/* customer 网页客户端样式。
   视觉语言与知了hub 对齐：深色水泥灰基调、低饱和灰绿主操作、圆形「知」标记、
   克制的编辑式层级；页面结构与 customer 既有业务边界保持不变。 */

:root {
  color-scheme: dark;
  --black: #11191d;
  --text: #eff2f3;
  --muted: #b7c0c3;
  --subtle: #929fa4;
  --placeholder: var(--subtle);
  --selection-bg: var(--primary);
  --selection-text: var(--on-primary);
  --scrollbar-thumb: var(--subtle);
  --scrollbar-track: var(--bg);
  --line: rgba(239, 242, 243, .14);
  --line-strong: rgba(239, 242, 243, .22);
  --bg: #20292e;
  --surface: #29343a;
  --surface-low: #172025;
  --surface-high: #344047;
  --primary: #b3b7a4;
  --primary-hover: #c6cab9;
  --primary-soft: #3a4541;
  --danger: #dc9188;
  --danger-bg: #3b2929;
  --success: #9bbcaf;
  --success-bg: #263831;
  --warning: #d8b071;
  --warning-bg: #3a3024;
  --on-primary: #20292e;
  --accent-line: rgba(179, 183, 164, .44);
  --sidebar-bg: #172025;
  --session-hover-bg: rgba(239, 242, 243, .06);
  --welcome-bg: rgba(41, 52, 58, .96);
  --header-bg: rgba(23, 32, 37, .96);
  --bubble-shadow: 0 6px 22px rgba(0, 0, 0, .14);
  --session-shadow: 0 5px 18px rgba(0, 0, 0, .16);
  --sidebar-shadow: 14px 0 40px rgba(0, 0, 0, .34);
  --backdrop-bg: rgba(0, 0, 0, .62);
  --primary-shadow: 0 7px 18px rgba(179, 183, 164, .12);
  --primary-active-shadow: 0 4px 12px rgba(179, 183, 164, .16);
  --radius: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow: 0 18px 48px rgba(0, 0, 0, .24);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  --duration-fast: 140ms;
  --duration-base: 220ms;
  --ease: cubic-bezier(.22, 1, .36, 1);
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

* { box-sizing: border-box; }

::selection {
  background: var(--selection-bg);
  color: var(--selection-text);
}

.session-list,
.chat-log,
textarea {
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.025em; }

input, textarea, button, select { font-family: inherit; font-size: 14px; }

input, textarea {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-low);
  color: var(--text);
  transition: border-color var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease);
}

input::placeholder,
textarea::placeholder {
  color: var(--placeholder);
  opacity: 1;
}

input:focus, textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-soft);
}

button {
  padding: 11px 17px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 650;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease), transform var(--duration-fast) var(--ease);
}

button:hover { background: var(--primary-hover); transform: translateY(-1px); }
button:active { transform: translateY(0); }
button:disabled { opacity: .55; cursor: not-allowed; transform: none; }
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

button.secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--text);
}

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

.muted { color: var(--muted); }
.eyebrow {
  margin: 0 0 6px;
  color: var(--subtle);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.form-stack { display: grid; gap: 14px; }
.form-stack label { display: grid; gap: 7px; color: var(--text); font-size: 13px; font-weight: 600; }
.btn-block { width: 100%; min-height: 46px; }

.message { min-height: 20px; margin-top: 10px; font-size: 13px; font-weight: 600; }
.message.success { color: var(--success); }
.message.error { color: var(--danger); }

.password-field { position: relative; display: block; }
.password-field input { width: 100%; padding-right: 64px; }
.password-field button {
  position: absolute;
  top: 50%;
  right: 6px;
  padding: 4px 10px;
  transform: translateY(-50%);
  border-color: var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
}

/* ---------- 认证页：与管理后台auth-shell同构 ---------- */

.auth-page { background: var(--surface-low); }

.auth-shell {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  min-height: 100vh;
}

.auth-intro {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 56px 60px;
  border-right: 1px solid var(--line);
  background: var(--bg);
}

