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

:root {
    --font-family: 'DM Sans', sans-serif;
    --bg-app: #f3f4f6;
    --bg-sidebar: #fafafa;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --accent-purple: #4f46e5;
    --accent-blue: #3b82f6;
    --sidebar-width: 260px;
    --banner-bg: #3b3a36;
}

/* TEMA ESCURO (DARK MODE) */
body.dark-theme {
    --bg-app: #111827;
    --bg-sidebar: #1f2937;
    --bg-card: #1f2937;
    --border-color: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --banner-bg: #1f2937;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    color: var(--text-primary);
    background-color: var(--bg-app);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Classes Auxiliares de Exibição */
.hidden {
    display: none !important;
}

/* Announcement Banner */
.announcement-banner {
    background-color: var(--banner-bg);
    color: #f3f4f6;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 0.95rem;
    font-weight: 500;
    z-index: 1000;
    transition: background-color 0.3s ease;
}

.banner-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.banner-upgrade-btn {
    background-color: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 3px 12px;
    border-radius: 6px;
    font-family: var(--font-family);
    cursor: pointer;
    font-size: 0.9rem;
}
.banner-upgrade-btn:hover { background-color: rgba(255, 255, 255, 0.3); }

.banner-close-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.1rem;
}

/* App Layout */
.app-container {
    display: flex;
    flex: 1;
    height: calc(100vh - 40px);
    overflow: hidden;
    position: relative;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 12px;
    gap: 12px;
    z-index: 1200;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s ease, border-color 0.3s ease;
}

.sidebar-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    z-index: 1100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
}

.sidebar-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

.sidebar-top {
    display: flex;
    justify-content: flex-end;
}

.sidebar-toggle-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
}
.sidebar-toggle-btn:hover { background-color: rgba(255,255,255,0.05); }

.new-chat-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    transition: background-color 0.2s, border-color 0.2s;
}
.new-chat-btn i:first-child { color: var(--accent-purple); font-size: 1.2rem; }
.new-chat-btn .dropdown-icon { margin-left: auto; color: var(--text-muted); }

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
}

.nav-item i { font-size: 1.2rem; }
.nav-item:hover { background-color: rgba(128,128,128,0.1); color: var(--text-primary); }
.nav-item.active { background-color: rgba(128,128,128,0.15); color: var(--text-primary); font-weight: 600; }

.sidebar-section-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

.chat-mode-toggle {
    display: flex;
    background-color: rgba(128,128,128,0.1);
    padding: 3px;
    border-radius: 8px;
    gap: 2px;
}

.mode-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 6px;
    border-radius: 6px;
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.mode-btn.active {
    background-color: var(--bg-card);
    color: var(--text-primary);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.recents-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.recents-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 0 8px;
}

.add-recent-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1rem;
}

.recents-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.recent-item {
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    cursor: pointer;
}
.recent-item:hover { background-color: rgba(128,128,128,0.1); color: var(--text-primary); }

.sidebar-promo-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    position: relative;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.promo-icon {
    font-size: 1.2rem;
    color: var(--accent-purple);
    background-color: rgba(99, 102, 241, 0.1);
    padding: 6px;
    border-radius: 8px;
}

.promo-text strong {
    font-size: 0.85rem;
    display: block;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.promo-text p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.promo-close {
    position: absolute;
    top: 8px;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
    position: relative;
}

.user-account {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}
.user-account:hover { background-color: rgba(128,128,128,0.1); }

.user-avatar-img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent-purple);
    color: white;
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-details {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.account-name { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.account-plan { font-size: 0.8rem; color: var(--text-muted); }

/* AÇÕES DE CONVIDADO NA SIDEBAR */
.guest-account-actions {
    display: flex;
    gap: 8px;
    padding: 4px 0;
}

.btn-guest-login, .btn-guest-signup {
    flex: 1;
    text-align: center;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-guest-login {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-guest-signup {
    background-color: #3b82f6;
    color: white;
}

/* POPOVER DO PERFIL */
.profile-popover {
    position: absolute;
    bottom: 55px;
    left: 8px;
    width: 240px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    padding: 8px 0;
    display: none;
    flex-direction: column;
    z-index: 1300;
    animation: popoverFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.profile-popover.active {
    display: flex;
}

@keyframes popoverFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.popover-header {
    padding: 8px 16px;
    display: flex;
    flex-direction: column;
}

.popover-user-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.popover-user-email {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.popover-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 6px 0;
}

.popover-menu {
    display: flex;
    flex-direction: column;
}

.popover-item {
    background: none;
    border: none;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    text-align: left;
    transition: background 0.15s, color 0.15s;
}

