/* =============================================================================
   IA Y APRENDIZAJE - Proyecto de Innovación Docente
   Universidad de Extremadura
   ============================================================================= */

:root {
    --azul-primario: #1A365D;
    --azul-claro: #2D4A7C;
    --azul-suave: #EBF4FF;
    --verde-primario: #38A169;
    --verde-claro: #48BB78;
    --verde-suave: #F0FFF4;
    --gris-fondo: #F7FAFC;
    --gris-claro: #E2E8F0;
    --gris-medio: #A0AEC0;
    --gris-oscuro: #4A5568;
    --blanco: #FFFFFF;
    --negro: #1A202C;
    --rojo-error: #E53E3E;
    --naranja-warning: #DD6B20;
    --azul-info: #3182CE;

    --sombra-suave: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --sombra-media: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
    --sombra-elevada: 0 20px 40px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.06);
    --radio-borde: 10px;
    --radio-grande: 16px;
    --transicion: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--negro);
    background-color: var(--gris-fondo);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--azul-primario);
    text-decoration: none;
    transition: var(--transicion);
}

a:hover {
    color: var(--verde-primario);
    text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    letter-spacing: -0.02em;
}

/* =============================================================================
   LAYOUT
   ============================================================================= */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =============================================================================
   NAVEGACION
   ============================================================================= */

.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--azul-primario);
    letter-spacing: -0.01em;
}

.navbar-brand:hover {
    text-decoration: none;
    color: var(--verde-primario);
}

.navbar-logo {
    font-size: 1.5rem;
}

.navbar-menu {
    display: flex;
    gap: 8px;
    list-style: none;
}

.navbar-menu a {
    color: var(--gris-oscuro);
    font-weight: 500;
    font-size: 0.925rem;
    padding: 8px 14px;
    border-radius: 8px;
    transition: var(--transicion);
    border-bottom: none;
}

.navbar-menu a:hover {
    color: var(--azul-primario);
    background: var(--gris-fondo);
    text-decoration: none;
}

.navbar-menu a.active {
    color: var(--verde-primario);
    background: var(--verde-suave);
    font-weight: 600;
}

.navbar-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

/* =============================================================================
   HERO SECTION
   ============================================================================= */

.hero {
    background: linear-gradient(135deg, #1A365D 0%, #2D4A7C 50%, #1e4d6e 100%);
    color: var(--blanco);
    padding: 90px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(56, 161, 105, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(49, 130, 206, 0.12) 0%, transparent 60%);
    pointer-events: none;
}

.hero > .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 2.75rem;
    margin-bottom: 20px;
    font-weight: 800;
    letter-spacing: -0.03em;
    text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.hero .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 650px;
    margin: 0 auto 45px;
    font-weight: 400;
    line-height: 1.7;
}

.hero-diagram {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radio-grande);
    padding: 32px;
    max-width: 550px;
    margin: 0 auto;
    backdrop-filter: blur(8px);
}

/* =============================================================================
   SECCIONES
   ============================================================================= */

.section {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--azul-primario);
    margin-bottom: 12px;
    font-weight: 700;
}

.section-title p {
    color: var(--gris-oscuro);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* =============================================================================
   TARJETAS
   ============================================================================= */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.cards-grid-2x2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.card {
    background: var(--blanco);
    border-radius: var(--radio-grande);
    box-shadow: var(--sombra-suave);
    padding: 28px;
    transition: var(--transicion);
    border: 1px solid rgba(0,0,0,0.04);
    position: relative;
}

.card:hover {
    box-shadow: var(--sombra-media);
    transform: translateY(-4px);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: inline-block;
}

.card h3 {
    color: var(--azul-primario);
    margin-bottom: 10px;
    font-size: 1.15rem;
    font-weight: 650;
}

.card p {
    color: var(--gris-oscuro);
    font-size: 0.95rem;
    line-height: 1.65;
}

.card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.card-link:hover {
    text-decoration: none;
}

.card-link .card {
    border-left: 4px solid transparent;
}

.card-link:hover .card {
    border-left-color: var(--verde-primario);
}

/* =============================================================================
   FORMULARIOS
   ============================================================================= */

.form-card {
    background: var(--blanco);
    border-radius: var(--radio-grande);
    box-shadow: var(--sombra-suave);
    padding: 32px;
    margin-bottom: 24px;
    border: 1px solid rgba(0,0,0,0.04);
}

.form-card h2 {
    color: var(--azul-primario);
    border-bottom: none;
    padding-bottom: 16px;
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 700;
    position: relative;
}

