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

:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #222632;
    --border: #2d3348;
    --primary: #6c5ce7;
    --primary-hover: #7e70f0;
    --danger: #e74c3c;
    --danger-hover: #c0392b;
    --success: #00b894;
    --warning: #fdcb6e;
    --text: #e8e8ed;
    --text-secondary: #8b8fa3;
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary), #a29bfe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 20px;
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.input-group {
    margin-bottom: 14px;
}

.input-group label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.truck-volume-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    background: var(--bg);
    border-radius: 8px;
    margin-top: 4px;
}

.truck-volume-info span {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.truck-volume-info strong {
    color: var(--primary);
    font-size: 1.05rem;
}

/* Buttons */
.btn {
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-add {
    width: 100%;
    background: var(--primary);
    color: white;
}

.btn-add:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-clear {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 6px 14px;
    font-size: 0.8rem;
}

.btn-clear:hover {
    background: var(--danger);
    color: white;
}

.btn-calculate {
    width: 100%;
    padding: 16px;
    font-size: 1.1rem;
    background: linear-gradient(135deg, var(--primary), #a29bfe);
    color: white;
    margin-bottom: 20px;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.35);
}

.btn-remove {
    background: transparent;
    color: var(--danger);
    border: none;
    padding: 4px 10px;
    font-size: 0.85rem;
    cursor: pointer;
}

.btn-remove:hover {
    color: var(--danger-hover);
}

/* Box List */
.box-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.empty-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 20px;
}

.box-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg);
    border-radius: 8px;
    border: 1px solid var(--border);
    animation: slideIn 0.25s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.box-item-info {
    display: flex;
    align-items: center;
    gap: 14px;
}

.box-item-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.box-item-name {
    font-weight: 600;
    font-size: 0.92rem;
}

.box-item-dims {
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.box-item-count {
    background: var(--surface2);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--primary);
    margin-right: 10px;
}

/* Progress Bar */
.progress-container {
    margin-bottom: 28px;
}

.progress-bar {
    position: relative;
    height: 40px;
    background: var(--bg);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    border-radius: 20px;
    background: linear-gradient(90deg, var(--success), var(--primary));
    transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    width: 0%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 700;
    font-size: 1rem;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    text-align: center;
    padding: 16px 10px;
    background: var(--bg);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.stat-icon {
    font-size: 1.4rem;
    margin-bottom: 6px;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Detail Results */
.detail-results {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.detail-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--bg);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.detail-item-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.detail-item-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.detail-item-name {
    font-weight: 600;
    font-size: 0.92rem;
}

.detail-item-dims {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.detail-item-right {
    text-align: right;
}

.detail-fitted {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--success);
}

.detail-not-fitted {
    font-size: 0.8rem;
    color: var(--danger);
}

/* Responsive */
@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    header h1 {
        font-size: 1.5rem;
    }
    .input-row {
        grid-template-columns: 1fr 1fr;
    }
}