:root {
    --bg-color: #ffffff;
    --text-color: #202020;
    --border-color: #ccc;
    --btn-bg: #ddd;
    --link-color: #0000ed;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --border-color: #444;
    --btn-bg: #2a2a2a;
    --link-color: #1e90ff;
}

body {
    font-family: Arial, sans-serif;
    margin: 20px;
    position: relative;
    background-color: var(--bg-color);
    color: var(--text-color);
}

a {
  color: var(--link-color);
  font-weight: bold;
}

h1 {
    text-align: center
}

.grid {
    display: grid;
    grid-template-columns: repeat(10, minmax(100px, 1fr));
    gap: 0px;
}

.card {
    border: 1px solid var(--border-color);
    padding: 3px;
    text-align: center;
    background: var(--bg-color);
    display: flex;
    flex-direction: column
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 10px 5px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    vertical-align: middle;
}

button svg, .explain-btn svg {
    width: 20px;
    height: 20px;
    fill: var(--text-color) !important;
}

.button-container {
    text-align: center;
    margin-top: 20px;
}

.image {
    min-height: 100px;
    aspect-ratio: 264/352;
    background-color: var(--btn-bg);
    margin-bottom: 8px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover
}

.phrase {
    margin: 0 0 6px 0
}

.explain-btn {
    width: 100%;
    padding: 8px;
    background: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: auto;
    font-size: 14px;
    margin-left: 0;
    margin-right: 0;
}

#lang-toggle {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 100;
    padding: 8px 12px;
    font-size: 14px;
    margin: 0;
    background: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.overlay {
    position: fixed;
    inset: 0;
    background: transparent;
    display: none;
    z-index: 200
}

.panel {
    position: fixed;
    display: none;
    left: 0;
    top: 0;
    width: auto;
    max-width: 640px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
    padding: 12px;
    z-index: 210;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 160ms ease-in-out, transform 160ms ease-in-out;
    overflow: visible;
}

.panel.open {
    display: block;
    opacity: 1;
    transform: scale(1)
}

.panel h3 {
    margin: 0 0 8px 0;
    font-size: 15px
}

.panel .body {
    font-size: 14px;
    line-height: 1.3
}

.close-hint {
    font-size: 12px;
    color: #666;
    margin-top: 8px
}

@media (max-width:600px) {
    .panel {
        padding: 12px
    }
}

#theme-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 100;
    padding: 8px 12px;
    margin: 0;
    background: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}