:root {
  --paper: #101113;
  --paper-alt: #191b1f;
  --ink: #f5efe0;
  --ink-soft: #dedbd3;
  --ink-faint: #aaa69b;
  --line: #484941;
  --clearance: #f5efe0;
  --alert: #ff0000;
  --black: #17181b;
  --green: #11ff00;
  --mono: "JetBrains Mono", monospace;
  --sans: "IBM Plex Sans KR", sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-size: 64px 64px;
  background-position: -1px -1px;
  background-attachment: fixed;
  background-color: var(--paper);
  background-blend-mode: normal;
  position: relative;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgb(245 239 224 / 2%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(245 239 224 / 2%) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ---------- header ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgb(28 30 34 / 92%);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.case-id {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.case-id b {
  color: var(--ink);
}
nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
}
nav a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--ink-soft);
  text-transform: uppercase;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition:
    color 0.15s,
    border-color 0.15s;
}
nav a:hover,
nav a:focus-visible {
  color: var(--clearance);
  border-color: var(--clearance);
}

/* ---------- hero ---------- */
.stamp {
  position: absolute;
  top: 22px;
  right: 28px;
  border: 1.5px solid var(--clearance);
  color: var(--clearance);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 5px 10px;
  border-radius: 3px;
  transform: rotate(4deg);
  background: rgba(14, 110, 90, 0.05);
}
.hero {
  padding: 88px 32px 38px;
  position: relative;
  margin: 26px 0 24px;
  border: 1px solid var(--line) !important;
  border-radius: 6px;
  background:
    linear-gradient(135deg, rgb(245 239 224 / 5%), transparent 48%),
    var(--black);
  box-shadow: 0 14px 32px rgb(0 0 0 / 18%);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green);
  text-transform: uppercase;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  animation: textPulse 1.5s infinite;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 1.5s infinite;
}

.eyebrow::after {
  width: 16px;
  height: 16px;
  background: var(--green);
  position: absolute;
  margin-left: -4px;
  opacity: 0.4;
  animation: ping 1.5s infinite;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: start;
}
h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(38px, 5.2vw, 60px);
  letter-spacing: -0.01em;
  line-height: 1.08;
  margin-bottom: 10px;
}
.role {
  font-size: 19px;
  color: var(--ink-soft);
  font-weight: 500;
  margin-bottom: 22px;
}
.summary {
  font-size: 15.5px;
  color: var(--ink-soft);
  max-width: 52ch;
  margin-bottom: 32px;
}
.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 12px 20px;
  border-radius: 3px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition:
    transform 0.15s,
    box-shadow 0.15s;
}
.btn-primary {
  background: var(--ink);
  color: var(--black);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--line);
}
.btn-ghost {
  border: 1px solid var(--ink);
  color: var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--black);
}
.btn.btn-danger {
  border: 1px solid var(--alert) !important;
  background: #000 !important;
  color: var(--alert) !important;
}
.btn.btn-danger:hover,
.btn.btn-danger:focus-visible {
  background: #260000 !important;
  color: #ff4d4d !important;
  box-shadow: 0 0 0 2px rgb(255 0 0 / 20%);
}

.btn.btn-green {
  border: 1px solid var(--green) !important;
  background: #000 !important;
  color: var(--green) !important;
}
.btn.btn-green:hover,
.btn.btn-green:focus-visible {
  background: #0b2600 !important;
  color: rgb(6, 214, 6) !important;
  box-shadow: 0 0 0 2px rgba(115, 238, 152, 0.2);
}

/* ---------- flashcards ---------- */
.flashcard-page {
  padding-top: 42px;
  padding-bottom: 64px;
}
.flashcard-upload,
.flashcard-deck {
  border: 1px solid var(--line);
  background: var(--paper-alt);
  padding: 20px;
  border-radius: 4px;
  margin: 24px 0;
}
.flashcard-upload {
  display: flex;
  align-items: end;
  gap: 16px;
  flex-wrap: wrap;
}
.flashcard-upload label {
  font: 12px var(--mono);
  color: var(--ink-soft);
  display: grid;
  gap: 8px;
}
.flashcard-upload input {
  color: var(--ink);
  font: 13px var(--mono);
}
.flashcard-deck {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.flashcard-deck h2 {
  font-family: var(--mono);
  margin: 4px 0;
  font-size: 20px;
}
.flashcard-deck p {
  color: var(--ink-faint);
  font-size: 13px;
}
.flashcard-deck .deck-progress {
  color: var(--green);
  margin-bottom: 5px;
}
.flashcard-deck-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}
.flashcard-deck-actions form {
  margin: 0;
}
.study-area {
  max-width: 760px;
  margin: 24px auto;
}
.study-filter {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}
.study-filter .is-active {
  background: var(--ink);
  color: var(--black);
}
.study-card {
  display: block;
  width: 100%;
  min-height: 330px;
  padding: 34px;
  color: var(--ink);
  background: var(--black);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
}
.study-card.is-answer {
  border-color: var(--green);
}
.study-card.is-known {
  box-shadow: inset 0 0 0 1px rgb(17 255 0 / 30%);
}
.study-card > span,
.study-card small {
  display: block;
  font: 12px var(--mono);
  color: var(--green);
  letter-spacing: 0.08em;
}
.study-card small {
  color: var(--ink-faint);
  margin-top: 26px;
}
.study-card-content {
  font-size: 22px;
  margin-top: 38px;
  overflow-wrap: anywhere;
}
.study-card-content table {
  max-width: 100%;
  border-collapse: collapse;
}
.study-card-content td,
.study-card-content th {
  border: 1px solid var(--line);
  padding: 8px;
}
.study-controls,
.study-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
}
.study-controls span,
.study-status span {
  font: 13px var(--mono);
}
.study-status {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}
.study-status span {
  color: var(--ink-soft);
}

