:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #d9e2ef;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --accent: #f59e0b;
  --code-bg: #111827;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

.hero {
  background: linear-gradient(135deg, #0f766e 0%, #155e75 55%, #1f2937 100%);
  color: #ffffff;
  padding: 42px 20px 64px;
}

.hero__inner {
  max-width: 1120px;
  margin: 0 auto;
}

.hero__label {
  margin: 0 0 8px;
  color: #a7f3d0;
  font-size: 0.95rem;
  font-weight: 700;
}

.hero__top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 8px;
}

.hero__top .hero__label {
  margin: 0;
}

.logout-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 800;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.12);
}

.logout-button:hover {
  background: rgba(255, 255, 255, 0.2);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.hero__text {
  max-width: 720px;
  margin: 16px 0 0;
  color: #e6fffb;
  font-size: 1.08rem;
}

.layout {
  max-width: 1120px;
  margin: -34px auto 56px;
  padding: 0 20px;
}

.view-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin-bottom: 16px;
  padding: 18px 20px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(31, 41, 55, 0.06);
}

.view-heading__label {
  margin: 0 0 4px;
  color: var(--primary-dark);
  font-size: 0.82rem;
  font-weight: 900;
}

.view-heading h2 {
  margin: 0;
  color: #111827;
  font-size: 1.45rem;
  line-height: 1.25;
}

.view-heading p:last-child {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: right;
}

.top-categories {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.category-card {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  min-height: 132px;
  padding: 18px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 16px;
  background: linear-gradient(135deg, #ffffff 0%, #ecfeff 100%);
  color: #111827;
  box-shadow: 0 16px 34px rgba(31, 41, 55, 0.12);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.category-card::after {
  content: "";
  position: absolute;
  right: -38px;
  bottom: -48px;
  width: 130px;
  height: 130px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.42);
}

.category-card:hover,
.category-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 20px 42px rgba(31, 41, 55, 0.16);
}

.category-card:focus-visible {
  outline: 4px solid rgba(15, 118, 110, 0.22);
  outline-offset: 2px;
}

.category-card__icon {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  color: #0f172a;
  font-size: 0.95rem;
  font-weight: 950;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.8);
}

.category-card__body {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 5px;
  min-width: 0;
}

.category-card__title {
  font-size: 1.15rem;
  font-weight: 950;
  line-height: 1.25;
}

.category-card__description {
  color: #344054;
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.45;
}

.category-card__count {
  position: absolute;
  right: 16px;
  bottom: 14px;
  z-index: 1;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: #111827;
  font-size: 0.8rem;
  font-weight: 950;
}

.category-card--programming,
.category-card--security {
  background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 55%, #ffffff 100%);
}

.category-card--web,
.category-card--database {
  background: linear-gradient(135deg, #ecfdf5 0%, #ccfbf1 58%, #ffffff 100%);
}

.category-card--ai,
.category-card--quiz {
  background: linear-gradient(135deg, #eef2ff 0%, #fae8ff 58%, #ffffff 100%);
}

.category-card--git,
.category-card--docker,
.category-card--frequent {
  background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 58%, #ffffff 100%);
}

.list-toolbar {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 12px;
}

.back-home-button {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid #99f6e4;
  border-radius: 8px;
  background: #ecfdf5;
  color: var(--primary-dark);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 950;
  cursor: pointer;
}

.back-home-button:hover {
  background: #ccfbf1;
}

.controls {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(160px, 220px) minmax(180px, 240px) auto;
  gap: 14px;
  align-items: end;
  padding: 18px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 48px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  outline: none;
}

input {
  padding: 0 16px;
}

select {
  padding: 0 12px;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.15);
}

.result-count {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border-radius: 8px;
  background: #ecfdf5;
  color: var(--primary-dark);
  font-weight: 800;
  white-space: nowrap;
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.word-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(31, 41, 55, 0.06);
}

.word-card--favorite {
  border-color: #facc15;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.14);
}