.popover-item:hover {
    background-color: rgba(128,128,128,0.1);
    color: var(--text-primary);
}

.popover-item.logout-item {
    color: #ef4444;
}

.popover-item.logout-item:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

/* Main Content Area */
.main-content {
    flex: 1;
    background-color: var(--bg-card);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden; /* Mantém o layout preso à tela */
    border-top-left-radius: 16px;
    border-left: 1px solid var(--border-color);
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* --- TOP NAVBAR --- */
.top-navbar {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-card);
    gap: 12px;
    z-index: 100;
}

.top-navbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    max-width: 380px;
}

.menu-open-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.menu-open-btn:hover {
    background-color: var(--bg-app);
    color: var(--text-primary);
}

.search-bar-mini {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-app);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 5px;
    width: 100%;
    max-width: 280px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-bar-mini:focus-within {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.15);
}

.search-bar-mini i {
    color: var(--text-muted);
    font-size: 1rem;
}

.search-bar-mini input {
    background: none;
    border: none;
    outline: none;
    font-family: var(--font-family);
    font-size: 0.9rem;
    width: 100%;
    color: var(--text-primary);
}

.top-navbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logged-user-tools {
    display: flex;
    align-items: center;
    gap: 10px;
}

.credits-badge {
    background-color: var(--bg-app);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.upgrade-btn-top {
    background-color: var(--accent-purple);
    color: white;
    border: none;
    padding: 7px 16px;
    border-radius: 5px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: background 0.2s;
}

.upgrade-btn-top:hover {
    background-color: #4338ca;
}

/* BOTÕES DE LOGIN / SIGN IN (DESLOGADO - ESTILO IDÊNTICO À IMAGEM) */
.guest-user-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-nav-login {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 7px 16px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: background-color 0.2s, border-color 0.2s;
    white-space: nowrap;
}

.btn-nav-login:hover {
    background-color: var(--bg-app);
}

.btn-nav-signup {
    background-color: #3b82f6;
    color: white;
    padding: 7px 16px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: background-color 0.2s;
    white-space: nowrap;
}

.btn-nav-signup:hover {
    background-color: #2563eb;
}

/* BOTÃO DE TEMA (DARK/LIGHT) */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
    transition: background-color 0.2s, border-color 0.2s, transform 0.2s;
    flex-shrink: 0;
}

.theme-toggle-btn:hover {
    background-color: var(--bg-app);
    color: var(--text-primary);
    transform: scale(1.05);
}

/* RESPONSIVIDADE MOBILE DO CABEÇALHO */
@media (max-width: 600px) {
    .top-navbar {
        padding: 0 10px;
    }

    .search-bar-mini {
        max-width: 130px;
        padding: 5px 8px;
    }

    .btn-nav-login, .btn-nav-signup {
        padding: 6px 12px;
        font-size: 0.82rem;
    }
}


.theme-icon-moon, .theme-icon-sun {
    position: absolute;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.theme-icon-sun {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

.theme-icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

body.dark-theme .theme-icon-moon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

body.dark-theme .theme-icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* Workspace & Hero */
.workspace {
    flex: 1;
    overflow-y: auto;
    padding: 30px 24px 40px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    scroll-behavior: smooth;
    position: relative;
}

/* Quando o chat está ativo, reserva espaço apenas para a barra fixa no fundo */
.workspace.chat-active {
    padding-bottom: 100px;
}


.workspace.chat-active {
    padding-bottom: 140px; /* Garante que o conteúdo e o footer não fiquem tapados pela barra fixa */
}

.hero-section {
    max-width: 720px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
}

/* Chat Input Wrapper */
.chat-input-wrapper {
    width: 100%;
    max-width: 720px;
    margin: 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 50;
}

.chat-input-wrapper.fixed-bottom {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0 20px;
    width: 100%;
    max-width: 760px;
    animation: slideUpBottom 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUpBottom {
    from {
        opacity: 0;
        transform: translate(-50%, 40px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

/* Prompt Box Card */
.prompt-box-card {
    width: 100%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: all 0.3s ease;
}

.prompt-box-card:focus-within {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.prompt-top-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-app);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    width: fit-content;
    transition: opacity 0.3s ease;
}

.prompt-top-pill.hidden {
    opacity: 0;
    height: 0;
    padding: 0;
    margin: 0;
    overflow: hidden;
    pointer-events: none;
}

.badge-new {
    background-color: rgba(99, 102, 241, 0.2);
    color: var(--accent-purple);
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.8rem;
}

.prompt-actions-row {
    display: flex;
    gap: 8px;
    transition: opacity 0.3s ease;
}

