:root {
    --bg-color: #0d0e15;
    --glass-bg: rgba(30, 32, 45, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f0f0f5;
    --text-secondary: #a0a4b8;
    --accent: #6c5ce7;
    --accent-hover: #8172ea;
    --success: #00b894;
    --panel-bg: rgba(15, 16, 22, 0.7);
    --input-bg: rgba(5, 6, 10, 0.5);
    
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic Background Glows */
.background-elements {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out alternate;
}

.orb-1 {
    width: 40vw; height: 40vw;
    background: radial-gradient(circle, rgba(108, 92, 231, 0.3) 0%, rgba(0,0,0,0) 70%);
    top: -10vw; left: -10vw;
}

.orb-2 {
    width: 35vw; height: 35vw;
    background: radial-gradient(circle, rgba(0, 184, 148, 0.2) 0%, rgba(0,0,0,0) 70%);
    bottom: -5vw; right: -10vw;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 30px); }
}

/* Main Container */
.glass-container {
    width: 90%;
    max-width: 1400px;
    height: 90vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Header */
header {
    margin-bottom: 2rem;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-container svg {
    color: var(--accent);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 0%, #a0a4b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* Grid Layout */
.converter-grid {
    display: flex;
    gap: 1.5rem;
    flex: 1;
    min-height: 0; /* Important for deeply nested flexbox scrolling */
}

/* Panels */
.panel {
    flex: 1;
    background: var(--panel-bg);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--glass-border);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 500;
}

textarea {
    flex: 1;
    width: 100%;
    background: var(--input-bg);
    border: none;
    color: var(--text-primary);
    padding: 1.25rem;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.9rem;
    resize: none;
    outline: none;
    line-height: 1.5;
}

textarea::placeholder {
    color: rgba(160, 164, 184, 0.4);
}

/* Input Controls */
.controls {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    gap: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
}

/* Toggle Switch */
.toggle-control {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.toggle-control input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    transition: .3s;
    margin-right: 0.75rem;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    transition: .3s;
}

.toggle-control input:checked + .toggle-slider {
    background-color: var(--accent);
}

.toggle-control input:checked + .toggle-slider:before {
    transform: translateX(20px);
    background-color: #fff;
}

.toggle-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Action Middle Column */
.action-column {
    display: flex;
    align-items: center;
    justify-content: center;
}

.primary-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.primary-btn:active {
    transform: translateY(0);
}

/* Icon Buttons */
.icon-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
    .converter-grid {
        flex-direction: column;
    }
    
    .action-column {
        transform: rotate(90deg);
        padding: 0.5rem 0;
    }
    
    .glass-container {
        height: 95vh;
        width: 95%;
        padding: 1.5rem;
    }
    
    .panel {
        min-height: 250px;
    }
}