:root {
    /* Asimov Brand Colors */
    --asimov-blue: #1A73E9;
    --asimov-blue-glow: rgba(26, 115, 233, 0.4);
    --asimov-orange: #FB742D;
    
    /* Dark Theme Palette */
    --bg-page: #0F0F12;      /* Quase preto */
    --bg-card: #18181B;      /* Cinza muito escuro */
    --bg-input: #09090b;     /* Fundo do input */
    
    --text-primary: #FFFFFF;
    --text-secondary: #A1A1AA;
    --text-muted: #52525B;
    
    --border-color: #27272A;
    --border-hover: #3F3F46;
    
    /* Spacing & Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 24px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* Background Glow Effect */
.background-glow {
    position: fixed;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 115, 233, 0.15) 0%, rgba(15, 15, 18, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 580px;
    background: rgba(24, 24, 27, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 0.6s ease-out;
}

/* Header Styles */
.header-content {
    text-align: center;
    margin-bottom: 2.5rem;
}

.badge {
    display: inline-block;
    background: rgba(26, 115, 233, 0.1);
    color: var(--asimov-blue);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 100px;
    margin-bottom: 1rem;
    border: 1px solid rgba(26, 115, 233, 0.2);
    letter-spacing: 0.05em;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.03em;
    background: linear-gradient(to right, #fff, #a1a1aa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 span {
    color: var(--asimov-blue); /* Fallback */
    -webkit-text-fill-color: var(--asimov-blue);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 400px;
    margin: 0 auto;
}

/* Input Styles */
.input-wrapper {
    margin-bottom: 1.5rem;
    position: relative;
}

.input-group {
    position: relative;
}

input[type="url"] {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 16px 18px;
    font-size: 1rem;
    border-radius: var(--radius-md);
    outline: none;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

input[type="url"]:focus {
    border-color: var(--asimov-blue);
    box-shadow: 0 0 0 4px rgba(26, 115, 233, 0.1);
}

input[type="url"]::placeholder {
    color: var(--text-muted);
}

/* Button Styles */
button {
    width: 100%;
    padding: 16px;
    border-radius: var(--radius-md);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: 'Inter', sans-serif;
}

#downloadBtn {
    background: var(--asimov-blue);
    color: white;
    box-shadow: 0 4px 12px rgba(26, 115, 233, 0.3);
}

#downloadBtn:hover:not(:disabled) {
    background: #1557b0;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(26, 115, 233, 0.4);
}

#downloadBtn:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    margin-top: 1rem;
}

.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Logs Terminal */
.log-container {
    margin-top: 2rem;
    background: #000;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: none;
    animation: slideDown 0.3s ease;
}

.log-container.active { display: block; }

.log-header {
    background: rgba(255, 255, 255, 0.03);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.log-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.copy-logs-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 4px 8px;
    width: auto;
    height: auto;
    display: flex;
    align-items: center;
    gap: 4px;
}

.copy-logs-btn:hover {
    color: var(--text-primary);
    transform: none;
    box-shadow: none;
}

.log-content {
    height: 250px;
    overflow-y: auto;
    padding: 16px;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.log-entry {
    margin-bottom: 6px;
    word-break: break-all;
}

.log-entry:last-child {
    color: var(--asimov-orange); /* Highlight última linha */
    font-weight: 500;
}

/* Scrollbar para logs */
.log-content::-webkit-scrollbar { width: 6px; }
.log-content::-webkit-scrollbar-track { background: transparent; }
.log-content::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }

/* Mensagens de Sucesso/Erro */
.success-message, .error-message {
    margin-top: 1.5rem;
    padding: 16px;
    border-radius: var(--radius-md);
    display: none;
    animation: fadeIn 0.3s ease;
    align-items: flex-start;
    gap: 12px;
}

.success-message.active, .error-message.active { display: flex; }

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.success-text h3 {
    color: #10B981;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.success-message a {
    color: #10B981;
    font-size: 0.9rem;
    text-decoration: underline;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.error-text h3 {
    color: #EF4444;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

#errorText { color: #FCA5A5; font-size: 0.9rem; }

/* Animações */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { opacity: 0; height: 0; }
    to { opacity: 1; height: auto; }
}

/* Responsividade */
@media (max-width: 640px) {
    .container { padding: 1.5rem; }
    h1 { font-size: 2rem; }
}