.admin-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-logout {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.post-item:not([data-editable]) {
  cursor: default;
  grid-template-columns: 92px minmax(0, 1fr) auto;
}

.login-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-card {
  display: grid;
  width: min(100%, 390px);
  gap: 16px;
  padding: 30px;
  border: 1px solid rgb(245 239 224 / 35%);
  background: #202020;
}

.login-card > p {
  color: var(--alert);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.login-card h1 {
  font-size: 28px;
}

.login-card label {
  display: grid;
  gap: 7px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
}

.login-card input {
  border: 1px solid rgb(245 239 224 / 35%);
  padding: 11px 12px;
  background: #171717;
  color: var(--ink);
  font: inherit;
}

.login-error {
  padding: 10px;
  border: 1px solid var(--alert);
  color: var(--alert);
  font-size: 13px;
}

.file-card {
  background: var(--black);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 22px 24px;
  box-shadow:
    6px 6px 0 var(--paper-alt),
    6px 6px 0 1px var(--line);
}
.file-card-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-transform: uppercase;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 10px;
  margin-bottom: 14px;
}
.meta-row {
  display: flex;
  justify-content: space-between;
  padding: 9px 0;
  border-bottom: 1px solid var(--paper);
  font-size: 13.5px;
}

.meta-row-syslog {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1px 0;
  border-bottom: 1px solid var(--paper);
  font-size: 13.5px;
}

.meta-row-syslog a {
  flex: 1;
}

.meta-key-syslog {
  width: 180px;
  font-family: var(--mono);
  color: var(--ink-faint);
}

.meta-row:last-child {
  border-bottom: none;
}
.meta-key {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 12px;
}
.meta-val {
  font-weight: 600;
  text-align: right;
}
.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}
.stat {
  text-align: center;
  padding: 10px 4px;
  background: var(--paper);
  border-radius: 3px;
}
.stat-num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--clearance);
}
.stat-label {
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  margin-top: 2px;
}

.stat-num a {
  color: inherit;
  text-decoration: none;
  position: relative;
}

.stat-num a::after {
  color: var(--green);
  content: "Check Badge";
  position: absolute;
  left: 45%;
  top: 125%;
  transform: translateX(-50%);
  font-size: 11px;
  font-weight: normal;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.stat-num a:hover::after {
  opacity: 1;
}

/* ---------- section shell ---------- */
section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}
.wrap > section:not(.hero) {
  position: relative;
  margin: 24px 0;
  padding: 38px 32px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: linear-gradient(black), var(--paper-alt);
  box-shadow: 0 12px 28px rgb(0 0 0 / 14%);
}
.wrap > section:not(.hero)::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 24px;
  width: 56px;
  height: 2px;
  background: var(--clearance);
}
#contact {
  padding: 0 !important;
  border: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}
#contact::before {
  display: none;
}
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 36px;
}
.sec-num {
  font-family: var(--mono);
  color: var(--ink-faint);
  font-size: 13px;
}
.sec-title {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}
.sec-title::after {
  content: "";
  display: block;
  height: 1px;
  background: rgb(245 239 224 / 36%);
  margin-top: 12px;
  width: 100%;
}
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- about ---------- */
.about-body {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 68ch;
}
.about-body strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- capabilities ---------- */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cap-card {
  background: var(--black);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 20px;
  transition:
    border-color 0.15s,
    transform 0.15s;
}
.cap-card:hover {
  border-color: var(--clearance);
  transform: translateY(-3px);
}
.cap-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.cap-title {
  font-weight: 600;
  font-size: 15px;
}
.cap-idx {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-family: var(--mono);
  font-size: 11px;
  padding: 3px 8px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--ink-soft);
}

/* ---------- findings (projects) ---------- */
.finding {
  background: var(--black);
  border: 1px solid var(--line);
  border-radius: 4px;
  margin-bottom: 16px;
  overflow: hidden;
}
.finding-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  gap: 16px;
  flex-wrap: wrap;
}
.finding-left {
  display: flex;
  align-items: center;
  gap: 14px;
}
.finding-id {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
}
.finding-title {
  font-weight: 700;
  font-size: 17px;
}
.sev {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 9px;
  border-radius: 3px;
  text-transform: uppercase;
  black-space: nowrap;
}
.sev-high {
  background: rgba(181, 69, 11, 0.12);
  color: var(--alert);
}
.sev-med {
  background: rgba(14, 110, 90, 0.12);
  color: var(--clearance);
}

.finding-body {
  padding: 0 22px 20px;
}
.redact-wrap {
  position: relative;
  border-radius: 3px;
  overflow: hidden;
  cursor: pointer;
}
.redact-text {
  padding: 14px;
  font-size: 14px;
  color: var(--ink-soft);
}
.redact-bar {
  position: absolute;
  inset: 0;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s cubic-bezier(0.65, 0, 0.35, 1);
  transform-origin: left;
}
.redact-bar span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--paper);
  letter-spacing: 0.15em;
}
.redact-wrap:hover .redact-bar,
.redact-wrap:focus-within .redact-bar {
  transform: scaleX(0);
}
.finding-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

