/* ========================================================================
IMAGE CONVERTER & COMPRESSOR — TOOLHUB DESIGN SYSTEM
Target: RO / DACH / EN | Psychological: Trust + Clarity + Micro-reward
======================================================================== */

/* 1. VARIABLES & THEME =================================================== */
:root {
/* Colors */
--bg-page: #F8FAFC;
--bg-card: #FFFFFF;
--bg-surface: #F1F5F9;
--text-primary: #0F172A;
--text-secondary: #475569;
--text-muted: #94A3B8;
--accent: #2563EB;
--accent-hover: #1D4ED8;
--accent-light: #DBEAFE;
--warm: #D97706;
--success: #10B981;
--success-bg: #D1FAE5;
--error: #EF4444;
--error-bg: #FEE2E2;
--warning: #F59E0B;
--warning-bg: #FEF3C7;
--border: #E2E8F0;
--shadow-sm: 0 1px 3px rgba(15,23,42,0.08);
--shadow-md: 0 4px 12px rgba(15,23,42,0.12);
--focus-ring: 0 0 0 3px rgba(37,99,235,0.25);
/* Spacing */
--space-xs: 0.25rem;
--space-sm: 0.5rem;
--space-md: 1rem;
--space-lg: 1.5rem;
--space-xl: 2rem;
--space-2xl: 3rem;
/* Layout */
--radius: 12px;
--radius-sm: 8px;
--radius-xs: 4px;
--max-width: 1200px;
--header-height: 64px;
--footer-height: 90px;
/* Typography */
--font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
--font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", ui-monospace, monospace;
--text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
--text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.9375rem);
--text-base: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
--text-lg: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
--text-xl: clamp(1.25rem, 1rem + 1vw, 1.5rem);
--text-2xl: clamp(1.5rem, 1.2rem + 1.2vw, 1.875rem);
--text-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.25rem);
/* Motion */
--ease: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
--ease-slow: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
:root {
--bg-page: #0B1120;
--bg-card: #111827;
--bg-surface: #1E293B;
--text-primary: #F1F5F9;
--text-secondary: #CBD5E1;
--text-muted: #64748B;
--accent-light: #1E3A5F;
--border: #334155;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
--shadow-md: 0 4px 12px rgba(0,0,0,0.4);
--success-bg: #064E3B;
--error-bg: #7F1D1D;
--warning-bg: #78350F;
}
}

html.theme-dark {
--bg-page: #0B1120;
--bg-card: #111827;
--bg-surface: #1E293B;
--text-primary: #F1F5F9;
--text-secondary: #CBD5E1;
--text-muted: #64748B;
--accent-light: #1E3A5F;
--border: #334155;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
--shadow-md: 0 4px 12px rgba(0,0,0,0.4);
--success-bg: #064E3B;
--error-bg: #7F1D1D;
--warning-bg: #78350F;
}

html.theme-light {
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-surface: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --accent-light: #DBEAFE;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(15,23,42,0.08);
    --shadow-md: 0 4px 12px rgba(15,23,42,0.12);
    --success-bg: #D1FAE5;
    --error-bg: #FEE2E2;
    --warning-bg: #FEF3C7;
}

/* 2. BASE & RESET ======================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
scroll-behavior: smooth;
-webkit-text-size-adjust: 100%;
text-rendering: optimizeLegibility;
font-feature-settings: "kern" 1, "liga" 1;
}
body {
font-family: var(--font-sans);
background: var(--bg-page);
color: var(--text-primary);
line-height: 1.5;
-webkit-font-smoothing: antialiased;
min-height: 100vh;
display: flex;
flex-direction: column;
padding-bottom: var(--footer-height, 90px);
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }
ul, ol { list-style: none; }

