.support-chat-section {
  --chat-blue: #2a70e0;
  --chat-blue-dark: #1756b7;
  --chat-green: #06c755;
  --chat-ink: #24324a;
  --chat-muted: #657087;
  --chat-border: #dfe7f3;
  --chat-bg: #f4f8ff;
  position: fixed;
  z-index: 2000;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--chat-ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.support-chat-section.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

html.support-chat-open,
body.support-chat-open {
  overflow: hidden !important;
  overscroll-behavior: none;
}

.support-chat-section *,
.support-chat-section *::before,
.support-chat-section *::after {
  box-sizing: border-box;
}

.support-chat-section .material-symbols-rounded,
.support-mobile-line .material-symbols-rounded {
  font-family: "Material Symbols Rounded";
  font-style: normal;
  font-weight: normal;
  font-variation-settings: "FILL" 0, "wght" 500, "GRAD" 0, "opsz" 24;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: "liga";
  -webkit-font-smoothing: antialiased;
}

.support-chat-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: rgba(15, 25, 43, 0.72);
  cursor: default;
}

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

.support-chat-container {
  position: relative;
  z-index: 1;
  display: flex;
  height: min(900px, calc(100dvh - 40px));
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 24px;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 28px;
  background:
    radial-gradient(circle at 10% 10%, rgba(42, 112, 224, 0.1), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
  box-shadow: 0 30px 90px rgba(4, 16, 35, 0.35);
  transform: translateY(14px) scale(0.985);
  transition: transform 0.22s ease;
}

.support-chat-section.is-open .support-chat-container {
  transform: translateY(0) scale(1);
}

.support-chat-close {
  position: absolute;
  z-index: 4;
  top: 17px;
  right: 17px;
  display: grid;
  width: 42px;
  height: 42px;
  padding: 0;
  place-items: center;
  border: 1px solid #d9e2ef;
  border-radius: 50%;
  background: #fff;
  color: #43516a;
  cursor: pointer;
  box-shadow: 0 5px 16px rgba(25, 52, 93, 0.12);
}

.support-chat-close:hover {
  background: #f2f6fb;
  color: var(--chat-blue);
}

.support-chat-close:focus-visible {
  outline: 3px solid rgba(42, 112, 224, 0.25);
  outline-offset: 2px;
}

.support-chat-heading {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 14px;
  min-height: 58px;
  margin-bottom: 18px;
  padding-right: 52px;
  text-align: left;
}

.support-chat-heading__icon {
  display: grid;
  flex: 0 0 54px;
  width: 54px;
  height: 54px;
  place-items: center;
  border-radius: 17px;
  background: #fff;
  box-shadow: 0 12px 35px rgba(26, 68, 135, 0.14);
  color: var(--chat-blue);
  font-size: 30px;
}

.support-chat-heading__eyebrow {
  margin: 0 0 6px;
  color: var(--chat-blue);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.support-chat-heading h2 {
  margin: 0;
  color: var(--chat-ink);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.35;
  letter-spacing: 0.03em;
}

.support-chat-window {
  display: flex;
  min-height: 0;
  flex: 1 1 auto;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(42, 112, 224, 0.16);
  border-radius: 26px;
  background: #fff;
  box-shadow: 0 25px 65px rgba(25, 65, 125, 0.14);
}

.support-chat-window__bar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 17px 24px;
  background: var(--chat-blue);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.support-chat-window__status {
  width: 10px;
  height: 10px;
  border: 2px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  background: #68eb9d;
  box-shadow: 0 0 0 4px rgba(104, 235, 157, 0.18);
}

.support-chat-body {
  min-height: 0;
  padding: 34px;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  background: var(--chat-bg);
}

.support-chat-message {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 22px;
}

.support-chat-message--user {
  justify-content: flex-end;
}

.support-chat-message--user .support-chat-bubble {
  border-radius: 18px 4px 18px 18px;
  background: var(--chat-blue);
  color: #fff;
}

.support-chat-avatar {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 6px 16px rgba(30, 68, 128, 0.1);
  font-size: 22px;
}

.support-chat-bubble {
  max-width: 78%;
  padding: 16px 20px;
  border-radius: 4px 18px 18px;
  background: #fff;
  box-shadow: 0 7px 22px rgba(31, 71, 128, 0.08);
  font-size: 15px;
  line-height: 1.8;
}

.support-chat-bubble p {
  margin: 0;
}

.support-diagnosis {
  margin: 0 0 28px 54px;
}

.support-diagnosis__intro,
.support-diagnosis__panel {
  padding: 25px;
  border: 2px solid rgba(42, 112, 224, 0.15);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 10px 25px rgba(30, 67, 122, 0.08);
}

