/* ==========================================================================
   StudyOps — shell.css
   Hero 转场、工作台外壳、轨道导航、移动端抽屉（自原 styles.css 拆出）
   ========================================================================== */
/* ---------- STAGE 1: Hero ---------- */
.hero {
  height: 100vh;
  height: 100dvh;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 40px 48px 24px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(128, 128, 128, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(128, 128, 128, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
}

.hero-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 10;
}

.hero-brand { display: flex; align-items: center; gap: 12px; }
.logo-img { object-fit: contain; }
.logo-hero { height: 26px; width: auto; }
.logo-rail { height: 34px; width: auto; }

.hero-nav-right { display: flex; align-items: center; gap: 10px; font-size: 12px; }

/* GitHub 风格按钮：icon + label + count，浅灰底细边框圆角 6px */
.gh-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--shell-border);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text);
  font-size: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", system-ui, sans-serif;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  cursor: pointer;
}
.gh-btn:hover { background-color: var(--hover); border-color: var(--accent); color: var(--accent); }
.gh-btn:hover .gh-count { color: var(--accent); }

.gh-count {
  margin-left: 4px;
  padding-left: 8px;
  border-left: 1px solid var(--shell-border);
  color: var(--sub);
  font-size: 11px;
}

/* Hero 主按钮：实心 accent（GitHub primary 风格） */
.btn-primary {
  padding: 6px 16px;
  border-radius: 6px;
  background-color: var(--accent);
  border: 1px solid var(--accent);
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", system-ui, sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: filter 0.2s ease, transform 0.1s ease;
  cursor: pointer;
}
.btn-primary:hover { filter: brightness(1.1); }
.btn-primary:active { transform: scale(0.96); }

.hero-center {
  max-width: 768px;
  margin: auto;
  text-align: center;
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.hero-title {
  margin: 0;
  font-size: clamp(3rem, 7vw, 4.5rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-weight: 400;
}

.hero-sub {
  margin: 0;
  font-size: 15px;
  max-width: 576px;
  line-height: 1.7;
  color: var(--sub);
}

.hero-scroll { padding-top: 16px; display: flex; justify-content: center; }

.hero-scroll-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  transition: transform 0.2s ease;
}
.hero-scroll-btn:hover { transform: translateY(4px); }
.hero-scroll-label { color: var(--sub); letter-spacing: 0.08em; }

.hero-scroll-circle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid currentColor;
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.hero-scroll-btn:hover .hero-scroll-circle {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- STAGE 2: Workspace Shell ---------- */
/* 手势转场：工作台为 fixed 全屏面板，初始停在屏外下方，
   触发后经 cubic-bezier 缓动滑入拼接；进入后单向锁定（页面本身不可滚动） */
.workspace {
  position: fixed;
  inset: 0;
  width: 100%;
  transform: translateY(100%);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
  z-index: 20;
}

html.entered .workspace { transform: translateY(0); }

/* 转场完成后隐藏 Hero，彻底退出渲染与可访问树 */
.hero.hero-hidden { visibility: hidden; }

.shell {
  height: 100vh;
  height: 100dvh;
  width: 100%;
  border-radius: 36px 36px 0 0;
  border-top: 1px solid var(--shell-border);
  background-color: var(--shell-bg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  display: flex;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Main area (85%) */
.main {
  width: 85%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 32px 48px 48px;
}

/* Rail (15%) */
.rail {
  width: 15%;
  min-width: 170px;
  height: 100%;
  border-left: 1px solid var(--rail-border);
  background-color: var(--rail-bg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  user-select: none;
  z-index: 10;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.rail-top {
  min-height: 0;
  display: flex;
  flex: 1;
  flex-direction: column;
}

/* 右栏只保留品牌图标、倒计时按钮和导航；头部虚线作为分隔。 */
.rail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0 0 14px 12px;
  border-bottom: 1px dashed var(--border);
}
.rail-logo { padding: 0; flex-shrink: 0; }
.rail-toggle {
  width: 28px;
  min-width: 28px;
  min-height: 28px;
  margin-left: auto;
  padding: 4px;
  border: 0;
  border-radius: 4px;
  color: var(--sub);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.rail-toggle .icon { width: 20px; height: 20px; }
.rail-toggle:hover { background-color: var(--hover); color: var(--text); }

