/* ===== CSS Variables - Neo Brutalism ===== */
:root {
    /* Colors */
    --black: #0a0a0a;
    --black-light: #1a1a1a;
    --black-lighter: #252525;
    --red-dark: #8B0000;
    --red: #B22222;
    --red-bright: #DC143C;
    --gold: #D4AF37;
    --gold-light: #F4D03F;
    --white: #FAFAFA;
    --gray: #888888;
    --gray-dark: #444444;

    /* Diff Colors */
    --removed-bg: rgba(220, 38, 38, 0.3);
    --removed-text: #fca5a5;
    --removed-border: #dc2626;
    --added-bg: rgba(34, 197, 94, 0.3);
    --added-text: #86efac;
    --added-border: #22c55e;
    --accent: #D4AF37;

    /* Neo Brutalism */
    --border-width: 4px;
    --shadow-offset: 6px;
    --shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
    --shadow-gold: var(--shadow-offset) var(--shadow-offset) 0 var(--gold);
    --shadow-red: var(--shadow-offset) var(--shadow-offset) 0 var(--red-dark);

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --container-width: 1400px;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--black);
    color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
}

.text-accent {
    color: var(--accent);
}

/* ===== Container ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--black);
    border-bottom: var(--border-width) solid var(--white);
    padding: 16px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.nav-link {
    padding: 10px 20px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: var(--border-width) solid transparent;
    transition: all 0.15s ease;
}

.nav-link:hover {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
}

/* ===== Main ===== */
.main {
    flex: 1;
    padding: 120px 0 60px;
}

/* ===== Page Header ===== */
.page-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 40px;
}

.page-icon {
    width: 80px;
    height: 80px;
    background: var(--red-dark);
    border: var(--border-width) solid var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 4px 4px 0 var(--gold);
    flex-shrink: 0;
}

.page-icon svg {
    width: 40px;
    height: 40px;
    color: var(--white);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.page-description {
    color: var(--gray);
    font-size: 1.1rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: var(--border-width) solid var(--white);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--red-dark);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:active {
    background: var(--red);
    box-shadow: 2px 2px 0 var(--black);
    transform: translate(4px, 4px);
}

.btn-primary:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--gold);
}

.btn-secondary {
    background: var(--black-light);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-secondary:active {
    box-shadow: 2px 2px 0 var(--black);
    transform: translate(4px, 4px);
}

.btn-secondary:hover {
    background: var(--black-lighter);
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 var(--gold);
}

/* ===== Upload Panel ===== */
.upload-panel {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.upload-panel.hidden {
    display: none;
}

.drop-zone {
    border: 3px dashed var(--gray-dark);
    border-radius: 4px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--gold);
    background: rgba(212, 175, 55, 0.05);
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--gray);
    margin-bottom: 16px;
    transition: color 0.3s ease;
}

.drop-zone:hover .drop-icon,
.drop-zone.dragover .drop-icon {
    color: var(--gold);
}

.drop-text {
    font-size: 1.2rem;
    color: var(--gray);
    margin-bottom: 24px;
}

.hidden-input {
    display: none;
}

/* ===== Editor Panel ===== */
.editor-panel {
    display: block;
}

.editor-panel.hidden {
    display: none;
}

.editor-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
}

.panel-header {
    margin-bottom: 24px;
    border-bottom: 2px solid var(--gray-dark);
    padding-bottom: 12px;
}

.panel-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

/* Preview Section */
.preview-section {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

.preview-container {
    flex: 1;
    background: var(--black);
    border: 2px solid var(--gray-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    min-height: 400px;
    overflow: hidden;
    margin-bottom: 16px;
    /* Checkerboard pattern for transparent images */
    background-image:
        linear-gradient(45deg, #111 25%, transparent 25%),
        linear-gradient(-45deg, #111 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #111 75%),
        linear-gradient(-45deg, transparent 75%, #111 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

#image-preview {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.image-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    font-size: 0.9rem;
    color: var(--gray);
    font-family: var(--font-mono);
}

.badge {
    background: var(--gray-dark);
    color: var(--white);
    padding: 4px 10px;
    font-weight: 600;
    font-size: 0.8rem;
}

/* Options Section */
.options-section {
    background: var(--black-light);
    border: var(--border-width) solid var(--white);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

.form-group {
    margin-bottom: 24px;
}

.form-group>label {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.flex-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.flex-label label {
    font-size: 1.1rem;
    font-weight: 600;
}

#quality-value {
    font-family: var(--font-mono);
    color: var(--gold);
    font-weight: bold;
    font-size: 1.2rem;
}

.helper-text {
    font-size: 0.85rem;
    color: var(--gray);
    margin-top: 8px;
}

/* Custom Radios */
.format-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-label {
    display: block;
    cursor: pointer;
}

.radio-label input {
    display: none;
}

.radio-custom {
    display: block;
    padding: 14px 20px;
    border: 2px solid var(--gray-dark);
    background: var(--black);
    color: var(--gray);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.2s;
}

.radio-label input:checked+.radio-custom {
    border-color: var(--gold);
    background: rgba(212, 175, 55, 0.1);
    color: var(--gold);
    border-width: 3px;
    padding: 13px 19px;
    /* Compensate for border width */
}

/* Range Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 12px;
    background: var(--black);
    border: 2px solid var(--gray-dark);
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--gold);
    cursor: pointer;
    border: 2px solid var(--white);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--gold);
    cursor: pointer;
    border: 2px solid var(--white);
}

/* Conversion Result */
.conversion-result {
    margin-top: 16px;
    margin-bottom: 32px;
    padding: 20px;
    background: var(--black);
    border: 2px solid var(--gray-dark);
}

.conversion-result.hidden {
    display: none;
}

.stat-comparison {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--gray);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
}

.stat-arrow {
    color: var(--gray);
}

.stat-arrow svg {
    width: 24px;
    height: 24px;
}

.savings-badge {
    text-align: center;
    padding: 8px;
    background: var(--added-bg);
    color: var(--added-border);
    font-weight: bold;
    font-size: 0.95rem;
    border: 1px solid var(--added-border);
}

.savings-badge.worse {
    background: var(--removed-bg);
    color: var(--removed-border);
    border-color: var(--removed-border);
}

.panel-actions {
    margin-top: auto;
    display: flex;
    gap: 16px;
}

.panel-actions .btn {
    flex: 1;
}

/* ===== Footer ===== */
.footer {
    background: var(--red-dark);
    border-top: var(--border-width) solid var(--white);
    padding: 30px 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    height: 36px;
    width: auto;
    object-fit: contain;
}

.footer-copy {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--black);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-dark);
    border: 2px solid var(--black);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .page-header {
        flex-direction: column;
        text-align: center;
    }

    .page-title {
        font-size: 2rem;
    }

    .editor-grid {
        grid-template-columns: 1fr;
    }

    .panel-actions {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}