* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

:root {
  --fvc-bg-from: #f7f8ff;
  --fvc-bg-to: #fff7fb;
  --fvc-card: #ffffff;
  --fvc-text: #273044;
  --fvc-text-soft: #626b80;
  --fvc-accent: #6878e8;
  --fvc-accent-strong: #5261d6;
  --fvc-accent-soft: #eef1ff;
  --fvc-pink-soft: #fff1f7;
  --fvc-green-soft: #f2fbf6;
  --fvc-border: #e2e6f0;
  --fvc-radius: 14px;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--fvc-text);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.75;
  background: linear-gradient(160deg, var(--fvc-bg-from), var(--fvc-bg-to));
}

.fvc-page {
  max-width: 680px;
  margin: 0 auto;
  padding: 34px 16px 48px;
}

.fvc-hero {
  margin-bottom: 26px;
  text-align: center;
}

.fvc-hero-label {
  margin: 0 0 4px;
  color: var(--fvc-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fvc-hero-title {
  margin: 0 0 10px;
  font-size: clamp(25px, 7vw, 34px);
  line-height: 1.35;
  letter-spacing: 0;
}

.fvc-hero-concept {
  margin: 0 0 8px;
  color: var(--fvc-accent-strong);
  font-size: 15px;
  font-weight: 700;
}

.fvc-hero-sub {
  margin: 0 0 12px;
  color: var(--fvc-text-soft);
  font-size: 13px;
}

.fvc-hero-note {
  display: inline-block;
  max-width: 100%;
  margin: 0;
  padding: 5px 14px;
  color: var(--fvc-text-soft);
  background: var(--fvc-accent-soft);
  border-radius: 999px;
  font-size: 11px;
}

@media (min-width: 520px) {
  .fvc-br-sp {
    display: none;
  }
}

.fvc-card {
  padding: 22px 18px;
  background: var(--fvc-card);
  border: 1px solid var(--fvc-border);
  border-radius: var(--fvc-radius);
  box-shadow: 0 8px 26px rgba(89, 104, 184, 0.08);
}

.fvc-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 18px;
  padding: 4px;
  background: var(--fvc-accent-soft);
  border-radius: 12px;
}

.fvc-tab {
  min-height: 42px;
  padding: 9px 10px;
  color: var(--fvc-text-soft);
  background: transparent;
  border: 0;
  border-radius: 9px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.fvc-tab.is-active {
  color: var(--fvc-accent-strong);
  background: #fff;
  box-shadow: 0 3px 12px rgba(89, 104, 184, 0.1);
}

.fvc-tab:focus-visible {
  outline: 2px solid var(--fvc-accent);
  outline-offset: 2px;
}

.fvc-tab-panel {
  margin-bottom: 20px;
}

.fvc-field {
  margin: 0 0 22px;
  padding: 0;
  border: 0;
}

.fvc-field:last-of-type {
  margin-bottom: 8px;
}

.fvc-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.fvc-collapse {
  margin: 0 0 22px;
  border: 1px solid var(--fvc-border);
  border-radius: 12px;
  background: #fbfcff;
}

.fvc-collapse-summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 14px;
  color: var(--fvc-text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
}

.fvc-collapse-summary::after {
  content: "";
  flex: 1;
  height: 1px;
  margin-left: 10px;
  background: var(--fvc-border);
}

.fvc-collapse-body {
  margin: 0;
  padding: 0 14px 14px;
}

.fvc-label {
  display: block;
  margin-bottom: 6px;
  padding: 0;
  font-size: 14px;
  font-weight: 700;
}

.fvc-optional {
  margin-left: 4px;
  padding: 1px 8px;
  color: var(--fvc-text-soft);
  background: var(--fvc-accent-soft);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 400;
}

.fvc-hint {
  margin: 0 0 8px;
  color: var(--fvc-text-soft);
  font-size: 12px;
}

.fvc-input,
.fvc-textarea {
  width: 100%;
  padding: 11px 12px;
  color: var(--fvc-text);
  background: #fbfcff;
  border: 1px solid var(--fvc-border);
  border-radius: 10px;
  font: inherit;
  font-size: 16px;
  line-height: 1.65;
}