.form-card h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--verde-primario);
    border-radius: 3px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--azul-primario);
    font-size: 0.95rem;
}

.form-group label.required::after {
    content: " *";
    color: var(--rojo-error);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--gris-claro);
    border-radius: var(--radio-borde);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transicion);
    background: var(--blanco);
}

.form-control:focus {
    outline: none;
    border-color: var(--verde-primario);
    box-shadow: 0 0 0 4px rgba(56, 161, 105, 0.12);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

/* Opciones radio/checkbox */
.options-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 10px;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--gris-fondo);
    border-radius: var(--radio-borde);
    cursor: pointer;
    transition: var(--transicion);
    border: 2px solid transparent;
}

.option-item:hover {
    background: var(--gris-claro);
}

.option-item.selected {
    background: rgba(56, 161, 105, 0.08);
    border-color: var(--verde-primario);
}

.option-item input[type="radio"],
.option-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--verde-primario);
    cursor: pointer;
}

/* Escala Likert */
.likert-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.likert-table th {
    background: var(--azul-primario);
    color: var(--blanco);
    padding: 12px 8px;
    font-size: 0.8rem;
    text-align: center;
    font-weight: 500;
}

.likert-table th:first-child {
    text-align: left;
    width: 40%;
    border-radius: 8px 0 0 0;
}

.likert-table th:last-child {
    border-radius: 0 8px 0 0;
}

.likert-table td {
    padding: 15px 10px;
    border-bottom: 1px solid var(--gris-claro);
    vertical-align: middle;
}

.likert-table td:first-child {
    font-weight: 500;
}

.likert-table td:not(:first-child) {
    text-align: center;
}

.likert-table tr:hover {
    background: var(--gris-fondo);
}

.likert-table input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--verde-primario);
    cursor: pointer;
}

/* Escala numerica */
.numeric-scale {
    display: flex;
    justify-content: space-between;
    background: var(--gris-fondo);
    border-radius: var(--radio-borde);
    padding: 15px;
    margin-top: 10px;
}

.numeric-scale label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radio-borde);
    transition: var(--transicion);
}

.numeric-scale label:hover {
    background: var(--gris-claro);
}

.numeric-scale input[type="radio"] {
    width: 22px;
    height: 22px;
    accent-color: var(--verde-primario);
}

/* =============================================================================
   BOTONES
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border: 2px solid transparent;
    border-radius: var(--radio-borde);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: var(--transicion);
    gap: 8px;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--sombra-media);
}

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

.btn-primary {
    background: var(--verde-primario);
    border-color: var(--verde-primario);
    color: var(--blanco);
}

.btn-primary:hover {
    background: #2F8F5B;
    border-color: #2F8F5B;
    color: var(--blanco);
}

.btn-secondary {
    background: var(--azul-primario);
    border-color: var(--azul-primario);
    color: var(--blanco);
}

.btn-secondary:hover {
    background: var(--azul-claro);
    border-color: var(--azul-claro);
    color: var(--blanco);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--azul-primario);
    color: var(--azul-primario);
}

.btn-outline:hover {
    background: var(--azul-primario);
    color: var(--blanco);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-sm {
    padding: 8px 18px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.05rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* =============================================================================
   ALERTAS
   ============================================================================= */

.alert {
    padding: 16px 20px;
    border-radius: var(--radio-borde);
    margin-bottom: 20px;
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.6;
}

.alert-success {
    background: #F0FFF4;
    color: #22543D;
    border: 1px solid #9AE6B4;
}

.alert-error {
    background: #FFF5F5;
    color: #742A2A;
    border: 1px solid #FEB2B2;
}

.alert-warning {
    background: #FFFAF0;
    color: #744210;
    border: 1px solid #FBD38D;
}

.alert-info {
    background: #EBF8FF;
    color: #2A4365;
    border: 1px solid #90CDF4;
}

/* =============================================================================
   TABLAS
   ============================================================================= */

.table-container {
    overflow-x: auto;
    border-radius: var(--radio-borde);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--blanco);
    border-radius: var(--radio-borde);
    overflow: hidden;
    box-shadow: var(--sombra-suave);
}

.table th,
.table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--gris-claro);
}

.table th {
    background: var(--azul-primario);
    color: var(--blanco);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.table tr:hover {
    background: var(--gris-fondo);
}

.table tr:last-child td {
    border-bottom: none;
}

/* =============================================================================
   DASHBOARD
   ============================================================================= */

.dashboard-header {
    background: var(--blanco);
    padding: 28px;
    border-radius: var(--radio-grande);
    box-shadow: var(--sombra-suave);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(0,0,0,0.04);
}