.prompt-actions-row.hidden {
    opacity: 0;
    height: 0;
    margin: 0;
    overflow: hidden;
    pointer-events: none;
}

.action-pill {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-family: var(--font-family);
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    background-color: var(--bg-app);
}
.action-pill:hover { background-color: var(--border-color); color: var(--text-primary); }

#chatForm textarea {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-family);
    font-size: 1.05rem;
    color: var(--text-primary);
    padding: 8px 0;
    min-height: 50px;
    max-height: 150px;
}

.prompt-bottom-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.prompt-left-tools {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tool-icon-btn {
    background: none;
    border: 1px solid var(--border-color);
    width: 32px;
    height: 32px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
}
.tool-icon-btn:hover { background-color: var(--bg-app); }

.model-select-dropdown {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
}
.model-select-dropdown:hover { background-color: var(--bg-app); }

.mode-indicator {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.send-prompt-btn {
    background-color: var(--border-color);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: all 0.2s;
}
.send-prompt-btn.active {
    background-color: var(--accent-purple);
    color: white;
    transform: scale(1.05);
}

/* Quick Chips Grid */
.quick-chips-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    width: 100%;
    margin-top: 10px;
}

.quick-chip {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 10px 16px;
    border-radius: 20px;
    font-family: var(--font-family);
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    transition: all 0.2s;
}
.quick-chip:hover { border-color: var(--accent-purple); color: var(--accent-purple); background-color: rgba(99, 102, 241, 0.05); transform: translateY(-2px); }

/* ==========================================================================
   ESTILO DAS MENSAGENS (IDÊNTICO À INTERFACE DO RUNWAY / FOCOAI)
   ========================================================================== */

/* Container geral das mensagens */
.chat-results-container {
    width: 100%;
    max-width: 680px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 24px;
    padding-top: 10px;
}

/* Base de cada mensagem */
.chat-message {
    display: flex;
    flex-direction: column;
    animation: fadeInMsg 0.25s ease forwards;
    opacity: 0;
    transform: translateY(6px);
}

@keyframes fadeInMsg {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- MENSAGEM DO USUÁRIO --- */
.chat-message.user {
    align-self: flex-end;
    max-width: 82%;
}

.chat-message.user .message-bubble {
    background-color: #f0f2f5; /* Cinza bem claro suave igual à imagem */
    color: #111827;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.98rem;
    line-height: 1.5;
    font-weight: 400;
    word-break: break-word;
    border: none;
    box-shadow: none;
}

/* Suporte ao Tema Escuro para a mensagem do usuário */
body.dark-theme .chat-message.user .message-bubble {
    background-color: #374151;
    color: #f9fafb;
}

/* --- MENSAGEM DA IA (TEXTO PURO SEM BALÃO) --- */
.chat-message.ai {
    align-self: flex-start;
    width: 100%;
    max-width: 100%;
}

.chat-message.ai .message-bubble {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    font-weight: 400;
}

/* Barra de Ações Rápidas (Like / Dislike) abaixo da mensagem da IA */
.chat-ai-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.ai-action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.ai-action-btn:hover {
    color: var(--text-primary);
}

/* --- INDICADOR DE PROCESSAMENTO ("Thinking...") --- */
.thinking-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #a855f7; /* Roxo vibrante/elegante */
    font-size: 0.95rem;
    font-weight: 500;
    padding: 4px 0;
}

.thinking-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(168, 85, 247, 0.2);
    border-top-color: #a855f7;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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


/* MODAL DE CONFIRMAÇÃO DE LOGOUT */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.modal-backdrop.active {
    display: flex;
    opacity: 1;
}

.modal-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    width: 90%;
    max-width: 380px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    transform: scale(0.9);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.active .modal-card {
    transform: scale(1);
}

.modal-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.modal-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.modal-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    width: 100%;
}

.modal-actions button {
    flex: 1;
    padding: 10px;
    border-radius: 8px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}

.btn-cancel {
    background-color: var(--bg-app);
    color: var(--text-primary);
    border: 1px solid var(--border-color) !important;
}

.btn-cancel:hover { background-color: var(--border-color); }

.btn-confirm-logout {
    background-color: #ef4444;
    color: white;
}

.btn-confirm-logout:hover { background-color: #dc2626; }

/* Responsividade Mobile */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        box-shadow: 5px 0 25px rgba(0,0,0,0.15);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .menu-open-btn { display: block; }
    .media-cards-grid { grid-template-columns: 1fr; }
    .hero-title { font-size: 1.6rem; text-align: center; }
    .chat-input-wrapper.fixed-bottom { padding: 0 12px; bottom: 12px; }
}