/* ---------- appendix (education/certs) ---------- */
.appendix-list {
  border-top: 1px dashed var(--line);
}
.appendix-item {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: 18px;
  padding: 16px 4px;
  border-bottom: 1px dashed var(--line);
  align-items: center;
}
.appendix-date {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-faint);
}
.appendix-name {
  font-weight: 500;
  font-size: 14.5px;
}
.appendix-org {
  font-size: 12.5px;
  color: var(--ink-faint);
}
.appendix-tag {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--clearance);
  text-align: right;
}

/* ---------- learning log ---------- */
.learning-head {
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.learning-category-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.learning-category-form input,
.learning-editor input,
.learning-editor textarea {
  border: 1px solid rgb(245 239 224 / 35%);
  background: #171717;
  color: var(--ink);
  padding: 10px 12px;
  font: inherit;
}
.learning-category-form input {
  min-width: 210px;
}
.learning-category-form .btn {
  padding: 10px 14px;
}
.learning-intro {
  color: var(--ink-faint);
  font-size: 14px;
  margin: -18px 0 22px;
}
.learning-tabs,
.learning-entry-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}
.learning-tab {
  flex: 0 0 auto;
  border: 1px solid rgb(245 239 224 / 30%);
  background: transparent;
  color: var(--ink-faint);
  padding: 9px 13px;
  cursor: pointer;
  font: 11px var(--mono);
}
.learning-tab:hover,
.learning-tab.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--black);
}
.learning-category-panels {
  margin-top: 14px;
}
.learning-category-card {
  border: 1px solid rgb(245 239 224 / 30%);
  background: rgb(0 0 0 / 20%);
  padding: 18px;
}
.learning-category-panel,
.learning-entry-panel {
  display: none;
}
.learning-category-panel.is-active,
.learning-entry-panel.is-active {
  display: block;
}
.learning-category-title-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 12px;
}
.learning-category-title {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}
.learning-category-title:hover,
.learning-open-link:hover {
  color: var(--clearance);
  text-decoration: underline;
}
.learning-category-title-row span,
.learning-entry-date,
.learning-open-link {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
}
.learning-entry-list {
  height: 206px;
  overflow-y: auto;
  border-top: 1px dashed rgb(245 239 224 / 30%);
  scrollbar-color: var(--ink-faint) var(--black);
  scrollbar-width: thin;
}
.learning-entry-preview {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed rgb(245 239 224 / 20%);
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 13px;
}
.learning-entry-preview:hover {
  color: var(--green);
}
.learning-entry-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.learning-empty {
  color: var(--ink-faint);
  font-size: 13px;
  padding: 14px 0;
}
.learning-open-link {
  display: block;
  margin-top: 14px;
  text-align: right;
  text-decoration: none;
}
.learning-empty-state {
  padding: 22px;
  border: 1px dashed rgb(245 239 224 / 35%);
  color: var(--ink-faint);
  font-size: 14px;
}
.learning-board-page {
  padding-top: 62px;
  padding-bottom: 80px;
}
.board-back {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
}
.learning-board-header {
  position: static;
  margin: 28px 0;
  background: transparent;
  border: 0;
}
.learning-board-header h1 {
  margin: 6px 0;
}
.learning-board-header p,
.learning-flash {
  color: var(--ink-faint);
}
.learning-flash {
  border: 1px solid var(--alert);
  padding: 10px;
  margin-bottom: 16px;
}
.learning-editor {
  display: grid;
  gap: 12px;
  padding: 20px;
  border: 1px solid rgb(245 239 224 / 30%);
  margin-bottom: 28px;
}
.learning-editor h2 {
  font: 700 15px var(--mono);
}
.learning-editor label {
  display: grid;
  gap: 6px;
  color: var(--ink-faint);
  font: 11px var(--mono);
}
.learning-editor textarea {
  min-height: 150px;
  resize: vertical;
}
.learning-editor .btn {
  justify-self: start;
}
.learning-entry-navigation {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  padding: 12px;
  border: 1px solid rgb(245 239 224 / 24%);
  background: rgb(0 0 0 / 16%);
}
.entry-jump-label {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-faint);
  font: 10px var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.entry-jump-select {
  min-width: 0;
  max-width: 440px;
  flex: 1;
  border: 1px solid rgb(245 239 224 / 35%);
  background: #111214;
  color: var(--ink);
  padding: 8px 10px;
  font: 12px var(--mono);
}
.learning-board-list {
  display: block;
}
.learning-board-entry {
  border: 1px solid rgb(245 239 224 / 30%);
  padding: 20px;
}
.learning-board-entry-meta {
  color: var(--ink-faint);
  font: 11px var(--mono);
}
.learning-board-entry h2 {
  margin: 5px 0 12px;
  font-size: 19px;
}
.learning-entry-content {
  color: var(--ink-soft);
  overflow-x: auto;
}
.learning-entry-content div,
.learning-entry-content p {
  margin-bottom: 10px;
}
.learning-entry-content h1,
.learning-entry-content h2,
.learning-entry-content h3,
.learning-entry-content h4 {
  margin: 20px 0 10px;
  font-family: var(--mono);
  line-height: 1.35;
}
.learning-entry-content h1 {
  font-size: 25px;
}
.learning-entry-content h2 {
  font-size: 21px;
}
.learning-entry-content h3 {
  font-size: 18px;
}
.learning-entry-content h4 {
  font-size: 16px;
}
.learning-entry-content ul,
.learning-entry-content ol {
  margin: 10px 0 14px 24px;
}
.learning-entry-content blockquote {
  margin: 14px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--clearance);
  background: rgb(245 239 224 / 5%);
  color: var(--ink-soft);
}
.learning-entry-content pre {
  margin: 14px 0;
  padding: 14px;
  overflow-x: auto;
  background: #090a0c;
  border: 1px solid var(--line);
  color: #d9e8d8;
  font: 12px/1.6 var(--mono);
  white-space: pre;
}
.learning-entry-content code {
  padding: 1px 4px;
  background: rgb(245 239 224 / 9%);
  font: 0.9em var(--mono);
}
.learning-entry-content pre code {
  padding: 0;
  background: transparent;
  font: inherit;
}
.learning-entry-content table {
  width: 100%;
  margin: 14px 0;
  border-collapse: collapse;
  font-size: 13px;
}
.learning-entry-content th,
.learning-entry-content td {
  padding: 9px 11px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.learning-entry-content th {
  background: rgb(245 239 224 / 9%);
  font-family: var(--mono);
}
.learning-entry-content a {
  color: var(--clearance);
  text-underline-offset: 3px;
}
.rich-toolbar {
  display: flex;
  align-items: center;
  gap: 5px;
}
.rich-toolbar button {
  min-width: 30px;
  border: 1px solid rgb(245 239 224 / 35%);
  background: #242424;
  color: var(--ink);
  padding: 4px 7px;
  cursor: pointer;
}
.rich-color {
  display: flex !important;
  align-items: center;
  grid-template-columns: none !important;
  gap: 5px !important;
}
.rich-color input {
  width: 28px;
  height: 26px;
  padding: 2px;
  cursor: pointer;
}
.rich-bg-color {
  display: flex !important;
  align-items: center;
  grid-template-columns: none !important;
  gap: 5px !important;
}
.rich-bg-color input {
  width: 28px;
  height: 26px;
  padding: 2px;
  cursor: pointer;
}

