/* ============================================================================
   ESTILOS GENERALES - APPLE FUTURISTA MINIMALISTA
   ============================================================================ */

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

:root {
    --color-primary: #5b7fff;
    --color-secondary: #6dd5ff;
    --color-accent: #ff6b9d;
    --color-tertiary: #a78bfa;
    --color-dark-bg: #0a0a0a;
    --color-dark-bg-secondary: #141414;
    --color-dark-card: #1f1f1f;
    --color-text-primary: #f5f5f5;
    --color-text-secondary: #b3b3b3;
    --color-success: #4ade80;
    --color-warning: #fbbf24;
    --color-danger: #ff6b6b;
    --spacing: 1rem;
    --border-radius: 16px;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-main);
    background: #0a0a0a;
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    font-weight: 400;
    letter-spacing: 0.3px;
}

/* ============================================================================
   LOGIN PAGE
   ============================================================================ */

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #0a0a0a;
    padding: var(--spacing);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(91, 127, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    top: -150px;
    left: -150px;
    animation: float 10s ease-in-out infinite;
}

.login-container::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(109, 213, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    bottom: -100px;
    right: -100px;
    animation: float 12s ease-in-out infinite reverse;
}

.login-box {
    background: rgba(31, 31, 31, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    animation: slideIn 0.6s ease-out;
    position: relative;
    z-index: 10;
    backdrop-filter: blur(20px);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0px);
    }
    50% {
        transform: translate(30px, 30px);
    }
}

.logo {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo h1 {
    font-size: 2.2rem;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.6rem;
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    font-family: var(--font-main);
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--color-text-primary);
}

.form-group input::placeholder {
    color: var(--color-text-secondary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(91, 127, 255, 0.4);
    background-color: rgba(255, 255, 255, 0.05);
}

.form-group small {
    display: block;
    color: var(--color-text-secondary);
    margin-top: 0.4rem;
    font-size: 0.85rem;
}

.error-message {
    background-color: rgba(255, 107, 107, 0.08);
    color: #ff8888;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 107, 107, 0.15);
    font-size: 0.9rem;
}

.info-box {
    background: rgba(91, 127, 255, 0.05);
    padding: 1.3rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(91, 127, 255, 0.12);
}

.info-box h3 {
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.info-box ul {
    list-style: none;
    font-size: 0.9rem;
}

.info-box li {
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.footer-info {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
}

hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin: 1.5rem 0;
}

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

.btn {
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: var(--font-main);
    display: inline-block;
    text-align: center;
    letter-spacing: 0.3px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, #5b7fff 0%, #7b9cff 100%);
    color: white;
    width: 100%;
    border: none;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(91, 127, 255, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-secondary);
    border: 1px solid rgba(109, 213, 255, 0.2);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(109, 213, 255, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #4ade80 0%, #6ee7b7 100%);
    color: #0a0a0a;
    border: none;
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(74, 222, 128, 0.2);
}

.btn-warning {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #0a0a0a;
    border: none;
}

.btn-warning:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(251, 191, 36, 0.2);
}

.btn-pequeño {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* ============================================================================
   EXAMEN PAGE
   ============================================================================ */

.examen-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: #0a0a0a;
}

.examen-header {
    background: rgba(31, 31, 31, 0.3);
    padding: 1.3rem 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.header-left h2 {
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
    font-weight: 600;
    font-size: 1.4rem;
}

.header-left p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.timer-box {
    text-align: center;
}

.timer {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-secondary);
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
}

.timer-box p {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.examen-content {
    display: flex;
    flex: 1;
    gap: 2rem;
    padding: 2rem;
    overflow: hidden;
}

.problema-selector {
    width: 180px;
    background: rgba(31, 31, 31, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius);
    padding: 1.3rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    backdrop-filter: blur(10px);
}

.problema-selector h3 {
    color: var(--color-text-primary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.problema-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.problema-btn {
    padding: 0.7rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    transition: all 0.25s ease;
    font-weight: 500;
    color: var(--color-text-primary);
    font-size: 0.9rem;
}

.problema-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(91, 127, 255, 0.2);
}

.problema-btn.active {
    background: rgba(91, 127, 255, 0.12);
    color: var(--color-secondary);
    border-color: rgba(91, 127, 255, 0.3);
}

.problema-btn .numero {
    font-weight: 600;
    width: 25px;
    text-align: center;
}

.problema-btn .status {
    margin-left: auto;
}

.progress-box {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.progress-box p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.problema-area {
    flex: 1;
    background: rgba(31, 31, 31, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    backdrop-filter: blur(10px);
}

.problema-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 1rem;
}

.problema-header h3 {
    color: var(--color-text-primary);
    font-size: 1.2rem;
    font-weight: 600;
}

.puntos {
    background: rgba(91, 127, 255, 0.15);
    color: var(--color-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(91, 127, 255, 0.25);
}

.enunciado-box {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.3rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(91, 127, 255, 0.1);
}

.enunciado-box h4 {
    color: var(--color-text-primary);
    margin-bottom: 0.7rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.enunciado-box p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.respuesta-box {
    margin-bottom: 1.5rem;
}

.respuesta-box label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.6rem;
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

.respuesta-box input {
    width: 200px;
    padding: 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-primary);
    transition: all 0.25s ease;
}

.respuesta-box input::placeholder {
    color: var(--color-text-secondary);
}

.respuesta-box input:focus {
    outline: none;
    border-color: rgba(91, 127, 255, 0.4);
    background: rgba(255, 255, 255, 0.05);
}

.respuesta-box small {
    display: block;
    color: var(--color-text-secondary);
    margin-top: 0.4rem;
    font-size: 0.85rem;
}

.examen-footer {
    background: rgba(31, 31, 31, 0.3);
    padding: 1.3rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
}

