:root {
    --primary-color: #6366f1;
    --secondary-color: #a855f7;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --panel-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --success-color: #10b981;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    overflow-x: hidden;
}

.container {
    max-width: 900px;
    width: 100%;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

p.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.upload-card {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

.upload-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 25px 60px rgba(99, 102, 241, 0.2);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 60px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.drop-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.drop-zone svg {
    width: 60px;
    height: 60px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.drop-zone span {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

#fileInput {
    display: none;
}

.results-section {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #4f46e5;
    transform: scale(1.02);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.chat-card {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 24px;
    margin-bottom: 20px;
}

.message {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.message:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.label {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.label-user {
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
}

.label-thought {
    background: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
}

.label-ai {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.content {
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    font-size: 1rem;
}

.thought-content {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.95rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    border-radius: 12px;
    border-left: 3px solid #fbbf24;
}

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

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

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

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

.file-header {
    background: rgba(255, 255, 255, 0.03);
    padding: 12px 20px;
    border-radius: 10px;
    margin: 30px 0 20px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.file-header:first-child {
    margin-top: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}