add main menu

www/css/clock-scene.css

@@ -201,6 +201,34 @@ body {
         inset 0 1px 0 rgba(255, 255, 255, 0.8);
 }
 
+.clock-start-button {
+    appearance: none;
+    border: 1px solid rgba(107, 69, 35, 0.34);
+    border-radius: 999px;
+    padding: 0.7em 1.8em;
+    min-width: 170px;
+    background: linear-gradient(180deg, rgba(252, 242, 226, 0.98), rgba(226, 195, 150, 0.96));
+    color: #342012;
+    font-family: "Cinzel", serif;
+    font-size: clamp(1rem, 1.3vw, 1.35rem);
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+    cursor: pointer;
+    box-shadow:
+        0 8px 18px rgba(93, 57, 25, 0.14),
+        inset 0 1px 0 rgba(255, 255, 255, 0.8);
+    transition: transform 0.16s ease, filter 0.16s ease, box-shadow 0.16s ease;
+}
+
+.clock-start-button:active {
+    transform: scale(0.98);
+    filter: brightness(0.97);
+}
+
+.clock-start-button.is-hidden {
+    display: none;
+}
+
 .clock-time {
     font-size: clamp(4.8rem, 9vw, 8.4rem);
     line-height: 0.95;
@@ -267,3 +295,71 @@ body::before {
         min-height: 250px;
     }
 }
+
+@media (max-width: 600px) {
+    .clock-shell {
+        padding: max(14px, env(safe-area-inset-top)) 14px max(18px, env(safe-area-inset-bottom));
+        gap: 16px;
+    }
+
+    .clock-topbar {
+        gap: 10px;
+    }
+
+    .clock-status {
+        font-size: clamp(1.5rem, 7vw, 2.1rem);
+    }
+
+    .clock-mode {
+        min-width: 0;
+        width: min(78vw, 280px);
+        padding: 0.35em 0.9em;
+        font-size: clamp(1.4rem, 6vw, 2rem);
+    }
+
+    .clock-start-button {
+        min-width: 0;
+        width: min(72vw, 240px);
+        padding: 0.75em 1em;
+        font-size: clamp(0.95rem, 4vw, 1.1rem);
+    }
+
+    .clock-board {
+        gap: 14px;
+    }
+
+    .player-zone {
+        gap: 10px;
+    }
+
+    .player-badge {
+        min-width: 0;
+        width: min(58vw, 220px);
+        padding: 0.5em 1em;
+        font-size: clamp(1.2rem, 5vw, 1.7rem);
+    }
+
+    .clock-panel {
+        width: 100%;
+        min-height: calc((100vh - 210px) / 2);
+        max-height: 280px;
+        padding: 18px 16px;
+        border-radius: 28px;
+        gap: 10px;
+    }
+
+    .clock-divider {
+        width: 68%;
+        height: 6px;
+        min-height: 6px;
+    }
+
+    .clock-time {
+        font-size: clamp(3.2rem, 17vw, 5.4rem);
+    }
+
+    .clock-moves {
+        max-width: 92%;
+        font-size: clamp(1.5rem, 8vw, 2.5rem);
+    }
+}