/* 3. LAYOUT & CONTAINERS ================================================ */
.container {
width: 100%;
max-width: var(--max-width);
margin: 0 auto;
padding-inline: var(--space-lg);
}
.site-header {
position: sticky;
top: 0;
z-index: 50;
height: var(--header-height);
background: var(--bg-card);
border-bottom: 1px solid var(--border);
display: flex;
align-items: center;
}
.site-header .container {
display: flex;
align-items: center;
justify-content: space-between;
height: 100%;
}
.logo {
display: inline-flex;
align-items: center;
gap: var(--space-sm);
color: var(--text-primary);
font-size: var(--text-lg);
line-height: 1.2;
transition: opacity var(--ease);
}
.logo:hover { opacity: 0.9; }
.logo-img {
width: 32px;
height: 32px;
flex-shrink: 0;
display: block;
border-radius: var(--radius-sm);
}
.logo strong {
font-weight: 700;
letter-spacing: -0.02em;
}
main { flex: 1; padding-block: var(--space-2xl); }
footer {
border-top: 1px solid var(--border);
padding-block: var(--space-xl);
color: var(--text-muted);
font-size: var(--text-sm);
}

/* 4. TYPOGRAPHY & UTILITY =============================================== */
h1, h2, h3, h4 {
text-wrap: balance;
line-height: 1.2;
font-weight: 600;
}
h1 { font-size: var(--text-3xl); margin-bottom: var(--space-md); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-lg); }
h3 { font-size: var(--text-xl); }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.sr-only {
position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* 5. COMPONENTS ========================================================= */
/* Language Switcher */
.lang-switch {
display: inline-flex;
background: var(--bg-surface);
padding: 4px;
border-radius: 999px;
gap: 4px;
align-items: center;
width: auto;
}
.lang-btn {
display: inline-flex;
align-items: center;
gap: 6px;
padding: 6px 12px;
border-radius: 999px;
font-size: var(--text-sm);
font-weight: 500;
color: var(--text-secondary);
background: transparent;
border: 1px solid transparent;
transition: all 0.2s ease;
white-space: nowrap;
text-decoration: none;
}
.lang-btn:hover { color: var(--text-primary); }
.lang-btn.active {
background: var(--bg-card);
color: var(--accent);
font-weight: 600;
box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
border: 1px solid var(--border);
}
.lang-btn:not(.active) {
opacity: .6;
border: 1px solid transparent;
}

/* Theme Toggle */
.theme-toggle {
width: 36px; height: 36px;
border-radius: 50%;
border: 1px solid var(--border);
background: var(--bg-surface);
display: grid; place-items: center;
font-size: 1.1rem;
}
/* Subsite Banner */
.subsite-banner {
position: sticky;
top: var(--header-height);
z-index: 49;
background: var(--accent);
color: #fff;
text-align: center;
padding: 10px 16px;
font-size: var(--text-sm);
font-weight: 600;
letter-spacing: .3px;
}
.subsite-banner a {
color: #fff;
text-decoration: underline;
text-underline-offset: 3px;
font-weight: 700;
}
/* Tool Card */
.tool-card {
background: var(--bg-card);
border: 1px solid var(--border);
border-radius: var(--radius);
padding: var(--space-xl);
box-shadow: var(--shadow-sm);
max-width: 960px;
margin: 0 auto;
}
/* Buttons */
.btn {
display: inline-flex;
align-items: center;
justify-content: center;
gap: var(--space-xs);
padding: var(--space-sm) var(--space-md);
border-radius: var(--radius-sm);
font-size: var(--text-sm);
font-weight: 500;
border: 1px solid transparent;
background: var(--accent);
color: #fff;
transition: var(--ease);
cursor: pointer;
}
.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--outline {
background: transparent;
border-color: var(--border);
color: var(--text-primary);
}
.btn--outline:hover { background: var(--bg-surface); }
.btn--success { background: var(--success); }
.btn--success:hover { background: #059669; }
.btn--danger { background: var(--error); }
.btn--danger:hover { background: #DC2626; }
.btn--sm {
padding: var(--space-xs) var(--space-sm);
font-size: var(--text-xs);
}
/* Forms */
.form-group { margin-bottom: var(--space-md); }
.form-label {
display: block;
font-size: var(--text-sm);
font-weight: 500;
margin-bottom: var(--space-xs);
color: var(--text-primary);
}
.form-input, .form-select {
width: 100%;
padding: var(--space-sm) var(--space-md);
border: 1px solid var(--border);
border-radius: var(--radius-sm);
background: var(--bg-card);
color: var(--text-primary);
font-size: var(--text-base);
transition: var(--ease);
}
.form-select {
appearance: none;
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
background-repeat: no-repeat;
background-position: right 12px center;
padding-right: 36px;
}
.form-input:focus, .form-select:focus {
outline: none;
box-shadow: var(--focus-ring);
border-color: var(--accent);
}
.form-input.is-error { border-color: var(--error); box-shadow: 0 0 0 3px rgba(239,68,68,0.2); }
.form-help { font-size: var(--text-xs); color: var(--text-muted); margin-top: var(--space-xs); }

