/* ============================================
   Image Format Detector - Modern Styling
   Dark mode support with light mode default
   ============================================ */

:root {
    --transition-speed: 0.25s;
    --primary: #3399cc;
    --primary-light: #E0F4FF;
    --primary-dark: #2980b9;
    --accent: #38BDF8;
    --success: #339966;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #e64e4e;
    --danger-light: #FEE2E2;
    --info: #3399cc;
    --info-light: #DBEAFE;
    --bg: #F8FAFC;
    --bg-elevated: #FFFFFF;
    --bg-secondary: #F1F5F9;
    --bg-tertiary: #E2E8F0;
    --text: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --shadow-primary: 0 4px 14px rgba(51, 153, 204, 0.25);
    --shadow-primary-hover: 0 6px 20px rgba(51, 153, 204, 0.35);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --checker-light: #f0f0f0;
    --checker-dark: #e0e0e0;
    --input-bg: #FFFFFF;
    --input-border: #E2E8F0;
}

[data-theme="dark"] {
    --primary: #38BDF8;
    --primary-light: rgba(56, 189, 248, 0.15);
    --primary-dark: #0EA5E9;
    --accent: #7DD3FC;
    --success: #4ADE80;
    --success-light: rgba(74, 222, 128, 0.15);
    --warning: #FBBF24;
    --warning-light: rgba(251, 191, 36, 0.15);
    --danger: #F87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    --info: #60A5FA;
    --info-light: rgba(96, 165, 250, 0.15);
    --bg: #0F172A;
    --bg-elevated: #1E293B;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    --text: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --border: #334155;
    --border-light: #475569;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    --shadow-primary: 0 4px 14px rgba(56, 189, 248, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(56, 189, 248, 0.3);
    --checker-light: #334155;
    --checker-dark: #475569;
    --input-bg: #334155;
    --input-border: #475569;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Layout */
.tool-container { max-width: 1000px; margin: 0 auto; padding: 2rem; }
.tool-header { text-align: center; margin-bottom: 2rem; }

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tool-icon-wrapper {
    width: 64px; height: 64px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    color: white;
    box-shadow: var(--shadow-primary);
    flex-shrink: 0;
}

.tool-icon-wrapper svg, .tool-icon-wrapper i { width: 28px; height: 28px; }

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.tool-description a { color: var(--primary); text-decoration: none; }
.tool-description a:hover { text-decoration: underline; }

/* Main Tool Area */
.tool-main {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* Upload Section */
.upload-section { padding: 3rem; }

.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute; inset: 0;
    background: var(--primary-light);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.upload-area:hover, .upload-area.drag-over {
    border-color: var(--primary);
    background: var(--bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.upload-area:hover::before, .upload-area.drag-over::before { opacity: 0.5; }
.upload-content { position: relative; z-index: 1; }

.upload-icon {
    color: var(--primary);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon { transform: translateY(-5px); }

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.upload-subtitle {
    color: var(--text-secondary);
    margin: 0 0 1rem;
    font-size: 1rem;
}

.file-types {
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.file-type-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ============================================
   RESULTS SECTION
   ============================================ */

.results-section {
    padding: 2rem;
    animation: fadeIn 0.4s ease;
}

/* Result Hero - Preview + Summary */
.result-hero {
    display: flex;
    gap: 2rem;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.result-preview {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--checker-light);
    background-image:
        linear-gradient(45deg, var(--checker-dark) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-dark) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-dark) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-dark) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.result-summary {
    flex: 1;
    min-width: 0;
}

.format-badge-large {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    background: var(--primary);
    color: white;
}

/* Format-specific colors */
.format-jpeg { background: #e64e4e; }
.format-png { background: #339966; }
.format-gif { background: #9b59b6; }
.format-webp { background: #3399cc; }
.format-heic { background: #e67e22; }
.format-avif { background: #2ecc71; }
.format-tiff { background: #8e44ad; }
.format-bmp { background: #95a5a6; }
.format-svg { background: #f39c12; }
.format-ico { background: #e64e4e; }
.format-jxl { background: #1abc9c; }
.format-unknown { background: var(--text-muted); }

