:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent-1: #8b5cf6;
    --accent-2: #ec4899;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

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

/* Background Blobs */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 10s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: var(--accent-1);
    animation-delay: 0s;
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 40vw;
    height: 40vw;
    background: var(--accent-2);
    animation-delay: -5s;
}

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

/* Main Container */
.container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    width: 90%;
    max-width: 600px;
    box-shadow: var(--card-shadow);
    text-align: center;
    transition: all 0.3s ease;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* Upload Section */
.upload-section {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    margin-bottom: 24px;
}

.upload-section:hover, .upload-section.dragover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.icon-container {
    color: var(--primary);
    margin-bottom: 16px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.upload-content h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-content p {
    color: var(--text-muted);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 20px;
    border-radius: 8px;
    margin-top: 10px;
}

.file-name {
    font-weight: 500;
    color: var(--primary);
}

.btn-clear {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}

.btn-clear:hover {
    color: #ef4444;
}

/* Buttons */
button, .btn-primary {
    outline: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 12px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--glass-border);
    padding: 12px 24px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-convert {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    color: white;
    border: none;
    padding: 16px;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.btn-convert:hover:not(.disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.5);
}

.btn-convert.disabled {
    background: #334155;
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.7;
}

/* Loading Section */
.loading-section {
    padding: 20px 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

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

/* Result Section */
.result-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #4ade80;
}

.image-preview {
    margin-bottom: 24px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    max-height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
}

.image-preview img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

.actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.actions > * {
    flex: 1;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #ef4444;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Utilities */
.hidden {
    display: none !important;
}