.auth-intro h1 { max-width: 500px; font-size: clamp(32px, 3.8vw, 52px); line-height: 1.16; }
.auth-intro p { max-width: 470px; margin-top: 20px; color: var(--muted); font-size: 15px; }
.auth-intro small { color: var(--muted); font-size: 12px; }

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  margin: 0 0 40px;
  border: 1px solid var(--accent-line);
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 17px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease), transform var(--duration-fast) var(--ease);
  place-items: center;
}

.brand-mark:hover { background: var(--primary-hover); transform: rotate(-6deg); }

.auth-assurances { display: grid; max-width: 500px; gap: 13px; margin-top: 40px; font-size: 13px; }
.auth-assurances span { padding-top: 13px; border-top: 1px solid var(--line-strong); color: var(--muted); }

.auth-form-area {
  display: grid;
  padding: 40px 32px;
  background: var(--surface-low);
  place-items: center;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.auth-heading { margin-bottom: 22px; }
.auth-heading h1 { font-size: 23px; line-height: 1.3; }
.auth-heading p { margin: 8px 0 0; font-size: 13px; }

.auth-link { margin-top: 18px; font-size: 13px; text-align: center; }
.auth-link a { color: var(--primary-hover); font-weight: 600; text-decoration: none; }
.auth-link a:hover { text-decoration: underline; }
.auth-footer { margin-top: 22px; color: var(--subtle); font-size: 11px; text-align: center; }

.cross-site-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-low);
  color: var(--text);
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease);
}

.cross-site-link:hover { border-color: var(--accent-line); background: var(--surface-high); color: var(--primary-hover); }
.cross-site-link-copy { display: grid; min-width: 0; gap: 2px; }
.cross-site-link small { color: var(--subtle); font-family: var(--font-mono); font-size: 9px; font-weight: 600; letter-spacing: .12em; }
.cross-site-link strong { font-size: 12px; font-weight: 600; }
.cross-site-link-arrow { font-size: 18px; transition: transform var(--duration-fast) var(--ease); }
.cross-site-link:hover .cross-site-link-arrow { transform: translateX(3px); }
.auth-cross-site { margin-top: 18px; }

.code-field { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.code-field button { min-width: 108px; }

/* ---------- 聊天工作台 ---------- */

.chat-page { height: 100vh; height: 100dvh; overflow: hidden; }

.workspace-shell {
  display: grid;
  grid-template-columns: 282px minmax(0, 1fr);
  height: 100%;
}

.chat-sidebar {
  z-index: 20;
  display: flex;
  min-height: 0;
  flex-direction: column;
  padding: 20px 14px 14px;
  border-right: 1px solid var(--line);
  background: var(--sidebar-bg);
}

.sidebar-brand { display: flex; align-items: center; gap: 11px; padding: 2px 6px 18px; }
.sidebar-brand .brand-mark { width: 38px; height: 38px; margin: 0; font-size: 16px; }
.sidebar-brand strong { display: block; font-size: 16px; }
.sidebar-brand small { display: block; color: var(--muted); font-size: 11px; }
.sidebar-cross-site { margin: -4px 6px 16px; padding: 10px 12px; }

.new-chat-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 100%;
  min-height: 43px;
  margin-bottom: 20px;
  box-shadow: var(--primary-shadow);
}

.new-chat-button span { font-size: 19px; font-weight: 400; line-height: 1; }

.history-panel { display: flex; min-height: 0; flex: 1; flex-direction: column; }
.history-heading { display: flex; align-items: center; justify-content: space-between; padding: 0 6px 8px; }
.history-heading h2 { color: var(--muted); font-size: 12px; letter-spacing: .04em; }

button.text-button {
  padding: 2px 5px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
}

button.text-button:hover { background: transparent; color: var(--primary-hover); }

.session-status { margin: 0; padding: 0 6px 7px; color: var(--subtle); font-size: 11px; }
.session-list { display: grid; min-height: 0; gap: 4px; overflow-y: auto; align-content: start; }