.dashboard-header h1 {
    color: var(--azul-primario);
    font-size: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--verde-primario), var(--verde-claro));
    color: var(--blanco);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.15rem;
    box-shadow: 0 2px 8px rgba(56, 161, 105, 0.3);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--blanco);
    padding: 24px;
    border-radius: var(--radio-grande);
    text-align: center;
    box-shadow: var(--sombra-suave);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transicion);
}

.stat-card:hover {
    box-shadow: var(--sombra-media);
    transform: translateY(-2px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--verde-primario);
    letter-spacing: -0.03em;
}

.stat-label {
    color: var(--gris-oscuro);
    font-size: 0.875rem;
    margin-top: 4px;
    font-weight: 500;
}

.project-tool-card {
    background:
        radial-gradient(circle at top right, rgba(56, 161, 105, 0.15), transparent 35%),
        linear-gradient(135deg, #17314f 0%, #204a70 58%, #2a5f6f 100%);
    color: var(--blanco);
    padding: 28px;
    border-radius: var(--radio-grande);
    box-shadow: var(--sombra-media);
    margin-bottom: 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.project-tool-card h2 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.project-tool-card p {
    max-width: 720px;
    opacity: 0.9;
}

.project-tool-eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.78;
    margin-bottom: 10px;
}

.project-tool-actions {
    flex-shrink: 0;
}

.project-tool-card .btn {
    box-shadow: none;
}

.project-tool-card .btn-secondary {
    background: var(--blanco);
    border-color: var(--blanco);
    color: var(--azul-primario);
}

.project-tool-card .btn-secondary:hover {
    background: var(--verde-suave);
    border-color: var(--verde-suave);
    color: var(--azul-primario);
}

/* =============================================================================
   PAGINAS ESPECIFICAS
   ============================================================================= */

/* Login */
.login-container {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.login-box {
    background: var(--blanco);
    border-radius: var(--radio-grande);
    box-shadow: var(--sombra-media);
    padding: 44px;
    width: 100%;
    max-width: 440px;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.04);
}

.login-box h1 {
    color: var(--azul-primario);
    margin-bottom: 10px;
}

.login-box .subtitle {
    color: var(--gris-oscuro);
    margin-bottom: 30px;
}

/* Recursos */
.resource-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--blanco);
    border-radius: var(--radio-borde);
    box-shadow: var(--sombra-suave);
    margin-bottom: 12px;
    transition: var(--transicion);
    border: 1px solid rgba(0,0,0,0.04);
}

.resource-card:hover {
    box-shadow: var(--sombra-media);
    transform: translateX(4px);
    border-color: var(--verde-primario);
}

.resource-icon {
    font-size: 2.2rem;
    flex-shrink: 0;
}

.resource-info {
    flex: 1;
}

.resource-info h3 {
    color: var(--azul-primario);
    margin-bottom: 4px;
    font-size: 1.05rem;
}

.resource-info p {
    color: var(--gris-oscuro);
    font-size: 0.9rem;
}

.resource-card .btn {
    flex-shrink: 0;
    white-space: nowrap;
    margin-left: auto;
}

.form-hero-card {
    background:
        radial-gradient(circle at top left, rgba(56, 161, 105, 0.2), transparent 35%),
        linear-gradient(135deg, #17314f 0%, #244c72 55%, #295b67 100%);
    color: var(--blanco);
    border-radius: 24px;
    padding: 32px;
    margin-bottom: 26px;
    box-shadow: var(--sombra-media);
}

.form-hero-card h1 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.form-hero-card p {
    max-width: 760px;
    opacity: 0.92;
}

.form-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.form-badge {
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(255,255,255,0.14);
    border: 1px solid rgba(255,255,255,0.18);
    font-size: 0.85rem;
    font-weight: 600;
}

.instrument-intro {
    background: var(--gris-fondo);
    border: 1px solid var(--gris-claro);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 18px;
}

.instrument-intro h3 {
    color: var(--azul-primario);
    margin-bottom: 10px;
    font-size: 1.05rem;
}

.instrument-intro ul {
    margin: 0;
    padding-left: 18px;
    color: var(--gris-oscuro);
}

.instrument-intro li + li {
    margin-top: 6px;
}

.instrument-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.mini-note {
    color: var(--gris-oscuro);
    font-size: 0.88rem;
    margin-top: 10px;
}

.table-note {
    font-size: 0.85rem;
    color: var(--gris-oscuro);
    margin-bottom: 12px;
}

