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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #3b82f6;
    --accent: #06b6d4;
    --text: #e5e7eb;
    --text-light: #9ca3af;
    --bg: #0f172a;
    --bg-light: #1e293b;
    --bg-card: #1e293b;
    --border: #334155;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 20px 25px rgba(0,0,0,0.4);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #E64833;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-menu a:hover {
    color: #E64833;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #3b82f6 50%, #8b5cf6 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Tools Section */
.tools-section {
    margin: 3rem 0;
}

.tools-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s ease;
    cursor: pointer;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tool-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Features */
.features {
    margin: 4rem 0;
    padding: 3rem 0;
    text-align: center;
}

.features h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.feature p {
    color: var(--text-light);
}

/* Ad Container */
.ad-container {
    margin: 2rem 0;
    text-align: center;
}

.ad-placeholder {
    background: var(--bg);
    border: 2px dashed var(--border);
    padding: 2rem;
    border-radius: 8px;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Footer */
footer {
    background: var(--bg-card);
    color: var(--text);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--border);
}

footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

/* Tool Page Styles */
.tool-page {
    padding: 3rem 0;
}

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

.tool-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.tool-header p {
    font-size: 1.1rem;
    color: var(--text-light);
}

.tool-content {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto 2rem;
    border: 1px solid var(--border);
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
}

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin: 0.5rem;
}

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

.btn:disabled {
    background: var(--border);
    cursor: not-allowed;
}

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

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

input[type="file"] {
    display: none;
}

.file-list {
    margin: 1rem 0;
}

.file-item {
    background: var(--bg);
    padding: 1rem;
    border-radius: 6px;
    margin: 0.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border);
}

.progress {
    height: 8px;
    background: var(--bg);
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
    border: 1px solid var(--border);
}

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

.result {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 8px;
    text-align: center;
}

.error {
    background: #fef2f2;
    border-color: #ef4444;
    color: #991b1b;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    background: var(--bg);
    color: var(--text);
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat {
    background: var(--bg);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #E64833;
}

.stat-label {
    color: var(--text);
    font-size: 0.9rem;
}

#qrcode {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    margin: 0.5rem 0;
    background: var(--bg);
    color: var(--text);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
}

label {
    display: block;
    margin: 1rem 0 0.5rem;
    font-weight: 600;
    color: var(--text);
}

.form-group {
    margin: 1.5rem 0;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: #E64833;
    text-decoration: none;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-content {
        padding: 1.5rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text: #e5e7eb;
        --text-light: #9ca3af;
        --bg: #1f2937;
        --bg-light: #111827;
        --border: #374151;
        --shadow: 0 1px 3px rgba(0,0,0,0.3);
        --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
    }
    
    body {
        background: var(--bg-light);
        color: var(--text);
    }
    
    .navbar {
        background: var(--bg);
        border-bottom: 1px solid var(--border);
    }
    
    .tool-card {
        background: var(--bg);
        border-color: var(--border);
    }
    
    .tool-card:hover {
        background: #374151;
    }
    
    .tool-content {
        background: var(--bg);
        border: 1px solid var(--border);
    }
    
    .upload-area {
        background: #1f2937;
        border-color: var(--border);
    }
    
    .upload-area:hover,
    .upload-area.dragover {
        background: #374151;
        border-color: var(--primary);
    }
    
    .file-item {
        background: #374151;
    }
    
    .stat {
        background: #1f2937;
    }
    
    textarea,
    input[type="text"],
    input[type="number"],
    select {
        background: #1f2937;
        border-color: var(--border);
        color: var(--text);
    }
    
    .ad-placeholder {
        background: #1f2937;
        border-color: var(--border);
    }
    
    .feature {
        background: var(--bg);
        padding: 1.5rem;
        border-radius: 8px;
    }
    
    .result {
        background: #1f2937 !important;
        border-color: var(--secondary) !important;
    }
    
    .result.error {
        background: #7f1d1d !important;
        border-color: #ef4444 !important;
    }
    
    /* Better text contrast in dark mode - override inline styles */
    .tool-content ol,
    .tool-content ul,
    .tool-content p,
    .tool-content li {
        color: var(--text) !important;
    }
    
    .tool-content h3,
    .tool-content h4 {
        color: var(--text);
    }
    
    /* Fix upload area text */
    .upload-area h3,
    .upload-area p {
        color: var(--text) !important;
    }
    
    /* Fix file list text */
    .file-item span,
    .file-item p {
        color: var(--text) !important;
    }
}