:root {
    --bg-color: #0d1117;
    --surface-color: #161b22;
    --surface-border: #30363d;
    --primary-color: #e63946; 
    --primary-hover: #d62828;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --mutated-bg: rgba(230, 57, 70, 0.15);
    --mutated-color: #ffb703;
    --input-bg: #0d1117;
    --row-hover: #21262d;
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition: all 0.2s ease;
}

[data-theme="light"] {
    --bg-color: #f6f8fa;
    --surface-color: #ffffff;
    --surface-border: #d0d7de;
    --primary-color: #d73a49;
    --primary-hover: #cb2431;
    --text-main: #24292e;
    --text-muted: #586069;
    --mutated-bg: rgba(215, 58, 73, 0.1);
    --mutated-color: #d73a49;
    --input-bg: #ffffff;
    --row-hover: #f3f4f6;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--surface-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon { font-size: 1.8rem; }

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Layout Update */
.dashboard-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

@media (max-width: 768px) {
    .dashboard-layout { flex-direction: column; }
    .sidebar-panel { width: 100% !important; }
}

.sidebar-panel {
    width: 250px;
    flex-shrink: 0;
}

.main-panel {
    flex: 1;
    min-width: 0;
}

/* Base UI Elements */
.panel {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.generator-panel { margin-bottom: 1.5rem; }

h3 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mt-4 { margin-top: 1.5rem; }

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    font-size: 0.9rem;
}

.input-wrapper {
    display: flex;
    gap: 0.5rem;
}

input[type="text"], input[type="number"], .styled-select {
    background: var(--input-bg);
    border: 1px solid var(--surface-border);
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    outline: none;
    transition: var(--transition);
}

input[type="text"] { flex: 1; }

input[type="text"]:focus, input[type="number"]:focus, .styled-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--mutated-bg);
}

.styled-select { width: 100%; font-family: var(--font-sans); }
.styled-select option { background: var(--bg-color); }

/* Buttons */
button {
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    border: none;
    border-radius: 6px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
    padding: 0 1.25rem;
    font-size: 0.95rem;
}

.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-main);
    border: 1px solid var(--surface-border);
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
}

.btn-secondary:hover {
    background: var(--row-hover);
    border-color: var(--text-muted);
}

.btn-icon {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    font-size: 1.1rem;
}

.btn-icon:hover { color: var(--text-main); background: var(--row-hover); }
.btn-icon.active { background: var(--row-hover); color: var(--text-main); border-color: var(--surface-border); }

/* Toggles & Presets */
.toggle-group { display: flex; flex-direction: column; gap: 0.5rem; }

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-main);
}

.toggle-label input {
    accent-color: var(--primary-color);
    width: 14px;
    height: 14px;
}

.presets-group { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.btn-preset {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    color: var(--text-muted);
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 4px;
}

.btn-preset:hover {
    background: var(--row-hover);
    color: var(--text-main);
}

/* Results section */
.results-section { transition: var(--transition); }
.results-section.hidden { opacity: 0; pointer-events: none; display: none; }

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    background: var(--row-hover);
    border: 1px solid var(--surface-border);
    padding: 0.1rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

.actions { display: flex; gap: 0.5rem; }

.view-toggles {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--surface-color);
    padding: 0.2rem;
    border-radius: 6px;
    border: 1px solid var(--surface-border);
}

.styled-input { border: none !important; width: 140px; }

/* Grid layout for results */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.75rem;
    max-height: 500px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.payload-card {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    padding: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-family: var(--font-mono);
    position: relative;
    overflow: hidden;
}

.payload-card:hover {
    border-color: var(--text-muted);
    background: var(--row-hover);
}

.payload-content { word-break: break-all; font-size: 0.95rem; }

.mutated-char {
    background: var(--mutated-bg);
    color: var(--mutated-color);
    padding: 0.1rem 0.2rem;
    border-radius: 3px;
}

.copy-indicator {
    font-size: 0.75rem;
    color: var(--primary-color);
    opacity: 0;
    transition: var(--transition);
}

.payload-card:hover .copy-indicator, .table-row:hover .copy-indicator { opacity: 1; }

.payload-card.copied, .table-row.copied {
    border-color: #2ea043;
    background: rgba(46, 160, 67, 0.1);
}

.payload-card.copied .copy-indicator { opacity: 1; color: #2ea043; }

.tag-label {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 0.6rem;
    background: var(--row-hover);
    border: 1px solid var(--surface-border);
    border-top: none;
    border-right: none;
    padding: 0.1rem 0.3rem;
    border-bottom-left-radius: 4px;
    color: var(--text-muted);
}

/* Table View */
.results-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    max-height: 600px;
    overflow-y: auto;
    padding-right: 0.5rem;
    border: 1px solid var(--surface-border);
    border-radius: 6px;
    background: var(--surface-color);
}

.table-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--surface-border);
    cursor: pointer;
}

.table-row:last-child { border-bottom: none; }
.table-row:hover { background: var(--row-hover); }

.table-col { display: flex; flex-direction: column; gap: 0.1rem; }
.col-main { flex: 2; font-family: var(--font-mono); font-size: 0.9rem; word-break: break-all; }
.col-diff { flex: 2; font-family: var(--font-sans); font-size: 0.8rem; color: var(--text-muted); }
.col-meta { flex: 1; text-align: right; font-size: 0.75rem; color: var(--text-muted); display:flex; flex-direction: column; align-items: flex-end; }

.diff-step { display: inline-block; background: var(--row-hover); border: 1px solid var(--surface-border); padding: 0.1rem 0.3rem; border-radius: 3px; margin-bottom: 2px;}
.diff-arrow { color: var(--primary-color); margin: 0 0.2rem; }
.char-orig { opacity: 0.7; }
.char-new { color: var(--mutated-color); font-weight: 600; }

.byte-diff.positive { color: var(--primary-color); } 
.byte-diff.neutral { color: var(--text-muted); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Footer */
.app-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--surface-border);
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}