:root {
    /* Color Palette */
    --bg-color: #f8f9fa;
    --text-color: #343a40;
    --text-light: #6c757d;
    --card-bg: #ffffff;
    --accent-color: #4361ee;
    --accent-hover: #3a56d4;
    --win-color: #4cc9f0;
    --lose-color: #f72585;
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: --bg-color;
    color: var(--text-color);
    line-height: 1.5;
    background-color: var(--bg-color);
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
.main-header {
    margin-bottom: var(--spacing-xl);
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

h1 {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-color);
}

/* Overall Summary */
.summary-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.stat-box {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-value.highlight {
    color: var(--accent-color);
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: var(--spacing-sm);
}

.progress-bar {
    height: 100%;
    background-color: var(--win-color);
    transition: width 0.3s ease;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background: var(--bg-color);
    border-color: var(--text-light);
}

.btn-danger {
    background: #ffe5e5;
    color: #e63946;
}

.btn-danger:hover {
    background: #ffcccc;
}

.data-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Rule Filter */
.rule-filter {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: 4px;
}

.filter-tab {
    padding: 10px 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.filter-tab:hover {
    background: var(--bg-color);
}

.filter-tab.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: var(--shadow-md);
}

/* Grid */
.stages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* Stage Card */
.stage-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 0;
    /* Remove padding to let image fill top */
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid transparent;
    overflow: hidden;
    /* For image corners */
    display: flex;
    flex-direction: column;
}

.stage-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-color);
}

.stage-image-container {
    width: 100%;
    height: 160px;
    background-color: #eee;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stage-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.stage-image-placeholder {
    color: var(--text-light);
    font-size: 0.8rem;
    font-weight: 600;
}

.stage-content {
    padding: var(--spacing-lg);
}

.stage-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.battle-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.battle-stat-item {
    text-align: center;
}

.battle-stat-label {
    font-size: 0.75rem;
    color: var(--text-light);
    display: block;
}

.battle-stat-val {
    font-weight: 700;
    font-size: 1.1rem;
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.action-group {
    display: flex;
    gap: 4px;
}

.btn-main {
    flex: 1;
    justify-content: center;
}

.btn-sub {
    padding: 8px 12px;
    font-weight: bold;
    justify-content: center;
}

.btn-win {
    background-color: transparent;
    border: 2px solid var(--win-color);
    color: var(--win-color);
    padding: 10px;
}

.btn-win:hover,
.btn-win:active {
    background-color: var(--win-color);
    color: white;
}

.btn-lose {
    background-color: transparent;
    border: 2px solid var(--lose-color);
    color: var(--lose-color);
    padding: 10px;
}

.btn-lose:hover,
.btn-lose:active {
    background-color: var(--lose-color);
    color: white;
}

.win-rate-indicator {
    height: 4px;
    background: #eee;
    margin-top: var(--spacing-xs);
    border-radius: 2px;
    overflow: hidden;
}

.win-rate-fill {
    height: 100%;
    background: var(--accent-color);
}