:root {
  --bg-app: #f7f6f2;
  --bg-surface: #ffffff;
  --bg-sidebar: #f0efe9;
  --bg-subtle: #ebe9e1;
  --text-primary: #191a1c;
  --text-secondary: #585c65;
  --text-muted: #868b96;
  --border-color: #e2e0d8;
  --accent: #1f5eff;
  --accent-hover: #1749cc;
  --accent-soft: #eaf0ff;
  --user-bubble: #1f5eff;
  --user-bubble-text: #ffffff;

  --tier-pending-bg: #f3f4f6;
  --tier-pending-fg: #4b5563;
  --tier-flash-low-bg: #e7f6ee;
  --tier-flash-low-fg: #0e7345;
  --tier-flash-high-bg: #e8f1ff;
  --tier-flash-high-fg: #1952c7;
  --tier-carbon-bg: #f4ebff;
  --tier-carbon-fg: #6c2bd9;

  --danger: #d92d20;
  --warning: #d97706;
  --success: #0e8a52;

  --font-scale: 1;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(20, 22, 26, 0.05);
  --shadow-md: 0 10px 30px rgba(20, 22, 26, 0.09);
}

body.large-text {
  --font-scale: 1.18;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Malgun Gothic",
    "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background: var(--bg-app);
  color: var(--text-primary);
  font-size: calc(16px * var(--font-scale));
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.hidden {
  display: none !important;
}

/* --- 입장(로그인) 게이트 화면 --- */
.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: radial-gradient(circle at 20% 15%, #e8eeff 0%, #f7f6f2 55%, #efeae0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 430px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
}

.auth-logo {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, #1f5eff, #6c2bd9);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.auth-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.auth-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.demo-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  background: #fff7ed;
  color: #b45309;
  border: 1px solid #fed7aa;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.field-label {
  display: block;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.member-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.member-chip {
  border: 1px solid var(--border-color);
  background: var(--bg-app);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.member-chip:hover {
  border-color: var(--accent);
}

.member-chip.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.pin-hero-input {
  width: 100%;
  padding: 15px 16px;
  border-radius: 16px;
  border: 2px solid var(--border-color);
  background: var(--bg-app);
  text-align: center;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: 0.45em;
  text-indent: 0.45em;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  margin-bottom: 14px;
}

.pin-hero-input::placeholder {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: normal;
  text-indent: 0;
  color: var(--text-muted);
}

.pin-hero-input:focus {
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(31, 94, 255, 0.14);
}

.text-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: #fff;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  margin-bottom: 16px;
}

.text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 94, 255, 0.14);
}

.primary-btn {
  width: 100%;
  padding: 13px 18px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.primary-btn:hover {
  background: var(--accent-hover);
}

.auth-error {
  color: var(--danger);
  font-size: 0.86rem;
  margin-bottom: 12px;
  font-weight: 500;
}

.privacy-foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

/* --- 메인 앱 레이아웃 --- */
.app-shell {
  display: flex;
  height: 100dvh;
  width: 100%;
  overflow: hidden;
}

/* 사이드바 */
.sidebar {
  width: 280px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.22s ease;
}

.sidebar-header {
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 1.02rem;
}

.brand-dot {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: linear-gradient(135deg, #1f5eff, #6c2bd9);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}

.new-chat-btn {
  margin: 0 14px 12px;
  padding: 11px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.new-chat-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.room-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.room-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: background 0.12s ease;
}

.room-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

.room-item.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.room-item-info {
  min-width: 0;
  flex: 1;
}

.room-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.room-meta {
  font-size: 0.74rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 2px;
}

.room-del-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  font-size: 0.85rem;
  opacity: 0.65;
}

.room-del-btn:hover {
  opacity: 1;
  color: var(--danger);
  background: rgba(217, 45, 32, 0.08);
}

.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.profile-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.avatar-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
}

.ghost-btn {
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.ghost-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

/* 메인 채팅 영역 */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-app);
}

.topbar {
  min-height: 60px;
  padding: 10px 18px;
  background: rgba(247, 246, 242, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.menu-btn {
  display: none;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

/* 모델 상태 배지 */
.tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  transition: all 0.2s ease;
}

.tier-badge.pending {
  background: var(--tier-pending-bg);
  color: var(--tier-pending-fg);
}

.tier-badge.flash_low {
  background: var(--tier-flash-low-bg);
  color: var(--tier-flash-low-fg);
}

.tier-badge.flash_high {
  background: var(--tier-flash-high-bg);
  color: var(--tier-flash-high-fg);
}

.tier-badge.carbon {
  background: var(--tier-carbon-bg);
  color: var(--tier-carbon-fg);
}

.tier-select {
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  border-radius: 999px;
  padding: 5px 11px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
}

.budget-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.budget-pill:hover {
  border-color: var(--accent);
}

.mini-bar {
  display: inline-block;
  width: 44px;
  height: 7px;
  background: var(--bg-subtle);
  border-radius: 999px;
  overflow: hidden;
}

