:root {
  --page-bg:
    radial-gradient(circle at 10% 12%, rgba(255, 128, 171, 0.62) 0, transparent 28%),
    radial-gradient(circle at 86% 10%, rgba(91, 141, 255, 0.62) 0, transparent 30%),
    radial-gradient(circle at 18% 92%, rgba(41, 211, 183, 0.56) 0, transparent 28%),
    radial-gradient(circle at 82% 86%, rgba(255, 190, 103, 0.5) 0, transparent 30%),
    linear-gradient(135deg, #fff1f7 0%, #eef4ff 44%, #e6fff8 100%);
  --page-sheen:
    linear-gradient(120deg, rgba(255, 255, 255, 0.72), transparent 38%, rgba(255, 255, 255, 0.28)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.15) 0 1px, transparent 1px 9px);
  --surface: rgba(255, 255, 255, 0.58);
  --surface-strong: rgba(255, 255, 255, 0.82);
  --surface-solid: rgba(255, 255, 255, 0.9);
  --field: rgba(255, 255, 255, 0.64);
  --ink: #182033;
  --muted: #5f6a7d;
  --line: rgba(84, 95, 122, 0.22);
  --primary: #735cf7;
  --primary-2: #df6a91;
  --accent: #0f9f91;
  --pill-bg: rgba(209, 250, 241, 0.76);
  --pill-ink: #087569;
  --danger: #b42318;
  --danger-bg: rgba(255, 241, 240, 0.9);
  --shadow: 0 24px 76px rgba(69, 62, 112, 0.22);
  --panel-blur: blur(24px) saturate(1.18);
}

body[data-theme="dark"] {
  --page-bg:
    radial-gradient(circle at 12% 14%, rgba(112, 80, 255, 0.42) 0, transparent 30%),
    radial-gradient(circle at 86% 18%, rgba(6, 182, 212, 0.34) 0, transparent 28%),
    radial-gradient(circle at 72% 88%, rgba(219, 39, 119, 0.32) 0, transparent 30%),
    radial-gradient(circle at 18% 82%, rgba(20, 184, 166, 0.24) 0, transparent 28%),
    linear-gradient(135deg, #030712 0%, #0c1020 48%, #020617 100%);
  --page-sheen:
    linear-gradient(120deg, rgba(255, 255, 255, 0.07), transparent 38%, rgba(255, 255, 255, 0.05)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 10px);
  --surface: rgba(8, 13, 28, 0.72);
  --surface-strong: rgba(14, 20, 39, 0.86);
  --surface-solid: rgba(12, 18, 36, 0.94);
  --field: rgba(3, 7, 18, 0.48);
  --ink: #eef3ff;
  --muted: #a9b3c7;
  --line: rgba(190, 203, 235, 0.18);
  --primary: #a78bfa;
  --primary-2: #fb7185;
  --accent: #2dd4bf;
  --pill-bg: rgba(20, 184, 166, 0.16);
  --pill-ink: #72f3df;
  --danger: #fecaca;
  --danger-bg: rgba(127, 29, 29, 0.32);
  --shadow: 0 26px 86px rgba(0, 0, 0, 0.44);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  height: 100vh;
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  background: var(--page-bg);
  background-attachment: fixed;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  transition: background 0.35s ease, color 0.2s ease;
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
}

body::before {
  opacity: 0.92;
  background: var(--page-bg);
  filter: blur(18px) saturate(1.12);
  transform: scale(1.06);
}

body::after {
  opacity: 0.7;
  background: var(--page-sheen);
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button:disabled,
textarea:disabled,
input:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.app-shell {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: min(1180px, calc(100% - 32px));
  height: 100vh;
  min-height: 0;
  margin: 0 auto;
  padding: 18px 0;
}

.hero {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  flex: 0 0 auto;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent),
    var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: var(--panel-blur);
}

