/* ===== GOOGLE FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@300;400;500;600;700;800&family=Merriweather:wght@400;700&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
    --azul-oscuro: #1a2a3a;
    --azul-medio: #1e3a5f;
    --azul-institucional: #2c5282;
    --azul-claro: #3b82c4;
    --azul-hover: #4a9ade;
    --azul-suave: #e8f0fa;
    --gris-900: #1a1d21;
    --gris-800: #2d3239;
    --gris-700: #3d434b;
    --gris-600: #555d68;
    --gris-500: #6b7280;
    --gris-400: #9ca3af;
    --gris-300: #c7cbd1;
    --gris-200: #e2e5e9;
    --gris-100: #f1f3f5;
    --gris-50: #f8f9fb;
    --blanco: #ffffff;
    --dorado: #c9a84c;
    --dorado-suave: #e8d9a0;
    --exito: #0f7b3f;
    --exito-bg: #e6f5ed;
    --peligro: #b91c1c;
    --peligro-bg: #fee2e2;
    --advertencia: #92600a;
    --advertencia-bg: #fef3c7;
    --sombra-sm: 0 1px 3px rgba(0,0,0,0.08);
    --sombra-md: 0 4px 12px rgba(0,0,0,0.1);
    --sombra-lg: 0 8px 30px rgba(0,0,0,0.12);
    --sombra-xl: 0 16px 48px rgba(0,0,0,0.14);
    --radio-sm: 6px;
    --radio-md: 10px;
    --radio-lg: 14px;
    --transicion: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ===== BODY ===== */
body {
    font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gris-100);
    color: var(--gris-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== HEADER INSTITUCIONAL ===== */
.header-institucional {
    background: linear-gradient(180deg, var(--azul-oscuro) 0%, var(--azul-medio) 100%);
    color: var(--blanco);
    box-shadow: 0 2px 12px rgba(0,0,0,0.25);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 32px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.header-logos {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-logos img:hover {
    transform: scale(1.08);
}

.header-titles {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.header-titles .universidad {
    font-family: 'Merriweather', Georgia, serif;
    font-size: 0.72em;
    font-weight: 400;
    color: var(--dorado);
    letter-spacing: 1.8px;
    text-transform: uppercase;
    line-height: 1.3;
}

.header-titles .division {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 1.05em;
    font-weight: 700;
    color: var(--blanco);
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.header-titles .carrera {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 0.82em;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    letter-spacing: 0.3px;
    line-height: 1.3;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-badge {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.78em;
    font-weight: 600;
    letter-spacing: 0.8px;
    color: var(--dorado-suave);
    text-transform: uppercase;
}

/* ===== NAV BAR ===== */
.nav-bar {
    background: var(--azul-institucional);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.nav-bar ul {
    display: flex;
    list-style: none;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 32px;
    gap: 0;
}

.nav-bar ul li {
    background: none;
    padding: 0;
    margin: 0;
    border-radius: 0;
    border-left: none;
    font-weight: normal;
}

.nav-bar ul li:hover {
    background: none;
    transform: none;
}

.nav-bar li a {
    display: block;
    padding: 12px 24px;
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all var(--transicion);
    border-bottom: 3px solid transparent;
    position: relative;
}

.nav-bar li a:hover,
.nav-bar li a.active {
    color: var(--blanco);
    background: rgba(255,255,255,0.12);
    border-bottom-color: var(--dorado);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

/* ===== CONTAINER (CARD) ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--blanco);
    padding: 40px 44px;
    border-radius: var(--radio-lg);
    box-shadow: var(--sombra-lg);
    border: 1px solid var(--gris-200);
}

/* ===== PAGE HEADER ===== */
.page-header {
    text-align: center;
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--gris-200);
}

.page-header h1 {
    font-family: 'Merriweather', Georgia, serif;
    font-size: 1.75em;
    font-weight: 700;
    color: var(--azul-oscuro);
    margin-bottom: 6px;
    letter-spacing: -0.3px;
}

