add hook.py: terminal demo + claim + logo reveal opening scene (~7s)

AGENTS.md

@@ -32,6 +32,7 @@ Output goes to `output/videos/`.
 Files are at the repo root, **not** under `promo/` despite what `README.md` and `PROMO_GUIDE.md` reference in some spots.
 
 ```
+hook.py                 # Scene: Hook
 architecture.py          # Scene: Architecture
 continuous_batching.py  # Scene: ContinuousBatching
 cta.py                  # Scene: CTA
@@ -46,6 +47,7 @@ README.md               # Quick-start docs (may reference stale promo/ paths)
 
 | File | Class | Content | Est. duration |
 |------|-------|---------|---------------|
+| `hook.py` | `Hook` | Terminal demo + GPU comparison + logo reveal | ~18s |
 | `transformer.py` | `Transformer` | GQA attention (Q/K/V → RoPE → Attention → O) + spec card | ~35s |
 | `continuous_batching.py` | `ContinuousBatching` | 4-stage pipeline + throughput comparison (1.0x vs 3.4x) | ~30s |
 | `paged_cache.py` | `PrefixCache` | Paged KV cache: page table, on-demand growth, O(1) free | ~30s |

hook.py

@@ -0,0 +1,97 @@
+"""AstrAI promo: Hook — terminal demo + GPU comparison + logo reveal (~8s)."""
+
+from manim import *
+
+Text.set_default(font="Times New Roman")
+
+
+class Hook(Scene):
+    def construct(self):
+        BG = "#0d1117"
+        self.camera.background_color = BG
+        TERM = "#39ff14"
+
+        # ════ 0. Terminal  (0.0 – 2.8s) ════
+        tw, th = 10.0, 4.8
+        term_frame = Rectangle(
+            width=tw, height=th, color=WHITE, stroke_width=1.2,
+            fill_opacity=0.03, fill_color=TERM,
+        )
+        term_frame.to_edge(UP, buff=0.2)
+
+        lx = term_frame.get_left()[0] + 0.45
+        ty = term_frame.get_top()[1] - 0.45
+
+        prompt = Text("$ ", font_size=20, color=TERM, font="Consolas")
+        prompt.move_to([lx, ty, 0], aligned_edge=LEFT)
+
+        chat = Text("Hey, write a quicksort for me.",
+                    font_size=18, color=WHITE, font="Consolas")
+        chat.next_to(prompt, RIGHT, buff=0.08).align_to(prompt, DOWN)
+
+        resp = Text(">> ", font_size=18, color=GRAY, font="Consolas")
+        resp.next_to(prompt, DOWN, buff=0.55).align_to(prompt, LEFT)
+
+        hint = Text("Here is the implementation:",
+                    font_size=14, color=GRAY, font="Consolas")
+        hint.next_to(resp, DOWN, buff=0.20).align_to(prompt, LEFT)
+
+        INDENT = 0.27
+        code_lines = [
+            ("def quicksort(arr):", 0),
+            ("if len(arr) <= 1:", 1),
+            ("return arr", 2),
+            ("pivot = arr[len(arr)//2]", 1),
+            ("left  = [x for x in arr if x <  pivot]", 1),
+            ("right = [x for x in arr if x >= pivot]", 1),
+            ("return quicksort(left) + [pivot] + quicksort(right)", 1),
+        ]
+        code_vg = VGroup()
+        prev = hint
+        for text, level in code_lines:
+            cl = Text(text, font_size=13, color=TERM, font="Consolas")
+            cl.next_to(prev, DOWN, buff=0.08).align_to(prompt, LEFT).shift(RIGHT * level * INDENT)
+            code_vg.add(cl)
+            prev = cl
+
+        self.play(FadeIn(term_frame), run_time=0.3)
+        self.play(Write(prompt), run_time=0.1)
+        self.play(AddTextLetterByLetter(chat, time_per_char=0.018))
+        self.play(Write(resp), run_time=0.12)
+        self.play(Write(hint, lag_ratio=1.0), run_time=0.15)
+        self.play(Write(code_vg, lag_ratio=1.0), run_time=1.2)
+
+        self.play(
+            FadeOut(term_frame), FadeOut(prompt), FadeOut(chat),
+            FadeOut(resp), FadeOut(hint), FadeOut(code_vg),
+            run_time=0.3,
+        )
+
+        # ════ 1. Statement  (2.8 – 4.0s) ════
+        s1 = Text("LLMs Are Powerful", font_size=44, color=WHITE)
+        s2 = Text("but do they really need dozens of GPUs?",
+                  font_size=28, color=GRAY)
+        VGroup(s1, s2).arrange(DOWN, buff=0.25).move_to(UP * 1.0)
+        self.play(Write(s1), run_time=0.35)
+        self.play(Write(s2), run_time=0.3)
+        self.wait(0.25)
+        self.play(FadeOut(s1), FadeOut(s2), run_time=0.25)
+
+        # ════ 2. Logo  (4.0 – 7.0s) ════
+        logo = Text("AstrAI", font_size=80, color=BLUE)
+        glow = Text("AstrAI", font_size=80, color=BLUE_A, fill_opacity=0.3)
+        glow.move_to(logo).shift(UP * 0.015 + RIGHT * 0.015)
+
+        info = VGroup(
+            Text("1B Params  ·  Single GPU  ·  Open Source",
+                 font_size=22, color=GRAY),
+            Text("github.com/ViperEkura/AstrAI", font_size=17, color=YELLOW),
+        ).arrange(DOWN, buff=0.18)
+        everything = VGroup(VGroup(glow, logo), info).arrange(DOWN, buff=0.45)
+        everything.move_to(ORIGIN)
+
+        self.play(Write(logo), run_time=0.45)
+        self.play(Write(glow), run_time=0.08)
+        self.play(Write(info), run_time=0.3)
+        self.wait(1.8)
+        self.play(FadeOut(everything), run_time=0.4)

render_all.py

@@ -8,6 +8,7 @@ from pathlib import Path
 ROOT = Path(__file__).parent
 
 SCENES = [
+    ("hook.py", "Hook"),
     ("transformer.py", "Transformer"),
     ("architecture.py", "Architecture"),
     ("continuous_batching.py", "ContinuousBatching"),