.session-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
}

.session-item { transition: border-color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease); }
.session-item:hover { border-color: var(--line); background: var(--session-hover-bg); }
.session-item.active { border-color: var(--accent-line); background: var(--surface); box-shadow: var(--session-shadow); }

button.session-open {
  display: grid;
  min-width: 0;
  gap: 2px;
  padding: 10px 8px 10px 11px;
  border: none;
  background: transparent;
  color: var(--text);
  text-align: left;
}

button.session-open:hover { background: transparent; }
.session-open strong { overflow: hidden; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.session-open span { overflow: hidden; color: var(--subtle); font-size: 10px; font-weight: 400; text-overflow: ellipsis; white-space: nowrap; }

button.session-delete {
  padding: 5px 7px;
  margin-right: 4px;
  border: none;
  background: transparent;
  color: var(--danger);
  font-size: 10px;
  font-weight: 500;
  opacity: 0;
}

.session-item:hover .session-delete,
.session-delete:focus { opacity: 1; }
button.session-delete:hover { background: var(--danger-bg); }

.sidebar-account {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 12px;
  padding: 12px 6px 0;
  border-top: 1px solid var(--line-strong);
}

.account-copy { min-width: 0; }
.account-copy span { display: block; color: var(--subtle); font-size: 10px; }
.account-copy strong { display: block; overflow: hidden; font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-account button { padding: 6px 9px; font-size: 11px; }

.sidebar-settings-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 10px 6px 0;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease);
}

.sidebar-settings-link:hover {
  border-color: var(--accent-line);
  background: var(--surface);
  color: var(--primary-hover);
}

.chat-main { display: flex; min-width: 0; min-height: 0; flex-direction: column; background: var(--bg); }

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 86px;
  padding: 13px 28px;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
}

.chat-title-area { display: flex; align-items: center; min-width: 0; gap: 12px; }
.chat-title-area .eyebrow { margin-bottom: 1px; }
.chat-title-area h1 { overflow: hidden; max-width: 420px; font-size: 17px; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-toggle { display: none; padding: 7px 10px; font-size: 12px; }
.sidebar-backdrop { display: none; }

.mode-area { display: flex; align-items: center; gap: 13px; }
.mode-switch { display: flex; gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-low); }

button.mode-option {
  display: grid;
  gap: 0;
  min-width: 82px;
  padding: 6px 12px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  text-align: left;
}

button.mode-option:hover { background: var(--surface-high); }
button.mode-option.active { background: var(--primary); color: var(--on-primary); box-shadow: var(--primary-active-shadow); }
.mode-option span { font-size: 12px; }
.mode-option small { font-size: 9px; font-weight: 400; opacity: .8; }
.mode-description { max-width: 250px; margin: 0; color: var(--muted); font-size: 10px; line-height: 1.4; }

.chat-log { flex: 1; min-height: 0; overflow-y: auto; padding: 32px 28px 42px; }
.chat-log-inner { display: flex; min-height: 100%; max-width: 880px; margin: 0 auto; flex-direction: column; gap: 18px; }

.chat-welcome {
  width: min(100%, 620px);
  margin: auto;
  padding: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--welcome-bg);
  box-shadow: var(--shadow);
  text-align: center;
}

.welcome-mark {
  display: grid;
  width: 46px;
  height: 46px;
  margin: 0 auto 17px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 17px;
  font-weight: 600;
  place-items: center;
}

.chat-welcome h2 { font-size: 22px; }
.chat-welcome p { max-width: 470px; margin: 9px auto 22px; color: var(--muted); font-size: 13px; }
.welcome-tips { display: flex; flex-wrap: wrap; justify-content: center; gap: 7px; }
.welcome-tips span { padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface-low); color: var(--muted); font-size: 11px; }

.chat-empty { margin: auto; padding: 40px 20px; color: var(--muted); text-align: center; }
.chat-empty.error { color: var(--danger); }

.bubble {
  max-width: 82%;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--bubble-shadow);
  line-height: 1.78;
  white-space: pre-wrap;
  word-break: break-word;
}

