/* =============================================================================
 *  layout.css  ——  顶栏 + 侧栏 + 主区 + 页脚（Bento 网格整体框架）
 * ============================================================================= */

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

/* ========== 顶栏 ========== */
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: var(--topbar-h);
  padding: 0 var(--grid-margin);
  background: color-mix(in srgb, var(--color-card) 88%, transparent);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; gap: var(--space-4);
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  background: var(--color-primary);
  display: grid; place-items: center;
  box-shadow: 0 2px 8px rgba(255,122,0,.35);
}
.brand-mark .material-symbols-outlined { color: #fff; font-size: 22px; }
.brand-name {
  font-family: var(--font-num);
  font-size: var(--fs-h3); font-weight: var(--fw-h3);
  color: var(--color-text);
}

/* 顶栏页签（桌面端） */
.nav {
  display: none;
  gap: 4px;
  margin-left: 8px;
  flex: 1;
}
.nav a {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-label); font-weight: var(--fw-label);
  color: var(--color-text-2);
  transition: background-color .15s ease, color .15s ease;
  white-space: nowrap;
}
.nav a:hover { color: var(--color-text); background: var(--color-divider); }
.nav a.active {
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
}

@media (min-width: 900px) {
  .nav { display: flex; }
}

/* 顶栏右侧工具区 */
.topbar-tools {
  display: flex; align-items: center; gap: 6px;
  margin-left: auto;
}
.icon-btn {
  width: 40px; height: 40px; border-radius: var(--radius-pill);
  display: grid; place-items: center;
  color: var(--color-text-2);
  transition: background-color .15s ease, color .15s ease;
}
.icon-btn:hover { background: var(--color-divider); color: var(--color-text); }
.icon-btn .material-symbols-outlined { font-size: 22px; }
.icon-btn.primary { background: var(--color-primary); color: #fff; }
.icon-btn.primary:hover { background: var(--color-primary-deep); }

.avatar {
  width: 36px; height: 36px; border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #ff7a00, #ff3d68);
  color: #fff; font-weight: 700; font-size: 14px;
  display: grid; place-items: center;
  cursor: pointer;
  flex-shrink: 0;
}

/* 手机端汉堡按钮 */
.menu-btn { display: grid; }
@media (min-width: 900px) {
  .menu-btn { display: none; }
}

/* 顶栏搜索框（手机端隐藏，阶段 2 全局搜索再做） */
.search-box {
  display: none;
  align-items: center; gap: 8px;
  background: var(--color-divider);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  flex: 1; max-width: 360px;
  color: var(--color-text-2);
}
.search-box input {
  flex: 1; background: none; border: 0; outline: 0;
  color: var(--color-text);
  font-size: var(--fs-label);
}
.search-box input::placeholder { color: var(--color-text-3); }
@media (min-width: 900px) {
  .search-box { display: flex; }
}

/* ========== 侧栏抽屉（手机端） ========== */
.drawer-mask {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 90; opacity: 0; pointer-events: none;
  transition: opacity .2s ease;
}
.drawer-mask.open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: 80%; max-width: 320px;
  background: var(--color-card);
  z-index: 91;
  transform: translateX(-100%);
  transition: transform .25s ease;
  padding: 20px 16px;
  display: flex; flex-direction: column; gap: 8px;
  box-shadow: var(--shadow-pop);
}
.drawer.open { transform: translateX(0); }
.drawer a {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: var(--fs-body);
  color: var(--color-text-2);
  transition: background-color .15s ease;
}
.drawer a:hover { background: var(--color-divider); }
.drawer a.active {
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
}

/* ========== 主区 ========== */
.main {
  flex: 1;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-6) var(--grid-margin) var(--space-9);
}

/* 页面标题行（欢迎语等） */
.page-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
  flex-wrap: wrap;
}
.page-title {
  font-size: var(--fs-h1); font-weight: var(--fw-h1);
  color: var(--color-text);
}
.page-sub {
  color: var(--color-text-2);
  font-size: var(--fs-body);
  margin-top: 2px;
}

/* ========== 页脚 ========== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) var(--grid-margin);
  background: var(--color-card);
}
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-4);
}
.footer-brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--color-text-2);
  font-size: var(--fs-label);
}
.footer-links { display: flex; gap: var(--space-5); }
.footer-links a {
  color: var(--color-text-2);
  font-size: var(--fs-label);
  transition: color .15s ease;
}
.footer-links a:hover { color: var(--color-primary); }