.mini-bar-fill {
  display: block;
  height: 100%;
  background: var(--success);
  transition: width 0.3s ease;
}

/* 메시지 영역 */
.messages-wrap {
  flex: 1;
  overflow-y: auto;
  padding: 24px 18px 16px;
}

.messages-inner {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* 첫 화면 웰컴 상태 */
.welcome-box {
  max-width: 720px;
  margin: 3vh auto 0;
  text-align: center;
  padding: 16px 8px;
}

.welcome-title {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.welcome-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.starter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  text-align: left;
}

.starter-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 15px 16px;
  cursor: pointer;
  transition: transform 0.14s ease, border-color 0.14s ease, box-shadow 0.14s ease;
}

.starter-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.starter-tag {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 7px;
}

.starter-card h4 {
  font-size: 0.96rem;
  margin-bottom: 4px;
}

.starter-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
}

/* 말풍선 */
.msg-row {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.msg-row.user {
  align-items: flex-end;
}

.msg-row.model {
  align-items: flex-start;
}

.msg-bubble {
  max-width: 88%;
  padding: 13px 17px;
  border-radius: 18px;
  word-break: break-word;
}

.msg-row.user .msg-bubble {
  background: var(--user-bubble);
  color: var(--user-bubble-text);
  border-bottom-right-radius: 5px;
  white-space: pre-wrap;
}

.msg-row.model .msg-bubble {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 5px;
  box-shadow: var(--shadow-sm);
  width: 100%;
  max-width: 100%;
}

.msg-att-preview {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.msg-att-preview img {
  max-height: 180px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.sources-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-color);
}

.source-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  text-decoration: none;
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.source-pill:hover {
  background: #dbe6ff;
}

.key-alert-banner {
  background: #fff7ed;
  border-bottom: 1px solid #fed7aa;
  color: #9a3412;
  padding: 9px 18px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.msg-meta {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
}

/* 마크다운 렌더링 */
.md-body p {
  margin-bottom: 10px;
}
.md-body p:last-child {
  margin-bottom: 0;
}
.md-body h1,
.md-body h2,
.md-body h3 {
  margin: 14px 0 8px;
  line-height: 1.35;
}
.md-body ul,
.md-body ol {
  margin: 8px 0 12px 22px;
}
.md-body li {
  margin-bottom: 4px;
}
.md-body code {
  background: #f2f1ec;
  padding: 2px 6px;
  border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}
.md-body pre {
  background: #1d1f23;
  color: #f4f4f6;
  padding: 14px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 10px 0;
}
.md-body pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}
.md-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 12px;
  color: var(--text-secondary);
  margin: 8px 0;
}

/* 입력 영역 */
.composer-wrap {
  padding: 10px 18px 16px;
  background: linear-gradient(180deg, rgba(247, 246, 242, 0) 0%, var(--bg-app) 28%);
}

.composer-box {
  max-width: 780px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 10px 12px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.composer-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 94, 255, 0.12);
}

.attachment-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 4px 8px;
}

.att-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 4px 10px;
  font-size: 0.8rem;
}

.att-chip button {
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--danger);
  font-weight: 700;
}

.composer-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-app);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.05rem;
}

.icon-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#chatInput {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  min-height: 38px;
  max-height: 170px;
  padding: 6px 4px;
  line-height: 1.5;
}

.send-btn {
  height: 38px;
  padding: 0 16px;
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  flex-shrink: 0;
}

.send-btn:disabled {
  background: #b7c3e0;
  cursor: not-allowed;
}

.composer-foot {
  max-width: 780px;
  margin: 7px auto 0;
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0 6px;
}

/* 예산 모달 */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(15, 18, 24, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-surface);
  border-radius: 22px;
  padding: 24px;
  box-shadow: var(--shadow-md);
  max-height: 88dvh;
  overflow-y: auto;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-head h3 {
  font-size: 1.18rem;
}

.stat-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.stat-box {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 12px 14px;
}

.stat-box .lbl {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.stat-box .val {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2px;
}

.big-meter {
  height: 12px;
  background: var(--bg-subtle);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 18px;
}

.big-meter-fill {
  height: 100%;
  background: linear-gradient(90deg, #0e8a52, #1f5eff);
  transition: width 0.3s ease;
}

.usage-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 16px;
}

.usage-table th,
.usage-table td {
  padding: 8px 6px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.usage-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
}

.offset-row {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.offset-row input {
  flex: 1;
  margin-bottom: 0;
  padding: 8px 12px;
}

/* 모바일 반응형 */
.sidebar-scrim {
  display: none;
}

@media (max-width: 820px) {
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 60;
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-scrim.open {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 55;
    background: rgba(0, 0, 0, 0.35);
  }
  .menu-btn {
    display: inline-flex;
  }
  .starter-grid {
    grid-template-columns: 1fr;
  }
  .msg-bubble {
    max-width: 94%;
  }
}