:root {
  --font-ui: "Segoe UI", "Yu Gothic UI", "Hiragino Sans", "Meiryo", sans-serif;
  --app-shell-max-width: 920px;
  --app-shell-half-width: calc(var(--app-shell-max-width) / 2);
  --page-bg: linear-gradient(180deg, #eaf7f4 0%, #dfeff8 100%);
  --panel: rgba(255, 255, 255, 0.96);
  --border: rgba(25, 52, 73, 0.12);
  --text: #14324b;
  --muted: #61788f;
  --accent: #0f8f7b;
  --accent-dark: #0c7464;
  --accent-rgb: 15, 143, 123;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  color: var(--text);
  background: var(--page-bg);
  padding: 24px 16px;
  display: grid;
  place-items: start center;
}

input,
button,
textarea,
select {
  font: inherit;
}

.app {
  position: relative;
  --card-fixed-edge-gap: max(16px, calc(50% - var(--app-shell-half-width)));
  --top-nav-button-size: calc(38px + var(--app-font-size-offset, 0px));
  --top-nav-icon-size: calc(20px + var(--app-font-size-offset, 0px));
  --top-nav-radius: calc(12px + (var(--app-font-size-offset, 0px) / 2));
  --top-nav-ticket-font-size: calc(13px + var(--app-font-size-offset, 0px));
  --top-nav-ticket-gap: calc(4px + (var(--app-font-size-offset, 0px) / 2));
  --top-nav-ticket-padding-x: calc(8px + (var(--app-font-size-offset, 0px) / 2));
  --top-nav-top: calc(30px + var(--app-font-size-offset, 0px));
  --top-nav-side-offset: calc(8px + (var(--app-font-size-offset, 0px) / 2));
  --top-search-top: calc(72px + var(--app-font-size-offset, 0px));
  --top-search-width: calc(100px + (var(--app-font-size-offset, 0px) * 3));
  --top-search-height: calc(28px + var(--app-font-size-offset, 0px));
  --top-search-radius: calc(10px + (var(--app-font-size-offset, 0px) / 2));
  --top-search-gap: calc(6px + (var(--app-font-size-offset, 0px) / 2));
  --top-search-font-size: calc(11px + var(--app-font-size-offset, 0px));
  --top-search-padding-x: calc(9px + (var(--app-font-size-offset, 0px) / 2));
  width: min(100%, var(--app-shell-max-width));
  min-width: 0;
  border-radius: 28px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: 0 24px 45px rgba(21, 43, 62, 0.14);
  padding: 28px;
  display: grid;
  gap: 18px;
}

.app > section {
  width: 100%;
  max-width: none;
  justify-self: stretch;
}

.top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: calc(30px + var(--app-font-size-offset, 0px));
  padding-right: calc(150px + (var(--app-font-size-offset, 0px) * 3));
}

.top-row > h1 {
  margin: 0 0 0 8px;
  font-size: clamp(26px, 4.6vw, 38px);
}

.top-nav {
  display: contents;
}

.top-nav-link {
  width: var(--top-nav-button-size);
  min-height: var(--top-nav-button-size);
  border: none;
  border-radius: var(--top-nav-radius);
  background: rgba(255, 255, 255, 0.85);
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--accent);
  text-decoration: none;
}

.top-nav-link:hover {
  background: rgba(var(--accent-rgb), 0.1);
}

.top-nav-link svg {
  width: var(--top-nav-icon-size);
  height: var(--top-nav-icon-size);
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ticket-nav-link {
  width: auto;
  min-width: 0;
  padding: 0 var(--top-nav-ticket-padding-x);
  gap: var(--top-nav-ticket-gap);
  font-size: var(--top-nav-ticket-font-size);
  font-weight: 700;
  white-space: nowrap;
}

.ticket-points {
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.nav-right-2 {
  position: fixed;
  top: var(--top-nav-top);
  right: calc(var(--card-fixed-edge-gap) + 48px + var(--app-font-size-offset, 0px));
  z-index: 20;
}

.nav-right-3 {
  position: fixed;
  top: var(--top-nav-top);
  right: calc(var(--card-fixed-edge-gap) + var(--top-nav-side-offset));
  z-index: 20;
}

.back-nav-button {
  position: fixed;
  top: var(--top-nav-top);
  left: calc(var(--card-fixed-edge-gap) + var(--top-nav-side-offset));
  z-index: 20;
}

.back-search-form {
  position: fixed;
  top: var(--top-search-top);
  right: calc(var(--card-fixed-edge-gap) + calc(10px + (var(--app-font-size-offset, 0px) / 2)));
  z-index: 20;
  width: max-content;
  display: grid;
  grid-template-columns: var(--top-search-width) auto;
  gap: var(--top-search-gap);
  align-items: stretch;
}

