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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --warning-color: #ea580c;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.upload-section,
.manual-input-section,
.remarks-section,
.action-section,
.report-preview {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.file-upload-group,
.input-group {
    display: grid;
    gap: 1.5rem;
}

.upload-item,
.input-item {
    border: 2px dashed var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.upload-item:hover,
.input-item:hover {
    border-color: var(--primary-color);
    background-color: #f8fafc;
}

label {
    display: block;
    margin-bottom: 0.75rem;
}

.label-text {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.label-hint {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9375rem;
    background-color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="file"]:hover {
    border-color: var(--primary-color);
}

input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.2s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.2s ease;
    min-height: 100px;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.remarks-input-group {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.remarks-input-group:focus-within {
    border-color: var(--primary-color);
    background-color: #f8fafc;
}

.char-counter {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: right;
}

.char-counter #charCount {
    font-weight: 600;
    color: var(--primary-color);
}

.file-status {
    display: inline-block;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
}

.file-status.uploaded {
    color: var(--success-color);
    font-weight: 600;
}

.action-section {
    text-align: center;
}

.primary-btn {
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.primary-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.primary-btn:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-top: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.metric-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.metric-card.revenue {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.metric-card.gift-card {
    background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
}

.metric-card.roas {
    background: linear-gradient(135deg, #4776e6 0%, #8e54e9 100%);
}

.metric-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
}

.status-message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    display: none;
}

.status-message.status-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.status-message.status-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.status-message.status-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.status-message.status-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.error-message {
    padding: 1rem;
    background-color: #fee2e2;
    color: var(--error-color);
    border: 1px solid var(--error-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .upload-section,
    .manual-input-section,
    .remarks-section,
    .action-section {
        padding: 1.5rem;
    }
}