/* ============================================================
   MaterialCalc 双语文档首页样式(原生 CSS 设计系统)
   Engineered for SEO & GEO readability (semantic, light, fast)
   ------------------------------------------------------------
   设计令牌 / Reset / 基础排版 / 无障碍 / .container
   统一由 assets/css/base.css 提供，本文件只保留组件样式。
   ============================================================ */
@import url("https://jiameiyp.com.cn/assets/css/base.css");

/* 主站正文字号(基座为浏览器默认 16px，此处按主站排版习惯放大) */
body {
  font-size: 16.5px;
}

/* ---------- 区块 ---------- */
.section {
  padding-block: clamp(56px, 8vw, 96px);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(30px, 5vw, 48px);
}

.section-head .kicker {
  color: var(--brand);
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
  margin-bottom: 10px;
}

.section-head p.lead {
  font-size: 1.1rem;
  color: var(--text-soft);
  margin-bottom: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.18rem;
  color: var(--text);
  margin-right: auto;
}

.brand:hover {
  text-decoration: none;
}

.brand .logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--brand);
  display: grid;
  place-items: center;
  color: #fff;
  flex: none;
}

.brand .logo-mark svg {
  width: 20px;
  height: 20px;
}

.main-nav {
  display: flex;
  gap: 4px;
}

.main-nav a {
  color: var(--text-soft);
  font-weight: 550;
  padding: 8px 12px;
  border-radius: 8px;
}

.main-nav a:hover {
  color: var(--brand);
  background: var(--brand-soft);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-link {
  font-weight: 650;
  border: 1px solid var(--line-strong);
  padding: 8px 14px;
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.15s, color 0.15s;
}

.lang-link:hover {
  border-color: var(--brand);
  color: var(--brand);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
}

.nav-toggle svg {
  width: 26px;
  height: 26px;
  stroke: var(--text);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 650;
  font-size: 0.98rem;
  padding: 13px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 6px 18px rgba(15, 107, 79, 0.28);
}

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

.btn-secondary {
  background: #fff;
  color: var(--text);
  border-color: var(--line-strong);
}

.btn-secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.btn-lg {
  padding: 15px 26px;
  font-size: 1.02rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(60% 90% at 88% -10%, rgba(242, 169, 59, 0.16), transparent 60%),
    radial-gradient(50% 80% at 0% 10%, rgba(15, 107, 79, 0.12), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
}

.hero-grid {
  padding-block: clamp(52px, 9vw, 104px);
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.hero-copy .kicker {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 650;
  font-size: 0.84rem;
  padding: 6px 13px;
  border-radius: 999px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-copy h1 {
  margin-bottom: 18px;
}

.hero-copy h1 .hl {
  color: var(--brand);
}

.hero-copy .direct-answer {
  font-size: 1.1rem;
  color: var(--text-soft);
  max-width: 34em;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px dashed var(--line-strong);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 550;
  color: var(--text-soft);
}

.hero-meta svg {
  width: 17px;
  height: 17px;
  stroke: var(--brand);
  flex: none;
}

/* 右侧：动态计算器视觉 */
.hero-visual {
  position: relative;
}

.hero-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 26px 24px 22px;
  transform: rotate(1.2deg);
}

.hero-card h3 {
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.hero-card h3 .badge {
  font-size: 0.72rem;
  background: var(--brand-soft);
  color: var(--brand);
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 700;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  margin-bottom: 6px;
}

.input-wrap {
  display: flex;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fff;
}

.input-wrap input {
  flex: 1;
  border: 0;
  outline: none;
  padding: 10px 13px;
  font-size: 1rem;
  font-family: inherit;
  min-width: 0;
}

.input-wrap .unit {
  background: var(--bg);
  border-left: 1px solid var(--line);
  padding: 10px 12px;
  font-size: 0.84rem;
  font-weight: 650;
  color: var(--muted);
  display: grid;
  place-items: center;
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-soft);
  border: 1.5px solid var(--line-strong);
  padding: 7px 12px;
  border-radius: 999px;
  cursor: pointer;
  background: #fff;
}

.chip.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.result-preview {
  margin-top: 16px;
  background: var(--brand-soft);
  border: 1px dashed color-mix(in srgb, var(--brand) 45%, transparent);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.result-preview .amount {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--brand-dark);
}

.result-preview .note {
  font-size: 0.84rem;
  color: var(--text-soft);
  line-height: 1.4;
}

.demo-btn {
  width: 100%;
  margin-top: 14px;
}

.hero-card .disclaimer {
  margin: 12px 0 0;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.floating-note {
  position: absolute;
  bottom: -14px;
  left: -14px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.82rem;
  font-weight: 650;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  gap: 8px;
}

.floating-note svg {
  width: 18px;
  height: 18px;
  stroke: var(--accent-dark);
}

/* ---------- 徽章栏 (stats strip) ---------- */
.stats-strip {
  background: var(--brand-deep);
  color: #fff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-block: 30px;
}

.stat {
  text-align: center;
  padding-inline: 8px;
}

.stat .num {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--accent);
}

.stat .lbl {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.78);
  margin-top: 2px;
}

/* ---------- 工具网格 ---------- */
.tools-section {
  background: var(--bg);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--line-strong);
}

.tool-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.tool-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: var(--brand-soft);
  display: grid;
  place-items: center;
  color: var(--brand);
}

