feat(ui): 弹层进出场过渡 + 首屏暖深色英雄（P2-6/P4-6）

- useMountTransition hook（延迟卸载播放退场，尊重 reduced-motion）+ vitest
- Drawer 淡入+滑入进出场；focus/scroll-lock 仍由 open 驱动、focus 键 shouldRender 防丢首焦
- Toast 入场 toast-in 动画（motion-safe）
- P4-6 首屏零作品用 callout 暖深色编辑部英雄（对标 cta-band-dark，不干扰工作库）
  新增 callout/on-callout/on-callout-soft 双主题成对 token

apps/web/app/globals.css

@@ -32,6 +32,10 @@
   --color-info: #4a5a6b;
   --color-conflict-mark: #b5543a26;
   --color-conflict-mark-strong: #b5543a8c;
+  /* 暖深色 callout：仅用于英雄/CTA 时刻（对标 DESIGN.md cta-band-dark），非内容底。 */
+  --color-callout: #201d18;
+  --color-on-callout: #f2ede2;
+  --color-on-callout-soft: #b8ae9c;
   --shadow-paper: #2b26200f;
   color-scheme: light;
 }
@@ -71,6 +75,10 @@
   --color-info: #8ca8ca;
   --color-conflict-mark: #ef8a7230;
   --color-conflict-mark-strong: #ef8a7290;
+  /* 夜读下 callout 为更深的凹陷暖井，仍与 bg 拉开层次。 */
+  --color-callout: #100e0c;
+  --color-on-callout: #efe6d7;
+  --color-on-callout-soft: #a89d8a;
   --shadow-paper: #00000045;
   color-scheme: dark;
 }
@@ -126,6 +134,21 @@ body {
   }
 }
 
+/* Toast 入场：淡入 + 轻微上移（尊重 prefers-reduced-motion，见下）。 */
+.toast-enter {
+  animation: toast-in var(--dur-base) var(--ease-standard);
+}
+@keyframes toast-in {
+  from {
+    opacity: 0;
+    transform: translateY(6px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
 @media (prefers-reduced-motion: reduce) {
   .typewriter-cursor {
     animation: none;
@@ -137,4 +160,7 @@ body {
     animation: none;
     outline: 2px solid var(--color-conflict);
   }
+  .toast-enter {
+    animation: none;
+  }
 }

apps/web/app/page.tsx

@@ -4,7 +4,6 @@ import { BookOpen, PenLine, Plus } from "lucide-react";
 import { AppShell } from "@/components/AppShell";
 import { BackendDownNotice } from "@/components/BackendDownNotice";
 import { ProjectLibrary } from "@/components/projects/ProjectLibrary";
-import { EmptyState } from "@/components/ui/EmptyState";
 import { PageContainer } from "@/components/ui/PageContainer";
 import { PageHeader } from "@/components/ui/PageHeader";
 import { fetchProjects } from "@/lib/api/server";
@@ -51,29 +50,32 @@ export default async function DashboardPage() {
         {loadError ? (
           <BackendDownNotice />
         ) : projects.length === 0 ? (
-          <EmptyState
+          // 首次进入的暖深色编辑部英雄（对标 DESIGN.md cta-band-dark；仅零作品时出现，不干扰工作库）。
-            icon={BookOpen}
+          <div className="rounded-xl border border-line/50 bg-callout px-8 py-14 text-center shadow-paper sm:px-12 sm:py-20">
-            title="还没有作品"
+            <BookOpen className="mx-auto h-9 w-9 text-cinnabar" aria-hidden="true" />
-            description="直接开始写，落笔即成书；或先立项，从一句灵感搭好设定、大纲再动笔。"
+            <h2 className="mt-5 font-serif text-display-sm text-on-callout">
-            action={
+              从一句灵感，写成一本书
-              <div className="flex flex-wrap items-center justify-center gap-2">
+            </h2>
-                <Link
+            <p className="mx-auto mt-3 max-w-md text-body leading-7 text-on-callout-soft">
-                  href="/write"
+              直接开始写，落笔即成书；或先立项，从一句灵感搭好设定、大纲再动笔。
-                  className={buttonClass({ variant: "primary" })}
+            </p>
-                >
+            <div className="mt-7 flex flex-wrap items-center justify-center gap-2">
-                  <PenLine className="h-4 w-4" aria-hidden="true" />
+              <Link
-                  直接开始写
+                href="/write"
-                </Link>
+                className={buttonClass({ variant: "primary", size: "lg" })}
-                <Link
+              >
-                  href="/projects/new"
+                <PenLine className="h-4 w-4" aria-hidden="true" />
-                  className={buttonClass({ variant: "secondary" })}
+                直接开始写
-                >
+              </Link>
-                  <Plus className="h-4 w-4" aria-hidden="true" />
+              <Link
-                  先立项
+                href="/projects/new"
-                </Link>
+                className={buttonClass({ variant: "secondary", size: "lg" })}
-              </div>
+              >
-            }
+                <Plus className="h-4 w-4" aria-hidden="true" />
-          />
+                先立项
+              </Link>
+            </div>
+          </div>
         ) : (
           <ProjectLibrary projects={projects} />
         )}