.word-card__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.english {
  margin: 0;
  color: var(--primary-dark);
  font-size: 1.55rem;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.reading {
  margin: 5px 0 0;
  color: #475467;
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.35;
}

.label-group {
  flex: 0 0 auto;
  max-width: 52%;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.category {
  padding: 5px 9px;
  border-radius: 999px;
  background: #fff7ed;
  color: #9a3412;
  font-size: 0.78rem;
  font-weight: 800;
  text-align: center;
}

.level {
  padding: 5px 9px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1.2;
  text-align: center;
}

.level--beginner {
  background: #dcfce7;
  color: #166534;
}

.level--intermediate {
  background: #fef3c7;
  color: #92400e;
}

.level--advanced {
  background: #fce7f3;
  color: #9f1239;
}

.japanese {
  margin: 0;
  color: #111827;
  font-size: 1.25rem;
  font-weight: 800;
}

.meta-block {
  margin: 0;
}

.meta-block dt {
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.example-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.copy-button {
  min-width: 76px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid #99f6e4;
  border-radius: 8px;
  background: #ecfdf5;
  color: var(--primary-dark);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 900;
  line-height: 1.1;
  cursor: pointer;
}

.copy-button:hover:not(:disabled) {
  background: #ccfbf1;
}

.copy-button:disabled {
  cursor: default;
  opacity: 0.78;
}

.favorite-button,
.review-done-button,
.primary-action {
  min-height: 42px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 900;
  cursor: pointer;
}

.favorite-button {
  align-self: flex-start;
  padding: 0 12px;
}

.favorite-button.is-favorite {
  border-color: #facc15;
  background: #fef9c3;
  color: #854d0e;
}

.review-done-button,
.primary-action {
  width: 100%;
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.review-done-button:hover,
.primary-action:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.meta-block dd {
  margin: 0;
}

.example {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--code-bg);
  color: #e5e7eb;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  overflow-x: auto;
}

.memo {
  color: #475467;
}

.empty-message {
  margin: 32px 0;
  padding: 24px;
  background: #ffffff;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
  font-weight: 700;
}

.quiz-panel {
  max-width: 720px;
  margin: 24px auto 0;
  padding: 22px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.quiz-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.quiz-action-button {
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid #99f6e4;
  border-radius: 8px;
  background: #ecfdf5;
  color: var(--primary-dark);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 950;
  line-height: 1.2;
  cursor: pointer;
}

.quiz-action-button:hover {
  background: #ccfbf1;
}

.quiz-action-button--danger {
  border-color: #fecaca;
  background: #fef2f2;
  color: #b91c1c;
}

.quiz-action-button--danger:hover {
  background: #fee2e2;
}

.quiz-status {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  color: var(--primary-dark);
  font-weight: 900;
}

.quiz-panel h2 {
  margin: 0 0 18px;
  color: #111827;
  font-size: 1.7rem;
  line-height: 1.35;
}

.quiz-options {
  display: grid;
  gap: 12px;
}

.quiz-option {
  width: 100%;
  min-height: 54px;
  padding: 12px 14px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.55;
  text-align: left;
  white-space: normal;
  cursor: pointer;
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--primary);
  background: #ecfdf5;
}

.quiz-option.is-correct {
  border-color: #16a34a;
  background: #dcfce7;
  color: #166534;
}

.quiz-option.is-wrong {
  border-color: #dc2626;
  background: #fee2e2;
  color: #991b1b;
}

.quiz-feedback {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-radius: 8px;
  font-weight: 900;
}

.quiz-feedback.is-correct {
  background: #dcfce7;
  color: #166534;
}

.quiz-feedback.is-wrong {
  background: #fee2e2;
  color: #991b1b;
}

.quiz-panel .primary-action {
  margin-top: 14px;
}

.site-footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin: 28px auto;
  padding: 0 20px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.site-footer a,
.legal-nav a,
.simple-header__home {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover,
.legal-nav a:hover,
.simple-header__home:hover {
  color: var(--primary-dark);
}

