:root {
    --bg-deep: #050505;
    --bg-card: rgba(20, 20, 25, 0.7);
    --primary: #00f2ff;
    --secondary: #bd00ff;
    --text-main: #ffffff;
    --text-dim: #8888aa;
    --border: rgba(255, 255, 255, 0.1);
    --success: #10b981;
    --error: #ff4444;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-deep);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(189, 0, 255, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 242, 255, 0.1) 0%, transparent 40%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.header { text-align: center; }
.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}
.subtitle { color: var(--text-dim); }

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(0, 242, 255, 0.05);
}

.upload-content .icon { font-size: 3rem; margin-bottom: 1rem; }
.upload-content p { font-size: 1.1rem; margin-bottom: 0.5rem; }
.upload-content .small { font-size: 0.9rem; color: var(--text-dim); }
.browse-link { color: var(--primary); text-decoration: underline; cursor: pointer; }

.password-section, .result-section {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.hidden { display: none !important; }

.form-group { margin-bottom: 1.5rem; }
label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: var(--text-dim); }
input[type="password"], input[type="file"] {
    width: 100%;
    padding: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    outline: none;
}
input:focus { border-color: var(--primary); }

.hint { color: var(--error); font-size: 0.9rem; margin-top: 0.5rem; }

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0, 242, 255, 0.3); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-secondary { background: var(--success); margin-bottom: 1rem; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-main); }
.btn-outline:hover { border-color: var(--primary); background: rgba(255,255,255,0.05); }

.result-header { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem; }
.actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.actions .btn { flex: 1; min-width: 120px; }

.preview-box {
    background: rgba(0,0,0,0.3);
    padding: 1.5rem;
    border-radius: 8px;
    max-height: 400px;
    overflow-y: auto;
    font-family: monospace;
    white-space: pre-wrap;
    color: #d1d5db;
    border: 1px solid var(--border);
}

.file-error {
    color: #ff4444;
    font-size: 0.9rem;
    margin-top: 1rem;
    font-weight: 600;
    text-align: center;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}