/* Themes drive every color via CSS variables; .theme- on . */ .theme-classic { --bg: #faf8ef; --fg: #776e65; --muted: #8f8577; --panel: #bbada0; --cell: rgba(238, 228, 218, 0.35); --accent: #f67c5f; --button: #8f7a66; --button-fg: #f9f6f2; --border: #bbada0; --t-2-bg: #eee4da; --t-2-fg: #776e65; --t-4-bg: #ede0c8; --t-4-fg: #776e65; --t-8-bg: #f2b179; --t-8-fg: #f9f6f2; --t-16-bg: #f59563; --t-16-fg: #f9f6f2; --t-32-bg: #f67c5f; --t-32-fg: #f9f6f2; --t-64-bg: #f65e3b; --t-64-fg: #f9f6f2; --t-128-bg: #edcf72; --t-128-fg: #f9f6f2; --t-256-bg: #edcc61; --t-256-fg: #f9f6f2; --t-512-bg: #edc850; --t-512-fg: #f9f6f2; --t-1024-bg: #edc53f; --t-1024-fg: #f9f6f2; --t-2048-bg: #edc22e; --t-2048-fg: #f9f6f2; --t-super-bg:#3c3a32; --t-super-fg:#f9f6f2; } .theme-dark { --bg: #0f1115; --fg: #e6e8ec; --muted: #8a93a6; --panel: #1e222b; --cell: #272b35; --accent: #9ae6b4; --button: #272b35; --button-fg: #e6e8ec; --border: #272b35; --t-2-bg: #2a3042; --t-2-fg: #e6e8ec; --t-4-bg: #35406a; --t-4-fg: #e6e8ec; --t-8-bg: #4453a3; --t-8-fg: #f9f6f2; --t-16-bg: #5465c7; --t-16-fg: #f9f6f2; --t-32-bg: #637de2; --t-32-fg: #f9f6f2; --t-64-bg: #51a3d0; --t-64-fg: #f9f6f2; --t-128-bg: #3fb79b; --t-128-fg: #f9f6f2; --t-256-bg: #4cc98a; --t-256-fg: #f9f6f2; --t-512-bg: #a6d95c; --t-512-fg: #0f1115; --t-1024-bg: #e6d65c; --t-1024-fg: #0f1115; --t-2048-bg: #f7b955; --t-2048-fg: #0f1115; --t-super-bg:#f67c5f; --t-super-fg:#f9f6f2; } .theme-pastel { --bg: #fff6f8; --fg: #5b4a52; --muted: #a59098; --panel: #f6d6de; --cell: rgba(255, 255, 255, 0.55); --accent: #e57ea0; --button: #e57ea0; --button-fg: #fff; --border: #f6d6de; --t-2-bg: #fce4ec; --t-2-fg: #7a5a64; --t-4-bg: #f8bbd0; --t-4-fg: #7a5a64; --t-8-bg: #f48fb1; --t-8-fg: #fff; --t-16-bg: #f06292; --t-16-fg: #fff; --t-32-bg: #ec407a; --t-32-fg: #fff; --t-64-bg: #d81b60; --t-64-fg: #fff; --t-128-bg: #c8e6c9; --t-128-fg: #2e5030; --t-256-bg: #a5d6a7; --t-256-fg: #2e5030; --t-512-bg: #81d4fa; --t-512-fg: #154560; --t-1024-bg: #4fc3f7; --t-1024-fg: #154560; --t-2048-bg: #ffd54f; --t-2048-fg: #5b4a52; --t-super-bg:#5b4a52; --t-super-fg:#fff6f8; } * { box-sizing: border-box; } html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; font-size: 15px; line-height: 1.5; -webkit-tap-highlight-color: transparent; } header { padding: 24px clamp(16px, 4vw, 32px) 12px; max-width: 560px; margin: 0 auto; } .title-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; } header h1 { margin: 0; font-size: clamp(32px, 8vw, 48px); font-weight: 800; letter-spacing: -0.02em; } .scores { display: flex; gap: 8px; } .score-box { min-width: 72px; padding: 8px 12px; background: var(--panel); border-radius: 6px; text-align: center; color: var(--button-fg); display: flex; flex-direction: column; } .score-box span { font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.85; } .score-box strong { font-size: 18px; font-family: "SF Mono", Menlo, Consolas, monospace; } #subtitle { margin: 8px 0 16px; color: var(--muted); font-size: 14px; } .top-controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; } button { padding: 10px 16px; background: var(--button); color: var(--button-fg); border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-weight: 700; cursor: pointer; font-family: inherit; } button:hover { filter: brightness(1.05); } button.primary { background: var(--accent); border-color: var(--accent); color: var(--button-fg); } .group { display: flex; flex-direction: column; gap: 4px; } label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; } select { padding: 8px 10px; background: var(--panel); color: var(--button-fg); border: 1px solid var(--border); border-radius: 6px; font-size: 13px; font-family: inherit; } main { padding: 8px clamp(16px, 4vw, 32px) 32px; max-width: 560px; margin: 0 auto; } .board-wrap { position: relative; margin-top: 8px; } .board { display: grid; grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(4, 1fr); gap: clamp(8px, 2vw, 14px); padding: clamp(8px, 2vw, 14px); background: var(--panel); border-radius: 10px; aspect-ratio: 1 / 1; touch-action: none; user-select: none; } .cell { background: var(--cell); border-radius: 6px; position: relative; } .tile { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; border-radius: 6px; font-weight: 800; font-size: clamp(20px, 6vw, 38px); font-family: "SF Mono", Menlo, Consolas, monospace; animation: pop 140ms ease-out; } @keyframes pop { from { transform: scale(0.85); } to { transform: scale(1); } } .tile-2 { background: var(--t-2-bg); color: var(--t-2-fg); } .tile-4 { background: var(--t-4-bg); color: var(--t-4-fg); } .tile-8 { background: var(--t-8-bg); color: var(--t-8-fg); } .tile-16 { background: var(--t-16-bg); color: var(--t-16-fg); } .tile-32 { background: var(--t-32-bg); color: var(--t-32-fg); } .tile-64 { background: var(--t-64-bg); color: var(--t-64-fg); } .tile-128 { background: var(--t-128-bg); color: var(--t-128-fg); font-size: clamp(16px, 5vw, 32px); } .tile-256 { background: var(--t-256-bg); color: var(--t-256-fg); font-size: clamp(16px, 5vw, 32px); } .tile-512 { background: var(--t-512-bg); color: var(--t-512-fg); font-size: clamp(16px, 5vw, 32px); } .tile-1024 { background: var(--t-1024-bg); color: var(--t-1024-fg); font-size: clamp(14px, 4.4vw, 28px); } .tile-2048 { background: var(--t-2048-bg); color: var(--t-2048-fg); font-size: clamp(14px, 4.4vw, 28px); } .tile-super{ background: var(--t-super-bg);color: var(--t-super-fg);font-size: clamp(14px, 4.4vw, 28px); } .overlay[hidden] { display: none; } .overlay { position: absolute; inset: 0; background: rgba(238, 228, 218, 0.72); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; border-radius: 10px; backdrop-filter: blur(2px); } .theme-dark .overlay { background: rgba(15, 17, 21, 0.75); } .theme-pastel .overlay { background: rgba(255, 246, 248, 0.78); } .overlay p { margin: 0; font-size: clamp(24px, 6vw, 36px); font-weight: 800; color: var(--fg); } .hint { margin: 14px 0 0; color: var(--muted); font-size: 12px; text-align: center; } footer { padding: 20px 32px; color: var(--muted); font-size: 12px; text-align: center; }