.bottom-nav {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  display: none;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--line);
  box-shadow: 0 -10px 24px rgba(31, 41, 55, 0.12);
  backdrop-filter: blur(10px);
}

.controls.is-hidden,
[hidden] {
  display: none !important;
}

.bottom-nav__item {
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #475467;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 900;
  cursor: pointer;
}

.bottom-nav__item.is-active {
  background: #ecfdf5;
  color: var(--primary-dark);
}

.simple-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.simple-header__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.simple-header__home {
  color: var(--primary-dark);
  font-weight: 900;
}

.legal-nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.legal-page {
  max-width: 960px;
  margin: 28px auto;
  padding: 0 20px;
}

.legal-panel {
  padding: 28px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.legal-panel h1 {
  color: #111827;
  font-size: 2.2rem;
}

.legal-updated {
  margin: 10px 0 22px;
  color: var(--muted);
  font-weight: 800;
}

.legal-section {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.legal-section h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  line-height: 1.35;
}

.legal-section p {
  margin: 0 0 16px;
  color: #475467;
}

.login-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f766e 0%, #155e75 56%, #1f2937 100%);
}

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

.login-panel {
  width: min(100%, 440px);
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 70px rgba(17, 24, 39, 0.25);
}

.login-panel .hero__label {
  color: var(--primary-dark);
}

.login-title {
  color: #111827;
  font-size: 2rem;
}

.login-copy {
  margin: 10px 0 22px;
  color: var(--muted);
}

.login-error {
  margin: 0 0 16px;
  padding: 12px 14px;
  border: 1px solid #fecaca;
  border-radius: 8px;
  background: #fef2f2;
  color: #b91c1c;
  font-weight: 800;
}

.login-form {
  display: grid;
  gap: 16px;
}

.login-button {
  min-height: 50px;
  border: 0;
  border-radius: 8px;
  background: var(--primary);
  color: #ffffff;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.login-button:hover {
  background: var(--primary-dark);
}

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

  .controls {
    grid-template-columns: 1fr 1fr;
  }

  .result-count {
    grid-column: 1 / -1;
  }

  .word-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  body {
    font-size: 14px;
    line-height: 1.55;
    padding-bottom: calc(72px + env(safe-area-inset-bottom));
  }

  .hero {
    margin: calc(10px + env(safe-area-inset-top)) 10px 0;
    padding: 24px 16px 30px;
    border-radius: 18px;
    box-shadow: 0 16px 38px rgba(17, 24, 39, 0.22);
  }

  .hero__top {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 8px;
  }

  .hero__label {
    font-size: 0.78rem;
  }

  .logout-button {
    min-height: 34px;
    padding: 0 11px;
    font-size: 0.78rem;
  }

  h1 {
    font-size: 1.55rem;
    line-height: 1.2;
  }

  .hero__text {
    margin-top: 9px;
    font-size: 0.94rem;
    line-height: 1.55;
  }

  .layout {
    margin-top: 16px;
    padding: 0 10px 24px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }

  .view-heading {
    display: block;
    margin-bottom: 14px;
    padding: 14px;
    border-radius: 14px;
    box-shadow: 0 12px 28px rgba(31, 41, 55, 0.08);
  }

  .view-heading__label {
    font-size: 0.76rem;
  }

  .view-heading h2 {
    font-size: 1.18rem;
  }

  .view-heading p:last-child {
    margin-top: 6px;
    max-width: none;
    font-size: 0.84rem;
    line-height: 1.45;
    text-align: left;
  }

  .top-categories {
    gap: 14px;
    padding: 14px;
    border: 1px solid rgba(217, 226, 239, 0.9);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 16px 34px rgba(31, 41, 55, 0.1);
  }

  .category-card {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    min-height: 112px;
    padding: 13px;
    border-radius: 12px;
    box-shadow: 0 10px 22px rgba(31, 41, 55, 0.1);
  }

  .category-card__icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    font-size: 0.8rem;
  }

  .category-card__title {
    padding-right: 58px;
    font-size: 1rem;
    line-height: 1.28;
  }

