:root {
    --cor-fundo: #f8fafc;
    --cor-container: #ffffff;
    --cor-borda: #e2e8f0;
    --cor-texto: #1e293b;
    --cor-texto-secundario: #64748b;
    --cor-primaria: #ff0000;
    --cor-primaria-hover: #cc0000;
    --cor-youtube: #ff0000;
    --sombra: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transicao: all 0.3s ease;
}

.tema-escuro {
    --cor-fundo: #0f172a;
    --cor-container: #1e293b;
    --cor-borda: #334155;
    --cor-texto: #f1f5f9;
    --cor-texto-secundario: #cbd5e1;
    --cor-primaria: #ff4444;
    --cor-primaria-hover: #ff6666;
    --sombra: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

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

body {
    background: var(--cor-fundo);
    color: var(--cor-texto);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    padding: 20px;
    min-height: 100vh;
    transition: var(--transicao);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 40px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    width: 100%;
    max-width: 900px;
}

.logo-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 20px;
}

.logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: var(--transicao);
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 12px;
    filter: drop-shadow(0 4px 8px rgba(255, 0, 0, 0.2));
}

.logo-light {
    opacity: 0;
}

.logo-dark {
    opacity: 1;
}

/* No modo escuro, invertemos as opacidades */
.tema-escuro .logo-light {
    opacity: 1;
}

.tema-escuro .logo-dark {
    opacity: 0;
}

.logo:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 6px 12px rgba(255, 0, 0, 0.3));
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    background: var(--cor-container);
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--sombra);
    border: 1px solid var(--cor-borda);
    transition: var(--transicao);
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin: 0 0 16px 0;
    color: var(--cor-texto);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

h1 i {
    color: var(--cor-youtube);
    font-size: 2rem;
}

.descricao {
    color: var(--cor-texto-secundario);
    margin-bottom: 32px;
    font-size: 1.1rem;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.formulario {
    display: grid;
    gap: 24px;
}

.campo-grupo {
    display: grid;
    gap: 10px;
}

label {
    font-weight: 600;
    color: var(--cor-texto);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

input[type="text"] {
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    border: 2px solid var(--cor-borda);
    border-radius: 12px;
    background: var(--cor-fundo);
    color: var(--cor-texto);
    transition: var(--transicao);
    font-family: inherit;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--cor-primaria);
    box-shadow: 0 0 0 4px rgba(255, 0, 0, 0.1);
    transform: translateY(-1px);
}

input[type="text"]:read-only {
    background: var(--cor-borda);
    cursor: default;
    opacity: 0.8;
}

textarea {
    width: 100%;
    padding: 16px 20px;
    font-size: 14px;
    border: 2px solid var(--cor-borda);
    border-radius: 12px;
    background: var(--cor-fundo);
    color: var(--cor-texto);
    transition: var(--transicao);
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    resize: vertical;
    min-height: 120px;
    line-height: 1.5;
}

textarea:focus {
    outline: none;
    border-color: var(--cor-primaria);
    box-shadow: 0 0 0 4px rgba(255, 0, 0, 0.1);
}

textarea:read-only {
    background: var(--cor-borda);
    cursor: default;
    resize: none;
    opacity: 0.9;
}

.botao {
    background: linear-gradient(135deg, var(--cor-primaria), var(--cor-primaria-hover));
    color: white;
    border: none;
    padding: 16px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transicao);
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 56px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.botao:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 0, 0, 0.3);
}

.botao:active {
    transform: translateY(0);
}

.botao:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.botao:hover:before {
    left: 100%;
}

.controle-tema {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: var(--cor-container);
    padding: 12px 24px;
    border-radius: 50px;
    border: 1px solid var(--cor-borda);
    margin-top: 32px;
    box-shadow: var(--sombra);
    transition: var(--transicao);
}

.controle-tema:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.tema-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--cor-texto-secundario);
    user-select: none;
}

.switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 32px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--cor-borda);
    transition: var(--transicao);
    border-radius: 32px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: var(--transicao);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
    background: var(--cor-primaria);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.botao-copiar {
    background: transparent;
    border: 2px solid var(--cor-primaria);
    color: var(--cor-primaria);
    padding: 10px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transicao);
    margin-top: 12px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.botao-copiar:hover {
    background: var(--cor-primaria);
    color: white;
    transform: translateY(-1px);
}

.video-preview {
    background: var(--cor-container);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--sombra);
    margin-top: 24px;
    padding: 20px;
    border: 1px solid var(--cor-borda);
    text-align: center;
}

.video-preview h3 {
    color: var(--cor-texto);
    margin-bottom: 16px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.codigo-html {
    background: var(--cor-container);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--cor-borda);
    margin-top: 24px;
    box-shadow: var(--sombra);
}

.codigo-html label {
    color: var(--cor-primaria);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 1rem;
}

.codigo-html label:before {
    content: "💻";
    font-size: 1.2em;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.slide-in {
    animation: slideIn 0.6s ease forwards;
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

.mensagem {
    padding: 16px 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    width: 100%;
    max-width: 900px;
    text-align: center;
    display: none;
    font-weight: 500;
    border: 1px solid;
    box-shadow: var(--sombra);
}

.mensagem.sucesso {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
    border-color: #c3e6cb;
    display: block;
}

.mensagem.erro {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
    border-color: #f5c6cb;
    display: block;
}

#thumbnailPreview {
    max-width: 100%;
    max-height: 300px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--cor-borda);
    box-shadow: var(--sombra);
    transition: var(--transicao);
}

#thumbnailPreview:hover {
    transform: scale(1.02);
}

.divisor {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cor-borda), transparent);
    margin: 32px 0;
    width: 100%;
    border-radius: 1px;
}

/* Responsividade */
@media (max-width: 768px) {
    body {
        padding: 16px;
        padding-top: 24px;
    }
    
    .container {
        padding: 24px;
    }
    
    h1 {
        font-size: 1.8rem;
        flex-direction: column;
        gap: 8px;
    }
    
    .descricao {
        font-size: 1rem;
    }
    
    .logo-container {
        width: 100px;
        height: 100px;
    }
    
    input[type="text"], textarea {
        font-size: 16px; /* Previne zoom no iOS */
    }
}

@media (max-width: 480px) {
    .controle-tema {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
    }
    
    .tema-label {
        font-size: 0.8rem;
    }
}

/* Melhorar acessibilidade */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states melhorados */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--cor-primaria);
    outline-offset: 2px;
}

/* Estados de loading */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--cor-fundo);
}

::-webkit-scrollbar-thumb {
    background: var(--cor-borda);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--cor-primaria);
}