.rich-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.rich-font-size {
  height: 34px;
  padding: 0 8px;
  border: 1px solid rgba(245, 239, 224, 0.25);
  border-radius: 4px;
  background: transparent;
  color: #f5efe0;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  cursor: pointer;
}

.rich-font-size option {
  background: #1a1a1a;
  color: #f5efe0;
}

.rich-editor {
  min-height: 150px;
  border: 1px solid rgb(245 239 224 / 35%);
  background: #171717;
  color: var(--ink);
  padding: 10px 12px;
  font: 14px/1.6 var(--sans);
  overflow-x: auto;
}
.rich-editor pre {
  padding: 10px;
  background: #090a0c;
  font: 12px/1.6 var(--mono);
  white-space: pre;
}
.rich-editor table {
  border-collapse: collapse;
}
.rich-editor td,
.rich-editor th {
  padding: 6px;
  border: 1px solid var(--line);
}
.rich-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--ink-faint);
}
.learning-edit-details {
  margin-top: 18px;
  color: var(--ink-faint);
  font: 11px var(--mono);
}
.learning-edit-details summary {
  cursor: pointer;
  list-style: none;
}
.learning-edit-details summary::-webkit-details-marker {
  display: none;
}
.learning-editor.compact {
  margin: 10px 0 0;
  padding: 14px;
}
.learning-delete-form,
.learning-delete-category {
  margin-top: 12px;
}