.fvc-textarea {
  min-height: 86px;
  resize: vertical;
}

.fvc-input:focus,
.fvc-textarea:focus {
  border-color: var(--fvc-accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(104, 120, 232, 0.16);
}

.fvc-input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.fvc-input-row .fvc-input {
  min-width: 0;
  flex: 1;
}

.fvc-input-row .fvc-btn {
  flex: 0 0 auto;
}

.fvc-fetch-summary {
  margin: 10px 0 12px;
  padding: 10px 12px;
  color: var(--fvc-text-soft);
  background: #fbfcff;
  border: 1px solid var(--fvc-border);
  border-radius: 10px;
  font-size: 12px;
}

.fvc-fetch-summary-title {
  margin: 0 0 4px;
  color: var(--fvc-text);
  font-weight: 700;
}

.fvc-fetch-summary ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
  margin: 0;
  padding-left: 1.2em;
}

.fvc-btn-inline {
  margin-top: 10px;
}

.fvc-inline-actions {
  display: flex;
  gap: 8px;
  align-items: stretch;
  margin-top: 10px;
}

.fvc-inline-actions .fvc-btn {
  flex: 1;
  margin-top: 0;
}

.fvc-action-help {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
  gap: 5px;
}

.fvc-action-help p {
  margin: 0;
  color: var(--fvc-text-soft);
  font-size: 12px;
  line-height: 1.55;
}

.fvc-status {
  min-height: 1.5em;
  margin: 8px 0 0;
  color: var(--fvc-text-soft);
  font-size: 12px;
}

.fvc-channel-preview {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
  padding: 10px;
  background: #fbfcff;
  border: 1px solid var(--fvc-border);
  border-radius: 10px;
}

.fvc-channel-preview img {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--fvc-accent-soft);
}

.fvc-channel-title {
  margin: 0 0 2px;
  font-size: 13px;
  font-weight: 700;
}

.fvc-submit-notice {
  margin-top: 10px;
  padding: 12px;
  background: var(--fvc-green-soft);
  border: 1px solid #cfe9d9;
  border-radius: 10px;
}

.fvc-submit-notice p {
  margin: 0 0 8px;
  color: var(--fvc-text);
  font-size: 13px;
  line-height: 1.65;
}

.fvc-submit-notice .fvc-btn {
  display: inline-flex;
  width: auto;
}

.fvc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.fvc-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
  padding-top: 2px;
}

.fvc-chip-group + .fvc-chip-group {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--fvc-border);
}

.fvc-chip-heading {
  width: 100%;
  margin: 0 0 2px;
  color: var(--fvc-text-soft);
  font-size: 12px;
  font-weight: 700;
}

.fvc-chip {
  position: relative;
  display: inline-flex;
}

.fvc-chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.fvc-chip span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 7px 14px;
  color: var(--fvc-text);
  background: #fbfcff;
  border: 1px solid var(--fvc-border);
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.3;
  user-select: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.15s;
}

.fvc-chip span:hover {
  border-color: #c8cef2;
}

.fvc-chip input:checked + span {
  color: #fff;
  background: var(--fvc-accent);
  border-color: var(--fvc-accent);
}

.fvc-chip input:focus-visible + span {
  box-shadow: 0 0 0 3px rgba(104, 120, 232, 0.26);
}

.fvc-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.fvc-btn {
  min-height: 44px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  line-height: 1.35;
  transition: opacity 0.15s, background 0.15s, border-color 0.15s;
}

.fvc-btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.fvc-btn-primary {
  flex: 1;
  color: #fff;
  background: linear-gradient(135deg, #7e8cf4, #ad84e9);
  font-weight: 700;
}

.fvc-btn-primary:hover {
  opacity: 0.92;
}

.fvc-btn-ghost {
  color: var(--fvc-text-soft);
  background: transparent;
  border-color: var(--fvc-border);
}

.fvc-btn-ghost:hover {
  background: var(--fvc-accent-soft);
}

.fvc-btn-copy {
  margin-top: 12px;
  color: var(--fvc-accent-strong);
  background: var(--fvc-accent-soft);
  font-weight: 700;
}

