:root {
    --bg-dark: #222222;
    --bg-box: #1a1a1a;
    --yellow-krow: #ffcc00; /* Amarillo exacto de tu logo/boceto */
    --yellow-hover: #e6b800;
    --orange-privacy: #b33613; /* Color óxido/naranja de privacidad */
    --text-white: #ffffff;
    --text-muted: #aaaaaa;
    --success-green: #00cc66;
    --success-hover: #00b359;
}

/* 1. CAMBIO DE FUENTE GENERAL: Más limpia, estilizada y moderna */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    letter-spacing: 0.5px;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* NAVBAR */
.navbar {
    background-color: var(--bg-box);
    padding: 15px 40px;
    border-bottom: 2px solid #333;
}

.brand-logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: #000;
    background-color: var(--yellow-krow);
    padding: 6px 22px;
    text-decoration: none;
    display: inline-block;
    text-transform: uppercase;
    border-radius: 4px;
    transition: transform 0.2s ease;
}
.brand-logo:hover {
    transform: scale(1.03);
}

/* CONTENEDOR DE PANTALLAS */
.main-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 2. ANIMACIÓN DE ENTRADA PARA LAS PANTALLAS (Fade In suave) */
.screen {
    display: none;
    width: 100%;
}

.screen.active {
    display: block;
    animation: fadeInPantalla 0.5s ease forwards;
}

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

/* 3. BOTONES GENERALES OPTIMIZADOS (Menos toscos y con transiciones) */
.btn-yellow {
    background-color: var(--yellow-krow);
    color: #000;
    border: none;
    padding: 14px 28px;
    font-size: 1.05rem;
    cursor: pointer;
    font-weight: 700;
    text-decoration: none;
    display: inline-block;
    border-radius: 6px;
    text-transform: uppercase;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-yellow:hover { 
    background-color: var(--yellow-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 204, 0, 0.2);
}

.btn-secondary {
    background-color: #333;
    color: #eee;
    border: 1px solid #444;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.25s ease;
}
.btn-secondary:hover { 
    background-color: #444;
    color: #fff;
    transform: translateY(-2px);
}

.btn-success {
    background-color: var(--success-green);
    color: #000;
    border: none;
    padding: 16px 36px;
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 6px;
    text-transform: uppercase;
    transition: all 0.25s ease;
}
.btn-success:hover {
    background-color: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 204, 102, 0.2);
}

/* DISEÑO DE PANTALLA INICIO (SPLIT) */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    margin-bottom: 30px;
}

.left-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.privacy-box {
    background-color: var(--orange-privacy);
    padding: 35px;
    font-size: 1.25rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.5;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.donation-pitch p {
    color: var(--text-muted);
    margin-bottom: 15px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.right-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
}

.tool-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--text-white);
}

/* ZONA DE ARRASTRE MEJORADA */
.drop-zone {
    width: 100%;
    border: 2px dashed #444;
    padding: 60px 30px;
    text-align: center;
    background-color: var(--bg-box);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.drop-zone.drag-over {
    border-color: var(--yellow-krow);
    background-color: #222225;
    transform: scale(1.01);
}

.drag-text {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ESPACIOS DE PUBLICIDAD */
.ad-space-banner, .ad-space-large {
    width: 100%;
    height: 90px;
    background-color: #161616;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px dashed #333;
    border-radius: 6px;
}
.ad-space-large {
    max-width: 728px;
    margin-top: 25px;
}
.ad-placeholder {
    color: #444;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* PANTALLA DE CARGA */
.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 25px;
}

.spinner {
    width: 55px;
    height: 55px;
    border: 4px solid #333;
    border-top: 4px solid var(--yellow-krow);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.did-you-know-box {
    background-color: var(--bg-box);
    padding: 30px;
    max-width: 620px;
    border-left: 4px solid var(--yellow-krow);
    text-align: left;
    border-radius: 0 8px 8px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.did-you-know-box h3 {
    margin-bottom: 12px;
    color: var(--yellow-krow);
    font-size: 1.3rem;
    font-weight: 700;
}

.did-you-know-box p {
    line-height: 1.6;
    color: #dddddd;
    font-size: 1rem;
}

/* PANTALLA RESULTADOS */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 2px solid #333;
    padding-bottom: 15px;
}

.results-header h2 {
    font-weight: 600;
    font-size: 1.5rem;
}

/* CUADRÍCULA DE MINIATURAS ANIMADA */
.grid-preview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
    max-height: 50vh;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--bg-box);
    border-radius: 8px;
    border: 1px solid #2a2a2a;
}

/* Animación individual para cuando aparecen las miniaturas */
.grid-preview > div {
    animation: fadeInThumbnail 0.4s ease forwards;
}

@keyframes fadeInThumbnail {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.results-footer-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    border-top: 2px solid #333;
    padding-top: 25px;
}

.clickable-label {
    display: inline-block;
}

/* RESPONSIVO (MÓVILES) */
@media (max-width: 768px) {
    .split-layout { grid-template-columns: 1fr; gap: 35px; }
    .tool-title { font-size: 2.5rem; text-align: center; }
    .navbar { padding: 15px 20px; }
}