.page-header p {
    color: var(--gris-500);
    font-size: 0.95em;
}

/* ===== TITLES ===== */
h1 {
    font-family: 'Merriweather', Georgia, serif;
    margin-bottom: 20px;
    color: var(--azul-oscuro);
    text-align: center;
    font-size: 1.65em;
    letter-spacing: -0.3px;
}

h2 {
    margin-bottom: 20px;
    color: var(--azul-medio);
    text-align: center;
    font-size: 1.3em;
    font-weight: 700;
}

h3 {
    margin: 32px 0 16px;
    color: var(--azul-institucional);
    font-size: 1.15em;
    font-weight: 700;
    border-bottom: 2px solid var(--azul-suave);
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== FORMS ===== */
form {
    margin-top: 16px;
}

label {
    font-weight: 600;
    color: var(--gris-700);
    font-size: 0.92em;
}

input[type="text"],
input[type="number"],
select {
    padding: 10px 14px;
    margin: 4px 8px 4px 0;
    border: 1.5px solid var(--gris-300);
    border-radius: var(--radio-sm);
    min-width: 180px;
    font-family: 'Source Sans 3', sans-serif;
    font-size: 0.92em;
    color: var(--gris-800);
    background: var(--blanco);
    transition: all var(--transicion);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--azul-claro);
    box-shadow: 0 0 0 3px rgba(59, 130, 196, 0.12);
    background: var(--blanco);
}

input[type="text"]::placeholder,
input[type="number"]::placeholder {
    color: var(--gris-400);
}

/* ===== BUTTONS ===== */
button,
.btn {
    background: var(--azul-institucional);
    color: var(--blanco);
    border: none;
    padding: 12px 28px;
    border-radius: var(--radio-sm);
    font-weight: 600;
    font-size: 0.9em;
    font-family: 'Source Sans 3', sans-serif;
    cursor: pointer;
    transition: all var(--transicion);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    box-shadow: var(--sombra-sm);
    letter-spacing: 0.2px;
}

button:hover,
.btn:hover {
    background: var(--azul-claro);
    transform: translateY(-1px);
    box-shadow: var(--sombra-md);
}

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

a.btn {
    background: var(--azul-medio);
}

a.btn:hover {
    background: var(--azul-claro);
}

.btn-success {
    background: var(--exito);
}

.btn-success:hover {
    background: #0a6331;
}

.btn-container {
    text-align: center;
    margin-top: 28px;
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== TABLES ===== */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 20px 0;
    border-radius: var(--radio-md);
    overflow: hidden;
    box-shadow: var(--sombra-sm);
    border: 1px solid var(--gris-200);
}

th, td {
    padding: 12px 14px;
    text-align: center;
    border: none;
}

th {
    background: var(--azul-medio);
    color: var(--blanco);
    font-weight: 600;
    font-size: 0.82em;
    letter-spacing: 0.6px;
    text-transform: uppercase;
}

tr {
    transition: background var(--transicion);
}

tbody tr:nth-child(even) {
    background: var(--gris-50);
}

tbody tr:hover {
    background: var(--azul-suave);
}

td {
    color: var(--gris-700);
    border-bottom: 1px solid var(--gris-200);
    font-size: 0.93em;
}

/* ===== HIGHLIGHTED FIRST ROW (ranking) ===== */
.result-table tbody tr:first-child {
    background: #dbeafe;
    font-weight: 600;
}

.result-table tbody tr:first-child td {
    color: var(--azul-oscuro);
}

/* ===== MATRIX TABLE ===== */
.matrix-table input {
    width: 68px;
    text-align: center;
    border: 1.5px solid var(--gris-300);
    border-radius: var(--radio-sm);
    padding: 7px 4px;
    font-size: 0.88em;
    font-family: 'Source Sans 3', sans-serif;
    transition: border-color var(--transicion);
}

.matrix-table input:focus {
    border-color: var(--azul-claro);
    box-shadow: 0 0 0 2px rgba(59, 130, 196, 0.15);
}

/* ===== TABLE WRAPPER (horizontal scroll) ===== */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radio-md);
    box-shadow: var(--sombra-sm);
    margin: 20px 0;
    border: 1px solid var(--gris-200);
}

.table-wrapper table {
    box-shadow: none;
    margin: 0;
    min-width: 500px;
    border: none;
}

.matrix-table th {
    font-size: 0.75em;
    padding: 10px 8px;
    white-space: nowrap;
}

.matrix-table td {
    padding: 8px 6px;
}

/* ===== LISTS ===== */
ul {
    list-style: none;
    padding-left: 0;
    margin: 12px 0;
}

ul li {
    background: var(--gris-50);
    padding: 12px 18px;
    margin-bottom: 6px;
    border-radius: var(--radio-sm);
    border-left: 3px solid var(--azul-institucional);
    font-weight: 500;
    font-size: 0.93em;
    color: var(--gris-700);
    transition: all var(--transicion);
}

ul li:hover {
    background: var(--azul-suave);
    transform: translateX(3px);
}

/* ===== SEPARATOR ===== */
hr {
    margin: 36px 0;
    border: none;
    border-top: 1.5px solid var(--gris-200);
}

/* ===== FLASH MESSAGES ===== */
.flash-messages {
    max-width: 1200px;
    margin: 0 auto 20px;
    padding: 0 24px;
}