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
  overflow-y: auto;
  padding-right: 2px;
}

.rail-nav-item {
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid transparent;
  color: var(--sub);
  transition: background-color 0.15s ease, color 0.15s ease,
    border-color 0.15s ease, transform 0.1s ease;
}
.rail-nav-item:hover { background-color: var(--hover); }
.rail-nav-item.active {
  background-color: var(--nav-active-bg);
  color: var(--nav-active-text);
  font-weight: 700;
  border-color: var(--nav-active-border);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.rail-nav-left { display: flex; align-items: center; gap: 10px; overflow: hidden; }
.rail-nav-icon { width: 18px; height: 18px; flex: 0 0 18px; color: currentColor; opacity: 0.78; }
.rail-nav-id { font-size: 10px; opacity: 0.6; flex-shrink: 0; }
.rail-nav-key { letter-spacing: 0.05em; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rail-nav-dot { width: 6px; height: 6px; border-radius: 50%; background-color: var(--accent); flex-shrink: 0; }

.rail-bottom {
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.rail-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.ctl-btn {
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.ctl-btn:hover { background-color: var(--hover); }
.ctl-label { font-size: 10px; font-weight: 500; }


/* ---------- 工作台"拼接板块"：内部元素去圆角（Hero 装饰保持原样） ---------- */
.shell, .card, .panel, .badge, .badge-ontrack, .tag-chip,
.btn-tab, .btn-pill, .btn-mini, .btn-add-entry, .btn-copy,
.task-row, .log-row, .tl-year, .tpl-box, .ded-row,
.modal-card, .modal-input, .btn-modal-cancel, .btn-modal-submit,
.rail-nav-item, .ctl-btn, .term-search, .math-corollary,
.math-steps li, .rolle-conds li {
  border-radius: 2px;
}

.shell, .progress-track, .progress-fill { border-radius: 0; }

/* 参考侧栏的收起按钮：收起后保留完整小 Logo 与 01/02 编号导航。 */
.shell.rail-collapsed .main { width: calc(100% - 80px); }
.shell.rail-collapsed .rail { width: 80px; min-width: 80px; padding-left: 12px; padding-right: 12px; }
.shell.rail-collapsed .rail-head {
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-left: 0;
  padding-right: 0;
}
.shell.rail-collapsed .rail-logo { width: 52px; overflow: visible; display: flex; justify-content: center; }
.shell.rail-collapsed .logo-rail { width: 52px; height: auto; object-fit: contain; }
.shell.rail-collapsed .rail-toggle { width: 26px; min-width: 26px; min-height: 26px; margin-left: 0; }
.shell.rail-collapsed .rail-toggle .icon { transform: rotate(180deg); }
.shell.rail-collapsed .rail-nav-item { justify-content: center; padding-left: 8px; padding-right: 8px; }
.shell.rail-collapsed .rail-nav-left { gap: 0; justify-content: center; }
.shell.rail-collapsed .rail-nav-id { display: inline; font-size: 11px; opacity: 0.85; }
.shell.rail-collapsed .rail-nav-key,
.shell.rail-collapsed .rail-nav-dot { display: none; }
.shell.rail-collapsed .rail-controls { grid-template-columns: 1fr; gap: 6px; }
.shell.rail-collapsed .ctl-btn { width: 40px; min-width: 40px; margin: 0 auto; padding: 6px; }
.shell.rail-collapsed .ctl-label { display: none; }

/* ---------- 轨道导航中文主标签 + 英文次级小字 ---------- */
.rail-nav-key {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.rail-nav-sub {
  font-size: 9px;
  opacity: 0.45;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .rail-nav-sub { display: none; }

  /* 移动端不收起侧栏，保留顶部横向导航。 */
  .rail-toggle { width: 28px; min-width: 28px; }
}


/* 移动端汉堡按钮：桌面隐藏（min-width 写法避免加载顺序覆盖） */
@media (min-width: 901px) {
  .mobile-menu { display: none; }
  .drawer-backdrop { display: none; }
}