:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    --drop-active: rgba(99, 102, 241, 0.2);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic animated background */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background:
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.15) 0%, transparent 50%);
    animation: bg-pulse 10s ease-in-out infinite alternate;
}

@keyframes bg-pulse {
    0% {
        transform: scale(1);
    }

    100% {
        transform: scale(1.1);
    }
}

.container {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    border-radius: 24px;
    margin: 20px;
}

/* Glassmorphism panel */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.glass-panel-inner {
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.icon-wrap {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

h1 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #a5b4fc, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.drop-zone {
    border: 2px dashed var(--panel-border);
    border-radius: 16px;
    padding: 3rem 1rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
}

.drop-zone:hover,
.drop-zone.active {
    border-color: var(--primary-color);
    background: var(--drop-active);
}

.drop-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.drop-content h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.or-text {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 1rem 0;
}

.hidden {
    display: none !important;
}

.btn {
    font-family: inherit;
    cursor: pointer;
    border: none;
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.browse-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.browse-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

#loading-zone {
    text-align: center;
    padding: 2rem;
}

/* Preview Section */
.slide-up {
    animation: slideUp 0.4s ease-out forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.preview-card {
    margin-bottom: 1.5rem;
}

.image-wrapper {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.5rem;
    border: 1px solid var(--panel-border);
}

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

.file-info {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.control-group {
    margin-bottom: 1.25rem;
}

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

select {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--panel-border);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    appearance: none;
    cursor: pointer;
    outline: none;
}

select:focus {
    border-color: var(--primary-color);
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: '▼';
    font-size: 0.8rem;
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-muted);
}

/* Range input styling */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]:focus {
    outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

input[type=range]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
    transition: transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Chrome Extension specific adjusting */
@media (max-width: 400px) {
    body {
        align-items: flex-start;
    }

    .container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        border: none;
    }
}