/* ================================================================
   style.css — 全局样式
   Token 由 color.css 提供
   分三层：① Reset & 基础  ② 组件  ③ 工具类
   ================================================================ */

/* ----------------------------------------------------------------
   ① Reset & 基础
   ---------------------------------------------------------------- */
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: var(--font-sans);
  color: var(--fg-default);
  background: var(--gray-25);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "tnum" 1;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ----------------------------------------------------------------
   ② 组件
   ---------------------------------------------------------------- */

/* -- Buttons -- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 40px; padding: 0 18px;
  border-radius: var(--radius-md);
  font-size: var(--text-md); font-weight: 500;
  border: 1px solid transparent;
  transition: background var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
  white-space: nowrap;
}
.btn-primary   { background: var(--brand-500); color: #fff; }
.btn-primary:hover  { background: var(--brand-600); }
.btn-primary:active { background: var(--brand-700); }
.btn-secondary { background: var(--gray-0); color: var(--brand-900); border-color: var(--border-default); }
.btn-secondary:hover { background: var(--gray-50); border-color: var(--border-strong); }
.btn-ghost  { background: transparent; color: var(--fg-default); }
.btn-ghost:hover { background: var(--gray-100); }
.btn-lg { height: 48px; padding: 0 24px; font-size: var(--text-lg); }
.btn .icon { width: 18px; height: 18px; }

/* -- Layout helpers -- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
.section       { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.eyebrow {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: 0.12em; color: var(--brand-500);
  text-transform: uppercase; margin: 0 0 12px;
}
.section-title {
  font-size: var(--text-4xl); font-weight: 600;
  line-height: 1.18; letter-spacing: var(--tracking-cn-display);
  color: var(--brand-900); margin: 0 0 16px; max-width: 720px;
}
.section-sub {
  font-size: var(--text-lg); line-height: 1.6;
  color: var(--fg-muted); margin: 0; max-width: 640px;
}

/* -- Top Nav -- */
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}
.topnav-inner {
  height: 64px; display: flex; align-items: center; justify-content: space-between;
  max-width: 1440px; margin: 0 auto; padding: 0 32px;
}
.topnav-brand { display: flex; align-items: center; gap: 10px; }
.topnav-brand img { height: 32px; }
.topnav-links {
  display: flex; align-items: center; gap: 4px;
  font-size: var(--text-md); color: var(--gray-700);
}
.topnav-links a {
  padding: 8px 14px; border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-standard);
}
.topnav-links a:hover { background: var(--gray-100); color: var(--brand-900); }
.topnav-cta { display: flex; gap: 10px; align-items: center; }

/* Nav user dropdown */
.nav-user { position: relative; }
.nav-user-btn {
  display: flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 12px;
  background: var(--gray-0); border: 1px solid var(--border-default);
  border-radius: var(--radius-pill); cursor: pointer;
  font-size: var(--text-md); color: var(--gray-800); font-weight: 500;
  transition: border-color var(--duration-fast) var(--ease-standard);
}
.nav-user-btn:hover { border-color: var(--border-strong); }
.nav-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--brand-500); color: #fff;
  display: grid; place-items: center;
  font-size: 10px; font-weight: 700; flex-shrink: 0;
}
.nav-user-btn .icon { width: 14px; height: 14px; color: var(--fg-muted); }
.nav-dropdown {
  display: none; position: absolute; top: calc(100% + 8px); right: 0;
  min-width: 160px; background: var(--gray-0);
  border: 1px solid var(--border-default); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; z-index: 100;
}
.nav-dropdown.open { display: block; }
.nav-dropdown a, .nav-dropdown button {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 10px 14px;
  font-size: var(--text-sm); color: var(--gray-800);
  background: none; border: none; cursor: pointer;
  text-decoration: none; font-family: inherit;
  transition: background var(--duration-fast) var(--ease-standard);
}
.nav-dropdown a:hover, .nav-dropdown button:hover { background: var(--gray-50); }
.nav-dropdown .icon { width: 14px; height: 14px; color: var(--fg-muted); }
.nav-dropdown-divider { height: 1px; background: var(--border-subtle); margin: 4px 0; }
.nav-dropdown .logout { color: var(--danger-600); }

/* Hamburger button (hidden on desktop) */
.nav-hamburger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; padding: 8px;
  background: none; border: none; cursor: pointer;
  border-radius: var(--radius-md);
}
.nav-hamburger span {
  display: block; height: 2px; width: 22px;
  background: var(--gray-700); border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* Mobile menu (hidden by default) */
.nav-mobile-menu {
  display: none; flex-direction: column;
  background: var(--gray-0);
  border-top: 1px solid var(--border-subtle);
  padding: 8px 0 16px;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu a {
  padding: 12px 24px; font-size: var(--text-md);
  color: var(--gray-700); font-weight: 500;
  transition: background var(--duration-fast) var(--ease-standard);
}
.nav-mobile-menu a:hover { background: var(--gray-50); color: var(--brand-900); }
.nav-mobile-cta {
  display: flex; flex-direction: column; gap: 8px;
  padding: 12px 24px 0;
  border-top: 1px solid var(--border-subtle);
  margin-top: 8px;
}
.nav-mobile-cta .btn { justify-content: center; }