/* Range slider */
.form-range {
width: 100%;
height: 6px;
background: var(--bg-surface);
border-radius: 3px;
appearance: none;
outline: none;
cursor: pointer;
}
.form-range::-webkit-slider-runnable-track {
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
}
.form-range::-moz-range-track {
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
}
.form-range::-webkit-slider-thumb {
appearance: none;
width: 20px;
height: 20px;
border-radius: 50%;
background: var(--accent);
cursor: pointer;
border: 2px solid var(--bg-card);
box-shadow: var(--shadow-sm);
}
.form-range::-moz-range-thumb {
width: 20px;
height: 20px;
border-radius: 50%;
background: var(--accent);
cursor: pointer;
border: 2px solid var(--bg-card);
}

/* Toggle switch */
.toggle-wrap {
display: inline-flex;
align-items: center;
gap: var(--space-sm);
}
.toggle-input {
position: absolute;
opacity: 0;
width: 0;
height: 0;
}
.toggle-track {
width: 44px;
height: 24px;
background: var(--bg-surface);
border: 1px solid var(--border);
border-radius: 12px;
position: relative;
cursor: pointer;
transition: var(--ease);
}
.toggle-track::after {
content: '';
position: absolute;
top: 2px;
left: 2px;
width: 18px;
height: 18px;
border-radius: 50%;
background: var(--text-muted);
transition: var(--ease);
}
.toggle-input:checked + .toggle-track {
background: var(--accent);
border-color: var(--accent);
}
.toggle-input:checked + .toggle-track::after {
transform: translateX(20px);
background: #fff;
}
.toggle-label {
font-size: var(--text-sm);
color: var(--text-secondary);
cursor: pointer;
}

/* 6. TOOL-SPECIFIC — Image Converter ==================================== */

/* Drop zone */
.drop-zone {
border: 2px dashed var(--border);
border-radius: var(--radius);
padding: var(--space-2xl);
text-align: center;
cursor: pointer;
transition: var(--ease);
background: var(--bg-surface);
position: relative;
min-height: 200px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
gap: var(--space-md);
}
.drop-zone:hover,
.drop-zone.is-dragover {
border-color: var(--accent);
background: var(--accent-light);
}
.drop-zone-icon {
font-size: 3rem;
line-height: 1;
opacity: 0.7;
}
.drop-zone-text {
font-size: var(--text-lg);
color: var(--text-secondary);
}
.drop-zone-hint {
font-size: var(--text-sm);
color: var(--text-muted);
}
.drop-zone input[type="file"] {
position: absolute;
inset: 0;
opacity: 0;
cursor: pointer;
}

/* Preview area */
.preview-area {
display: grid;
grid-template-columns: 1fr 1fr;
gap: var(--space-lg);
margin-top: var(--space-lg);
}
.preview-box {
background: var(--bg-surface);
border: 1px solid var(--border);
border-radius: var(--radius-sm);
padding: var(--space-md);
display: flex;
flex-direction: column;
align-items: center;
gap: var(--space-sm);
min-height: 180px;
}
.preview-box img,
.preview-box canvas {
max-width: 100%;
max-height: 280px;
object-fit: contain;
border-radius: var(--radius-xs);
}
.preview-label {
font-size: var(--text-sm);
font-weight: 600;
color: var(--text-primary);
}
.preview-meta {
font-size: var(--text-xs);
color: var(--text-muted);
text-align: center;
}