/* ---------- visitor dashboard ---------- */
.visitor-dashboard {
  padding-top: 62px;
  padding-bottom: 80px;
}
.dashboard-links {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.visitor-dashboard-header {
  position: static;
  margin: 28px 0;
  background: transparent;
  border: 0;
}
.visitor-dashboard-header h1 {
  margin: 6px 0;
}
.visitor-dashboard-header p {
  color: var(--ink-faint);
}
.visitor-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
.visitor-summary-card,
.visitor-filter-card,
.visitor-table-card {
  border: 1px solid rgb(245 239 224 / 30%);
  background: rgb(0 0 0 / 20%);
}
.visitor-summary-card {
  display: grid;
  gap: 3px;
  padding: 16px;
}
.visitor-summary-card span,
.visitor-summary-card small {
  color: var(--ink-faint);
  font: 10px var(--mono);
  letter-spacing: 0.07em;
}
.visitor-summary-card strong {
  color: var(--clearance);
  font: 700 27px var(--mono);
}
.visitor-filter-card {
  padding: 16px;
  margin-bottom: 18px;
}
.visitor-date-form {
  display: flex;
  gap: 9px;
  align-items: center;
  flex-wrap: wrap;
}
.visitor-date-form label {
  color: var(--ink-faint);
  font: 11px var(--mono);
}
.visitor-date-form input {
  border: 1px solid rgb(245 239 224 / 35%);
  background: #171717;
  color: var(--ink);
  padding: 10px;
  font: 12px var(--mono);
}
.visitor-date-form .btn {
  padding: 10px 14px;
}
.visitor-date-tabs {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  margin-top: 14px;
  padding-bottom: 2px;
}
.visitor-date-tabs .learning-tab {
  text-decoration: none;
}
.visitor-table-card {
  overflow: hidden;
}
.visitor-table-head,
.visitor-table-row {
  display: grid;
  grid-template-columns: 1.1fr 0.7fr 1fr 1.5fr;
  gap: 16px;
  padding: 14px 16px;
  align-items: start;
}
.visitor-table-head {
  background: #242424;
  border-bottom: 1px solid rgb(245 239 224 / 25%);
  color: var(--ink-faint);
  font: 10px var(--mono);
  letter-spacing: 0.08em;
}
.visitor-table-body {
  max-height: 650px;
  overflow-y: auto;
  scrollbar-color: var(--ink-faint) var(--black);
  scrollbar-width: thin;
}
.visitor-table-row {
  border-bottom: 1px solid rgb(245 239 224 / 13%);
  color: var(--ink-soft);
  font-size: 13px;
}
.visitor-table-row:last-child {
  border-bottom: 0;
}
.visitor-time-ip {
  display: grid;
  gap: 3px;
}
.visitor-time-ip time,
.visitor-time-ip code,
.visitor-page,
.visitor-client span,
.visitor-table-row small {
  color: var(--ink-faint);
  font: 11px var(--mono);
}
.visitor-time-ip code {
  color: var(--clearance);
}
.visitor-table-row small {
  display: block;
  margin-top: 5px;
}
.visitor-type {
  display: inline-block;
  min-width: 52px;
  padding: 3px 7px;
  font: 700 10px var(--mono);
  text-align: center;
}
.visitor-type.is-person {
  background: rgb(14 110 90 / 35%);
  color: #73e2c1;
}
.visitor-type.is-bot {
  background: rgb(181 69 11 / 35%);
  color: #ffb78b;
}
.visitor-client {
  display: grid;
  gap: 3px;
}
.visitor-client strong {
  font-size: 13px;
}
.visitor-client details {
  margin-top: 5px;
}
.visitor-client summary {
  color: var(--ink-faint);
  cursor: pointer;
  font: 10px var(--mono);
}
.visitor-client details code {
  display: block;
  max-height: 72px;
  overflow: auto;
  margin-top: 6px;
  padding: 7px;
  background: #171717;
  color: var(--ink-faint);
  font: 10px/1.45 var(--mono);
  overflow-wrap: anywhere;
}
.visitor-log-empty,
.visitor-no-dates {
  padding: 20px;
  color: var(--ink-faint);
  font: 12px var(--mono);
}
.security-section {
  margin-top: 18px;
}
.security-section-title {
  padding: 14px 16px;
  border-bottom: 1px solid rgb(245 239 224 / 25%);
  color: var(--ink);
  font: 700 12px var(--mono);
  letter-spacing: 0.08em;
}
.security-blocked-head,
.security-blocked-row {
  grid-template-columns: 1fr 1.3fr 1fr auto;
}
.security-attempt-head,
.security-attempt-row {
  grid-template-columns: 1.3fr 0.7fr 1fr;
}
.security-blocked-row form {
  margin: 0;
}
.security-blocked-row .btn {
  padding: 8px 12px;
}

/* ---------- visitor log ---------- */
.visitor-log {
  max-height: 178px;
  overflow-y: auto;
  border: 1px solid rgb(245 239 224 / 30%);
  background: rgb(0 0 0 / 20%);
  font-family: var(--mono);
  scrollbar-color: var(--ink-faint) var(--black);
  scrollbar-width: thin;
}

.visitor-log::-webkit-scrollbar {
  width: 6px;
}

.visitor-log::-webkit-scrollbar-thumb {
  border-radius: 10px;
  background: var(--ink-faint);
}

.visitor-log::-webkit-scrollbar-track {
  background: var(--black);
}

.visitor-log-head,
.visitor-row {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(130px, 0.8fr);
  gap: 20px;
  align-items: center;
  padding: 13px 16px;
}

.visitor-log-head {
  position: sticky;
  top: 0;
  z-index: 1;
  border-bottom: 1px solid rgb(245 239 224 / 30%);
  background: #1a1a1a;
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.visitor-row {
  border-bottom: 1px solid rgb(245 239 224 / 13%);
  color: var(--ink-soft);
  font-size: 12px;
}

.visitor-row:last-child {
  border-bottom: 0;
}

.visitor-row span {
  color: var(--clearance);
}

.visitor-empty {
  display: block;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}

/* ---------- contact ---------- */
.contact-box {
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  padding: 44px 40px;
  text-align: left;
}
.contact-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  color: #000000;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.contact-box h2 {
  font-family: var(--mono);
  font-size: 26px;
  margin-bottom: 16px;
  line-height: 1.3;
}
.contact-box p {
  color: #2bee34;
  max-width: 52ch;
  margin-bottom: 26px;
  font-size: 14.5px;
}
.term-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.term-line {
  font-family: var(--mono);
  font-size: 14px;
}
.term-line a {
  color: black;
  text-decoration: none;
  text-decoration: underline;
}
.term-line a:hover {
  padding: 4px 8px;
  border-radius: 3px;
  background: var(--paper);
  border-color: #ffffff;
  color: white;
}

footer {
  text-align: center;
  padding: 32px 0 48px;
}
footer p {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}

@media (max-width: 840px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .cap-grid {
    grid-template-columns: 1fr 1fr;
  }
  nav ul {
    gap: 16px;
  }
  .appendix-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .appendix-tag {
    text-align: left;
  }
}
@media (max-width: 560px) {
  .cap-grid {
    grid-template-columns: 1fr;
  }
  nav ul {
    display: none;
  }
  .stamp {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- syslog ---------- */
#syslog {
  margin-top: 24px;
}

#syslog h2 {
  font-size: 2rem;
  margin-bottom: 6px;
}

#syslog h5 {
  color: var(--ink-faint);
  font: 11px var(--mono);
  font-weight: 400;
}
.commit-date-tabs {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  margin: 18px 0 14px;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

