 0 0;
}

.note-blue {
  background: var(--color-note-blue-bg);
  border: 1px solid var(--color-note-blue-border);
  padding: 30px 22px 34px;
  margin-left: auto;
  transform: rotate(1deg);
}

.note-blue label {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-note-blue-text);
  margin: 0 0 10px;
}

.note-blue textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  resize: vertical;
  font-family: Pretendard, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  min-height: 96px;
}

#memo-clear {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  background: transparent;
  border: 1px solid var(--color-note-blue-text);
  color: var(--color-note-blue-text);
  border-radius: 999px;
  padding: 7px 12px;
  margin-top: 10px;
  cursor: pointer;
  min-height: 32px;
}

#memo-clear:hover {
  background: var(--color-note-blue-hover);
}

/* Strength cards */
.strength-grid {
  padding: 56px 28px 64px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 18px;
}

.strength-intro {
  grid-column: 1;
  grid-row: 1;
}

.strength-intro h2 {
  padding: 0;
}

.strength-intro .section-lead {
  padding: 0;
  margin: 0;
  max-width: none;
}

.strength-card-1 {
  grid-column: 1;
  grid-row: 2;
}

.strength-card-2 {
  grid-column: 2;
  grid-row: 2;
}

.strength-card-3 {
  grid-column: 3;
  grid-row: 2;
}

@media (max-width: 900px) {
  .strength-grid {
    grid-template-columns: 1fr;
  }

  .strength-intro,
  .strength-card-1,
  .strength-card-2,
  .strength-card-3 {
    grid-column: 1;
    grid-row: auto;
  }
}

.strength-card {
  border: 2px solid var(--color-border-strong);
  border-radius: 10px;
  background: var(--color-card-bg);
  overflow: hidden;
}

.strength-card h3 {
  margin: 0;
}

.strength-toggle {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 22px 22px 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font: inherit;
  min-height: 44px;
  color: var(--color-text);
}

.strength-toggle:hover {
  background: var(--color-card-hover-bg);
}

.strength-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--color-badge-text);
  background: var(--color-badge-bg);
  border-radius: 999px;
  padding: 5px 10px;
  margin-top: 3px;
}

.strength-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.strength-sign {
  margin-left: auto;
  font-size: 22px;
  line-height: 1;
  color: var(--color-link-hover);
}

.strength-panel {
  margin: 0;
  padding: 0 22px 24px;
  display: grid;
  gap: 14px;
  border-top: 1px dashed var(--color-scope-dashed);
  padding-top: 18px;
}

.strength-panel[hidden] {
  display: none;
}

.strength-panel dt {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
  margin-bottom: 5px;
}

.strength-panel dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
}

.strength-panel dd.strong {
  font-weight: 700;
}

.strength-image-row {
  display: flex;
  justify-content: flex-end;
}

.strength-image-btn {
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-alt);
  border-radius: 6px;
  padding: 0;
  cursor: pointer;
  width: 132px;
  height: 86px;
  overflow: hidden;
  display: block;
  font: inherit;
}

.strength-image-btn:hover {
  border-color: var(--color-link-hover);
}

.strength-image-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  display: block;
}

/* Timeline */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0 28px 64px;
}

.timeline li {
  position: relative;
  padding-left: 40px;
  padding-bottom: 36px;
}

.timeline li.timeline-last {
  padding-bottom: 0;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-timeline-dot);
}

.timeline li:not(.timeline-last)::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: 0;
  width: 2px;
  background: var(--color-timeline-line);
}

.timeline-date {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--color-timeline-dot);
  margin: 0 0 6px;
}

.timeline h3 {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 7px;
}

.timeline ul {
  margin: 0;
  padding-left: 19px;
  display: grid;
  gap: 7px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-muted-2);
}

/* More section */
.more-grid {
  padding: 0 28px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 36px;
}

.more-grid h3 {
  font-family: Pretendard, sans-serif;
  font-weight: 900;
  font-size: clamp(26px, 2.8vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}

.likes-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.likes-list li {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
}

.likes-list svg {
  width: 52px;
  height: 52px;
}

.tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.tag-list li {
  font-family: "JetBrains Mono", monospace;
  font-size: 14px;
  border: 1.5px solid var(--color-border-strong);
  border-radius: 999px;
  padding: 8px 15px;
}

.plain-list {
  margin: 0;
  padding-left: 19px;
  display: grid;
  gap: 8px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-muted-2);
}

/* Scope */
.scope-grid {
  padding: 0 28px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.scope-card {
  border-radius: 10px;
  padding: 24px;
}

.scope-card h3 {
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 14px;
}

.scope-card ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 9px;
  font-size: 16px;
  line-height: 1.55;
}

.scope-public {
  border: 2px solid var(--color-border-strong);
  background: var(--color-bg-alt);
}

.scope-private {
  border: 2px dashed var(--color-scope-dashed);
  background: var(--color-scope-alt-bg);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(23, 21, 15, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
}

.lightbox[hidden] {
  display: none;
}

.lightbox-inner {
  background: var(--color-bg);
  border-radius: 12px;
  padding: 22px;
  max-width: 880px;
  width: 100%;
  max-height: 88vh;
  overflow: auto;
}

.lightbox-inner #lightbox-close {
  display: block;
  margin-left: auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  min-height: 40px;
  margin-bottom: 16px;
}

.lightbox-inner img {
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
  border: 1px solid var(--color-scope-dashed);
  border-radius: 8px;
  background: #fff;
  display: block;
}

/* Footer */
.site-footer {
  border-top: 2px solid var(--color-border-strong);
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 40px 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
  justify-content: space-between;
}

.footer-thanks {
  font-family: Pretendard, sans-serif;
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0;
}

.footer-meta {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-footer-muted);
  margin: 0;
}

/* Responsive */
@media (max-width: 780px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .note-yellow,
  .note-blue {
    width: auto;
    height: auto;
    margin-left: 0;
  }
}