  .category-card__description {
    padding-right: 38px;
    font-size: 0.82rem;
    line-height: 1.42;
  }

  .category-card__count {
    right: 11px;
    bottom: 10px;
    padding: 4px 8px;
    font-size: 0.72rem;
  }

  .list-toolbar {
    margin-bottom: 8px;
  }

  .back-home-button {
    width: 100%;
    min-height: 42px;
    font-size: 0.84rem;
  }

  .controls {
    grid-template-columns: 1fr;
    gap: 9px;
    padding: 12px;
    border-radius: 8px;
  }

  label {
    margin-bottom: 4px;
    font-size: 0.76rem;
  }

  input,
  select {
    min-height: 40px;
    font-size: 0.92rem;
  }

  input {
    padding: 0 11px;
  }

  select {
    padding: 0 10px;
  }

  .result-count {
    min-height: 38px;
    padding: 0 10px;
    font-size: 0.86rem;
  }

  .word-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 14px;
  }

  .word-card {
    gap: 9px;
    padding: 12px;
  }

  .word-card__head {
    flex-direction: column;
    gap: 7px;
  }

  .english {
    font-size: 1.7rem;
  }

  .reading {
    margin-top: 3px;
    font-size: 0.92rem;
  }

  .japanese {
    font-size: 1.45rem;
    line-height: 1.3;
  }

  .meta-block dt {
    margin-bottom: 2px;
    font-size: 0.76rem;
  }

  .meta-block dd {
    font-size: 0.92rem;
  }

  .label-group {
    max-width: 100%;
    justify-content: flex-start;
    gap: 5px;
  }

  .category,
  .level {
    max-width: 100%;
    padding: 4px 7px;
    font-size: 0.72rem;
    line-height: 1.15;
  }

  .example-title {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .example {
    padding: 8px 9px;
    font-size: 0.82rem;
    line-height: 1.45;
  }

  .copy-button {
    width: 100%;
    min-height: 40px;
    padding: 0 10px;
    font-size: 0.8rem;
  }

  .favorite-button,
  .review-done-button,
  .primary-action {
    width: 100%;
    min-height: 42px;
    font-size: 0.84rem;
  }

  .empty-message {
    margin: 18px 0;
    padding: 16px;
    font-size: 0.9rem;
  }

  .quiz-panel {
    margin-top: 12px;
    padding: 14px;
  }

  .quiz-actions {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 14px;
  }

  .quiz-action-button {
    min-height: 42px;
    font-size: 0.84rem;
  }

  .quiz-status {
    margin-bottom: 12px;
    font-size: 0.88rem;
  }

  .quiz-panel h2 {
    margin-bottom: 14px;
    font-size: 1.25rem;
  }

  .quiz-options {
    gap: 9px;
  }

  .quiz-option {
    min-height: 48px;
    padding: 10px 12px;
    font-size: 0.94rem;
  }

  .quiz-feedback {
    margin-top: 12px;
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .site-footer {
    margin: 20px auto;
    padding-bottom: 10px;
    gap: 12px;
    font-size: 0.8rem;
  }

  .bottom-nav {
    display: grid;
  }

  .simple-header__inner {
    display: block;
    padding: 12px 14px;
  }

  .legal-nav {
    margin-top: 8px;
    gap: 10px;
    font-size: 0.8rem;
  }

  .legal-page {
    margin: 16px auto;
    padding: 0 10px;
  }

  .legal-panel {
    padding: 16px;
  }

  .legal-panel h1 {
    font-size: 1.55rem;
  }

  .legal-section h2 {
    font-size: 1.05rem;
  }

  .login-shell {
    padding: 14px;
    padding-bottom: calc(14px + env(safe-area-inset-bottom));
  }

  .login-panel {
    padding: 18px;
  }

  .login-title {
    font-size: 1.55rem;
  }

  .login-copy {
    margin: 8px 0 16px;
    font-size: 0.92rem;
  }

  .login-form {
    gap: 12px;
  }

  .login-button {
    min-height: 42px;
    font-size: 0.94rem;
  }
}