:root {
    --bg-color: #0b0f19;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

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

/* Dynamic Background Aesthetics */
.background-gradient {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.1), transparent 40%),
                radial-gradient(circle at bottom left, rgba(239, 68, 68, 0.05), transparent 40%);
    z-index: -2;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.5;
    animation: float 20s ease-in-out infinite alternate;
}

.orb1 {
    width: 300px; height: 300px;
    background: #3b82f6;
    top: 10%; left: 20%;
}

.orb2 {
    width: 250px; height: 250px;
    background: #8b5cf6;
    bottom: 20%; right: 20%;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Main Container */
.app-container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    z-index: 10;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fade-in 1s ease-out;
}

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

.logo-mark {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Glassmorphism Panels */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

/* Upload Section */
.upload-section {
    cursor: pointer;
    text-align: center;
    border: 2px dashed rgba(255,255,255,0.2);
}

.upload-section:hover, .upload-section.dragover {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.upload-section:hover .upload-icon {
    color: var(--accent);
}

.upload-content h3 { margin-bottom: 0.5rem; font-weight: 600; }
.upload-content .highlight { color: var(--accent); font-weight: 600; }
.upload-content .subtitle { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.5rem; }

/* Loading State */
.loading-state {
    display: none;
    text-align: center;
    padding: 3rem 0;
}

.spinner {
    width: 40px; height: 40px;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem auto;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* Results Section */
.result-section {
    display: none;
    animation: slide-up 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slide-up {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.preview-container {
    width: 100%;
    height: 250px;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 2rem;
    position: relative;
    background: #000;
}

#preview-img {
    width: 100%; height: 100%;
    object-fit: contain;
}

.status-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.status-header h2 { font-size: 1.25rem; font-weight: 600; }

.badge {
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.danger { background: rgba(239, 68, 68, 0.2); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.3); }
.badge.success { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; border: 1px solid rgba(16, 185, 129, 0.3); }

.metric-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

#confidence-text { color: var(--text-primary); font-weight: 600; }

.progress-track {
    width: 100%; height: 8px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 2rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 1s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s;
}

.reset-btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--glass-border);
}

.reset-btn:hover {
    background: rgba(255,255,255,0.1);
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* YOLO Box Overlay Elements */
#bbox-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none; /* allows clicking through boxes if needed */
}

.bounding-box {
    position: absolute;
    border: 2px solid;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
    transition: all 0.2s ease;
}

.box-danger {
    border-color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
}

.box-safe {
    border-color: #10b981;
    background-color: rgba(16, 185, 129, 0.1);
}

.box-label {
    position: absolute;
    top: -24px;
    left: -2px;
    color: #fff;
    padding: 2px 6px;
    font-size: 11px;
    font-weight: 700;
    white-space: nowrap;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.box-danger .box-label { background: #ef4444; }
.box-safe .box-label { background: #10b981; }