:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #f3f4f6;
    --card-background: #ffffff;
    --text-color: #1f2937;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --drop-bg: #fafafa;
    --drop-active: #eff6ff;
    --report-bg: #f9fafb;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #60a5fa;
    --background-color: #111827;
    --card-background: #1f2937;
    --text-color: #f3f4f6;
    --border-color: #374151;
    --drop-bg: #1f2937;
    --drop-active: #374151;
    --report-bg: #374151;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

.header-content {
    text-align: left;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: var(--border-color);
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    color: var(--text-color);
    opacity: 0.8;
    font-size: 1.2rem;
}

.upload-section, .results-section {
    background: var(--card-background);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    transition: background-color 0.3s;
}

h2 {
    margin-bottom: 20px;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* File Upload Styling */
.file-drop-area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
    padding: 40px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    transition: 0.2s;
    background-color: var(--drop-bg);
    margin-bottom: 20px;
}

.file-drop-area.is-active {
    background-color: var(--drop-active);
    border-color: var(--primary-color);
}

.fake-btn {
    flex-shrink: 0;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    padding: 8px 15px;
    margin-bottom: 10px;
    font-size: 14px;
    text-transform: uppercase;
    color: white;
    cursor: pointer;
}

.file-msg {
    font-size: small;
    font-weight: 300;
    color: #9ca3af;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    cursor: pointer;
    opacity: 0;
}

.preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.preview-image {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
}

.btn-secondary {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--card-background);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.action-buttons button {
    flex: 1;
    min-width: 200px;
}

/* Loader */
.hidden {
    display: none;
}

#loadingSection {
    text-align: center;
    padding: 40px;
}

.loader {
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Results */
.report-card {
    background: var(--report-bg);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 5px solid var(--primary-color);
    transition: background-color 0.3s;
}

.report-card h3 {
    margin-bottom: 15px;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.report-card.vision { border-left-color: var(--primary-color); }
.report-card.logic { border-left-color: var(--warning-color); }
.report-card.budget { border-left-color: var(--success-color); }
.report-card.summary { border-left-color: var(--text-color); }

ul {
    list-style-position: inside;
    margin-left: 10px;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.cost-total {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--success-color);
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
}