/* -- Footer -- */
footer {
  background: var(--gray-25);
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 40px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 48px; margin-bottom: 48px;
}
.footer-brand img { height: 32px; margin-bottom: 16px; }
.footer-brand p { margin: 0 0 16px; max-width: 320px; line-height: 1.6; color: var(--fg-muted); }
.footer-contact { font-size: var(--text-sm); color: var(--gray-700); line-height: 1.8; }
.footer-col h5 {
  font-size: var(--text-xs); font-weight: 600;
  color: var(--brand-900); letter-spacing: 0.06em;
  margin: 0 0 16px; text-transform: uppercase;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col li a { color: var(--gray-600); }
.footer-col li a:hover { color: var(--brand-500); }
.footer-bottom {
  border-top: 1px solid var(--border-subtle); padding-top: 24px;
  display: flex; justify-content: space-between;
  font-size: var(--text-xs); color: var(--fg-subtle);
}

/* ----------------------------------------------------------------
   ③ 工具类
   命名规则：{属性}-{值}
   间距值直接对应像素：p-8 = padding:8px，gap-16 = gap:16px
   ---------------------------------------------------------------- */

/* -- Display -- */
.d-flex        { display: flex }
.d-inline-flex { display: inline-flex }
.d-grid        { display: grid }
.d-block       { display: block }
.d-inline      { display: inline }
.d-inline-block{ display: inline-block }
.d-none        { display: none }
.place-center  { display: grid; place-items: center } /* 图标容器常用 */

/* -- Flex -- */
.flex-col      { flex-direction: column }
.flex-wrap     { flex-wrap: wrap }
.flex-1        { flex: 1 }
.flex-shrink-0 { flex-shrink: 0 }
.items-center   { align-items: center }
.items-start    { align-items: flex-start }
.items-end      { align-items: flex-end }
.items-baseline { align-items: baseline }
.justify-center  { justify-content: center }
.justify-between { justify-content: space-between }
.justify-end     { justify-content: flex-end }
.justify-start   { justify-content: flex-start }

/* -- Grid 列模板 -- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr) }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr) }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr) }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr) }

/* -- Gap -- */
.gap-2  { gap: 2px }
.gap-4  { gap: 4px }
.gap-6  { gap: 6px }
.gap-8  { gap: 8px }
.gap-10 { gap: 10px }
.gap-12 { gap: 12px }
.gap-14 { gap: 14px }
.gap-16 { gap: 16px }
.gap-18 { gap: 18px }
.gap-24 { gap: 24px }
.gap-32 { gap: 32px }
.gap-48 { gap: 48px }
.gap-64 { gap: 64px }

/* -- Padding（全方向） -- */
.p-0  { padding: 0 }
.p-4  { padding: 4px }
.p-6  { padding: 6px }
.p-8  { padding: 8px }
.p-10 { padding: 10px }
.p-12 { padding: 12px }
.p-14 { padding: 14px }
.p-16 { padding: 16px }
.p-18 { padding: 18px }
.p-20 { padding: 20px }
.p-24 { padding: 24px }
.p-28 { padding: 28px }
.p-32 { padding: 32px }
.p-48 { padding: 48px }
.p-56 { padding: 56px }
.p-64 { padding: 64px }

/* px / py */
.px-4  { padding-left: 4px;  padding-right: 4px  }
.px-6  { padding-left: 6px;  padding-right: 6px  }
.px-8  { padding-left: 8px;  padding-right: 8px  }
.px-10 { padding-left: 10px; padding-right: 10px }
.px-12 { padding-left: 12px; padding-right: 12px }
.px-14 { padding-left: 14px; padding-right: 14px }
.px-16 { padding-left: 16px; padding-right: 16px }
.px-20 { padding-left: 20px; padding-right: 20px }
.px-24 { padding-left: 24px; padding-right: 24px }
.px-28 { padding-left: 28px; padding-right: 28px }
.px-32 { padding-left: 32px; padding-right: 32px }

