:root {
  --canvas: #FFFFFF;
  --surface: #F7F7F8;
  --surface-raised: #FFFFFF;
  --ink: #0A0A0A;
  --ink-secondary: #0A0A0AB3;
  --ink-tertiary: #0A0A0A66;
  --hairline: #0A0A0A1F;
  --accent: #0076CA;
  --accent-ink: #FFFFFF;
  --danger: #C4291C;
  --danger-surface: #FDECEA;
  --badge-surface: #FFF4D6;
  --badge-ink: #7A5B00;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #000000;
    --surface: #121212;
    --surface-raised: #1A1A1A;
    --ink: #F5F5F5;
    --ink-secondary: #F5F5F5B3;
    --ink-tertiary: #F5F5F566;
    --hairline: #F5F5F526;
    --accent: #3B9EFF;
    --accent-ink: #04121F;
    --danger: #FF6B60;
    --danger-surface: #3A1512;
    --badge-surface: #3A2E00;
    --badge-ink: #FFD966;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

a {
  color: var(--accent);
}

/* Header */

.app-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  background: var(--canvas);
  z-index: 10;
}

.app-header .mark {
  width: 26px;
  height: 26px;
  display: block;
}

.app-header .wordmark {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.app-header .subtitle {
  font-size: 13px;
  color: var(--ink-tertiary);
  margin-left: 2px;
  padding-left: 10px;
  border-left: 1px solid var(--hairline);
}

.app-header .spacer {
  flex: 1;
}

.sign-out-button {
  appearance: none;
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--ink-secondary);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}

.sign-out-button:hover {
  background: var(--surface);
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

/* Login */

.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.login-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.login-brand .mark {
  width: 56px;
  height: 56px;
}

.login-brand .wordmark {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.login-brand .tagline {
  color: var(--ink-tertiary);
  font-size: 13px;
  margin: 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-secondary);
}

.field input, .field textarea {
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 10px 12px;
  background: var(--surface-raised);
  color: var(--ink);
}

.field input:focus, .field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.primary-button {
  appearance: none;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.primary-button:disabled {
  opacity: 0.5;
  cursor: default;
}

.primary-button:not(:disabled):hover {
  filter: brightness(1.05);
}

.error-banner {
  background: var(--danger-surface);
  color: var(--danger);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
}

.hint {
  color: var(--ink-tertiary);
  font-size: 12px;
}

/* Ticket list */

.list-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
  flex-wrap: wrap;
}

.status-tabs {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border-radius: 10px;
  padding: 3px;
}

.status-tabs button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-secondary);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.status-tabs button[aria-pressed="true"] {
  background: var(--surface-raised);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.refresh-button {
  appearance: none;
  border: 1px solid var(--hairline);
  background: transparent;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--ink-secondary);
  cursor: pointer;
}

.ticket-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ticket-row {
  display: block;
  width: 100%;
  text-align: left;
  appearance: none;
  border: 1px solid var(--hairline);
  background: var(--surface-raised);
  border-radius: 12px;
  padding: 14px 16px;
  cursor: pointer;
}

.ticket-row:hover {
  border-color: var(--accent);
}

.ticket-row-top {
  display: flex;
  align-items: baseline;
  gap: 8px;
  justify-content: space-between;
}

.ticket-subject {
  font-weight: 600;
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ticket-time {
  color: var(--ink-tertiary);
  font-size: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}

.ticket-row-bottom {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 8px;
  border-radius: 999px;
}

.badge-waiting {
  background: var(--badge-surface);
  color: var(--badge-ink);
}

.badge-status-closed {
  background: var(--hairline);
  color: var(--ink-tertiary);
}

.empty-state {
  color: var(--ink-tertiary);
  text-align: center;
  padding: 48px 16px;
  font-size: 14px;
}

/* Ticket detail */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 16px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.detail-subject {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 4px;
}

.detail-meta {
  color: var(--ink-tertiary);
  font-size: 13px;
}

.close-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.danger-button {
  appearance: none;
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--danger);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.danger-button:hover {
  background: var(--danger-surface);
}

.confirm-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-secondary);
}

.confirm-row .danger-button.solid {
  background: var(--danger);
  color: #FFFFFF;
  border-color: transparent;
}

.confirm-row .cancel-link {
  background: none;
  border: none;
  color: var(--ink-tertiary);
  cursor: pointer;
  font-size: 13px;
}

.thread {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.message {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-from-founder {
  align-self: flex-end;
  background: var(--accent);
  color: var(--accent-ink);
  border-bottom-right-radius: 4px;
}

.message-from-user {
  align-self: flex-start;
  background: var(--surface);
  color: var(--ink);
  border-bottom-left-radius: 4px;
}

.message-meta {
  font-size: 11px;
  opacity: 0.75;
  margin-top: 4px;
  display: block;
}

.composer {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
}

.composer textarea {
  min-height: 88px;
  resize: vertical;
}

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

.closed-notice {
  color: var(--ink-tertiary);
  font-size: 13px;
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
}

.loading, .status-text {
  color: var(--ink-tertiary);
  font-size: 14px;
  padding: 24px 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}