/* ==========================================
   TEMA DARK MINIMALISTA - LOGIN
   Dois Concursados - Portal de Estudos
========================================== */

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #656d76;
    --accent-blue: #d3a832;
    --accent-hover: #e6b63d;
    --border-color: #30363d;
    --border-muted: #21262d;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.5);
    --gradient: linear-gradient(135deg, #d3a832 0%, #e6b63d 100%);
    --error-color: #ff6b6b;
    --success-color: #51cf66;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Background com gradiente sutil */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 25% 25%, rgba(211, 168, 50, 0.1) 0%, transparent 50%), 
                radial-gradient(circle at 75% 75%, rgba(211, 168, 50, 0.05) 0%, transparent 50%);
    z-index: -1;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-form {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.login-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient);
    border-radius: 16px 16px 0 0;
}

.login-form h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.login-form p {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 32px;
    font-size: 1rem;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(211, 168, 50, 0.1);
    background: var(--bg-hover);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group button {
    width: 100%;
    padding: 14px;
    background: var(--gradient);
    border: none;
    border-radius: 8px;
    color: var(--bg-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-blue) 100%);
}

.form-group button:active {
    transform: translateY(0);
}

.form-group button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.error-message {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    color: var(--error-color);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    text-align: center;
}

.success-message {
    background: rgba(81, 207, 102, 0.1);
    border: 1px solid rgba(81, 207, 102, 0.3);
    color: var(--success-color);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    text-align: center;
}

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

.login-form {
    animation: fadeIn 0.6s ease-out;
}

/* Responsividade */
@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    .login-form {
        padding: 32px 24px;
    }
    
    .login-form h1 {
        font-size: 1.75rem;
    }
}

/* Melhorias de acessibilidade */
.form-group input:invalid {
    border-color: rgba(255, 107, 107, 0.5);
}

.form-group input:valid {
    border-color: rgba(81, 207, 102, 0.5);
}

/* Efeitos visuais adicionais */
.login-form:hover {
    box-shadow: var(--shadow-hover);
}

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

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

/* Seleção de texto */
::selection {
    background: rgba(211, 168, 50, 0.3);
    color: var(--text-primary);
}

/* Proteção contra impressão */
@media print {
    body {
        display: none !important;
    }
}

/* Loading states */
.form-loading {
    position: relative;
    pointer-events: none;
}

.form-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--accent-blue);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Focus visible para acessibilidade */
input:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}