.brand-mark {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent 48%),
    linear-gradient(135deg, var(--primary), var(--primary-2) 54%, var(--accent));
  box-shadow: 0 16px 36px rgba(115, 92, 247, 0.35);
}

.brand-mark svg {
  width: 30px;
  height: 30px;
}

.hero-copy h1,
.hero-copy p,
.eyebrow,
.result-header h2,
.result-header p,
.empty-state h3,
.empty-state p {
  margin: 0;
}

.eyebrow {
  margin-bottom: 4px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 900;
}

.hero-copy h1 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: 0;
}

.hero-copy p {
  margin-top: 5px;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 10px;
}

.workspace {
  display: grid;
  grid-template-columns: 370px minmax(0, 1fr);
  flex: 1 1 auto;
  align-items: stretch;
  gap: 18px;
  min-height: 0;
}

.compose-panel,
.result-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), transparent 40%),
    var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: var(--panel-blur);
}

.compose-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 0;
  padding: 18px;
}

.field-group {
  display: grid;
  gap: 10px;
}

.field-group.grow {
  flex: 1;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
}

.group-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 900;
}

.group-title svg,
.icon-text-btn svg,
.primary-btn svg,
.quiet-btn svg {
  width: 18px;
  height: 18px;
}

.key-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  gap: 8px;
}

.text-input,
.note-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  color: var(--ink);
  background: var(--field);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.text-input::placeholder,
.note-input::placeholder {
  color: color-mix(in srgb, var(--muted) 72%, transparent);
}

.text-input {
  height: 46px;
  padding: 0 13px;
}

.note-input {
  height: 100%;
  min-height: 0;
  padding: 14px;
  resize: none;
  line-height: 1.7;
}

.text-input:focus,
.note-input:focus {
  border-color: color-mix(in srgb, var(--primary) 72%, white);
  background: var(--surface-strong);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 22%, transparent);
}

.quick-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.quick-actions button,
.quiet-btn,
.icon-text-btn,
.icon-btn,
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  gap: 8px;
  border-radius: 8px;
  font-weight: 850;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.quick-actions button {
  border: 1px solid color-mix(in srgb, var(--primary) 26%, transparent);
  color: var(--ink);
  background: color-mix(in srgb, var(--surface-strong) 78%, var(--primary) 8%);
  font-size: 0.88rem;
}

.quick-actions button:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--primary-2) 46%, transparent);
  background: color-mix(in srgb, var(--surface-strong) 72%, var(--primary-2) 12%);
}

.action-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  flex: 0 0 auto;
  gap: 10px;
}

.primary-btn {
  color: #ffffff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 46%),
    linear-gradient(135deg, var(--primary), var(--primary-2) 54%, var(--accent));
  box-shadow: 0 16px 34px color-mix(in srgb, var(--primary) 32%, transparent);
}

.primary-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 20px 42px color-mix(in srgb, var(--primary) 38%, transparent);
}

.quiet-btn,
.icon-text-btn,
.icon-btn {
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--field);
}

.quiet-btn:hover:not(:disabled),
.icon-text-btn:hover:not(:disabled),
.icon-btn:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--primary) 36%, var(--line));
  background: var(--surface-strong);
}

.quiet-btn {
  justify-self: start;
  min-height: 36px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 0.86rem;
}

.icon-text-btn {
  padding: 0 14px;
  white-space: nowrap;
}

.icon-btn {
  width: 44px;
  min-width: 44px;
  padding: 0;
}

.reset-btn {
  width: 48px;
  min-width: 48px;
  height: 48px;
}

.result-panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 18px;
}

.result-header {
  display: flex;
  flex: 0 0 auto;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.result-header h2 {
  font-size: 1.04rem;
  font-weight: 900;
}

.result-header p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.9rem;
}

.model-pill {
  flex: 0 0 auto;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
  border-radius: 999px;
  background: var(--pill-bg);
  color: var(--pill-ink);
  padding: 7px 10px;
  font-size: 0.76rem;
  font-weight: 900;
}