#commit-list {
  list-style: none;
  display: grid;
  gap: 10px;

  max-height: 420px;
  overflow-y: auto;
  padding-right: 10px;
}

#commit-list li {
  background: var(--black);
  border: 1px solid var(--line);
  border-radius: 4px;

  padding: 12px 16px;
  box-shadow:
    4px 4px 0 var(--paper-alt),
    4px 4px 0 1px var(--line);
  transition: 0.2s;
}

#commit-list li:hover {
  transform: translateY(-3px);
}

#commit-list a:hover {
  transform: translateY(-3px);
  color: #2bee34;
}

#commit-list a {
  text-align: left;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;

  text-decoration: none;
  color: var(--ink-faint);

  text-transform: uppercase;

  border-bottom: 0;

  padding-bottom: 0;
  margin-bottom: 0;
}

#commit-list::-webkit-scrollbar {
  width: 6px;
}

#commit-list::-webkit-scrollbar-thumb {
  background: var(--ink);
  border-radius: 10px;
}

#commit-list::-webkit-scrollbar-track {
  background: black;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #2bee34;
  border-radius: 50%;
  margin-right: 10px;
  position: relative;
  animation: pulse 1.5s infinite;
}

.status-dot::after {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #2bee34;
  opacity: 0.4;
  animation: ping 1.5s infinite;
}

/* ---------- write modal ---------- */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  place-items: center;
  padding: 24px;
  background: rgb(0 0 0 / 78%);
  backdrop-filter: blur(7px);
}

.modal.is-open {
  display: grid;
}

.modal-content {
  width: min(100%, 560px);
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 30px;
  background-color: #202020;
  background-image:
    linear-gradient(rgb(245 239 224 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(245 239 224 / 4%) 1px, transparent 1px);
  background-size: 28px 28px;
  resize: none;
  color: var(--ink);
  border: 1px solid #77736a;
  border-radius: 2px;
  box-shadow: 0 24px 80px rgb(0 0 0 / 55%);
  position: relative;
}

.modal-content::before {
  content: "CLASSIFIED / PERSONAL LOG";
  position: absolute;
  top: 12px;
  right: 16px;
  color: rgb(245 239 224 / 28%);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.modal-head,
.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-head {
  margin-bottom: 18px;
  padding-bottom: 17px;
  border-bottom: 1px solid rgb(245 239 224 / 24%);
}

.modal-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 5px;
  color: var(--alert);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.modal-eyebrow span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--alert);
  box-shadow: 0 0 0 4px rgb(255 0 0 / 15%);
}

.modal-content h2 {
  font-family: var(--mono);
  font-size: 25px;
  letter-spacing: -0.04em;
}

.modal-close {
  width: 34px;
  height: 34px;
  border: 1px solid rgb(245 239 224 / 45%);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 25px;
  line-height: 1;
}

.modal-close:hover {
  background: var(--ink);
  color: var(--black);
}

.modal-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 26px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.write-form {
  display: grid;
  gap: 22px;
}

.write-form label {
  display: grid;
  gap: 9px;
}

.field-label {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.write-form input,
.write-form textarea {
  width: 100%;
  display: block;
  border: 1px solid rgb(245 239 224 / 35%);
  border-radius: 0;
  padding: 13px 14px;
  background: rgb(0 0 0 / 32%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: normal;
}

.write-form textarea {
  min-height: 180px;
  resize: vertical;
}

.write-form input:focus,
.write-form textarea:focus {
  outline: 1px solid var(--ink);
  border-color: var(--ink);
}

.modal-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 12px;
  margin-top: 2px;
  padding-top: 22px;
  border-top: 1px solid rgb(245 239 224 / 20%);
}

.modal-actions .btn {
  justify-content: center;
  min-height: 46px;
  padding: 12px 16px;
}

.modal-note {
  margin-top: 18px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.03em;
}

@media (max-width: 520px) {
  .modal {
    padding: 12px;
  }

  .modal-content {
    max-height: calc(100vh - 24px);
    padding: 24px 20px;
  }

  .modal-content::before,
  .modal-meta span:first-child {
    display: none;
  }

  .modal-actions {
    grid-template-columns: 1fr;
  }

  .modal-actions .btn:first-child {
    order: 2;
  }
}

/* ---------- personal log post list ---------- */
.hero-posts {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgb(0 0 0 / 20%);
  overflow: hidden;
}

.hero-posts-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid rgb(245 239 224 / 30%);
  background: #1a1a1a;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.09em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

/* 게시글 5개 높이만큼만 보이고 이후엔 스크롤 */
.post-list {
  --post-row-h: 54px;
  max-height: calc(var(--post-row-h) * 5);
  overflow-y: auto;
  scrollbar-color: var(--ink-faint) var(--black);
  scrollbar-width: thin;
}
.post-list::-webkit-scrollbar {
  width: 6px;
}
.post-list::-webkit-scrollbar-thumb {
  background: var(--ink-faint);
  border-radius: 10px;
}
.post-list::-webkit-scrollbar-track {
  background: var(--black);
}

.post-item {
  width: 100%;
  min-height: var(--post-row-h, 54px);
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border: 0;
  border-bottom: 1px solid rgb(245 239 224 / 13%);
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}
.post-item:not([data-editable]) {
  cursor: default;
  grid-template-columns: 92px minmax(0, 1fr) auto;
}
.post-item:last-child {
  border-bottom: 0;
}
.post-item:hover,
.post-item:focus-visible {
  background: rgb(245 239 224 / 5%);
  outline: none;
}