/* Settings grid */
.settings-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: var(--space-md);
margin-top: var(--space-lg);
}
.settings-section {
background: var(--bg-surface);
border: 1px solid var(--border);
border-radius: var(--radius-sm);
padding: var(--space-md);
}
.settings-section-title {
font-size: var(--text-sm);
font-weight: 600;
color: var(--text-primary);
margin-bottom: var(--space-sm);
display: flex;
align-items: center;
gap: var(--space-xs);
}
.size-inputs {
display: flex;
align-items: center;
gap: var(--space-sm);
}
.size-inputs .form-input {
width: 80px;
text-align: center;
}
.size-inputs .size-link {
color: var(--accent);
cursor: pointer;
font-size: var(--text-lg);
padding: var(--space-xs);
border: 1px solid var(--border);
border-radius: var(--radius-xs);
background: var(--bg-card);
line-height: 1;
transition: var(--ease);
}
.size-inputs .size-link.is-unlinked {
color: var(--text-muted);
background: var(--bg-surface);
}
.quality-display {
display: inline-block;
min-width: 36px;
text-align: center;
font-weight: 600;
color: var(--accent);
font-size: var(--text-sm);
}

/* Result / download area */
.result-area {
margin-top: var(--space-lg);
background: var(--bg-surface);
border: 1px solid var(--border);
border-radius: var(--radius-sm);
padding: var(--space-lg);
display: none;
}
.result-area.is-visible { display: block; }
.result-stats {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
gap: var(--space-md);
margin-bottom: var(--space-md);
}
.stat-box {
text-align: center;
padding: var(--space-sm);
}
.stat-value {
font-size: var(--text-xl);
font-weight: 700;
color: var(--text-primary);
font-family: var(--font-mono);
}
.stat-value.is-smaller { color: var(--success); }
.stat-value.is-larger { color: var(--error); }
.stat-label {
font-size: var(--text-xs);
color: var(--text-muted);
margin-top: 2px;
}
.result-actions {
display: flex;
gap: var(--space-sm);
flex-wrap: wrap;
justify-content: center;
}

/* Comparison bar */
.comparison-bar {
height: 8px;
border-radius: 4px;
background: var(--bg-surface);
overflow: hidden;
margin: var(--space-sm) 0;
position: relative;
}
.comparison-fill {
height: 100%;
border-radius: 4px;
transition: width 0.5s ease;
}
.comparison-fill.is-smaller { background: var(--success); }
.comparison-fill.is-larger { background: var(--error); }

/* ── Tab Bar ── */
.tab-bar {
display: flex;
gap: var(--space-xs);
border-bottom: 2px solid var(--border);
margin-bottom: var(--space-lg);
}
.tab-btn {
padding: var(--space-sm) var(--space-lg);
background: transparent;
border: none;
border-bottom: 3px solid transparent;
color: var(--text-secondary);
font-size: var(--text-base);
font-weight: 500;
cursor: pointer;
transition: var(--ease);
margin-bottom: -2px;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.is-active {
color: var(--accent);
border-bottom-color: var(--accent);
font-weight: 600;
}
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

/* ── Video Progress ── */
.vid-progress-bar {
height: 10px;
background: var(--bg-surface);
border-radius: 5px;
overflow: hidden;
}
.vid-progress-fill {
height: 100%;
background: var(--accent);
border-radius: 5px;
width: 0%;
transition: width 0.3s ease;
}

/* 7. STICKY DONATE ====================================================== */
.sticky-donate-wrapper {
position: fixed;
bottom: 44px;
right: 24px;
z-index: 90;
display: flex;
flex-direction: column;
align-items: flex-end;
gap: 8px;
opacity: 0;
transform: translateY(20px);
transition: opacity var(--ease), transform var(--ease);
pointer-events: none;
}
.sticky-donate-wrapper.is-visible {
opacity: 1;
transform: translateY(0);
pointer-events: auto;
}
.sticky-donate-btn {
display: inline-flex;
align-items: center;
gap: 8px;
padding: 10px 16px;
background: #FFDD00;
color: #111;
font-weight: 600;
font-size: var(--text-sm);
border-radius: 999px;
box-shadow: var(--shadow-md);
border: none;
text-decoration: none;
transition: transform var(--ease), box-shadow var(--ease);
}
.sticky-donate-btn:hover {
transform: translateY(-2px) scale(1.02);
box-shadow: 0 8px 16px rgba(255, 205, 0, 0.3);
}
.sticky-donate-btn:focus-visible {
outline: none;
box-shadow: var(--focus-ring);
}
.donate-icon { font-size: 1.2em; }

