/* ==========================================================================
   KROTAR — Asistente Inteligente (botón flotante + panel lateral)
   Reutiliza los tokens de style.css y las clases .btn / .form-field /
   .modal-close ya existentes. No aparece en el Hero: nav.js revela
   .assistant-fab con la clase .is-visible cuando #areas entra en el
   viewport (ver assets/js/assistant.js).
   ========================================================================== */

.assistant-fab {
    position: fixed;
    right: var(--space-5);
    bottom: var(--space-5);
    z-index: 90;
    width: 58px;
    height: 58px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-pill);
    color: var(--color-text);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.16), 0 12px 35px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    pointer-events: none;
    transition: opacity var(--duration-base) var(--ease-premium),
        transform var(--duration-base) var(--ease-premium),
        border-color var(--duration-fast) ease,
        background var(--duration-fast) ease,
        visibility 0s linear var(--duration-base);
}

.assistant-fab.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    transition: opacity var(--duration-base) var(--ease-premium),
        transform var(--duration-base) var(--ease-premium),
        border-color var(--duration-fast) ease,
        background var(--duration-fast) ease;
}

.assistant-fab:hover {
    background: rgba(255, 255, 255, 0.075);
    border-color: rgba(0, 174, 239, 0.4);
    box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.25), 0 18px 45px rgba(0, 0, 0, 0.65), 0 0 32px rgba(0, 145, 255, 0.16);
}

.assistant-fab.is-open {
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    pointer-events: none;
}

.assistant-fab-icon {
    color: var(--color-cyan);
}

/* Overlay */
.assistant-overlay {
    position: fixed;
    inset: 0;
    z-index: 90;
    background: rgba(2, 3, 6, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-base) var(--ease-premium);
}

.assistant-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* Side panel */
.assistant-panel {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 91;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(ellipse 120% 60% at 100% 0%, rgba(0, 145, 255, 0.14) 0%, transparent 55%),
        linear-gradient(165deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 40%, rgba(4, 5, 12, 0.9) 100%),
        var(--color-surface-heavy);
    border-left: 1px solid rgba(59, 130, 246, 0.22);
    box-shadow: -14px 0 44px rgba(0, 0, 0, 0.5);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-premium);
}

.assistant-panel.is-open {
    transform: translateX(0);
}

.assistant-panel-header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    padding: var(--space-5) var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.assistant-panel-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text);
}

.assistant-panel-header .modal-close {
    position: static;
}

.assistant-panel-body {
    position: relative;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.assistant-screen {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.assistant-screen[hidden] {
    display: none;
}

/* Pantalla 1 — bienvenida */
.assistant-screen-welcome {
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: var(--space-6);
    padding: var(--space-6);
}

.assistant-welcome-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.3rem;
    line-height: 1.4;
    color: var(--color-text);
}

/* Pantalla 2 — conversación (estructura lista para IA) */
.assistant-screen-conversation {
    padding: var(--space-5);
    gap: var(--space-4);
}

.assistant-messages {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.assistant-message {
    max-width: 85%;
    padding: 0.65rem 0.95rem;
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    line-height: 1.5;
}

.assistant-message-assistant {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border-light);
    color: var(--color-text-body);
}

.assistant-message-user {
    align-self: flex-end;
    background: rgba(0, 145, 255, 0.16);
    border: 1px solid rgba(0, 174, 239, 0.4);
    color: var(--color-text);
}

.assistant-input-row {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.assistant-input-field {
    flex: 1;
    margin-bottom: 0;
}

.assistant-send-btn {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-pill);
    color: var(--color-cyan);
    transition: color var(--duration-fast) ease, border-color var(--duration-fast) ease, background var(--duration-fast) ease;
}

.assistant-send-btn:hover {
    color: var(--color-text);
    border-color: rgba(0, 174, 239, 0.4);
    background: rgba(255, 255, 255, 0.075);
}

@media (max-width: 480px) {
    .assistant-panel {
        max-width: 100%;
    }

    .assistant-fab {
        right: var(--space-4);
        bottom: var(--space-4);
    }
}