.fvc-btn-copy:hover {
  background: #e2e6ff;
}

.fvc-btn-copy.is-copied {
  color: #21784a;
  background: #e6f7ee;
}

.fvc-note {
  margin: 14px 0 0;
  color: var(--fvc-text-soft);
  font-size: 12px;
  text-align: center;
}

.fvc-result {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 26px;
  /* sticky ナビバー(約64px)ぶん、scrollIntoView の着地点を下げる */
  scroll-margin-top: 80px;
}

.fvc-result-block {
  padding: 18px;
}

.fvc-result-mark {
  display: flex;
  align-items: center;
  gap: 16px;
  border-color: #d8e2ff;
  background: linear-gradient(145deg, #ffffff, #edf4ff);
}

.fvc-result-mark.is-good {
  border-color: #bfe6d2;
  background: linear-gradient(145deg, #ffffff, var(--fvc-green-soft));
}

.fvc-result-mark.is-warn {
  border-color: #f0dca8;
  background: linear-gradient(145deg, #ffffff, #fff7dd);
}

.fvc-result-mark.is-bad {
  border-color: #efb9c4;
  background: linear-gradient(145deg, #ffffff, var(--fvc-pink-soft));
}

.fvc-mark-symbol {
  display: grid;
  width: 76px;
  height: 76px;
  place-items: center;
  flex: 0 0 auto;
  color: var(--fvc-accent-strong);
  background: #fff;
  border: 3px solid currentColor;
  border-radius: 50%;
  font-size: 46px;
  font-weight: 800;
  line-height: 1;
}

.fvc-result-mark.is-good .fvc-mark-symbol {
  color: #23956a;
}

.fvc-result-mark.is-warn .fvc-mark-symbol {
  color: #b17800;
}

.fvc-result-mark.is-bad .fvc-mark-symbol {
  color: #d64064;
}

.fvc-mark-body {
  min-width: 0;
}

.fvc-mark-title {
  margin: 0 0 6px;
  color: var(--fvc-text);
  font-size: 18px;
  line-height: 1.45;
}

.fvc-mark-text {
  margin: 0;
  color: var(--fvc-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

.fvc-result-good {
  background: linear-gradient(150deg, #fff, var(--fvc-green-soft));
}

.fvc-result-tips {
  background: linear-gradient(150deg, #fff, var(--fvc-pink-soft));
}

.fvc-result-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.5;
}

.fvc-result-icon {
  display: inline-grid;
  width: 24px;
  height: 24px;
  place-items: center;
  flex: 0 0 auto;
  color: var(--fvc-accent-strong);
  background: var(--fvc-accent-soft);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 700;
}

.fvc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}

.fvc-list li {
  position: relative;
  margin-bottom: 8px;
  padding-left: 1.15em;
}

.fvc-list li:last-child {
  margin-bottom: 0;
}

.fvc-list li::before {
  position: absolute;
  left: 0;
  color: var(--fvc-accent);
  content: "・";
}

.fvc-copy-box {
  margin: 0;
  padding: 12px 14px;
  color: var(--fvc-text);
  background: #fbfcff;
  border: 1px dashed var(--fvc-border);
  border-radius: 10px;
  font-size: 14px;
}

.fvc-copy-pre {
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: inherit;
  line-height: 1.8;
}

.fvc-result-footer {
  margin: 4px 0 0;
  color: var(--fvc-text-soft);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 460px) {
  .fvc-page {
    padding: 24px 12px 40px;
  }

  .fvc-card {
    padding: 18px 14px;
  }

  .fvc-tabs {
    grid-template-columns: 1fr;
  }

  .fvc-actions {
    flex-direction: column;
  }

  .fvc-input-row {
    flex-direction: column;
  }

  .fvc-inline-actions {
    flex-direction: column;
  }

  .fvc-fetch-summary ul {
    grid-template-columns: 1fr;
  }

  .fvc-result-mark {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .fvc-mark-symbol {
    width: 64px;
    height: 64px;
    font-size: 38px;
  }

  .fvc-btn {
    width: 100%;
  }
}