.py-2  { padding-top: 2px;  padding-bottom: 2px  }
.py-4  { padding-top: 4px;  padding-bottom: 4px  }
.py-6  { padding-top: 6px;  padding-bottom: 6px  }
.py-8  { padding-top: 8px;  padding-bottom: 8px  }
.py-10 { padding-top: 10px; padding-bottom: 10px }
.py-12 { padding-top: 12px; padding-bottom: 12px }
.py-14 { padding-top: 14px; padding-bottom: 14px }
.py-16 { padding-top: 16px; padding-bottom: 16px }
.py-20 { padding-top: 20px; padding-bottom: 20px }
.py-24 { padding-top: 24px; padding-bottom: 24px }
.py-32 { padding-top: 32px; padding-bottom: 32px }

/* pt / pb / pl / pr */
.pt-4  { padding-top: 4px  }  .pb-4  { padding-bottom: 4px  }
.pt-6  { padding-top: 6px  }  .pb-6  { padding-bottom: 6px  }
.pt-8  { padding-top: 8px  }  .pb-8  { padding-bottom: 8px  }
.pt-12 { padding-top: 12px }  .pb-12 { padding-bottom: 12px }
.pt-14 { padding-top: 14px }  .pb-14 { padding-bottom: 14px }
.pt-16 { padding-top: 16px }  .pb-16 { padding-bottom: 16px }
.pt-24 { padding-top: 24px }  .pb-24 { padding-bottom: 24px }
.pt-32 { padding-top: 32px }  .pb-32 { padding-bottom: 32px }
.pl-12 { padding-left: 12px } .pr-12 { padding-right: 12px }
.pl-16 { padding-left: 16px } .pr-16 { padding-right: 16px }
.pl-24 { padding-left: 24px } .pr-24 { padding-right: 24px }

/* -- Margin -- */
.m-0  { margin: 0 }
.mx-auto { margin-left: auto; margin-right: auto }

.mb-0  { margin-bottom: 0  }
.mb-2  { margin-bottom: 2px  }
.mb-4  { margin-bottom: 4px  }
.mb-6  { margin-bottom: 6px  }
.mb-8  { margin-bottom: 8px  }
.mb-10 { margin-bottom: 10px }
.mb-12 { margin-bottom: 12px }
.mb-14 { margin-bottom: 14px }
.mb-16 { margin-bottom: 16px }
.mb-18 { margin-bottom: 18px }
.mb-24 { margin-bottom: 24px }
.mb-32 { margin-bottom: 32px }
.mb-48 { margin-bottom: 48px }

.mt-2  { margin-top: 2px  }
.mt-4  { margin-top: 4px  }
.mt-6  { margin-top: 6px  }
.mt-8  { margin-top: 8px  }
.mt-12 { margin-top: 12px }
.mt-16 { margin-top: 16px }
.mt-24 { margin-top: 24px }
.mt-32 { margin-top: 32px }
.mt-48 { margin-top: 48px }

.ml-4  { margin-left: 4px  }
.ml-8  { margin-left: 8px  }
.mr-4  { margin-right: 4px }
.mr-8  { margin-right: 8px }

/* -- Font size（复用 token） -- */
.fs-xs  { font-size: var(--text-xs) }
.fs-sm  { font-size: var(--text-sm) }
.fs-md  { font-size: var(--text-md) }
.fs-lg  { font-size: var(--text-lg) }
.fs-xl  { font-size: var(--text-xl) }
.fs-2xl { font-size: var(--text-2xl) }
.fs-3xl { font-size: var(--text-3xl) }
.fs-4xl { font-size: var(--text-4xl) }

/* -- Font weight -- */
.fw-4 { font-weight: 400 }
.fw-5 { font-weight: 500 }
.fw-6 { font-weight: 600 }
.fw-7 { font-weight: 700 }

/* -- Line height -- */
.lh-1  { line-height: 1 }
.lh-12 { line-height: 1.2 }
.lh-14 { line-height: 1.4 }
.lh-15 { line-height: 1.5 }
.lh-16 { line-height: 1.6 }
.lh-17 { line-height: 1.7 }
.lh-18 { line-height: 1.8 }

/* -- Letter spacing -- */
.ls-1    { letter-spacing: 0.04em }
.ls-2    { letter-spacing: 0.06em }
.ls-3    { letter-spacing: 0.10em }
.ls-4    { letter-spacing: 0.12em }
.ls-disp { letter-spacing: var(--tracking-cn-display) }

/* -- Text color -- */
.text-brand    { color: var(--brand-500) }
.text-brand-hi { color: var(--brand-700) }
.text-brand-900{ color: var(--brand-900) }
.text-default  { color: var(--fg-default) }
.text-muted    { color: var(--fg-muted) }
.text-subtle   { color: var(--fg-subtle) }
.text-gray-6   { color: var(--gray-600) }
.text-gray-7   { color: var(--gray-700) }
.text-gray-8   { color: var(--gray-800) }
.text-gray-9   { color: var(--gray-900) }
.text-white    { color: #fff }
.text-success  { color: var(--success-700) }
.text-warning  { color: var(--warning-700) }
.text-danger   { color: var(--danger-700) }
.text-info     { color: var(--info-700) }