apps/web/components/Drawer.tsx

@@ -7,8 +7,12 @@ import { Button } from "@/components/ui/Button";
 import { handleTabTrap } from "@/lib/a11y/focusTrap";
 import { useRestoreFocus } from "@/lib/a11y/useRestoreFocus";
 import { useBodyScrollLock } from "@/lib/ui/useBodyScrollLock";
+import { useMountTransition } from "@/lib/ui/useMountTransition";
 import { overlayScrim } from "@/lib/ui/variants";
 
+// 抽屉进出场时长（与 --dur-base 一致）。
+const DRAWER_MS = 180;
+
 interface DrawerProps {
   open: boolean;
   onClose: () => void;
@@ -36,11 +40,15 @@ export function Drawer({
   const panelRef = useRef<HTMLDivElement>(null);
   const closeRef = useRef<HTMLButtonElement>(null);
 
+  const { shouldRender, isVisible } = useMountTransition(open, DRAWER_MS);
+
   useBodyScrollLock(open);
   useRestoreFocus(open, triggerRef);
 
   useEffect(() => {
-    if (!open) return;
+    // 面板真正挂载（shouldRender）且处于打开态时才装监听/落焦——
+    // 因进出场延迟了卸载，若仅依赖 open 会错过挂载帧导致首焦点丢失。
+    if (!open || !shouldRender) return;
     const onKey = (e: KeyboardEvent): void => {
       if (e.key === "Escape") {
         e.preventDefault();
@@ -51,14 +59,25 @@ export function Drawer({
     // 焦点陷阱首焦点落在具名关闭按钮上（而非整个面板）。
     closeRef.current?.focus();
     return () => window.removeEventListener("keydown", onKey);
-  }, [open, onClose]);
+  }, [open, shouldRender, onClose]);
 
-  if (!open) return null;
+  if (!shouldRender) return null;
 
   const sideClass = side === "left" ? "left-0 border-r" : "right-0 border-l";
+  const slideClass =
+    side === "left"
+      ? isVisible
+        ? "translate-x-0"
+        : "-translate-x-full"
+      : isVisible
+        ? "translate-x-0"
+        : "translate-x-full";
 
   return (
-    <div className={`${overlayScrim} lg:hidden`} onClick={onClose}>
+    <div
+      className={`${overlayScrim} lg:hidden motion-safe:transition-opacity motion-safe:duration-base ${isVisible ? "opacity-100" : "opacity-0"}`}
+      onClick={onClose}
+    >
       <div
         ref={panelRef}
         id={id}
@@ -70,7 +89,7 @@ export function Drawer({
           // focus trap：Tab/Shift+Tab 在抽屉内循环，不逃逸到背景（WCAG 2.1.2）。
           if (panelRef.current) handleTabTrap(panelRef.current, e);
         }}
-        className={`absolute top-0 h-full w-64 max-w-[80vw] overflow-auto overscroll-contain border-line bg-panel py-4 shadow-paper outline-none ${sideClass}`}
+        className={`absolute top-0 h-full w-64 max-w-[80vw] overflow-auto overscroll-contain border-line bg-panel py-4 shadow-paper outline-none motion-safe:transition-transform motion-safe:duration-base ease-standard ${sideClass} ${slideClass}`}
       >
         <div className="mb-2 flex justify-end px-2">
           <Button

