:root {
    --primary-green: #00ff7f;
    --dark-bg: #0d1117;
    --dark-bg-secondary: #161b22;
    --border-color: #30363d;
    --text-color: #c9d1d9;
    --text-color-secondary: #8b949e;
    --font-family: 'Fira Code', monospace;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--dark-bg);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 2rem 1rem;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(0deg, transparent 24%, var(--border-color) 25%, var(--border-color) 26%, transparent 27%, transparent 74%, var(--border-color) 75%, var(--border-color) 76%, transparent 77%, transparent), linear-gradient(90deg, transparent 24%, var(--border-color) 25%, var(--border-color) 26%, transparent 27%, transparent 74%, var(--border-color) 75%, var(--border-color) 76%, transparent 77%, transparent);
    background-size: 50px 50px;
    animation: scanlines 10s linear infinite;
    z-index: -1;
    opacity: 0.1;
}

@keyframes scanlines {
    0% { background-position: 0 0; }
    100% { background-position: 50px 50px; }
}

.container {
    width: 100%;
    max-width: 800px;
    background-color: var(--dark-bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 0 30px rgba(0, 255, 127, 0.1);
    animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    color: var(--primary-green);
    font-size: 2.5rem;
    text-shadow: 0 0 10px var(--primary-green);
    letter-spacing: 2px;
    word-break: break-word;
}

.subtitle {
    color: var(--text-color-secondary);
    font-size: 1rem;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.tab-link {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    text-align: center;
    flex: 1 1 0;
    white-space: nowrap;
}

.tab-link.active, .tab-link:hover {
    color: var(--primary-green);
    border-bottom-color: var(--primary-green);
}

.tab-content { display: none; }
.tab-content.active {
    display: block;
    animation: slideUp 0.5s ease-in-out;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.operation-box { margin-bottom: 1.5rem; }
h2 {
    color: var(--text-color);
    margin-bottom: 1rem;
    border-left: 3px solid var(--primary-green);
    padding-left: 0.5rem;
}
.drop-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}
.drop-area.highlight {
    border-color: var(--primary-green);
    background-color: rgba(0, 255, 127, 0.05);
}
.drop-area p { color: var(--text-color-secondary); }
.file-preview {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 1rem;
}
.remove-btn {
    background: none;
    border: none;
    color: #ff4d4d;
    font-size: 1.5rem;
    cursor: pointer;
    transition: transform 0.2s;
}
.remove-btn:hover { transform: scale(1.2); }
.text-area {
    width: 100%;
    height: 150px;
    background-color: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    color: var(--text-color);
    font-family: var(--font-family);
    resize: vertical;
}
.text-area:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 10px rgba(0, 255, 127, 0.2);
}
.password-section {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}
.password-input {
    flex-grow: 1;
    background-color: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
}
.password-input:focus {
    outline: none;
    border-color: var(--primary-green);
}
.action-btn {
    background-color: var(--primary-green);
    color: var(--dark-bg);
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 150px;
}
.action-btn:hover {
    box-shadow: 0 0 15px var(--primary-green);
    transform: translateY(-2px);
}
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(13, 17, 23, 0.3);
    border-top-color: var(--dark-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }

footer {
    text-align: center;
    margin-top: 2rem;
    color: var(--text-color-secondary);
    font-size: 0.9rem;
}
footer a { color: var(--primary-green); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ==============================================
==== CSS RESPONSIVO FINAL (LAYOUT VERTICAL) ====
==============================================
*/

@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }

    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.7rem;
    }

    h2 {
        font-size: 1.15rem;
    }

    /* --- LAYOUT VERTICAL PARA AS ABAS --- */
    .tabs {
        flex-direction: column; /* FORÇA O EMPILHAMENTO VERTICAL DAS OPÇÕES */
        border-bottom: none;
        gap: 0.5rem; /* Adiciona um pequeno espaço entre os botões */
    }
    
    .tab-link {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
        text-align: center;
        border-radius: 4px;
        white-space: normal; /* Permite que o texto quebre, se necessário */
    }
    
    .tab-link.active {
        border: 1px solid var(--primary-green); /* Borda completa para o item ativo */
        background-color: rgba(0, 255, 127, 0.05);
    }

    .tab-link:last-child {
        border-bottom: 1px solid var(--border-color);
    }
    .tab-link.active:last-child {
        border: 1px solid var(--primary-green);
    }
    /* --- FIM DO LAYOUT DAS ABAS --- */

    /* --- LAYOUT VERTICAL PARA A SEÇÃO DE SENHA --- */
    .password-section {
        flex-direction: column; /* FORÇA O EMPILHAMENTO VERTICAL DA SENHA E BOTÃO */
        gap: 0.8rem;
    }

    .password-input,
    .action-btn {
        width: 100%;
        min-width: auto;
    }

    .file-preview {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .file-preview span {
        max-width: 100%;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
}