.post-item-id {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.post-item-title {
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.post-item-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}
.post-item-edit {
  opacity: 0;
  transition: opacity 0.3s ease;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: #2bee34;
  white-space: nowrap;
}

.post-item:hover .post-item-edit {
  opacity: 1;
}

.post-empty {
  padding: 26px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}
.post-empty-button {
  font-family: var(--mono);
  font-size: 11px;
  color: #2bee34;
  text-decoration: none;
  border-bottom: 1px solid #2bee34;
  white-space: nowrap;
}
.post-empty-button:hover {
  color: #fff;
  border-color: #fff;
}

@media (max-width: 560px) {
  .wrap {
    padding: 0 16px;
  }
  .hero {
    margin-top: 16px;
    padding: 72px 20px 28px;
  }
  .wrap > section:not(.hero) {
    margin: 16px 0;
    padding: 28px 20px;
  }
  .visitor-summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .visitor-table-head {
    display: none;
  }
  .visitor-table-row {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .visitor-client {
    grid-column: 1 / -1;
  }
  .security-blocked-head,
  .security-attempt-head {
    display: none;
  }
  .security-blocked-row,
  .security-attempt-row {
    grid-template-columns: 1fr 1fr;
  }
  .security-blocked-row form {
    grid-column: 1 / -1;
  }
  .learning-category-form {
    width: 100%;
  }
  .learning-category-form input {
    min-width: 0;
    flex: 1;
  }
  .learning-entry-preview {
    grid-template-columns: 78px minmax(0, 1fr);
  }
  .entry-jump-label {
    display: grid;
    gap: 6px;
  }
  .entry-jump-select {
    max-width: none;
    width: 100%;
  }
  .post-item,
  .post-item:not([data-editable]) {
    grid-template-columns: 1fr auto;
    row-gap: 4px;
  }
  .post-item-id,
  .post-item-date {
    display: none;
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

@keyframes ping {
  0% {
    transform: scale(0.8);
    opacity: 0.5;
  }

  100% {
    transform: scale(1.8);
    opacity: 0;
  }
}

@keyframes textPulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.6;
  }
}

/* Flashcard pages: compact, touch-friendly layout for phones. */
@media (max-width: 700px) {
  .flashcard-page {
    padding-top: 24px;
    padding-bottom: 40px;
  }

  .flashcard-page .board-back {
    display: inline-block;
    margin-bottom: 22px;
  }

  .flashcard-page .learning-board-header h1 {
    font-size: clamp(28px, 9vw, 40px);
    overflow-wrap: anywhere;
  }

  .flashcard-page .learning-board-header p {
    font-size: 14px;
    line-height: 1.65;
  }

  .flashcard-upload,
  .flashcard-deck {
    padding: 16px;
    margin: 16px 0;
  }

  .flashcard-upload {
    align-items: stretch;
  }

  .flashcard-upload label,
  .flashcard-upload input {
    width: 100%;
  }

  .flashcard-upload .btn {
    justify-content: center;
    width: 100%;
  }

  .flashcard-deck {
    align-items: stretch;
    flex-direction: column;
    gap: 14px;
  }

  .flashcard-deck h2 {
    font-size: 17px;
    overflow-wrap: anywhere;
  }

  .flashcard-deck-actions {
    width: 100%;
  }

  .flashcard-deck-actions .btn {
    justify-content: center;
    flex: 1;
    padding: 11px 12px;
  }

  .flashcard-deck-actions form {
    flex: 1;
  }

  .flashcard-deck-actions form .btn {
    width: 100%;
  }

  .study-area {
    margin: 18px 0;
  }

  .study-filter {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 10px;
  }

  .study-filter .btn {
    justify-content: center;
    min-height: 44px;
    padding: 10px 8px;
    font-size: 11px;
  }

  .study-card {
    min-height: min(54vh, 330px);
    padding: 22px 18px;
  }

  .study-card-answer {
    min-height: min(54vh, 130px);
    padding: 22px 18px;
  }

  .study-card-content {
    font-size: clamp(18px, 5.5vw, 22px);
    line-height: 1.55;
    margin-top: 26px;
  }

  .study-card-content img {
    display: block;
    width: auto;
    max-width: 100%;
    max-height: 42vh;
    margin: 0 auto;
    object-fit: contain;
  }

  .study-card-content audio {
    width: 100%;
    max-width: 100%;
  }

  .study-card-content table {
    display: block;
    overflow-x: auto;
    font-size: 15px;
  }

  .study-controls {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 8px;
  }

  .study-controls .btn {
    justify-content: center;
    min-height: 44px;
    padding: 10px 8px;
    font-size: 11px;
  }

  .study-controls span {
    font-size: 10px;
    text-align: center;
    white-space: nowrap;
  }

  .study-status {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .study-status .btn {
    justify-content: center;
    min-height: 46px;
    width: 100%;
  }
}

@media (max-width: 380px) {
  .study-controls {
    grid-template-columns: 1fr 1fr;
  }

  .study-controls span {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  .study-controls .btn {
    grid-row: 2;
  }
}

