/* ============================================
   RESET E VARIÁVEIS GLOBAIS
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cores Principais */
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --secondary: #7c3aed;
    --accent: #3b82f6;
    
    /* Cores Neutras */
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --border: #e2e8f0;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    /* Espaçamentos */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    line-height: 1.6;
}

/* ============================================
   PÁGINA DE LOGIN
   ============================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-lg);
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-box {
    background: var(--bg-white);
    border-radius: 16px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.4s ease-out;
}

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

.login-box .logo {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.login-box .logo svg {
    width: 64px;
    height: 64px;
    color: var(--primary);
}

.login-box h1 {
    text-align: center;
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
}

.login-box .subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.error-message {
    background: #fee2e2;
    color: #dc2626;
    padding: var(--spacing-sm);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.btn-primary {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.login-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    text-align: center;
}

.login-footer p {
    font-size: 0.875rem;
    color: var(--text-gray);
    margin-bottom: var(--spacing-xs);
}

.login-footer .hint {
    font-size: 0.75rem;
    color: var(--text-gray);
    opacity: 0.7;
}

/* ============================================
   PÁGINA DE CHAT
   ============================================ */
.chat-page {
    height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    height: 100vh;
}

/* SIDEBAR */
.sidebar {
    width: 280px;
    background: var(--bg-white);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-small svg {
    color: var(--primary);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.sidebar-nav h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-gray);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: 8px;
    text-align: left;
    color: var(--text-gray);
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9375rem;
}

.nav-item:hover {
    background: var(--bg-light);
    color: var(--text-dark);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.nav-item svg {
    flex-shrink: 0;
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.btn-logout {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-gray);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9375rem;
}

.btn-logout:hover {
    background: #fee2e2;
    color: #dc2626;
    border-color: #fecaca;
}

/* MAIN CONTENT */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: var(--spacing-xl);
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
}

.chat-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.chat-header p {
    color: var(--text-gray);
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    background: var(--bg-light);
}

.welcome-message {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-xl);
}

.welcome-icon {
    margin: 0 auto var(--spacing-lg);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.welcome-message h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.welcome-message p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-xl);
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.suggestion-chip {
    padding: var(--spacing-md);
    background: var(--bg-white);
    border: 2px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
    color: var(--text-dark);
}

.suggestion-chip:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.message {
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-user {
    display: flex;
    justify-content: flex-end;
}

.message-user .message-content {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 18px 18px 4px 18px;
    max-width: 70%;
    box-shadow: var(--shadow);
}

.message-assistant {
    display: flex;
    justify-content: flex-start;
}

.message-assistant .message-content {
    background: var(--bg-white);
    color: var(--text-dark);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 18px 18px 18px 4px;
    max-width: 70%;
    box-shadow: var(--shadow);
}

.message-loading {
    display: flex;
    gap: 6px;
    padding: var(--spacing-md);
}

.message-loading span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    animation: bounce 1.4s infinite ease-in-out both;
}

.message-loading span:nth-child(1) { animation-delay: -0.32s; }
.message-loading span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.chat-input {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--bg-white);
    border-top: 1px solid var(--border);
}

.chat-input input {
    flex: 1;
    padding: 0.875rem var(--spacing-lg);
    border: 2px solid var(--border);
    border-radius: 24px;
    font-size: 1rem;
    transition: all 0.2s;
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.btn-send {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-send:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn-send:active {
    transform: scale(0.95);
}

/* ============================================
   RESPONSIVO
   ============================================ */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .message-user .message-content,
    .message-assistant .message-content {
        max-width: 85%;
    }
    
    .suggestions {
        grid-template-columns: 1fr;
    }
}