/* ABOUTME: 扣子智能搜索网 · 编辑部阅读室风格样式 */
/* ABOUTME: 米白纸感底、墨黑正文、深墨绿点睛；两栏报刊布局 */

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

:root {
  /* 纸与墨 */
  --paper: #f5f1ea;
  --paper-2: #ede7da;
  --paper-3: #e6dfce;
  --ink: #1c1b18;
  --ink-2: #4a4740;
  --ink-3: #7a756a;
  --rule: #d6cfbe;
  --rule-strong: #b9b09a;

  /* 强调色 */
  --accent: #2b4c3f;
  --accent-hover: #234035;
  --accent-ink: #f5f1ea;
  --brass: #a67c4a;

  /* 字体 */
  --font-serif-cn: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    system-ui, sans-serif;
  --font-serif-en: "Fraunces", Georgia, serif;
  --font-sans-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;

  /* 尺度 */
  --gutter: 1px;
  --pad-x: clamp(20px, 3.2vw, 40px);
  --pad-y: clamp(18px, 2.4vw, 28px);
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-sans-en), var(--font-sans-cn);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  /* 极轻的纸纹底噪：由极稀疏的点阵模拟 */
  background-image: radial-gradient(
    rgba(28, 27, 24, 0.035) 1px,
    transparent 1px
  );
  background-size: 3px 3px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  animation: paper-fade-in 300ms ease-out both;
}

@keyframes paper-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========== 报头 Masthead ========== */
.masthead {
  border-bottom: 1px solid var(--ink);
  padding: clamp(18px, 2.4vw, 28px) var(--pad-x) clamp(14px, 2vw, 20px);
  background: var(--paper);
  position: relative;
}
.masthead::after {
  /* 报纸典型的"双线"刊头分隔 */
  content: "";
  position: absolute;
  left: var(--pad-x);
  right: var(--pad-x);
  bottom: -4px;
  height: 1px;
  background: var(--ink);
}

.masthead-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.masthead-left {
  min-width: 260px;
}

.masthead-title {
  font-family: var(--font-serif-en), var(--font-serif-cn);
  font-weight: 900;
  color: var(--ink);
  line-height: 0.95;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin: 6px 0 8px;
}
.masthead-title .zh {
  font-family: var(--font-serif-cn);
  font-size: clamp(28px, 4.4vw, 48px);
}
.masthead-title .en {
  font-family: var(--font-serif-en);
  font-size: clamp(14px, 1.4vw, 18px);
  font-style: italic;
  font-weight: 500;
  color: var(--ink-2);
  letter-spacing: 0;
}

.masthead-sub {
  font-family: var(--font-sans-cn);
  color: var(--ink-2);
  font-size: 13.5px;
  max-width: 62ch;
}

.eyebrow {
  font-family: var(--font-sans-en);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}

/* SDK 输入区 */
.masthead-right {
  flex: 0 1 auto;
  min-width: 300px;
  max-width: 460px;
}
.sdk-row {
  margin-top: 6px;
  display: flex;
  gap: 8px;
  align-items: stretch;
}
#sdkUrl {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans-en), var(--font-sans-cn);
  font-size: 13px;
  outline: none;
  transition: border-color 200ms cubic-bezier(0.2, 0.7, 0.2, 1),
    background 200ms;
}
#sdkUrl:focus {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  background: #fbf8f2;
}
#sdkUrl::placeholder {
  color: var(--ink-3);
}

.btn-primary,
.btn-secondary {
  height: 36px;
  padding: 0 14px;
  font-family: var(--font-sans-cn);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 180ms cubic-bezier(0.2, 0.7, 0.2, 1),
    color 180ms, border-color 180ms;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-secondary {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--ink);
}
.btn-secondary:hover {
  background: var(--paper-2);
}

.hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--ink-3);
  font-family: var(--font-sans-cn);
}
.hint[data-state="ok"] {
  color: var(--accent);
}
.hint[data-state="err"] {
  color: #8a3b2a;
}

/* ========== 主舞台 ========== */
.stage {
  flex: 1;
  display: grid;
  grid-template-columns: 60% var(--gutter) 40%;
  min-height: 0;
}

.column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: clamp(20px, 2.6vw, 32px) var(--pad-x) clamp(20px, 2vw, 28px);
}
.column-left {
  background: var(--paper);
}
.column-right {
  background: var(--paper-2);
}

.gutter {
  background: var(--ink);
  opacity: 0.75;
}

.column-head {
  margin-bottom: 16px;
}
.column-title {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  font-size: clamp(22px, 2.4vw, 28px);
  color: var(--ink);
  margin: 4px 0 6px;
  letter-spacing: 0.01em;
}
.column-lede {
  font-family: var(--font-sans-cn);
  color: var(--ink-2);
  font-size: 13.5px;
  max-width: 60ch;
}

/* iframe 容器 */
.frame-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  overflow: hidden;
}
.frame-wrap::before {
  /* 内框极细纸色描边，营造"贴在版面上"的感觉 */
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid var(--rule);
  pointer-events: none;
  z-index: 1;
}

.workflow-frame,
.chat-frame {
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
  display: block;
  position: relative;
  z-index: 0;
}

/* 智能体占位卡 */
.chat-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
  padding: clamp(24px, 4vw, 48px);
  background: var(--paper);
  color: var(--ink);
  z-index: 2;
}
.chat-placeholder h3 {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  font-size: clamp(22px, 2.2vw, 26px);
  letter-spacing: 0.01em;
}
.chat-placeholder p {
  font-family: var(--font-sans-cn);
  color: var(--ink-2);
  max-width: 42ch;
  font-size: 14px;
}
.chat-placeholder .footnote {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--rule);
  color: var(--ink-3);
  font-size: 12.5px;
}

/* ========== 页脚 ========== */
.colophon {
  border-top: 1px solid var(--rule-strong);
  padding: 14px var(--pad-x);
  background: var(--paper);
  color: var(--ink-3);
  font-family: var(--font-sans-cn);
  font-size: 12px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.colophon .sep {
  color: var(--rule-strong);
}

/* 链接：黄铜色下划线的报刊味道 */
a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms cubic-bezier(0.2, 0.7, 0.2, 1),
    color 200ms;
}
a:hover {
  border-bottom-color: var(--brass);
  color: var(--brass);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .stage {
    grid-template-columns: 1fr;
    grid-template-rows: 50vh var(--gutter) 50vh;
  }
  .gutter {
    height: 1px;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .stage {
    grid-template-rows: 55vh var(--gutter) 65vh;
  }
  .masthead-inner {
    flex-direction: column;
    align-items: stretch;
  }
  .masthead-right {
    max-width: 100%;
  }
  .masthead-title {
    gap: 8px;
  }
  .column {
    padding: 20px 18px;
  }
}