.back-search-input {
  min-width: 0;
  width: var(--top-search-width);
  height: var(--top-search-height);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: var(--top-search-radius);
  background: rgba(255, 255, 255, 0.96);
  padding: 0 var(--top-search-padding-x);
  font-size: var(--top-search-font-size);
  color: var(--text);
}

.back-search-submit,
.action-btn,
.ghost-btn {
  min-height: 42px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.back-search-submit,
.action-btn {
  border: none;
  background: var(--accent);
  color: #ffffff;
  padding: 0 16px;
}

.ghost-btn {
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  background: #ffffff;
  color: var(--text);
  padding: 0 16px;
}

.hero-card,
.panel {
  width: 100%;
  max-width: none;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.92);
  padding: 18px;
}

.hero-card {
  border-color: rgba(var(--accent-rgb), 0.22);
  background: rgba(var(--accent-rgb), 0.09);
}

.composer-panel,
.history-panel {
  width: 100%;
  max-width: none;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lead,
.status,
.message-date,
.pagination-status,
.message-user {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.panel-header {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
}

.panel-header-inline {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.toolbar-actions {
  justify-self: end;
}

.panel-header h2 {
  margin: 0;
  font-size: 14px;
}

.status[data-state="error"] {
  color: var(--danger);
}

.composer-form,
.field {
  display: grid;
  gap: 8px;
}

.composer-form {
  gap: 14px;
  width: 100%;
}

.field span {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.input-text,
.input-textarea,
.input-select,
.input-file {
  width: 100%;
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
}

.input-text,
.input-select {
  min-height: 46px;
  padding: 0 14px;
}

.input-textarea {
  min-height: 180px;
  padding: 14px;
  resize: vertical;
}

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

.input-file-shell {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 54px;
  padding: 8px;
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.96);
}

.input-file-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 38px;
  padding: 0 16px;
  border-radius: 12px;
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.input-file-trigger:hover {
  background: rgba(var(--accent-rgb), 0.16);
}

.input-file:focus-visible + .input-file-trigger,
.input-file-shell:focus-within .input-file-trigger {
  outline: 2px solid rgba(var(--accent-rgb), 0.35);
  outline-offset: 2px;
}

.input-file-summary {
  min-width: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  word-break: break-word;
}

.attachment-preview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.attachment-empty,
.message-empty {
  margin: 0;
  padding: 18px;
  border: 1px dashed rgba(var(--accent-rgb), 0.18);
  border-radius: 16px;
  color: var(--muted);
  background: rgba(var(--accent-rgb), 0.03);
}

.attachment-card {
  margin: 0;
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 18px;
  background: rgba(var(--accent-rgb), 0.04);
  overflow: hidden;
}

.attachment-card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.attachment-card-caption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
  word-break: break-all;
}

.composer-actions,
.toolbar-actions,
.pagination-row {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  align-items: center;
}

.composer-panel .status {
  min-height: 22px;
}

.message-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.message-item {
  border: 1px solid rgba(var(--accent-rgb), 0.14);
  border-radius: 18px;
  background: rgba(var(--accent-rgb), 0.04);
  padding: 16px;
  display: grid;
  gap: 10px;
}

.message-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.message-category {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.message-subject {
  margin: 0;
  font-size: 19px;
  word-break: break-word;
}

.message-body {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.7;
}

.message-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.message-status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
}

.message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.message-attachment-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  color: var(--text);
  text-decoration: none;
}

.message-replies {
  display: grid;
  gap: 10px;
  padding-top: 6px;
  border-top: 1px solid rgba(var(--accent-rgb), 0.12);
}

.message-replies-title {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.message-reply-item {
  display: grid;
  gap: 6px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(var(--accent-rgb), 0.08);
}

.message-reply-date {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.message-reply-body {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.7;
}

@media (max-width: 720px) {
  body {
    padding: 12px;
  }

  .app {
    padding: 20px 16px 24px;
    border-radius: 22px;
  }

  .top-row {
    padding-right: 0;
    margin-top: calc(var(--top-nav-button-size) + 18px);
  }

  .input-file-shell {
    flex-direction: column;
    align-items: stretch;
  }

  .input-file-trigger {
    width: 100%;
  }

  .back-search-form {
    position: static;
    width: 100%;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .nav-right-2,
  .nav-right-3,
  .back-nav-button {
    position: fixed;
  }

  .message-item-header,
  .message-meta,
  .pagination-row {
    grid-template-columns: 1fr;
    justify-content: stretch;
  }

  .panel-header-inline {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: 12px;
  }

  .pagination-row {
    justify-content: space-between;
  }
}