apps/web/components/Toast.tsx

@@ -98,7 +98,7 @@ export function ToastProvider({ children }: { children: ReactNode }) {
   const renderItem = (t: ToastItem) => (
     <div
       key={t.id}
-      className={`pointer-events-auto flex items-center gap-3 rounded border px-4 py-2 text-sm shadow-paper ${toastShellClass(
+      className={`toast-enter pointer-events-auto flex items-center gap-3 rounded-md border px-4 py-2 text-sm shadow-paper ${toastShellClass(
         t.kind,
       )}`}
     >

apps/web/lib/ui/useMountTransition.test.ts

@@ -0,0 +1,53 @@
+// @vitest-environment jsdom
+import { act, renderHook } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { useMountTransition } from "./useMountTransition";
+
+beforeEach(() => {
+  vi.useFakeTimers();
+  // 让 rAF 同步执行，便于断言 isVisible 翻转。
+  vi.stubGlobal("requestAnimationFrame", (cb: FrameRequestCallback) => {
+    cb(0);
+    return 1;
+  });
+  vi.stubGlobal("cancelAnimationFrame", () => {});
+});
+
+afterEach(() => {
+  vi.useRealTimers();
+  vi.unstubAllGlobals();
+});
+
+describe("useMountTransition", () => {
+  it("renders nothing while closed", () => {
+    const { result } = renderHook(() => useMountTransition(false, 180));
+    expect(result.current.shouldRender).toBe(false);
+    expect(result.current.isVisible).toBe(false);
+  });
+
+  it("mounts and becomes visible when opened", () => {
+    const { result, rerender } = renderHook(
+      ({ open }) => useMountTransition(open, 180),
+      { initialProps: { open: false } },
+    );
+    act(() => rerender({ open: true }));
+    expect(result.current.shouldRender).toBe(true);
+    expect(result.current.isVisible).toBe(true);
+  });
+
+  it("keeps rendering during exit, then unmounts after the duration", () => {
+    const { result, rerender } = renderHook(
+      ({ open }) => useMountTransition(open, 180),
+      { initialProps: { open: true } },
+    );
+    act(() => rerender({ open: false }));
+    expect(result.current.isVisible).toBe(false);
+    expect(result.current.shouldRender).toBe(true);
+
+    act(() => {
+      vi.advanceTimersByTime(180);
+    });
+    expect(result.current.shouldRender).toBe(false);
+  });
+});

apps/web/lib/ui/useMountTransition.ts

@@ -0,0 +1,29 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+// 弹层进出场：打开即挂载并在下一帧置为可见（触发入场过渡）；关闭先置不可见播放出场，
+// 延迟 durationMs 后再卸载。调用方用 motion-safe: 门控过渡类——reduced-motion 下无动画，
+// 仍功能正常（仅多挂载 durationMs）。守住既有 focus-trap/scroll-lock：它们仍由 open 驱动，
+// 本 hook 只负责“延迟卸载”以便播放退场。
+export function useMountTransition(
+  isOpen: boolean,
+  durationMs: number,
+): { shouldRender: boolean; isVisible: boolean } {
+  const [shouldRender, setShouldRender] = useState(isOpen);
+  const [isVisible, setIsVisible] = useState(false);
+
+  useEffect(() => {
+    if (isOpen) {
+      setShouldRender(true);
+      // 下一帧再置可见，确保入场从初始（隐藏）态开始过渡。
+      const raf = requestAnimationFrame(() => setIsVisible(true));
+      return () => cancelAnimationFrame(raf);
+    }
+    setIsVisible(false);
+    const timer = window.setTimeout(() => setShouldRender(false), durationMs);
+    return () => window.clearTimeout(timer);
+  }, [isOpen, durationMs]);
+
+  return { shouldRender, isVisible };
+}

apps/web/tailwind.config.ts

@@ -25,6 +25,9 @@ const config: Config = {
         cinnabar: "var(--color-cinnabar)",
         "cinnabar-active": "var(--color-cinnabar-active)",
         "cinnabar-disabled": "var(--color-cinnabar-disabled)",
+        callout: "var(--color-callout)",
+        "on-callout": "var(--color-on-callout)",
+        "on-callout-soft": "var(--color-on-callout-soft)",
         conflict: "var(--color-conflict)",
         overdue: "var(--color-overdue)",
         pass: "var(--color-pass)",