/* 8. MODAL ============================================================== */
.modal-overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
display: flex;
align-items: center;
justify-content: center;
z-index: 10000;
opacity: 0;
visibility: hidden;
transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.is-active {
opacity: 1;
visibility: visible;
}
.modal-container {
background: var(--bg-card);
border-radius: var(--radius);
box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
max-width: 90vw;
max-height: 90vh;
overflow: hidden;
display: flex;
flex-direction: column;
position: relative;
}
.modal-close {
position: absolute;
top: var(--space-md);
right: var(--space-md);
background: none;
border: none;
font-size: 1.5rem;
cursor: pointer;
color: var(--text-muted);
z-index: 1;
width: 32px;
height: 32px;
display: flex;
align-items: center;
justify-content: center;
border-radius: 50%;
transition: background 0.2s ease;
}
.modal-close:hover {
background: var(--bg-surface);
color: var(--text-primary);
}
.modal-content {
padding: var(--space-2xl);
overflow-y: auto;
max-height: 80vh;
}
.modal-loading {
text-align: center;
padding: var(--space-2xl);
color: var(--text-muted);
}
/* Legal footer */
.subsite-legal-footer {
position: fixed;
bottom: 0;
left: 0;
right: 0;
background: var(--bg-card);
border-top: 1px solid var(--border);
padding: 8px 16px;
z-index: 9998;
text-align: center;
font-size: var(--text-sm);
}
.subsite-legal-footer a {
color: var(--accent);
text-decoration: none;
font-weight: 600;
}
.subsite-legal-footer a span {
text-decoration: underline;
text-underline-offset: 2px;
}

/* 9. ANIMATIONS ========================================================= */
@keyframes pulse {
0%, 100% { transform: scale(1); }
50% { transform: scale(1.15); }
}
@keyframes fadeIn {
from { opacity: 0; transform: translateY(8px); }
to { opacity: 1; transform: translateY(0); }
}
@keyframes spin {
to { transform: rotate(360deg); }
}
.fade-in { animation: fadeIn 0.3s ease forwards; }
.spinner {
width: 24px;
height: 24px;
border: 3px solid var(--border);
border-top-color: var(--accent);
border-radius: 50%;
animation: spin 0.6s linear infinite;
display: inline-block;
}

/* 10. RESPONSIVE ======================================================== */
@media (max-width: 640px) {
:root {
--space-xl: 1.5rem;
--space-2xl: 2rem;
}
.tool-card { padding: var(--space-md); }
.preview-area {
grid-template-columns: 1fr;
}
.settings-grid {
grid-template-columns: 1fr;
}
.lang-btn span { display: none; }
.lang-btn { padding: 6px 8px; font-size: 1.2rem; }
.sticky-donate-wrapper { bottom: 40px; right: 16px; }
.sticky-donate-btn { padding: 8px 14px; font-size: var(--text-xs); }
.result-stats { grid-template-columns: 1fr 1fr; }
}

/* 11. REDUCED MOTION ==================================================== */
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after {
animation-duration: 0.01ms !important;
transition-duration: 0.01ms !important;
}
}

/* 12. PRINT ============================================================= */
@media print {
.site-header, .subsite-banner, .sticky-donate-wrapper, .subsite-legal-footer,
.btn, .theme-toggle, .lang-switch, .tab-bar { display: none !important; }
body { background: #fff; color: #000; padding-bottom: 0; }
.tool-card { box-shadow: none; border: 1px solid #000; break-inside: avoid; }
}