/* -- Background -- */
.bg-0        { background: var(--gray-0) }
.bg-25       { background: var(--gray-25) }
.bg-50       { background: var(--gray-50) }
.bg-100      { background: var(--gray-100) }
.bg-brand    { background: var(--brand-500) }
.bg-brand-50 { background: var(--brand-50) }
.bg-brand-900{ background: var(--brand-900) }
.bg-success-50 { background: var(--success-50) }
.bg-warning-50 { background: var(--warning-50) }
.bg-danger-50  { background: var(--danger-50) }
.bg-info-50    { background: var(--info-50) }

/* -- Border -- */
.border         { border: 1px solid var(--border-default) }
.border-top     { border-top: 1px solid var(--border-default) }
.border-bottom  { border-bottom: 1px solid var(--border-default) }
.border-left    { border-left: 1px solid var(--border-default) }
.border-subtle  { border-color: var(--border-subtle) }
.border-strong  { border-color: var(--border-strong) }
.border-brand   { border-color: var(--brand-500) }
.border-0       { border: none }

/* -- Border radius -- */
.rounded-sm   { border-radius: var(--radius-sm) }
.rounded-md   { border-radius: var(--radius-md) }
.rounded-lg   { border-radius: var(--radius-lg) }
.rounded-xl   { border-radius: var(--radius-xl) }
.rounded-pill { border-radius: var(--radius-pill) }
.rounded-full { border-radius: 50% }

/* -- Shadow -- */
.shadow-sm { box-shadow: var(--shadow-sm) }
.shadow-md { box-shadow: var(--shadow-md) }
.shadow-lg { box-shadow: var(--shadow-lg) }
.shadow-xl { box-shadow: var(--shadow-xl) }

/* -- Text helpers -- */
.text-upper  { text-transform: uppercase }
.text-center { text-align: center }
.text-right  { text-align: right }
.text-nowrap { white-space: nowrap }
.font-mono   { font-family: var(--font-mono) }
.tabular     { font-variant-numeric: tabular-nums }

/* -- Sizing & position -- */
.w-full  { width: 100% }
.h-full  { height: 100% }
.min-w-0 { min-width: 0 }
.pos-relative { position: relative }
.pos-absolute { position: absolute }
.pos-sticky   { position: sticky }
.overflow-hidden  { overflow: hidden }
.overflow-x-auto  { overflow-x: auto }

/* -- Transition（常用属性组合） -- */
.transition {
  transition: background var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard);
}

/* ----------------------------------------------------------------
   Card & Badge 高频组合
   ---------------------------------------------------------------- */

/* card：bg-0 + border + rounded-lg，三个页面共用 15+ 次 */
.card {
  background: var(--gray-0);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}

/* badge：状态标签小胶囊 */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
}
.badge-brand   { background: var(--brand-50);   color: var(--brand-700) }
.badge-success { background: var(--success-50); color: var(--success-700) }
.badge-warning { background: var(--warning-50); color: var(--warning-700) }
.badge-danger  { background: var(--danger-50);  color: var(--danger-700) }
.badge-info    { background: var(--info-50);    color: var(--info-700) }
.badge-gray    { background: var(--gray-100);   color: var(--gray-700) }
.badge-solid   { background: var(--brand-500);  color: #fff }

/* icon 尺寸 */
.icon-sm  { width: 14px; height: 14px }
.icon-md  { width: 18px; height: 18px }
.icon-lg  { width: 22px; height: 22px }
.icon-xl  { width: 28px; height: 28px }
.icon-2xl { width: 36px; height: 36px }

/* icon-box：方形图标容器（带背景色时使用） */
.icon-box-sm { width: 28px; height: 28px; border-radius: var(--radius-sm);  display: grid; place-items: center }
.icon-box-md { width: 36px; height: 36px; border-radius: 8px;               display: grid; place-items: center }
.icon-box-lg { width: 40px; height: 40px; border-radius: 10px;              display: grid; place-items: center }
.icon-box-xl { width: 56px; height: 56px; border-radius: var(--radius-md);  display: grid; place-items: center }

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .container   { padding: 0 20px; }
}
@media (max-width: 768px) {
  .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  /* Show hamburger, hide desktop nav links */
  .nav-hamburger { display: flex; }
  .topnav-links, .topnav-cta { display: none; }
}
@media (max-width: 600px) {
  .topnav-inner { padding: 0 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
  .section { padding-top: 48px; padding-bottom: 48px; }
  h1, .h1 { font-size: clamp(1.75rem, 7vw, 2.5rem); }
  h2, .h2 { font-size: clamp(1.375rem, 5vw, 2rem); }
}