/* ─── Design Tokens ─────────────────────────────────────── */
:root {
  /* Colors */
  --color-primary:    #5B7B8A;
  --color-secondary:  #C4725B;
  --color-accent:     #7BA67D;
  --color-bg:         #F5F0EB;
  --color-surface:    #FFFFFF;
  --color-text:       #2C2C2C;
  --color-text-muted: #6B6B6B;
  --color-border:     #E0D8D0;

  /* CEFR level progression */
  --level-a1: #BCD4DE;
  --level-a2: #8FB3C2;
  --level-b1: #5B7B8A;
  --level-b2: #3D5C6D;
  --level-c1: #2A4050;
  --level-c2: #1A2E3C;

  /* Typography */
  --font-heading: "DM Sans", system-ui, sans-serif;
  --font-body:    "Source Serif 4", Georgia, serif;
  --font-mono:    ui-monospace, "Cascadia Code", "Fira Code", monospace;

  /* Spacing (4px base) */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-12: 48px;
  --sp-16: 64px;
}

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

body, h1, h2, h3, h4, p, ul, ol, figure, dl, dd { margin: 0; }

img, svg { display: block; max-width: 100%; }

/* ─── Base Typography ───────────────────────────────────── */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

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

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

small {
  font-size: 0.85em;
  color: var(--color-text-muted);
}

/* ─── Beta Badge ───────────────────────────────────────── */
.beta-badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--color-secondary);
  color: #fff;
  line-height: 1.4;
  vertical-align: middle;
}

/* ─── CEFR Level Badges ─────────────────────────────────── */
.badge-a1, .badge-a2, .badge-b1, .badge-b2, .badge-c1, .badge-c2 {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.4;
}

.badge-a1 { background: var(--level-a1); color: var(--color-text); }
.badge-a2 { background: var(--level-a2); color: #fff; }
.badge-b1 { background: var(--level-b1); color: #fff; }
.badge-b2 { background: var(--level-b2); color: #fff; }
.badge-c1 { background: var(--level-c1); color: #fff; }
.badge-c2 { background: var(--level-c2); color: #fff; }

/* ─── Flash Messages ────────────────────────────────────── */
.flash {
  padding: var(--sp-3) var(--sp-4);
  border-radius: 6px;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  margin-bottom: var(--sp-4);
}

.flash--notice {
  background: #e8f5e9;
  color: #2e7d32;
}

.flash--alert {
  background: #fbe9e7;
  color: #c62828;
}

/* ─── Shared Components ────────────────────────────────── */
.text-muted {
  color: var(--color-text-muted);
}

.detail-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--sp-4) var(--sp-6);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  margin-bottom: var(--sp-6);
}

.detail-card__row {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.detail-card__row:last-child {
  border-bottom: none;
}

.detail-card__label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  min-width: 80px;
  padding-top: 2px;
}

.topic-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  margin-right: var(--sp-1);
  margin-bottom: var(--sp-1);
}

/* ─── Logo Icon ─────────────────────────────────────────── */
.logo-icon {
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

/* ─── Tab Navigation ────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: var(--sp-1);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--sp-4);
  padding-bottom: 0;
}

.tab-nav__link {
  padding: var(--sp-2) var(--sp-4);
  border-radius: 6px 6px 0 0;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-bottom: none;
  margin-bottom: -2px;
  cursor: pointer;
  transition: opacity 0.15s;
  opacity: 0.65;
}

.tab-nav__link:hover {
  opacity: 1;
}

.tab-nav__link--active {
  opacity: 1;
  border-color: var(--color-border);
  border-bottom: 2px solid var(--color-surface);
  background: var(--color-surface);
}

/* ─── Article content ─────────────────────────────────────── */
.article-body {
  font-family: var(--font-body);
  margin: 0;
}

/* ─── Copy Content ──────────────────────────────────────── */
.copy-content {
  font-family: var(--font-body);
  font-size: 0.975rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
  overflow: auto;
  max-height: 600px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--sp-4);
  margin: 0;
}

/* ─── Vocabulary ────────────────────────────────────────── */
.vocab-heading {
  font-size: 1rem;
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-4);
}