.bubble.user { align-self: flex-end; border-color: var(--accent-line); border-bottom-right-radius: 5px; background: var(--primary-soft); }
.bubble.assistant { align-self: flex-start; border-bottom-left-radius: 5px; }
.bubble.pending { color: var(--muted); font-style: italic; }
.bubble.failed { border-color: var(--danger); background: var(--danger-bg); color: var(--danger); }

.bubble-role { margin-bottom: 6px; color: var(--subtle); font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: .1em; }
.message-attachments { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 9px; }
.message-attachments span { padding: 3px 7px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 10px; }

.generated-file-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  margin-top: 12px;
  padding: 11px;
  border: 1px solid var(--accent-line);
  border-radius: 10px;
  background: var(--primary-soft);
  white-space: normal;
}

.generated-file-card.failed { border-color: var(--danger); background: var(--danger-bg); }
.generated-file-icon {
  display: grid;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .04em;
  place-items: center;
}

.generated-file-copy { min-width: 0; }
.generated-file-copy strong { display: block; overflow: hidden; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.generated-file-status { display: block; margin-top: 2px; color: var(--muted); font-size: 10px; }
.generated-file-card.failed .generated-file-status { color: var(--danger); }
button.generated-file-download { padding: 7px 11px; font-size: 11px; }

/* 引用来源：如实展示后端返回的doc_id/来源/分数，不做任何美化性补全 */
.citations { margin-top: 11px; padding-top: 10px; border-top: 1px dashed var(--line-strong); }
.citations-title { margin-bottom: 6px; color: var(--subtle); font-size: 11px; font-weight: 700; }
.citation-item { display: flex; flex-wrap: wrap; gap: 6px 10px; padding: 4px 0; font-size: 12px; }
.citation-item .name { font-weight: 600; }
.citation-item .meta { color: var(--muted); }

.chat-composer { padding: 13px 28px 18px; border-top: 1px solid var(--line); background: var(--surface-low); }
.composer-inner { display: grid; max-width: 880px; margin: 0 auto; gap: 8px; }
.composer-row { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 8px; align-items: end; }
.composer-row textarea { min-height: 50px; max-height: 160px; background: var(--surface); resize: vertical; }
.composer-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

.attachment-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.attachment-chip { display: inline-flex; align-items: center; gap: 6px; padding: 3px 8px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface-high); font-size: 12px; }
.attachment-chip button { padding: 0 2px; border: none; background: none; color: var(--muted); font-size: 14px; line-height: 1; }
.attachment-chip button:hover { background: none; color: var(--danger); }
.composer-hint { margin: 0; color: var(--subtle); font-size: 11px; }
.active-mode-label { flex: none; padding: 2px 7px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-hover); font-size: 10px; font-weight: 700; }

/* ---------- API额度设置 ---------- */

.settings-page { min-height: 100vh; background: var(--surface-low); }

.settings-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
  padding: 12px max(22px, calc((100vw - 1040px) / 2));
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
}

.settings-back {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
}

.settings-back:hover { color: var(--primary-hover); }
.settings-account { display: grid; justify-items: end; }
.settings-account span { color: var(--subtle); font-size: 10px; }
.settings-account strong { font-size: 11px; }

.settings-shell {
  width: min(100% - 36px, 1040px);
  margin: 0 auto;
  padding: 64px 0 80px;
}

.settings-heading { max-width: 720px; margin-bottom: 28px; }
.settings-heading h1 { font-size: clamp(28px, 4vw, 42px); }
.settings-heading > p:not(.eyebrow) { margin: 12px 0 0; color: var(--muted); }

.source-summary {
  display: inline-flex;
  margin-top: 20px;
  padding: 7px 11px;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-hover);
  font-size: 12px;
  font-weight: 700;
}

.quota-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }

.quota-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--bubble-shadow);
  transition: border-color var(--duration-base) var(--ease), background var(--duration-base) var(--ease);
}

.quota-card.selected { border-color: var(--accent-line); background: var(--surface-high); }
.quota-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.quota-card-heading h2 { font-size: 20px; }
.quota-description { min-height: 76px; margin: 14px 0 20px; color: var(--muted); font-size: 13px; }

.status-badge {
  flex: none;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--subtle);
  font-size: 10px;
  font-weight: 700;
}

