:root {
    --bg-main: #f8fafc;
    --panel-bg: #ffffff;
    --panel-header: #f1f5f9;
    --border-color: #e2e8f0;
    --editor-bg: #ffffff;
    --gutter-bg: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --line-number: #94a3b8;
    --accent-green: #059669;
    --accent-blue: #2563eb;
    --accent-amber: #b45309;
    --transition-speed: 0.3s;
    --font-mono: 'JetBrains Mono', monospace;
}

body.dark-mode {
    --bg-main: #0a0e17;
    --panel-bg: #121826;
    --panel-header: rgba(255, 255, 255, 0.02);
    --border-color: #1f2937;
    --editor-bg: #080c14;
    --gutter-bg: #0d111a;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --line-number: #374151;
    --accent-green: #10b981;
    --accent-blue: #3b82f6;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.05) 0px, transparent 50%);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    padding: 40px 0;
    overflow-x: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    
    /* Security: Prevent text selection on UI elements */
    user-select: none;
    -webkit-user-select: none;
}

/* Allow selection in input areas only */
textarea, input, .editor-wrapper, .log-area {
    user-select: text !important;
    -webkit-user-select: text !important;
}

.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styling */
.app-header {
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.app-header h1 {
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--accent-blue);
}

/* Card / Panel Styling */
.glass-panel {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
    overflow: hidden;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.panel-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--panel-header);
}

/* Editor Styling */
.editor-wrapper {
    position: relative;
    display: flex;
    background: var(--editor-bg);
}

.line-numbers {
    width: 45px;
    padding: 15px 0;
    text-align: center;
    color: var(--line-number);
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--gutter-bg);
    user-select: none;
    border-right: 1px solid var(--border-color);
    overflow: hidden;
}

/* Loading Overlay Styles */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content h4 {
    color: var(--text-main);
    letter-spacing: 1px;
}

textarea {
    width: 100%;
    height: 450px;
    background: transparent;
    color: var(--text-main);
    border: none;
    padding: 15px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
    white-space: pre;
    overflow: auto;
}

textarea::placeholder {
    color: #4b5563;
}

/* Buttons Styling */
.btn-action {
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: none;
}

.btn-convert {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-convert:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-push {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-push:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* Status & Stats */
.stat-badge {
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-success { background: rgba(16, 185, 129, 0.1); color: var(--accent-green); border: 1px solid rgba(16, 185, 129, 0.2); }
.stat-fail { background: rgba(239, 68, 68, 0.1); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.2); }

.log-area {
    margin-top: 2rem;
    max-height: 200px;
    overflow-y: auto;
    border-radius: 12px;
    background: #080c14;
    border: 1px solid var(--border-color);
}

.log-item {
    padding: 8px 16px;
    border-bottom: 1px solid #1f2937;
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
}

.log-item:last-child { border-bottom: none; }
.log-error { color: #ef4444; border-left: 3px solid #ef4444; background: rgba(239,68,68,0.03); }
.log-success { color: var(--accent-green); border-left: 3px solid var(--accent-green); }

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: #1f2937; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #374151; }

.push-indicator {
    padding: 15px;
    border-radius: 12px;
    margin-top: 15px;
    font-weight: 500;
    text-align: center;
    display: none;
}

@media (max-width: 991px) {
    .actions-column {
        margin: 20px 0;
        display: flex;
        gap: 15px;
        justify-content: center;
    }
}