:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --tech-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --crypto-gradient: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
    --accent-color: #00f2fe;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --border-color: rgba(255, 255, 255, 0.1);
    --navbar-bg: rgba(10, 10, 10, 0.9);
    --navbar-bg-scrolled: rgba(10, 10, 10, 0.95);
    --dropdown-bg: rgba(10, 10, 10, 0.95);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --card-bg: rgba(0, 0, 0, 0.05);
    --text-primary: #1a1a1a;
    --text-secondary: rgba(0, 0, 0, 0.7);
    --border-color: rgba(0, 0, 0, 0.1);
    --navbar-bg: rgba(255, 255, 255, 0.9);
    --navbar-bg-scrolled: rgba(255, 255, 255, 0.95);
    --dropdown-bg: rgba(255, 255, 255, 0.95);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    padding-top: 80px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Animated background */
.bg-animation {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 20% 80%, rgba(255, 107, 107, 0.2) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(254, 202, 87, 0.2) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
}

/* Modern Navigation */
.navbar-modern {
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.navbar-brand-modern {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--tech-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
}

.brand-icon img {
    width: 100%;
    height: 100%;
    display: block;
}

.navbar-nav-modern {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-dropdown {
    position: relative;
}

.nav-link-modern {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.nav-link-modern:hover {
    color: var(--accent-color);
    background: rgba(79, 172, 254, 0.1);
}

.dropdown-menu-modern {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--dropdown-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.5rem 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
    margin: 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.nav-dropdown:hover .dropdown-menu-modern {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item-modern {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
}

.dropdown-item-modern:hover {
    color: var(--text-primary);
    background: rgba(79, 172, 254, 0.1);
}

.dropdown-divider-modern {
    height: 1px;
    background: var(--border-color);
    border: none;
    margin: 0.5rem 0;
}

.theme-toggle {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    background: rgba(79, 172, 254, 0.1);
    border-color: var(--accent-color);
}

.theme-toggle i {
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.theme-toggle:hover i {
    color: var(--accent-color);
}

/* Page Header */
.page-header {
    padding: 4rem 0 2rem;
    text-align: center;
}

.tool-icon-large {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    background: var(--series-gradient, var(--crypto-gradient));
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 20px 40px rgba(255, 107, 107, 0.3);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.page-title {
    font-size: clamp(1.75rem, 5vw, 3rem);
    font-weight: 800;
    background: var(--series-gradient, var(--crypto-gradient));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.feature-badges {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.badge-modern {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.badge-modern:hover {
    background: rgba(255, 107, 107, 0.1);
    border-color: #ff6b6b;
    transform: translateY(-2px);
}

.badge-modern i {
    color: #ff6b6b;
}

/* Tool Container */
.tool-container {
    padding: 3rem 0;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(20px);
    position: relative;
    overflow: visible;
    width: 100%;
    box-sizing: border-box;
}

/* Workspace panels: no hover lift (interferes with clicking radios/inputs) */
.tool-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(20px);
    position: relative;
    width: 100%;
    box-sizing: border-box;
}

.form-control-modern {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.form-control-modern:focus {
    background: var(--card-bg);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(79, 172, 254, 0.25);
    color: var(--text-primary);
    outline: none;
}

.form-control-modern::placeholder {
    color: var(--text-secondary);
}

/* Specific styles for textarea */
textarea.form-control-modern {
    resize: vertical;
    min-height: 120px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
}

.btn-modern {
    background: var(--series-gradient, var(--crypto-gradient));
    border: none;
    padding: 12px 30px;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-modern:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 107, 107, 0.4);
    color: white;
}

.btn-modern:hover::before {
    left: 100%;
}

.btn-modern:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.btn-modern:disabled:hover {
    transform: none;
    box-shadow: none;
}

.result-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
    width: 100%;
    box-sizing: border-box;
}

.hash-output {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    word-break: break-all;
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 100%;
    box-sizing: border-box;
}

.alert-modern {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.5rem;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

@media (max-width: 768px) {
    .tool-panel,
    .tool-card {
        padding: 1.25rem;
    }

    .tool-icon-large {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
    
    .feature-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .badge-modern {
        width: fit-content;
    }
}