.status-badge.active { border-color: var(--accent-line); background: var(--primary-soft); color: var(--primary-hover); }
.quota-form { display: grid; gap: 10px; }
.quota-form label { color: var(--text); font-size: 12px; font-weight: 650; }
.quota-form input { width: 100%; }
.quota-hint { min-height: 42px; margin: 0; color: var(--subtle); font-size: 11px; }
.quota-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.quota-actions button { min-height: 42px; }

button.danger-button {
  border-color: var(--danger);
  background: var(--danger-bg);
  color: var(--danger);
}

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

.settings-message {
  min-height: 28px;
  margin: 20px 2px 0;
  font-size: 13px;
  font-weight: 650;
}

.settings-message.success { color: var(--success); }
.settings-message.error { color: var(--danger); }

.execution-timeline {
  display: grid;
  gap: 7px;
  margin-top: 12px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-low);
}

.execution-title {
  color: var(--subtle);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
}

.execution-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 11px;
}

.execution-item[data-phase="started"] .execution-detail { color: var(--primary-hover); }
.execution-item[data-phase="degraded"] .execution-detail,
.execution-item[data-phase="failed"] .execution-detail { color: var(--warning); }
.execution-name { color: var(--text); font-weight: 650; }
.execution-detail { text-align: right; }

.request-status-notice {
  margin-top: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--warning-bg);
  color: var(--warning);
  font-size: 11px;
}

@media (max-width: 1280px) {
  .mode-description { display: none; }
}

@media (max-width: 860px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-intro { display: none; }
  .workspace-shell { grid-template-columns: 1fr; }
  .chat-sidebar { position: fixed; inset: 0 auto 0 0; width: min(82vw, 300px); transform: translateX(-102%); box-shadow: var(--sidebar-shadow); transition: transform var(--duration-base) var(--ease); }
  .sidebar-open .chat-sidebar { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; z-index: 15; inset: 0; width: 100%; height: 100%; padding: 0; border: none; border-radius: 0; background: var(--backdrop-bg); opacity: 0; pointer-events: none; transition: opacity var(--duration-base) var(--ease); }
  .sidebar-open .sidebar-backdrop { display: block; opacity: 1; pointer-events: auto; }
  .sidebar-toggle { display: inline-flex; }
  .quota-grid { grid-template-columns: 1fr; }
  .quota-description { min-height: 0; }
}

@media (max-width: 620px) {
  .chat-header { align-items: flex-start; min-height: auto; padding: 10px 12px; }
  .chat-title-area h1 { max-width: 160px; font-size: 15px; }
  .mode-switch { align-self: center; }
  button.mode-option { min-width: 58px; padding: 6px 8px; text-align: center; }
  .mode-option small { display: none; }
  .chat-log { padding: 18px 12px 24px; }
  .chat-composer { padding: 10px 12px 13px; }
  .bubble { max-width: 100%; }
  .generated-file-card { grid-template-columns: auto minmax(0, 1fr); }
  .execution-item { align-items: flex-start; flex-direction: column; gap: 2px; }
  .execution-detail { text-align: left; }
  button.generated-file-download { grid-column: 1 / -1; width: 100%; }
  .chat-welcome { padding: 28px 18px; }
  .composer-row { grid-template-columns: 1fr auto; }
  .composer-row textarea { grid-column: 1 / -1; }
  .composer-meta { align-items: flex-start; }
  .auth-card { padding: 22px; }
  .auth-form-area { padding: 24px 14px; }
  .settings-topbar { min-height: 58px; padding: 10px 16px; }
  .settings-shell { width: min(100% - 24px, 1040px); padding: 36px 0 54px; }
  .settings-heading { margin-bottom: 20px; }
  .settings-heading h1 { font-size: 27px; }
  .source-summary { align-items: flex-start; border-radius: var(--radius); line-height: 1.5; }
  .quota-card { padding: 20px 16px; }
  .quota-card-heading { gap: 10px; }
  .quota-actions { display: grid; grid-template-columns: 1fr; }
  .quota-actions button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }

  button:hover { transform: none; }
}