:root {
    /* Light Mode (Default) */
    --bg-color: #f3f4f6;
    --card-bg: rgba(255, 255, 255, 0.7);
    --border-color: rgba(209, 213, 219, 0.8);
    --text-primary: #111827;
    --text-muted: #6b7280;
    --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.4);
    --gradient-start: #3b82f6;
    --gradient-end: #8b5cf6;

    --glass-bg: rgba(255, 255, 255, 0.8);
    --input-bg: rgba(255, 255, 255, 0.6);
    --input-focus-bg: rgba(255, 255, 255, 0.9);
    --upload-bg: rgba(255, 255, 255, 0.4);
    --upload-hover-bg: rgba(59, 130, 246, 0.05);
    --metric-bg: rgba(255, 255, 255, 0.5);
    --progress-bg: rgba(209, 213, 219, 0.6);
    --radial-glow: rgba(59, 130, 246, 0.08);
}

[data-bs-theme="dark"] {
    /* Dark Mode */
    --bg-color: #0d1117;
    --card-bg: rgba(22, 27, 34, 0.7);
    --border-color: rgba(48, 54, 61, 0.8);
    --text-primary: #c9d1d9;
    --text-muted: #8b949e;
    --accent-color: #58a6ff;
    --accent-glow: rgba(88, 166, 255, 0.4);
    --gradient-start: #58a6ff;
    --gradient-end: #bc8cff;

    --glass-bg: rgba(13, 17, 23, 0.8);
    --input-bg: rgba(1, 4, 9, 0.6);
    --input-focus-bg: rgba(1, 4, 9, 0.8);
    --upload-bg: rgba(1, 4, 9, 0.3);
    --upload-hover-bg: rgba(88, 166, 255, 0.05);
    --metric-bg: rgba(1, 4, 9, 0.5);
    --progress-bg: rgba(1, 4, 9, 0.6);
    --radial-glow: rgba(88, 166, 255, 0.05);
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Effects */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, var(--radial-glow) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

.bg-glass {
    background-color: var(--glass-bg) !important;
}

.blur-nav {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar .nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
    color: var(--accent-color) !important;
}

.text-gradient {
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-custom {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-custom:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 20px var(--accent-glow);
    border-color: rgba(88, 166, 255, 0.3);
}

/* Form Controls */
.form-control,
.form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--input-focus-bg);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.25rem var(--accent-glow);
    color: var(--text-primary);
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
}

.form-text {
    color: var(--text-muted);
}

/* Custom Buttons */
.btn-primary-custom {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border: none;
    color: #fff;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-primary-custom:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
    color: #fff;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--upload-bg);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--accent-color);
    background: var(--upload-hover-bg);
}

.upload-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.upload-area:hover .upload-icon {
    color: var(--accent-color);
}

#imagePreview {
    max-height: 250px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    display: none;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Progress Bar */
.progress {
    height: 10px;
    background-color: var(--progress-bg);
    border-radius: 5px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.progress-bar-animated-custom {
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    background-size: 200% 100%;
    animation: gradientMove 2s linear infinite;
}

@keyframes gradientMove {
    0% {
        background-position: 100% 0;
    }

    100% {
        background-position: -100% 0;
    }
}

/* Metrics Box */
.metric-box {
    background: var(--metric-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.metric-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}