.flash {
    padding: 14px 20px;
    border-radius: var(--radio-sm);
    margin-bottom: 10px;
    font-weight: 500;
    font-size: 0.92em;
    display: flex;
    align-items: center;
    gap: 8px;
    border-left: 4px solid;
}

.flash-error,
.flash-danger {
    background: var(--peligro-bg);
    color: var(--peligro);
    border-color: var(--peligro);
}

.flash-success {
    background: var(--exito-bg);
    color: var(--exito);
    border-color: var(--exito);
}

.flash-warning {
    background: var(--advertencia-bg);
    color: var(--advertencia);
    border-color: var(--advertencia);
}

.flash-info {
    background: var(--azul-suave);
    color: var(--azul-institucional);
    border-color: var(--azul-institucional);
}

/* ===== RESULT TABLE ===== */
.result-table {
    width: 85%;
    margin: 24px auto;
}

.result-table th {
    background: var(--azul-institucional);
}

/* ===== FORM ROWS ===== */
.criterio-row,
.form-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.criterio-row label,
.form-row label {
    min-width: 150px;
    font-weight: 600;
    font-size: 0.92em;
}

/* ===== SMALL BUTTONS ===== */
.btn-small {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    margin: 0 3px;
    font-size: 0.82em;
    border-radius: var(--radio-sm);
    text-decoration: none;
    color: var(--blanco);
    background: var(--azul-institucional);
    transition: all var(--transicion);
    border: none;
    cursor: pointer;
    font-weight: 600;
}

.btn-small:hover {
    background: var(--azul-claro);
    transform: translateY(-1px);
    box-shadow: var(--sombra-sm);
}

.btn-danger {
    background: var(--peligro) !important;
}

.btn-danger:hover {
    background: #991b1b !important;
    box-shadow: 0 2px 8px rgba(185, 28, 28, 0.3);
}

/* ===== SAVE FORM ===== */
.save-form {
    background: var(--gris-50);
    padding: 30px 32px;
    border-radius: var(--radio-md);
    border: 1px solid var(--gris-200);
    border-left: 4px solid var(--azul-institucional);
    margin-top: 20px;
}

.save-form h2 {
    color: var(--azul-institucional);
    margin-bottom: 24px;
    text-align: center;
}

.save-form input,
.save-form select {
    width: 100%;
    max-width: 420px;
}

/* ===== INFO CARD ===== */
.info-card {
    background: var(--gris-50);
    padding: 24px 28px;
    border-radius: var(--radio-md);
    border-left: 4px solid var(--azul-institucional);
    margin-bottom: 28px;
    border: 1px solid var(--gris-200);
    border-left: 4px solid var(--azul-institucional);
}

.info-card p {
    margin: 8px 0;
    font-size: 0.95em;
    color: var(--gris-700);
}

.info-card strong {
    color: var(--azul-oscuro);
    margin-right: 8px;
    font-weight: 700;
}

/* ===== ERROR BOX ===== */
.error-box {
    text-align: center;
    padding: 56px 40px;
    background: var(--peligro-bg);
    border-radius: var(--radio-lg);
    border: 2px solid #fca5a5;
}

.error-box h1 {
    color: var(--peligro);
    font-size: 2em;
    margin-bottom: 16px;
}

.error-message {
    font-size: 1.1em;
    color: var(--gris-700);
    margin: 16px 0;
    line-height: 1.7;
}

/* ===== ESCALA AHP LEGEND ===== */
.escala-info {
    background: var(--azul-suave);
    padding: 16px 20px;
    border-radius: var(--radio-sm);
    margin-bottom: 20px;
    font-size: 0.88em;
    color: var(--azul-medio);
    border: 1px solid #b6d4f0;
    line-height: 1.7;
}

.escala-info strong {
    color: var(--azul-oscuro);
}

/* ===== STEP INDICATOR ===== */
.step-indicator {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 32px;
}

.step {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.82em;
    font-weight: 600;
    color: var(--gris-400);
    position: relative;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.step::after {
    content: '';
    position: absolute;
    right: -8px;
    width: 16px;
    height: 16px;
    border-right: 2px solid var(--gris-300);
    border-bottom: 2px solid var(--gris-300);
    transform: rotate(-45deg);
}

.step:last-child::after {
    display: none;
}

.step.active {
    color: var(--azul-institucional);
}

.step .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gris-200);
    color: var(--gris-500);
    font-weight: 700;
    font-size: 0.85em;
}

.step.active .step-num {
    background: var(--azul-institucional);
    color: var(--blanco);
}