.vocab-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.vocab-item dt {
  font-size: 0.875rem;
}

.vocab-example {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-left: 0;
  margin-top: var(--sp-1);
  font-style: italic;
}

.vocab-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-4);
}

.vocab-heading-row .vocab-heading {
  margin: 0;
}

.vocab-toggle {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}

.vocab-toggle__btn {
  background: var(--color-surface);
  border: none;
  padding: var(--sp-1) var(--sp-3);
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.vocab-toggle__btn:not(:last-child) {
  border-right: 1px solid var(--color-border);
}

.vocab-toggle__btn--active {
  background: var(--color-primary);
  color: #fff;
}

/* ─── Nav Dropdown ─────────────────────────────────────── */
.nav-dropdown {
  position: relative;
}

.nav-dropdown summary {
  list-style: none;
  cursor: pointer;
}

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

.nav-dropdown__summary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  padding: var(--sp-1) 0;
  user-select: none;
}

.nav-dropdown__summary::after {
  content: "▾";
  font-size: 0.75rem;
  opacity: 0.6;
}

.nav-dropdown__panel {
  position: absolute;
  right: 0;
  top: calc(100% + var(--sp-2));
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  min-width: 160px;
  z-index: 100;
  overflow: hidden;
}

.nav-dropdown__item {
  display: block;
  padding: var(--sp-2) var(--sp-4);
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-dropdown__item:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.nav-dropdown__item--muted {
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

.nav-dropdown__item--muted:hover {
  color: var(--color-secondary);
}

/* ─── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: var(--sp-3) var(--sp-6);
  border-radius: 6px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-secondary);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-secondary);
}

.btn--block {
  display: block;
  width: 100%;
  text-align: center;
}

.btn--danger {
  background: #c0392b;
  color: #fff;
}

.btn--danger:hover {
  background: #a93226;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--sm {
  font-size: 0.8rem;
  padding: var(--sp-1) var(--sp-3);
}

/* ─── Forms ────────────────────────────────────────────── */
.app-form label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--sp-1);
}

.app-form input[type="text"],
.app-form input[type="email"],
.app-form input[type="password"],
.app-form input[type="url"],
.app-form input[type="datetime-local"],
.app-form textarea,
.app-form select {
  display: block;
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  margin-bottom: var(--sp-4);
  transition: border-color 0.15s;
}

.app-form input:focus,
.app-form textarea:focus,
.app-form select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(91, 123, 138, 0.15);
}

.app-form textarea {
  min-height: 120px;
  resize: vertical;
}

.app-form input[type="submit"],
.app-form button[type="submit"] {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  padding: var(--sp-2) var(--sp-6);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
}

.app-form input[type="submit"]:hover,
.app-form button[type="submit"]:hover {
  background: var(--color-secondary);
}

/* ─── Form Validation Errors ──────────────────────────── */
.app-form__error {
  display: block;
  color: #c62828;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  margin-top: calc(-1 * var(--sp-3));
  /* margin-bottom: var(--sp-4); */
  min-height: 0;
}

.app-form__input--error {
  border-color: #c62828 !important;
}

.app-form__input--error:focus {
  box-shadow: 0 0 0 3px rgba(198, 40, 40, 0.15) !important;
}

.app-form__forgot-link {
  text-align: right;
  margin: calc(-1 * var(--sp-2)) 0 var(--sp-4);
  font-size: 0.85rem;
}

.app-form__forgot-link a {
  color: var(--color-primary);
}

/* ─── Checkbox ─────────────────────────────────────────── */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
}

.checkbox-row input[type="checkbox"] {
  margin-top: 3px;
  flex-shrink: 0;
}

.checkbox-row label {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ─── Profile ──────────────────────────────────────────── */
.profile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-6);
}

.profile-section {
  margin-bottom: var(--sp-6);
}

.role-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: capitalize;
}

.role-badge--admin {
  background: #fce4ec;
  color: #c62828;
}

.role-badge--member {
  background: #e8f5e9;
  color: #2e7d32;
}

.role-badge--guest {
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.day-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

/* ─── Danger Zone ─────────────────────────────────────── */
.danger-zone {
  margin-top: var(--sp-12);
}

