:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --ink: #211f1c;
  --muted: #6f6a62;
  --line: #ded8cf;
  --accent: #1f6f63;
  --accent-strong: #17564d;
  --warm: #a6543b;
  --focus: #d79b32;
  --code-bg: #fffdf9;
  --chat-self: #eef7f3;
  --chat-other: #fffdf9;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(31, 111, 99, 0.08), rgba(255, 255, 255, 0) 18rem),
    var(--paper);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    SimSun,
    serif;
  line-height: 1.7;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
  letter-spacing: 0;
}

.shell {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2.5rem);
}

.gallery {
  padding: clamp(2.5rem, 8vh, 5rem) 0 4rem;
}

.gallery-header {
  max-width: 43rem;
  margin: 0 auto clamp(1.5rem, 5vw, 2.5rem);
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.gallery-header h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.18;
}

.article-list {
  display: grid;
  gap: 0.75rem;
  max-width: 43rem;
  margin: 0 auto;
}

.article-button {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  min-height: 3.75rem;
  width: 100%;
  padding: 0.95rem 1rem;
  color: var(--ink);
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(47, 40, 32, 0.08);
}

.article-button:hover {
  border-color: var(--accent);
}

.article-button::after {
  content: ">";
  color: var(--accent);
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-weight: 700;
}

.article-cover {
  width: 4.4rem;
  height: 3.1rem;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--line);
}

.article-title {
  min-width: 0;
  overflow-wrap: anywhere;
}

.empty-state {
  margin: 0;
  color: var(--muted);
}

.unlock-panel {
  width: min(100%, 32rem);
  margin: clamp(3rem, 12vh, 7rem) auto 0;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 42px rgba(47, 40, 32, 0.12);
}

.brand,
.reader-state {
  margin: 0 0 0.45rem;
  color: var(--warm);
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
}

.unlock-panel h1,
.reader-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  line-height: 1.25;
}

.unlock-form {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.unlock-form label {
  color: var(--muted);
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-size: 0.95rem;
}

.key-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf9;
  overflow: hidden;
}

.key-field:focus-within {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(215, 155, 50, 0.2);
}

.key-field input {
  width: 100%;
  min-width: 0;
  padding: 0.65rem 0.85rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-left: 1px solid var(--line);
  cursor: pointer;
}

.icon-button:hover {
  color: var(--accent);
  background: rgba(31, 111, 99, 0.08);
}

.icon-button svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.primary-button,
.secondary-button {
  min-height: 2.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-weight: 700;
}

.primary-button {
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
}

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

.primary-button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.secondary-button {
  padding: 0 1rem;
  color: var(--accent-strong);
  background: #fffdf9;
  border: 1px solid var(--line);
}

.secondary-button:hover {
  border-color: var(--accent);
}

.text-button {
  display: block;
  min-height: 2.5rem;
  margin: 0.65rem auto 0;
  padding: 0 0.35rem;
  color: var(--accent-strong);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-weight: 700;
}

.text-button:hover {
  color: var(--warm);
}

.status {
  min-height: 1.5rem;
  margin: 0;
  color: var(--muted);
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-size: 0.92rem;
}

.status.error {
  color: #9f3028;
}

.reader {
  padding: clamp(1rem, 3vw, 2.25rem) 0 4rem;
}

.reader-cover {
  max-width: 52rem;
  margin: 0 auto clamp(1.25rem, 4vw, 2rem);
}

.reader-cover img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 34px rgba(47, 40, 32, 0.14);
}

.reader-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.4rem);
  border-bottom: 1px solid var(--line);
}

.content {
  font-size: clamp(1.03rem, 1.4vw, 1.15rem);
}

.content > * {
  max-width: 43rem;
  margin-right: auto;
  margin-left: auto;
}

.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  margin-top: 2.3em;
  margin-bottom: 0.8em;
  line-height: 1.35;
}

.content h1 {
  font-size: clamp(1.9rem, 6vw, 3rem);
  text-align: center;
}

.content h2 {
  font-size: clamp(1.45rem, 4vw, 2rem);
  color: var(--accent-strong);
}

.content h3 {
  font-size: 1.25rem;
}

.content p {
  margin-top: 0;
  margin-bottom: 1.05em;
  text-align: justify;
  text-wrap: pretty;
}

.content .code-block {
  max-width: min(100%, 52rem);
  padding: 1rem;
  overflow-x: hidden;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--ink);
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.content code {
  font-family:
    "Cascadia Code",
    Consolas,
    "Microsoft YaHei UI",
    monospace;
  font-size: 0.92em;
}

.chat-transcript {
  display: grid;
  gap: 0.7rem;
  max-width: 46rem;
  margin: 1.35rem auto;
}

.chat-message {
  width: min(100%, 34rem);
  padding: 0.85rem 0.95rem;
  background: var(--chat-other);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 18px rgba(47, 40, 32, 0.06);
}

.chat-message-self {
  justify-self: end;
  background: var(--chat-self);
  border-color: rgba(31, 111, 99, 0.24);
}

.chat-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  margin-bottom: 0.35rem;
  font-family:
    Inter,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  line-height: 1.35;
}

.chat-meta strong {
  color: var(--accent-strong);
  font-size: 0.92rem;
}

.chat-meta time {
  color: var(--muted);
  font-size: 0.78rem;
}

.chat-body {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  line-height: 1.65;
}

.content :not(pre) > code {
  padding: 0.1rem 0.28rem;
  color: var(--warm);
  background: rgba(166, 84, 59, 0.08);
  border-radius: 4px;
}

.content blockquote {
  padding-left: 1rem;
  color: var(--muted);
  border-left: 3px solid var(--warm);
}

.content ul,
.content ol {
  padding-left: 1.4rem;
}

.content hr {
  height: 1px;
  margin: 2rem auto;
  background: var(--line);
  border: 0;
}

@media (max-width: 620px) {
  .shell {
    padding: 0.85rem;
  }

  .unlock-panel {
    margin-top: 2rem;
  }

  .reader-header {
    display: grid;
  }

  .secondary-button {
    width: 100%;
  }

  .article-button {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .article-cover {
    grid-column: 1 / -1;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .content p {
    text-align: left;
  }
}