.result-filename {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 0 0.75rem;
    color: var(--text);
    word-break: break-all;
}

.quick-stats {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.quick-stat {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.quick-stat svg, .quick-stat i { color: var(--primary); }

/* Info Panels Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

.info-panel {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border);
}

.info-panel-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 1rem;
}

.info-panel-title svg, .info-panel-title i { color: var(--primary); }

.info-rows {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

.info-row:last-child { border-bottom: none; }

.info-label {
    color: var(--text-muted);
    font-weight: 500;
    flex-shrink: 0;
    min-width: 120px;
}

.info-value {
    color: var(--text);
    font-weight: 500;
    text-align: right;
    word-break: break-all;
}

.info-row.warning .info-value {
    color: var(--warning);
    font-weight: 600;
}

.panel-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: 0.75rem;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
}

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

/* Magic Bytes Panel */
.magic-bytes-panel {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border);
    margin-bottom: 1.25rem;
}

.magic-bytes-display {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.hex-display {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.9rem;
    background: var(--bg-elevated);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    color: var(--primary);
    letter-spacing: 0.5px;
    font-weight: 600;
}

.magic-bytes-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Converters Panel */
.converters-panel {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.converter-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.converter-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.converter-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Result Actions */
.result-actions {
    display: flex;
    justify-content: center;
    padding-top: 0.5rem;
}

/* Loading */
.loading-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    gap: 1rem;
}

.loading-spinner {
    width: 48px; height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-text {
    font-size: 1rem;
    color: var(--text-muted);
    margin: 0;
}

/* Tool Buttons */
.tool-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    border: none;
}

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

.tool-btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary-hover);
}

/* Error */
.error-message {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1.25rem;
    font-weight: 500;
}

/* Related Tools */
.related-tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
}

.related-label svg, .related-label i { color: var(--primary); }

.related-links { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.related-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Info Sections (How-to, Features, FAQ) */
.info-sections { display: flex; flex-direction: column; gap: 1.5rem; }

.info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    color: var(--text);
    margin: 0 0 1.5rem;
}

.info-card h2 svg, .info-card h2 i { color: var(--primary); }

/* Steps List */
.steps-list { counter-reset: step; list-style: none; padding: 0; margin: 0; }

.steps-list li {
    position: relative;
    padding-left: 3.25rem;
    margin-bottom: 1rem;
    counter-increment: step;
    color: var(--text-secondary);
    line-height: 1.6;
}

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2rem; bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0; top: 0;
    width: 2rem; height: 2rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex; align-items: center; justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    z-index: 1;
}

.steps-list li:last-child { margin-bottom: 0; }
.steps-list li a { color: var(--primary); text-decoration: none; }
.steps-list li a:hover { text-decoration: underline; }

/* Features Grid */
.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

.feature-item { display: flex; gap: 1rem; align-items: flex-start; }

.feature-icon {
    width: 40px; height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.feature-content h4 { margin: 0 0 0.25rem; font-size: 1rem; color: var(--text); }

.feature-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.feature-content a { color: var(--primary); text-decoration: none; }
.feature-content a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 768px) {
    .tool-container { padding: 1rem; }
    .tool-icon-wrapper { width: 50px; height: 50px; }
    .upload-section { padding: 2rem 1.5rem; }
    .upload-area { padding: 2.5rem 1.5rem; }
    .results-section { padding: 1.25rem; }

    .result-hero {
        flex-direction: column;
        text-align: center;
    }

    .result-preview { width: 140px; height: 140px; }

    .quick-stats { justify-content: center; }

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

    .info-row {
        flex-direction: column;
        gap: 0.25rem;
    }

    .info-value { text-align: left; }

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

    .related-tools {
        flex-direction: column;
        align-items: flex-start;
    }

    .tool-btn { width: 100%; }

    .info-card { padding: 1.5rem; }
}

@media (max-width: 480px) {
    .tool-title-row {
        flex-direction: column;
        gap: 0.75rem;
    }

    .hex-display { font-size: 0.75rem; word-break: break-all; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

::selection { background: rgba(51, 153, 204, 0.2); color: var(--text); }
[data-theme="dark"] ::selection { background: rgba(56, 189, 248, 0.3); }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}