.validation-status {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 22px;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gris-fondo);
    border: 1px solid var(--gris-claro);
    border-radius: 999px;
    padding: 10px 16px;
    font-size: 0.9rem;
    color: var(--azul-primario);
    font-weight: 600;
}

.status-pill strong {
    color: var(--verde-primario);
}

/* Secciones condicionales */
.conditional-section {
    display: none;
    padding: 20px;
    background: var(--gris-fondo);
    border-radius: var(--radio-borde);
    border: 2px dashed var(--gris-claro);
    margin-top: 15px;
}

.conditional-section.active {
    display: block;
}

/* Details/FAQ */
details {
    transition: var(--transicion);
}

details[open] summary {
    color: var(--verde-primario);
}

details summary {
    transition: var(--transicion);
}

details summary:hover {
    color: var(--verde-primario);
}

/* Blockquote */
blockquote {
    border-left: 4px solid var(--verde-primario);
    padding: 16px 24px;
    margin: 20px 0;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--gris-oscuro);
    background: var(--verde-suave);
    border-radius: 0 var(--radio-borde) var(--radio-borde) 0;
}

/* =============================================================================
   FOOTER
   ============================================================================= */

.footer {
    background: var(--azul-primario);
    color: var(--blanco);
    padding: 48px 0 32px;
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    transition: var(--transicion);
    font-size: 0.925rem;
    font-weight: 500;
}

.footer-links a:hover {
    color: var(--blanco);
    text-decoration: none;
}

.footer-copy {
    width: 100%;
    text-align: center;
    padding-top: 24px;
    margin-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.875rem;
    opacity: 0.7;
}

/* =============================================================================
   UTILIDADES
   ============================================================================= */

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.hidden { display: none; }

/* =============================================================================
   RESPONSIVE
   ============================================================================= */

@media (max-width: 768px) {
    .navbar-toggle {
        display: block;
    }

    .navbar-content {
        flex-wrap: wrap;
    }

    .navbar-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding: 12px 0;
        border-top: 1px solid var(--gris-claro);
        margin-top: 12px;
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-menu a {
        padding: 12px 14px;
        border-radius: 8px;
    }

    .navbar-menu li:last-child a {
        border-bottom: none;
    }

    .hero {
        padding: 60px 0 50px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero .subtitle {
        font-size: 1rem;
    }

    .section {
        padding: 45px 0;
    }

    .section-title {
        margin-bottom: 35px;
    }

    .section-title h2 {
        font-size: 1.6rem;
    }

    .form-card {
        padding: 24px;
    }

    .dashboard-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
        padding: 22px;
    }

    .likert-table {
        font-size: 0.85rem;
    }

    .likert-table th {
        padding: 8px 4px;
        font-size: 0.7rem;
    }

    .numeric-scale {
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .resource-card {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .cards-grid {
        gap: 16px;
    }

    .cards-grid-2x2 {
        grid-template-columns: 1fr;
    }

    .project-tool-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .form-hero-card {
        padding: 24px;
    }

    .form-hero-card h1 {
        font-size: 1.6rem;
    }
}

/* =============================================================================
   DIAGRAMA CROSSOVER (SVG-like con CSS)
   ============================================================================= */

.crossover-diagram {
    display: flex;
    justify-content: center;
    gap: 50px;
    padding: 16px;
}

.group-column {
    text-align: center;
}

.group-label {
    background: rgba(255,255,255,0.18);
    padding: 10px 28px;
    border-radius: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.reto-box {
    padding: 14px 28px;
    border-radius: 10px;
    margin: 10px 0;
    font-weight: 600;
    font-size: 0.95rem;
}

.reto-sin-ia {
    background: rgba(255,255,255,0.92);
    color: var(--azul-primario);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.reto-con-ia {
    background: var(--verde-primario);
    color: var(--blanco);
    box-shadow: 0 2px 8px rgba(56, 161, 105, 0.3);
}

.arrow-down {
    font-size: 1.5rem;
    opacity: 0.6;
}

.diagram-note {
    margin-top: 20px;
    font-style: italic;
    opacity: 0.85;
    font-size: 0.9rem;
}

/* =============================================================================
   HAMBURGER MENU
   ============================================================================= */

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    padding: 6px 8px;
    color: var(--azul-primario);
    border-radius: 8px;
    transition: var(--transicion);
}

.navbar-toggle:hover {
    background: var(--gris-fondo);
}

/* =============================================================================
   LOADING SPINNER
   ============================================================================= */

.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--gris-claro);
    border-top-color: var(--verde-primario);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 40px;
    color: var(--gris-oscuro);
}