.tool-error{color:#ef4444;font-size:.9rem;margin-top:.5rem;display:none}
.tool-error.show{display:block}
.algo-row,.mode-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1rem}
.algo-row label,.mode-row label{display:inline-flex;align-items:center;gap:.35rem;padding:.4rem .75rem;border-radius:8px;border:1px solid var(--border-color);cursor:pointer;font-size:.9rem;background:var(--card-bg)}
.algo-row input,.mode-row input{accent-color:var(--accent-color)}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1rem}
.btn-row .btn-modern{flex:1;min-width:8rem}
.btn-secondary-modern{background:transparent;border:1px solid var(--border-color);color:var(--text-primary)}
.btn-secondary-modern:hover{border-color:var(--accent-color);color:var(--accent-color)}
.privacy-note{font-size:.85rem;color:var(--text-secondary);margin-top:1rem}
.related-tools{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center;margin-top:1.5rem;font-size:.9rem}
.related-tools a{color:var(--accent-color);text-decoration:none}
.file-name{font-size:.85rem;color:var(--text-secondary);margin-top:.35rem}
.strength-wrap{margin-top:1rem}
.strength-bar{height:8px;border-radius:999px;background:var(--border-color);overflow:hidden}
.strength-bar>i{display:block;height:100%;width:0;background:#ef4444;transition:width .2s ease,background .2s ease}
.strength-bar[data-label="weak"]>i{background:#f59e0b}
.strength-bar[data-label="fair"]>i{background:#eab308}
.strength-bar[data-label="strong"]>i{background:#22c55e}
.strength-meta{display:flex;justify-content:space-between;gap:1rem;margin-top:.45rem;font-size:.9rem;color:var(--text-secondary);text-transform:capitalize}
.strength-tips{margin:.5rem 0 0;padding-left:1.1rem;color:var(--text-secondary);font-size:.85rem}
.hash-list{display:grid;gap:.75rem}
.diff-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.diff-grid textarea{min-height:12rem}
.diff-out{display:grid;grid-template-columns:1fr 1fr;gap:.35rem 1rem;font-family:ui-monospace,monospace;font-size:.85rem;line-height:1.45}
.diff-out span{display:block;padding:.1rem .35rem;border-radius:4px;white-space:pre-wrap;word-break:break-all}
.diff-out .eq{color:var(--text-secondary)}
.diff-out .del{background:rgba(239,68,68,.18)}
.diff-out .add{background:rgba(34,197,94,.18)}
.md-preview{min-height:12rem;padding:1rem;border:1px solid var(--border-color);border-radius:12px;background:var(--card-bg)}
.md-preview>*:first-child{margin-top:0}
.md-preview pre{overflow:auto}
.md-paper{background:#fff;color:#1a1a1a;min-height:16rem;max-height:32rem;padding:1.25rem 1.5rem;border-radius:12px;border:1px solid var(--border-color);overflow:auto}
.md-paper>*:first-child{margin-top:0}
.md-paper h1,.md-paper h2,.md-paper h3,.md-paper h4{color:#111;margin:1em 0 .4em}
.md-paper p,.md-paper li{line-height:1.55}
.md-paper a{color:#1d4ed8}
.md-paper pre{background:#f4f4f5;padding:.75rem;border-radius:8px;overflow:auto}
.md-paper code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}
.md-paper blockquote{border-left:3px solid #cbd5e1;margin:0;padding:.15rem 0 .15rem .85rem;color:#52525b}
.md-paper table{border-collapse:collapse;width:100%;margin:.75rem 0}
.md-paper th,.md-paper td{border:1px solid #e4e4e7;padding:.35rem .5rem;text-align:left}
.md-paper hr{border:0;border-top:1px solid #d4d4d8;margin:1rem 0}
.hash-list dt{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--text-secondary);margin:0 0 .2rem}
.hash-list dd{margin:0;word-break:break-all}
.lookup-split{display:grid;grid-template-columns:1fr 1fr;gap:0 1.75rem;align-items:start}
.lookup-table{width:100%;border-collapse:collapse;font-size:.9rem}
.lookup-table th,.lookup-table td{padding:.5rem .65rem;border-bottom:1px solid var(--border-color);text-align:left;vertical-align:top}
.lookup-table tr.is-hidden{display:none}
@media (max-width:768px){
  .diff-grid,.diff-out,.lookup-split{grid-template-columns:1fr}
}
.swatch{width:4.5rem;height:4.5rem;border-radius:12px;border:1px solid var(--border-color);flex-shrink:0}
.color-row{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.re-hl{white-space:pre-wrap;word-break:break-all;font-family:ui-monospace,monospace;font-size:.9rem;line-height:1.65;padding:1rem;border-radius:8px;background:var(--bg-secondary);border:1px solid var(--border-color)}
.re-hl mark{background:rgba(250,204,21,.4);color:inherit;padding:0 .12em;border-radius:2px}
.preview-img{max-width:100%;max-height:16rem;border-radius:8px;margin-top:.75rem;display:block}
.img-compare{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.img-compare img,.img-stage img,.img-stage canvas{max-width:100%;height:auto;display:block;border-radius:8px;background:repeating-conic-gradient(#80808022 0 25%,#0000 0 50%) 0 0/12px 12px}
.img-meta{font-size:.85rem;color:var(--text-secondary);margin-top:.35rem}
.img-stage{position:relative;display:inline-block;max-width:100%;line-height:0;touch-action:none;overflow:hidden;border-radius:8px}
.crop-box{position:absolute;border:2px solid var(--accent-color);box-shadow:0 0 0 9999px rgba(0,0,0,.45);pointer-events:none}
.field-row{display:flex;flex-wrap:wrap;gap:.75rem;margin:0 0 1rem}
.field-row label{display:flex;flex-direction:column;gap:.25rem;font-size:.85rem;color:var(--text-secondary)}
.field-row .form-control-modern{width:7.5rem;padding:.45rem .65rem}
.swatch-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.75rem}
.swatch-chip{width:3.25rem;height:3.25rem;border-radius:8px;border:1px solid var(--border-color);cursor:pointer}
.grid-out{display:grid;gap:.35rem;margin-top:.75rem}
.grid-out img{width:100%;display:block;border-radius:4px}
.qr-video{width:100%;max-height:16rem;border-radius:8px;background:#000;display:none}
.mark-stage canvas{max-width:100%;height:auto;display:block;touch-action:none;cursor:crosshair;border-radius:8px;background:repeating-conic-gradient(#80808022 0 25%,#0000 0 50%) 0 0/12px 12px}
.barcode-preview{background:#fff;border-radius:12px;padding:1rem;display:inline-block;max-width:100%}
.barcode-preview canvas{max-width:100%;height:auto;display:block}
.pay-split{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:768px){.img-compare,.pay-split{grid-template-columns:1fr}}