.danger-zone__title {
  font-size: 1.1rem;
  margin-bottom: var(--sp-4);
}

.danger-zone__card {
  background: var(--color-surface);
  border: 1px solid #e6b0aa;
  border-radius: 8px;
  padding: var(--sp-4) var(--sp-6);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.danger-zone__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

.danger-zone__row p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ─── Delete Modal ────────────────────────────────────── */
.delete-modal {
  border: none;
  border-radius: 12px;
  padding: 0;
  max-width: 520px;
  width: 90vw;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.delete-modal::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.delete-modal__content {
  padding: var(--sp-6);
}

.delete-modal__content h2 {
  margin-bottom: var(--sp-4);
}

.delete-modal__content p {
  font-size: 0.9rem;
  padding-bottom: var(--sp-1);
}

.delete-modal__warning {
  background: #fdecea;
  border-left: 4px solid #c0392b;
  padding: var(--sp-3) var(--sp-4);
  border-radius: 0 6px 6px 0;
  margin-bottom: var(--sp-6);
}

.delete-modal__warning p {
  font-size: 0.9rem;
  color: #922b21;
  margin: 0;
}

.delete-modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.btn--danger-outline {
  background: transparent;
  color: #c0392b;
  border: 1px solid #e6b0aa;
}

.btn--danger-outline:hover {
  border-color: #c0392b;
  color: #a93226;
  background: transparent;
}

/* ─── Day Picker ───────────────────────────────────────── */
.day-picker {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-bottom: var(--sp-6);
}

.day-picker__item {
  position: relative;
  cursor: pointer;
}

.day-picker__item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.day-picker__label {
  display: inline-block;
  padding: var(--sp-2) var(--sp-3);
  border-radius: 6px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all 0.15s;
  cursor: pointer;
}

.day-picker__item input:checked + .day-picker__label {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.day-picker__label:hover {
  border-color: var(--color-primary);
}

/* ─── Topic Picker ────────────────────────────────────── */
.topic-picker__group {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--sp-3) var(--sp-4);
  margin-bottom: var(--sp-3);
}

.topic-picker__legend {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0 var(--sp-1);
}

.topic-picker__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.day-picker__label--all {
  border-style: dashed;
}

/* ─── Step Indicator ──────────────────────────────────── */
.step-indicator {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  margin-bottom: var(--sp-8);
}

.step-indicator__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  flex: 1;
  max-width: 140px;
}

.step-indicator__circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  position: relative;
  z-index: 1;
  transition: all 0.2s;
}

.step-indicator__label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--sp-1);
  text-align: center;
  transition: color 0.2s;
}

/* Connector lines between circles */
.step-indicator__step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 16px;
  left: calc(50% + 20px);
  width: calc(100% - 40px);
  height: 2px;
  background: var(--color-border);
  transition: background 0.2s;
}

/* Active step */
.step-indicator__step--active .step-indicator__circle {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}

.step-indicator__step--active .step-indicator__label {
  color: var(--color-primary);
  font-weight: 600;
}

/* Completed step */
.step-indicator__step--completed .step-indicator__circle {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #fff;
}

.step-indicator__step--completed .step-indicator__label {
  color: var(--color-accent);
}

.step-indicator__step--completed:not(:last-child)::after {
  background: var(--color-accent);
}

/* ─── Step Navigation Buttons ─────────────────────────── */
.step-nav {
  display: flex;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

.step-nav .btn {
  flex: 1;
}

/* ─── Points Page ─────────────────────────────────────── */
.points-balance {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.points-batch {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--sp-2);
}

.detail-card__row--header {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--sp-2);
  border-bottom: 2px solid var(--color-border);
}

.detail-card__row--header .detail-card__label {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.points-status {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
}

.points-status--active {
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 25%, transparent);
}

.points-status--expired {
  color: var(--color-text-muted);
  background: color-mix(in srgb, var(--color-text-muted) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-text-muted) 25%, transparent);
}

.points-status--exhausted {
  color: var(--color-secondary);
  background: color-mix(in srgb, var(--color-secondary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-secondary) 25%, transparent);
}