:root {
    --bg-color: #f0f4f8;
    --text-color: #334155;
    --accent-color: #2dd4bf;
    --grid-size: min(75vw, 500px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    color: var(--text-color);
}

.centering-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
}

header { text-align: center; margin-bottom: 20px; }
h1 { color: #1e293b; margin: 0; font-size: 1.4rem; }

.meter-outer-box {
    display: flex;
    align-items: center;
    background: white;
    padding: 30px 25px 60px 10px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    position: relative;
    margin: 0 auto;
}

.y-axis-label-container {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: var(--grid-size);
    margin-right: 5px;
    color: #64748b;
    font-weight: bold;
    flex-shrink: 0;
}
.y-label-text { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.1em; font-size: 0.75rem; }
.y-label-edge { font-size: 0.7rem; }

.grid-layout {
    display: grid;
    grid-template-columns: 22px var(--grid-size);
    grid-template-rows: var(--grid-size) 22px;
    gap: 4px;
}

.y-numbers, .x-numbers {
    display: grid;
    color: #94a3b8;
    font-weight: bold;
    font-size: 0.7rem;
}
.y-numbers { grid-template-rows: repeat(10, 1fr); align-items: center; text-align: right; padding-right: 5px; }
.x-numbers { grid-template-columns: repeat(10, 1fr); justify-items: center; align-items: center; }

.grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    border: 1.5px solid #e2e8f0;
    gap: 1px;
}

.cell { width: 100%; height: 100%; cursor: pointer; transition: 0.1s; }

.x-axis-label-container {
    position: absolute;
    bottom: 15px;
    left: 37px;
    width: var(--grid-size);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #64748b;
    font-weight: bold;
}
.x-label-main { color: #334155; font-size: 0.85rem; letter-spacing: 0.1em; text-align: center; flex-grow: 1; }
.x-label-edge { font-size: 0.7rem; white-space: nowrap; width: 60px; }
.x-label-edge:last-child { text-align: right; }

.log-input-area, .history-section { width: 100%; max-width: 450px; margin-top: 20px; }
.log-input-area {
    background: white; padding: 15px; border-radius: 15px;
    display: flex; flex-direction: column; gap: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

#selected-emotion-jp { display: block; font-size: 1.4rem; font-weight: bold; color: #1e293b; text-align: center; }
#selected-emotion-en { display: block; font-size: 0.8rem; color: #64748b; text-align: center; font-style: italic; }

#memo-input { padding: 10px; border: 2px solid #e2e8f0; border-radius: 8px; font-size: 0.9rem; }
#save-btn { padding: 12px; background: var(--accent-color); color: white; border: none; border-radius: 8px; font-weight: bold; cursor: pointer; }
#save-btn:disabled { background: #cbd5e1; }

.history-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.share-btn { background: #007aff; color: white; border: none; padding: 6px 10px; border-radius: 6px; font-weight: bold; font-size: 0.7rem; cursor: pointer; }

.history-item {
    background: white; padding: 12px; margin-bottom: 8px; border-radius: 10px;
    display: flex; justify-content: space-between; align-items: center;
    border-left: 6px solid #ccc; box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.delete-btn { background: #fee2e2; color: #ef4444; border: none; padding: 5px 8px; border-radius: 4px; cursor: pointer; font-size: 0.7rem; }

footer { margin-top: 30px; padding-bottom: 20px; color: #94a3b8; font-size: 0.7rem; text-align: center; }

@media (max-width: 600px) {
    :root { --grid-size: 260px; }
    .meter-outer-box { padding: 25px 20px 55px 5px; }
    .y-axis-label-container { margin-right: 3px; }
    .x-axis-label-container { left: 30px; width: 260px; }
    .x-label-main { font-size: 0.75rem; }
}