/* 전체 문제 / 모르는 문제 탭 버튼 */
.study-filter {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.study-filter .btn {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--border, #2a2a2a);
  background: transparent;
  color: var(--muted, #888);
  transition:
    border-color 0.15s,
    color 0.15s,
    background 0.15s;
}
.study-filter .btn:hover {
  border-color: var(--fg, #ddd);
  color: var(--fg, #ddd);
}
.study-filter .btn.is-active {
  background: var(--fg, #f4f4f4);
  color: var(--bg, #0b0b0b);
  border-color: var(--fg, #f4f4f4);
}

/* 문제 선택 목록 (card-picker) */
.card-picker {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: calc(5 * 44px + 4 * 6px); /* 아이템 5개 높이 */
  overflow-y: auto;
  padding-right: 4px; /* 스크롤바가 내용 가리지 않게 여유 */
  scrollbar-width: thin;
}

.card-picker-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border, #2a2a2a);
  border-left: 3px solid var(--border, #2a2a2a);
  border-radius: 4px;
  background: var(--panel, #111);
  text-align: left;
  cursor: pointer;
  transition:
    border-color 0.15s,
    background 0.15s,
    transform 0.1s;
}
.card-picker-item:hover {
  background: var(--panel-hover, #1a1a1a);
  transform: translateX(2px);
}
.card-picker-item span {
  flex: 0 0 auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 3px;
  color: var(--bg, #0b0b0b);
}
.card-picker-item strong {
  font-weight: 400;
  font-size: 0.92rem;
  color: var(--fg, #ddd);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 상태별 색상 구분 — REVIEW는 다시 볼 문제라 경고색, KNOWN은 초록, NOW는 강조색 */
.card-picker-item[data-status="now"] {
  border-left-color: var(--accent, #00d5ff);
  color: var(--accent, #00d5ff);
}
.card-picker-item[data-status="now"] span {
  background: var(--bg, #0b0b0b);
  color: var(--accent, #00d5ff);
  border: 1px solid var(--accent, #00d5ff);
}

.card-picker-item[data-status="fail"] {
  border-left-color: var(--alert, #ff0000);
  color: var(--alert, #ff0000);
}
.card-picker-item[data-status="fail"] span {
  background: var(--bg, #0b0b0b);
  color: var(--alert, #ff0000);
  border: 1px solid var(--alert, #ff0000);
}

.card-picker-item[data-status="pass"] {
  border-left-color: var(--green, #11ff00);
  color: var(--green, #11ff00);
}
.card-picker-item[data-status="pass"] span {
  background: var(--bg, #0b0b0b);
  color: var(--green, #11ff00);
  border: 1px solid var(--green, #11ff00);
}

.card-picker-item[data-status="new"] {
  border-left-color: var(--border, #333);
  color: var(--border, #333);
}
.card-picker-item[data-status="new"] span {
  background: var(--bg, #0b0b0b);
  color: white;
  border: 1px solid var(--border, #333);
}

.deck-title-link {
  text-decoration: none;
  color: inherit;
  display: block;
}
.deck-title-link h2 {
  transition: color 0.15s;
}
.deck-title-link:hover h2,
.deck-title-link:focus-visible h2 {
  color: var(--accent, #4da3ff);
}

.flashcard-deck-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
@media (min-width: 480px) {
  .flashcard-deck-list {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (min-width: 768px) {
  .flashcard-deck-list {
    grid-template-columns: repeat(6, 1fr);
  }
}

.flashcard-deck {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 12px 10px;
  border: 1px solid var(--border, #2a2a2a);
  border-radius: 8px;
  background: var(--panel, #111);
  transition:
    border-color 0.15s,
    background 0.15s;
}
.flashcard-deck:hover {
  border-color: var(--fg, #555);
  background: var(--panel-hover, #1a1a1a);
}

.deck-title-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  text-decoration: none;
  color: inherit;
}

.flashcard-deck .sec-num {
  font-size: 0.6rem;
  color: var(--muted, #888);
}

.deck-title-link h2 {
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
}

.deck-progress {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  font-weight: 600;
}
.deck-progress-known {
  color: var(--green, #3fae6a);
}
.deck-progress-total {
  color: var(--muted, #888);
}

.flashcard-deck-actions,
.flashcard-deck form {
  margin-top: 6px;
  text-align: center;
}

.deck-bulk-bar {
  position: sticky;
  top: 8px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--black);
}
.deck-bulk-bar span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-right: auto;
}

.deck-select {
  position: absolute;
  top: 6px;
  left: 6px;
  z-index: 2;
  display: none;
}
.deck-select input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}
.flashcard-deck {
  position: relative; /* 체크박스 절대 위치 기준 */
}

.completion {
  text-align: center;
  gap: 24px;
}

.completion .stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.completion .cta-row {
  justify-content: center;
  margin-top: 20px;
}

@media (min-width: 701px) {
  .card-picker {
    max-height: calc(10 * 44px + 9 * 6px);
  }

  .flashcard-page .study-area {
    display: grid;
    grid-template-columns: minmax(0, 760px) minmax(260px, 320px);
    gap: 24px;
    align-items: start;
    max-width: 1100px;
  }

  .flashcard-page .study-filter {
    grid-column: 1;
    grid-row: 1;
  }

  .flashcard-page #studyCard {
    grid-column: 1;
    grid-row: 2;
  }

  .flashcard-page .study-controls {
    grid-column: 1;
    grid-row: 3;
  }

  .flashcard-page .study-status {
    grid-column: 1;
    grid-row: 4;
  }

  .flashcard-page #cardCatalog {
    grid-column: 2;
    grid-row: 1 / span 4;
    width: 100%;
    margin: 0;
    position: sticky;
    top: 24px;
    align-self: start;
  }
}