.support-diagnosis__badge {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  background: #eaf2ff;
  color: var(--chat-blue);
  font-size: 12px;
  font-weight: 700;
}

.support-diagnosis h3,
.support-diagnosis h4 {
  margin: 0 0 10px;
  color: var(--chat-ink);
  font-size: 20px;
  line-height: 1.5;
}

.support-diagnosis h3 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.support-diagnosis h3 .material-symbols-rounded {
  color: var(--chat-blue);
  font-size: 23px;
}

.support-diagnosis p {
  margin: 0 0 18px;
  color: var(--chat-muted);
  font-size: 14px;
  line-height: 1.8;
}

.support-diagnosis__progress {
  height: 6px;
  margin-bottom: 20px;
  overflow: hidden;
  border-radius: 999px;
  background: #e8edf5;
}

.support-diagnosis__progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--chat-blue), #5e9bff);
  transition: width 0.3s ease;
}

.support-diagnosis__count {
  display: block;
  margin-bottom: 5px;
  color: var(--chat-blue);
  font-size: 12px;
  font-weight: 700;
}

.support-diagnosis__options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.support-diagnosis__option {
  min-height: 48px;
  padding: 10px 14px;
  border: 1px solid #ccd9ec;
  border-radius: 12px;
  background: #fff;
  color: var(--chat-ink);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
  text-align: left;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.support-diagnosis__option:hover,
.support-diagnosis__option:focus-visible {
  border-color: var(--chat-blue);
  background: #f2f7ff;
  outline: none;
  transform: translateY(-1px);
}

.support-diagnosis__number {
  width: 100%;
  height: 52px;
  margin-bottom: 10px;
  padding: 0 15px;
  border: 1px solid #ccd9ec;
  border-radius: 12px;
  background: #fff;
  color: var(--chat-ink);
  font: inherit;
  font-size: 16px;
}

.support-diagnosis__number:focus {
  border-color: var(--chat-blue);
  outline: 3px solid rgba(42, 112, 224, 0.12);
}

.support-diagnosis__error {
  display: none;
  margin: 0 0 10px;
  color: #ce334b;
  font-size: 13px;
}

.support-diagnosis__error.is-visible {
  display: block;
}

.support-chat-primary,
.support-chat-secondary,
.support-chat-line {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

.support-chat-primary {
  background: var(--chat-blue);
  color: #fff;
  box-shadow: 0 8px 18px rgba(42, 112, 224, 0.25);
}

.support-chat-secondary {
  border: 1px solid #c7d5e9;
  background: #fff;
  color: var(--chat-blue-dark);
}

.support-chat-line {
  background: var(--chat-green);
  color: #fff;
  box-shadow: 0 8px 18px rgba(6, 199, 85, 0.22);
}

.support-chat-primary:hover,
.support-chat-secondary:hover,
.support-chat-line:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.support-chat-primary:focus-visible,
.support-chat-secondary:focus-visible,
.support-chat-line:focus-visible {
  outline: 3px solid rgba(42, 112, 224, 0.25);
  outline-offset: 2px;
}

.support-faq {
  margin-left: 54px;
}

.support-faq__title {
  margin: 0 0 14px;
  color: var(--chat-ink);
  font-size: 17px;
}

.support-faq__item {
  margin-bottom: 9px;
  overflow: hidden;
  border: 1px solid var(--chat-border);
  border-radius: 13px;
  background: #fff;
  box-shadow: 0 5px 16px rgba(31, 71, 128, 0.05);
}

.support-faq__item summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 48px 16px 18px;
  color: var(--chat-ink);
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.55;
}

.support-faq__item summary > .material-symbols-rounded {
  flex: 0 0 23px;
  color: var(--chat-blue);
  font-size: 21px;
}

.support-faq__item summary::-webkit-details-marker {
  display: none;
}

.support-faq__item summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 18px;
  color: var(--chat-blue);
  font-size: 24px;
  font-weight: 400;
  line-height: 1;
  transform: translateY(-50%);
}

.support-faq__item[open] summary {
  background: #f5f9ff;
  color: var(--chat-blue-dark);
}

.support-faq__item[open] summary::after {
  content: "−";
}

.support-faq__answer {
  padding: 4px 20px 20px;
  border-top: 1px solid #edf1f7;
  color: #48556b;
  font-size: 14px;
  line-height: 1.85;
}

.support-faq__answer p {
  margin: 14px 0 0;
}

.support-faq__answer ul {
  margin: 12px 0 0;
  padding-left: 1.35em;
}

.support-faq__answer li + li {
  margin-top: 3px;
}

.support-faq__answer h4 {
  margin: 17px 0 0;
  color: var(--chat-blue-dark);
  font-size: 15px;
}

