:root {
    --accent: #4361ee;
    --accent-dark: #3a56d4;
    --success: #2ec4b6;
    --hero-gradient: linear-gradient(135deg, #4361ee 0%, #7209b7 100%);
}

[data-bs-theme="dark"] {
    --bs-body-bg: #1a1a2e;
    --bs-body-color: #e0e0e0;
    --hero-gradient: linear-gradient(135deg, #2d1b69 0%, #1a1a2e 100%);
}

.hero-section {
    background: var(--hero-gradient);
    color: #ffffff;
    padding: 4rem 0;
}

.hero-title {
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
    color: rgba(255,255,255,0.80);
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

/* Dark Mode Overrides */
[data-bs-theme="dark"] .bg-white {
    background-color: #16213e !important;
}

[data-bs-theme="dark"] .shadow-sm {
    box-shadow: 0 1px 3px rgba(0,0,0,0.4) !important;
}

[data-bs-theme="dark"] .text-muted {
    color: #a0a0b0 !important;
}

[data-bs-theme="dark"] .border-top {
    border-top-color: #2a2a4a !important;
}

[data-bs-theme="dark"] .bg-light-subtle {
    background-color: #0f3460 !important;
}

[data-bs-theme="dark"] .bg-light {
    background-color: #1a1a2e !important;
}

[data-bs-theme="dark"] .card {
    background-color: #16213e;
    border-color: #2a2a4a;
}

[data-bs-theme="dark"] .card-body {
    background-color: #16213e;
}

[data-bs-theme="dark"] .card-header {
    background-color: #1a2744;
    border-bottom-color: #2a2a4a;
}

[data-bs-theme="dark"] .card-footer {
    background-color: #1a2744;
    border-top-color: #2a2a4a;
}

[data-bs-theme="dark"] .card-title {
    color: #e0e0e0;
}

[data-bs-theme="dark"] .card-text {
    color: #a0a0b0;
}

[data-bs-theme="dark"] .card.border-success {
    border-color: #1a6b5a !important;
}

[data-bs-theme="dark"] .bg-light-subtle.rounded {
    background-color: #0f3460 !important;
    color: #e0e0e0;
}

[data-bs-theme="dark"] .navbar {
    background-color: #16213e !important;
    border-bottom: 1px solid #2a2a4a;
}

[data-bs-theme="dark"] .navbar .nav-link {
    color: #c0c0d0 !important;
}

[data-bs-theme="dark"] .navbar .nav-link:hover {
    color: #ffffff !important;
}

[data-bs-theme="dark"] .navbar-brand {
    color: #4361ee !important;
}

[data-bs-theme="dark"] .dropdown-menu {
    background-color: #1a2744;
    border-color: #2a2a4a;
}

[data-bs-theme="dark"] .dropdown-item {
    color: #c0c0d0;
}

[data-bs-theme="dark"] .dropdown-item:hover {
    background-color: #0f3460;
    color: #ffffff;
}

[data-bs-theme="dark"] .breadcrumb-item a {
    color: #6b8cff;
}

[data-bs-theme="dark"] .breadcrumb-item.active {
    color: #a0a0b0;
}

[data-bs-theme="dark"] .form-control, [data-bs-theme="dark"] .form-select {
    background-color: #1a2744;
    border-color: #3a3a5a;
    color: #e0e0e0;
}

[data-bs-theme="dark"] .form-control:focus, [data-bs-theme="dark"] .form-select:focus {
    background-color: #1a2744;
    border-color: #4361ee;
    color: #ffffff;
}

[data-bs-theme="dark"] .form-label {
    color: #c0c0d0;
}

[data-bs-theme="dark"] .form-check-label {
    color: #c0c0d0;
}

[data-bs-theme="dark"] .form-range::-webkit-slider-runnable-track {
    background-color: #2a2a4a;
}

[data-bs-theme="dark"] hr {
    border-color: #2a2a4a;
}

[data-bs-theme="dark"] small.text-muted, [data-bs-theme="dark"] p.text-muted {
    color: #8090a0 !important;
}

[data-bs-theme="dark"] .alert-warning {
    background-color: #2d2410;
    border-color: #5a4a20;
    color: #e0c080;
}

[data-bs-theme="dark"] .btn-outline-secondary {
    color: #a0a0b0;
    border-color: #3a3a5a;
}

[data-bs-theme="dark"] .btn-outline-secondary:hover {
    background-color: #0f3460;
    color: #ffffff;
    border-color: #4361ee;
}

/* Base */
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

footer {
    margin-top: auto;
}

.navbar-brand {
    font-size: 1.5rem;
}

.tool-card {
    transition: transform 0.2s, box-shadow 0.2s;
    border-radius: 12px;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12) !important;
}

[data-bs-theme="dark"] .tool-card:hover {
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.25) !important;
}

/* Dropzone */
.dropzone-wrapper {
    border: 2px dashed #dee2e6;
    border-radius: 12px;
    background: #f8f9fa;
    transition: border-color 0.3s, background 0.3s;
}

[data-bs-theme="dark"] .dropzone-wrapper {
    border-color: #3a3a5a;
    background: #1a2744;
}

.dropzone-wrapper:hover {
    border-color: var(--accent);
    background: rgba(67, 97, 238, 0.05);
}

[data-bs-theme="dark"] .dropzone-wrapper:hover {
    background: rgba(67, 97, 238, 0.08);
}

.dropzone {
    padding: 2rem;
    cursor: pointer;
}

.dropzone .dz-preview {
    margin: 0.5rem;
}

.dropzone .dz-preview .dz-image {
    border-radius: 8px;
}

.dropzone .dz-preview .dz-remove {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
}

[data-bs-theme="dark"] .dropzone .dz-preview .dz-details {
    color: #e0e0e0;
}

[data-bs-theme="dark"] .dropzone .dz-message h5 {
    color: #c0c0d0;
}

[data-bs-theme="dark"] .dropzone .dz-message p {
    color: #8090a0;
}

.btn-primary {
    background-color: var(--accent);
    border-color: var(--accent);
}

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

.btn-success {
    background-color: var(--success);
    border-color: var(--success);
}

.form-range::-webkit-slider-thumb {
    background: var(--accent);
}

.form-range::-moz-range-thumb {
    background: var(--accent);
}

.form-range::-ms-thumb {
    background: var(--accent);
}

.breadcrumb {
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.ad-subtle {
    opacity: 0.85;
    transition: opacity 0.3s;
}

.ad-subtle:hover {
    opacity: 1;
}

.ad-note {
    font-size: 0.75rem;
    color: #adb5bd;
}

.hover-lift {
    transition: transform 0.2s;
}

.hover-lift:hover {
    transform: translateY(-2px);
}

#progress-wrap .progress {
    border-radius: 12px;
}

#result .display-5 {
    font-size: 3rem;
}

.form-control-color {
    padding: 0.25rem;
}

@media (max-width: 576px) {
    .dropzone {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .display-4 {
        font-size: 2rem;
    }

    .hero-section {
        padding: 2rem 0;
    }
}