.step.done .step-num {
    background: var(--exito);
    color: var(--blanco);
}

.step.done {
    color: var(--exito);
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gris-500);
}

.empty-state .icon {
    font-size: 2.5em;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.95em;
}

/* ===== SECTION CARD ===== */
.section-card {
    background: var(--gris-50);
    border: 1px solid var(--gris-200);
    border-radius: var(--radio-md);
    padding: 28px 32px;
    margin-bottom: 24px;
}

.section-card h2 {
    text-align: left;
    color: var(--azul-oscuro);
    font-size: 1.2em;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--azul-oscuro);
    color: rgba(255,255,255,0.5);
    text-align: center;
    padding: 16px 24px;
    font-size: 0.78em;
    letter-spacing: 0.3px;
    margin-top: auto;
}

.footer a {
    color: var(--dorado-suave);
    text-decoration: none;
}

.footer a:hover {
    color: var(--dorado);
}

/* ===== LOGO OBJECT FIT ===== */
.header-logos img {
    height: 52px;
    width: 52px;
    border-radius: 50%;
    border: 2px solid rgba(201, 168, 76, 0.4);
    transition: transform var(--transicion);
    object-fit: cover;
}

/* ===== AHP EXAMPLE TOGGLE ===== */
.ejemplo-ahp {
    background: var(--gris-50);
    border: 1px solid var(--gris-200);
    border-radius: var(--radio-sm);
    margin-bottom: 24px;
    overflow: hidden;
}

.ejemplo-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    color: var(--azul-medio);
    font-size: 0.92em;
    transition: background var(--transicion);
    user-select: none;
}

.ejemplo-toggle:hover {
    background: var(--azul-suave);
}

.toggle-icon {
    font-size: 0.75em;
    transition: transform var(--transicion);
}

.ejemplo-ahp.open .toggle-icon {
    transform: rotate(180deg);
}

.ejemplo-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 20px;
}

.ejemplo-ahp.open .ejemplo-content {
    max-height: 600px;
    padding: 0 20px 20px;
}

.ejemplo-content p {
    margin: 6px 0;
    font-size: 0.9em;
    color: var(--gris-700);
    line-height: 1.6;
}

.example-table {
    width: auto;
    margin: 12px auto;
    font-size: 0.9em;
}

.example-table th {
    background: var(--azul-institucional);
    padding: 8px 16px;
    font-size: 0.85em;
}

.example-table td {
    padding: 8px 16px;
    font-family: 'Source Sans 3', monospace;
    font-weight: 600;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .header-top {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .header-logos img {
        height: 40px;
        width: 40px;
    }

    .header-titles .universidad {
        font-size: 0.62em;
    }

    .header-titles .division {
        font-size: 0.88em;
    }

    .header-titles .carrera {
        font-size: 0.72em;
    }

    .header-badge {
        display: none;
    }

    .nav-bar ul {
        padding: 0 12px;
        flex-wrap: wrap;
    }

    .nav-bar li a {
        padding: 10px 14px;
        font-size: 0.82em;
    }

    .main-content {
        padding: 20px 12px 36px;
    }

    .container {
        padding: 24px 20px;
    }

    .step-indicator {
        flex-wrap: wrap;
        gap: 4px;
    }

    .step::after {
        display: none;
    }

    table {
        font-size: 0.88em;
    }

    th, td {
        padding: 10px 8px;
    }

    .result-table {
        width: 100%;
    }

    .criterio-row,
    .form-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .criterio-row label,
    .form-row label {
        min-width: auto;
    }

    .btn-container {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .header-logos img {
        height: 34px;
        width: 34px;
    }

    .header-titles .universidad {
        font-size: 0.55em;
    }

    .header-titles .division {
        font-size: 0.78em;
    }

    .header-titles .carrera {
        font-size: 0.65em;
    }

    .container {
        padding: 18px 14px;
    }
}

/* ===== VALIDACIÓN INLINE - ERRORES HTML ===== */
.input-error {
    border: 2px solid var(--peligro) !important;
    background: var(--peligro-bg) !important;
    animation: sacudir 0.3s ease;
}

@keyframes sacudir {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.ahp-error-msg {
    color: var(--peligro);
    font-size: 0.72em;
    font-weight: 600;
    margin-top: 3px;
    line-height: 1.2;
    white-space: nowrap;
}

.ahp-error-banner {
    background: var(--peligro-bg);
    color: var(--peligro);
    border: 1.5px solid var(--peligro);
    border-radius: var(--radio-sm, 6px);
    padding: 12px 18px;
    margin: 12px 0;
    font-weight: 600;
    font-size: 0.95em;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.topsis-cell {
    position: relative;
}