.chat-window {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
}

.chat-window::-webkit-scrollbar {
  width: 10px;
}

.chat-window::-webkit-scrollbar-thumb {
  border: 3px solid transparent;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 42%, transparent);
  background-clip: content-box;
}

.empty-state {
  display: grid;
  min-height: 100%;
  place-items: center;
  align-content: center;
  gap: 12px;
  border: 1px dashed color-mix(in srgb, var(--line) 80%, var(--primary));
  border-radius: 8px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, transparent), transparent 42%),
    linear-gradient(315deg, color-mix(in srgb, var(--accent) 10%, transparent), transparent 42%),
    color-mix(in srgb, var(--surface-strong) 64%, transparent);
  text-align: center;
}

.empty-icon {
  display: grid;
  width: 70px;
  height: 70px;
  place-items: center;
  border-radius: 8px;
  color: var(--primary);
  background: color-mix(in srgb, var(--surface-strong) 76%, var(--primary) 12%);
}

.empty-icon svg {
  width: 34px;
  height: 34px;
}

.empty-state h3 {
  font-size: 1.16rem;
  font-weight: 900;
}

.empty-state p {
  color: var(--muted);
}

.message {
  display: grid;
  gap: 8px;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.message-meta svg {
  width: 16px;
  height: 16px;
}

.bubble {
  border-radius: 8px;
  padding: 14px 16px;
  line-height: 1.75;
}

.message.user {
  justify-items: end;
}

.message.user .bubble {
  max-width: min(82%, 700px);
  color: var(--ink);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary) 18%, var(--surface-strong)), color-mix(in srgb, var(--accent) 14%, var(--surface-strong)));
  white-space: pre-wrap;
}

.message.assistant .bubble {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-solid);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--primary) 10%, transparent);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  margin: 0.8em 0 0.45em;
  font-size: 1.04rem;
  font-weight: 900;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  margin: 0 0 0.8em;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.25rem;
}

.markdown-body table {
  width: 100%;
  margin: 12px 0;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--line);
  padding: 9px;
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: color-mix(in srgb, var(--surface-strong) 78%, var(--primary) 10%);
}

.notice {
  margin-bottom: 12px;
  border-radius: 8px;
  padding: 12px 14px;
  font-weight: 850;
}

.error-box {
  border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger);
  background: var(--danger-bg);
}

.loading-box {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid color-mix(in srgb, var(--primary) 28%, transparent);
  color: var(--primary);
  background: color-mix(in srgb, var(--surface-strong) 78%, var(--primary) 8%);
}

.hidden {
  display: none;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 3px solid color-mix(in srgb, var(--primary) 20%, transparent);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.help-dialog {
  width: min(460px, calc(100% - 32px));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  color: var(--ink);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), transparent 40%),
    var(--surface-strong);
  box-shadow: var(--shadow);
  backdrop-filter: var(--panel-blur);
}

.help-dialog::backdrop {
  background: rgba(4, 7, 18, 0.45);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.dialog-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 900;
}

.help-list {
  display: grid;
  gap: 10px;
}

.help-list p,
.security-note {
  margin: 0;
  color: var(--ink);
  line-height: 1.65;
}

.security-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.9rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 900px) {
  .app-shell {
    width: min(100% - 20px, 720px);
    padding: 12px 0;
  }

  .hero {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .brand-mark {
    width: 54px;
    height: 54px;
  }

  .hero-actions {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(250px, 42%) minmax(0, 1fr);
  }
}

@media (min-width: 901px) {
  .compose-panel {
    align-self: start;
    height: 100%;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: calc(100% - 16px);
  }

  .hero {
    padding: 12px;
  }

  .hero-copy h1 {
    font-size: 1.62rem;
  }

  .hero-actions {
    width: 100%;
  }

  .icon-text-btn {
    flex: 1;
  }

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

  .result-header {
    flex-direction: column;
  }

  .message.user .bubble {
    max-width: 100%;
  }
}