.support-faq__note {
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff8e8;
  font-size: 12px;
}

.support-chat-help {
  margin: 28px 0 0 54px;
  padding: 26px;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(30, 67, 122, 0.08);
}

.support-chat-help h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--chat-ink);
  font-size: 19px;
}

.support-chat-help h3 .material-symbols-rounded {
  color: var(--chat-blue);
  font-size: 22px;
}

.support-chat-help p {
  margin: 0 0 11px;
  color: var(--chat-muted);
  font-size: 14px;
  line-height: 1.8;
}

.support-copy-template {
  margin: 18px 0;
  padding: 16px;
  border: 1px dashed #b7c8df;
  border-radius: 11px;
  background: #f8faff;
  color: #46536a;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.75;
  white-space: pre-wrap;
}

.support-chat-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.support-diagnosis__result {
  padding: 4px 0;
}

.support-diagnosis__result--unavailable {
  padding: 18px;
  border: 1px solid #f0c8cf;
  border-radius: 12px;
  background: #fff8f9;
}

.support-diagnosis__result-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  color: var(--chat-blue-dark);
  font-size: 20px;
  font-weight: 700;
}

.support-diagnosis__result-title .material-symbols-rounded {
  color: var(--chat-blue);
  font-size: 24px;
}

.support-diagnosis__result-text {
  margin: 16px 0;
  padding: 16px;
  border: 1px dashed #b7c8df;
  border-radius: 11px;
  background: #f8faff;
  color: #3e4d64;
  font-size: 13px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.support-diagnosis__restart {
  display: inline-block;
  margin-top: 14px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--chat-blue);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  text-decoration: underline;
}

.support-copy-toast {
  position: fixed;
  z-index: 1000;
  left: 50%;
  bottom: 30px;
  padding: 12px 20px;
  border-radius: 999px;
  background: #24324a;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  font-size: 14px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 10px);
  transition: opacity 0.25s, transform 0.25s;
}

.support-copy-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.support-mobile-line {
  display: none;
}

@media screen and (max-width: 768px) {
  .support-chat-section {
    padding: 10px;
  }

  .support-chat-container {
    height: calc(100dvh - 20px);
    padding: 13px;
    border-radius: 20px;
  }

  .support-chat-close {
    top: 11px;
    right: 11px;
    width: 38px;
    height: 38px;
  }

  .support-chat-heading {
    justify-content: flex-start;
    gap: 10px;
    min-height: 44px;
    margin-bottom: 11px;
    padding-right: 43px;
  }

  .support-chat-heading__icon {
    flex-basis: 42px;
    width: 42px;
    height: 42px;
    border-radius: 13px;
    font-size: 24px;
  }

  .support-chat-heading__eyebrow {
    font-size: 11px;
  }

  .support-chat-heading h2 {
    font-size: 19px;
    line-height: 1.3;
  }

  .support-chat-window {
    border-radius: 18px;
  }

  .support-chat-window__bar {
    padding: 14px 17px;
    font-size: 13px;
  }

  .support-chat-body {
    padding: 19px 13px;
  }

  .support-chat-message {
    gap: 8px;
  }

  .support-chat-avatar {
    flex-basis: 36px;
    width: 36px;
    height: 36px;
    border-radius: 11px;
    font-size: 19px;
  }

  .support-chat-bubble {
    max-width: calc(100% - 44px);
    padding: 13px 15px;
    font-size: 13px;
  }

  .support-diagnosis,
  .support-faq,
  .support-chat-help {
    margin-left: 44px;
  }

  .support-diagnosis__intro,
  .support-diagnosis__panel {
    padding: 18px 14px;
    border-radius: 14px;
  }

  .support-diagnosis h3,
  .support-diagnosis h4 {
    font-size: 17px;
  }

  .support-diagnosis__options {
    grid-template-columns: 1fr;
  }

  .support-faq__item summary {
    padding: 14px 42px 14px 14px;
    font-size: 13px;
  }

  .support-faq__answer {
    padding: 3px 15px 17px;
    font-size: 13px;
  }

  .support-chat-help {
    padding: 19px 15px;
  }

  .support-chat-help h3 {
    font-size: 17px;
  }

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

  .support-mobile-line {
    position: fixed;
    z-index: 110;
    right: 12px;
    bottom: max(12px, env(safe-area-inset-bottom));
    left: 12px;
    display: flex;
    min-height: 54px;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border-radius: 14px;
    background: #06c755;
    color: #fff;
    box-shadow: 0 8px 24px rgba(6, 137, 61, 0.3);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
  }

  .support-mobile-line .material-symbols-rounded {
    font-size: 21px;
  }

  body {
    padding-bottom: 78px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .support-chat-section *,
  .support-copy-toast {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}