.tool-icon svg {
  width: 24px;
  height: 24px;
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--accent);
  color: #3b2a05;
  padding: 3px 9px;
  border-radius: 999px;
}

.tool-card h3 {
  font-size: 1.08rem;
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 0.93rem;
  color: var(--text-soft);
  flex: 1;
  margin-bottom: 18px;
}

.tool-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-weight: 700;
  font-size: 0.93rem;
  color: var(--brand);
}

.tool-cta svg {
  width: 16px;
  height: 16px;
  transition: transform 0.15s;
}

.tool-card:hover .tool-cta svg {
  transform: translateX(3px);
}

.tool-card a.stretched {
  position: static;
}

/* ---------- How it works ---------- */
.how-section {
  background: #fff;
  border-block: 1px solid var(--line);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 30px);
}

.step {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px 24px;
}

.step-num {
  position: absolute;
  top: -18px;
  left: 22px;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  box-shadow: 0 6px 14px rgba(15, 107, 79, 0.3);
}

.step h3 {
  margin-top: 10px;
}

.step p {
  font-size: 0.95rem;
  color: var(--text-soft);
  margin-bottom: 0;
}

/* ---------- 数据可信区 ---------- */
.trust-section {
  background: var(--bg);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 26px;
}

.trust-item {
  display: flex;
  gap: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.trust-item svg {
  width: 24px;
  height: 24px;
  flex: none;
  color: var(--brand);
  margin-top: 2px;
}

.trust-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.trust-item p {
  font-size: 0.92rem;
  color: var(--text-soft);
  margin-bottom: 0;
}

/* ---------- FAQ ---------- */
.faq-section {
  background: #fff;
  border-top: 1px solid var(--line);
}

.faq-list {
  max-width: 820px;
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 650;
  font-size: 1.02rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary .faq-arrow {
  width: 20px;
  height: 20px;
  flex: none;
  color: var(--brand);
  transition: transform 0.18s;
}

.faq-item[open] summary .faq-arrow {
  transform: rotate(180deg);
}

.faq-item .faq-body {
  padding: 0 22px 20px;
  color: var(--text-soft);
}

.faq-item .faq-body p {
  margin-bottom: 0;
  font-size: 0.97rem;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--brand-dark), var(--brand));
  color: #fff;
  text-align: center;
}

.cta-inner {
  padding-block: clamp(48px, 7vw, 76px);
}

.cta-inner h2 {
  color: #fff;
  margin-bottom: 10px;
}

.cta-inner p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 28px;
}

.btn-light {
  background: #fff;
  color: var(--brand-dark);
}

.btn-light:hover {
  background: var(--accent);
  color: #3b2a05;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--brand-deep);
  color: rgba(255, 255, 255, 0.82);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-block: 52px 40px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #fff;
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.footer-brand:hover {
  text-decoration: none;
}

.footer-desc {
  font-size: 0.92rem;
  max-width: 32em;
}

.footer h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.93rem;
}

.footer a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-block: 20px;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    max-width: 460px;
  }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px var(--gutter) 20px;
    box-shadow: var(--shadow);
    display: none;
  }
  .main-nav.open {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 24px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }
  .tool-grid,
  .steps,
  .trust-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .floating-note {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ---------- 工具箱首页 (Toolbox) ---------- */
.hub-feature {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: clamp(24px, 4vw, 42px);
}

.hub-feature h3 {
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  margin-bottom: 10px;
}

.hub-feature p {
  color: var(--text-soft);
}

.hub-logo {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--brand-soft);
  color: var(--brand);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
}

.hub-logo svg {
  width: 32px;
  height: 32px;
}

.hub-logo.fun {
  background: #fdeef3;
  color: #d6336c;
}

.hub-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 22px;
}

.hub-tags span {
  font-size: 0.8rem;
  font-weight: 650;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border-radius: 999px;
  padding: 5px 12px;
}

.hub-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 18px;
}

.hub-links.single {
  grid-template-columns: 1fr;
}

.hub-links a {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.93rem;
  font-weight: 550;
  color: var(--text-soft);
}

.hub-links a:hover {
  color: var(--brand);
  text-decoration: none;
}

.hub-links a::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (max-width: 860px) {
  .hub-feature {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hub-links,
  .hub-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 法律 / 文档页 (Privacy, About, Terms ...) ---------- */
.doc-wrap {
  max-width: 860px;
}

.doc-wrap h2 {
  margin-top: 1.9em;
  padding-top: 0.2em;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
}

.doc-wrap h3 {
  margin-top: 1.4em;
}

.doc-wrap ul,
.doc-wrap ol {
  padding-left: 1.35em;
  margin: 0 0 1.1em;
}

.doc-wrap li {
  margin-bottom: 0.5em;
  color: var(--text-soft);
}

.doc-wrap p,
.doc-wrap li {
  font-size: 0.98rem;
}

.doc-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.8em;
}

.doc-lead {
  font-size: 1.08rem;
  color: var(--text-soft);
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin-bottom: 1.6em;
}

.doc-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.doc-nav a {
  border: 1px solid var(--line-strong);
  background: #fff;
  border-radius: 999px;
  padding: 8px 15px;
  font-weight: 600;
  font-size: 0.9rem;
}

.doc-nav a:hover {
  border-color: var(--brand);
  color: var(--brand);
  text-decoration: none;
}

.doc-contact {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 1.2em 0;
  box-shadow: var(--shadow-sm);
}

.doc-contact p:last-child {
  margin-bottom: 0;
}