:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --input-bg: rgba(15, 23, 42, 0.6);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.3);
    --border-color: rgba(148, 163, 184, 0.1);
    --font-family: 'Inter', 'Noto Sans JP', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.1) 0%, transparent 20%);
}

.app-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.sticky-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    margin: -2rem -2rem 0 -2rem;
    padding: 2.5rem 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
}

.header-damage {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(56, 189, 248, 0.1);
    padding: 0.5rem 1.55rem;
    border-radius: 12px;
    border: 1px solid rgba(56, 189, 248, 0.2);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    max-width: 90vw;
    width: auto;
    justify-content: center;
    overflow: hidden;
}

.header-damage-label {
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
}

#headerDamageValue {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    font-feature-settings: "tnum";
    font-variant-numeric: tabular-nums;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.input-group {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-group:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.primary-panel {
    border: 2px solid rgba(56, 189, 248, 0.3);
    background: rgba(30, 41, 59, 0.85);
    box-shadow: 0 4px 12px -1px rgba(56, 189, 248, 0.15), 0 2px 6px -1px rgba(0, 0, 0, 0.1);
}

.primary-panel:hover {
    border-color: rgba(56, 189, 248, 0.4);
    box-shadow: 0 8px 16px -2px rgba(56, 189, 248, 0.2), 0 4px 8px -2px rgba(0, 0, 0, 0.15);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.input-item {
    margin-bottom: 1rem;
}

.input-item:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.note {
    font-size: 0.75rem;
    opacity: 0.7;
}

input[type="number"],
select {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: all 0.2s ease;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="number"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: rgba(15, 23, 42, 0.3);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(148, 163, 184, 0.3);
    transition: 0.3s;
    border-radius: 26px;
    border: 1px solid var(--border-color);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked+.toggle-slider {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

input:checked+.toggle-slider:before {
    transform: translateX(24px);
    background-color: white;
}

.toggle-slider:hover {
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.toggle-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    user-select: none;
}

input:checked~.toggle-label {
    color: var(--accent-color);
    font-weight: 500;
}

/* Advanced Settings & Controls */
.advanced-setting {
    display: none;
}

.header-controls-left {
    position: absolute;
    left: 0;
}

.header-controls-right {
    position: absolute;
    right: 0;
}

.control-btn {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(56, 189, 248, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-family);
    font-weight: 500;
    transition: all 0.2s ease;
    min-width: 60px;
}

.control-btn:hover {
    background: rgba(56, 189, 248, 0.2);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.slot-info-panel {
    grid-column: 1 / -1;
}

.slot-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
}

.slot-list li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    background: var(--input-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }
}