:root {
    --bg-dark: #1A150A;
    --surface: #262115;
    --surface-hover: #332D1D;
    --border: #4A4027;
    
    --primary: #F39C12;
    --primary-hover: #D68910;
    --secondary: #FFEAA7;
    --accent: #00CEC9;
    
    --text-main: #FDFEFE;
    --text-muted: #A6ACAF;
    --text-dim: #797D7F;
    
    --radius-lg: 12px;
    --radius-md: 8px;
    --radius-sm: 4px;
    
    --transition: 250ms ease;
    
    color-scheme: dark;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Utilities */
.flex-grow { flex-grow: 1; }
.span-full { grid-column: 1 / -1; }

/* Header */
.app-header {
    height: 64px;
    background: rgba(38, 33, 21, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    flex-shrink: 0;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.logo span {
    font-weight: 400;
    color: var(--secondary);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

/* Layout */
.app-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: radial-gradient(circle at 100% 0%, rgba(243, 156, 18, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 0% 100%, rgba(0, 206, 201, 0.05) 0%, transparent 40%);
}

/* Sidebar Input */
.sidebar {
    width: 380px;
    min-width: 300px;
    background: rgba(26, 21, 10, 0.6);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
    z-index: 5;
    backdrop-filter: blur(8px);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--secondary);
    letter-spacing: 0.02em;
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.version-input-wrap {
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition);
}

.version-input-wrap:focus-within {
    border-color: var(--primary);
}

.v-prefix {
    padding: 0.75rem 0 0.75rem 1rem;
    color: var(--text-muted);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    user-select: none;
}

input[type="text"] {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.75rem;
    color: var(--text-main);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    outline: none;
}

textarea {
    width: 100%;
    height: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    color: var(--text-main);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    transition: var(--transition);
}

textarea:focus {
    border-color: var(--primary);
}
textarea::placeholder {
    color: var(--text-dim);
}

/* Main Workspace */
.workspace {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.results-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.card {
    background: rgba(38, 33, 21, 0.4);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    border-color: rgba(243, 156, 18, 0.3);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: rgba(0,0,0,0.2);
}

.card-header h2 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

/* Badge */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Fira Code', monospace;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.badge.patch { background: rgba(0, 206, 201, 0.15); color: var(--accent); border: 1px solid rgba(0, 206, 201, 0.3); }
.badge.minor { background: rgba(255, 234, 167, 0.15); color: var(--secondary); border: 1px solid rgba(255, 234, 167, 0.3); }
.badge.major { background: rgba(243, 156, 18, 0.15); color: var(--primary); border: 1px solid rgba(243, 156, 18, 0.3); }

/* Bump Preview */
.bump-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2.5rem 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 700;
}

.version-old { color: var(--text-muted); }
.version-new { color: var(--primary); }
.icon-arrow { color: var(--text-dim); }

/* Stats */
.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--border);
    background: rgba(0,0,0,0.1);
}

.stat {
    padding: 1rem 0.5rem;
    text-align: center;
    border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }

.stat-val {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}
.stat-lbl {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Output Areas */
.code-area, .markdown-area {
    width: 100%;
    background: transparent;
    border: none;
    padding: 1.25rem;
    color: var(--secondary);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    flex-grow: 1;
    min-height: 120px;
}
.markdown-area {
    min-height: 300px;
    color: var(--text-main);
}

/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}
.btn-outline {
    background: transparent;
    color: var(--text-main);
    border-color: var(--border);
}
.btn-outline:hover {
    background: var(--surface-hover);
    border-color: var(--text-muted);
}
.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn-icon:hover {
    color: var(--primary);
    background: rgba(243, 156, 18, 0.1);
}

/* Toast */
.toast {
    position: fixed;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #000;
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: bottom 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 206, 201, 0.3);
}
.toast.show {
    bottom: 2rem;
}

/* Responsive */
@media (max-width: 900px) {
    .app-layout { flex-direction: column; }
    .sidebar { width: 100%; height: 300px; border-right: none; border-bottom: 1px solid var(--border); }
    .results-grid { grid-template-columns: 1fr; }
}