.examen-footer small {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ============================================================================
   MODAL
   ============================================================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: rgba(31, 31, 31, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    max-width: 500px;
    width: 90%;
    animation: slideIn 0.3s ease-out;
    backdrop-filter: blur(20px);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: var(--color-text-primary);
    font-weight: 600;
}

.close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color 0.25s ease;
}

.close:hover {
    color: var(--color-text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.file-upload {
    position: relative;
    margin-bottom: 1rem;
}

.file-upload input {
    display: none;
}

.file-label {
    display: block;
    padding: 2rem;
    border: 2px dashed rgba(91, 127, 255, 0.3);
    border-radius: 10px;
    text-align: center;
    background-color: rgba(91, 127, 255, 0.05);
    cursor: pointer;
    transition: all 0.25s ease;
    font-weight: 600;
    color: var(--color-secondary);
}

.file-label:hover {
    background-color: rgba(91, 127, 255, 0.1);
    border-color: rgba(91, 127, 255, 0.5);
}

.file-info {
    background: rgba(74, 222, 128, 0.08);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(74, 222, 128, 0.2);
}

.file-info p {
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
    font-size: 0.9rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* ============================================================================
   TEORÍA PAGE
   ============================================================================ */

.progreso-box {
    background: rgba(31, 31, 31, 0.5);
    padding: 1.3rem 2rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.progreso-bar {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.7rem;
}

.progreso-fill {
    height: 100%;
    background: linear-gradient(90deg, #5b7fff, #6dd5ff);
    transition: width 0.3s ease;
}

.pregunta-area {
    flex: 1;
    background: rgba(31, 31, 31, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    backdrop-filter: blur(10px);
}

.pregunta-box h3 {
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.15rem;
    line-height: 1.6;
    font-weight: 600;
}

.opciones {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.opcion {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--color-text-primary);
}

.opcion:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(91, 127, 255, 0.2);
}

.opcion input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--color-secondary);
}

.opcion .letra {
    display: inline-block;
    width: 25px;
    font-weight: 600;
    color: var(--color-secondary);
}

.opcion .texto {
    flex: 1;
    color: var(--color-text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.navegacion-preguntas {
    background: rgba(31, 31, 31, 0.3);
    padding: 1.3rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
}

.numeros-preguntas {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    justify-content: center;
}

.num-btn {
    width: 32px;
    height: 32px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.25s ease;
    color: var(--color-text-primary);
    font-size: 0.85rem;
}

.num-btn:hover {
    border-color: rgba(91, 127, 255, 0.3);
    background: rgba(91, 127, 255, 0.08);
    color: var(--color-secondary);
}

.num-btn.active {
    background: linear-gradient(135deg, #5b7fff, #7b9cff);
    color: white;
    border-color: rgba(91, 127, 255, 0.5);
}

/* ============================================================================
   ADMIN PAGE
   ============================================================================ */

.admin-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: #0a0a0a;
}

.admin-header {
    background: linear-gradient(135deg, #5b7fff 0%, #7b9cff 100%);
    color: white;
    padding: 1.3rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 12px rgba(91, 127, 255, 0.2);
}

.admin-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.admin-nav {
    background: rgba(31, 31, 31, 0.3);
    padding: 0 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    gap: 2rem;
    backdrop-filter: blur(10px);
}

.nav-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-secondary);
    transition: all 0.25s ease;
    font-size: 0.95rem;
}

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

.nav-btn.active {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
}

.admin-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.seccion {
    display: none;
}

.seccion.active {
    display: block;
    animation: slideIn 0.3s ease-out;
}

.seccion h2 {
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 600;
}

.filtros {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.filtros input,
.filtros select {
    padding: 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-primary);
    transition: all 0.25s ease;
}

.filtros input::placeholder {
    color: var(--color-text-secondary);
}

.filtros input:focus,
.filtros select:focus {
    outline: none;
    border-color: rgba(91, 127, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

table {
    width: 100%;
    background: rgba(31, 31, 31, 0.5);
    border-collapse: collapse;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

th {
    background: rgba(91, 127, 255, 0.1);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--color-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.9rem;
}

td {
    padding: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--color-text-primary);
    font-size: 0.9rem;
}

tr:hover {
    background: rgba(91, 127, 255, 0.05);
}

.agregar-estudiante {
    background: rgba(31, 31, 31, 0.5);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row input,
.form-row select,
.form-row textarea {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-primary);
    transition: all 0.25s ease;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: rgba(91, 127, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.form-row button {
    min-width: 150px;
}

.extender-tiempo-box {
    background: rgba(31, 31, 31, 0.5);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    border: 1px solid rgba(109, 213, 255, 0.15);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.extender-tiempo-box .form-row {
    flex-wrap: wrap;
}

.exportar-opciones {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.exportar-opciones button {
    flex: 1;
    min-width: 200px;
}

.estadisticas-box {
    background: rgba(31, 31, 31, 0.5);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(251, 191, 36, 0.15);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.estadisticas-box h3 {
    margin-bottom: 1rem;
    color: var(--color-warning);
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: linear-gradient(135deg, rgba(91, 127, 255, 0.12), rgba(109, 213, 255, 0.08));
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(91, 127, 255, 0.2);
    box-shadow: 0 4px 12px rgba(91, 127, 255, 0.1);
}

.stat-card p {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-secondary);
}

.stat-card small {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ============================================================================
   ANIMACIONES
   ============================================================================ */

.animation-container {
    margin: 1.5rem 0;
    display: flex;
    justify-content: center;
    background: rgba(91, 127, 255, 0.04);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid rgba(91, 127, 255, 0.12);
}

svg {
    width: 100%;
    max-width: 300px;
    height: auto;
}

@keyframes particle-1 {
    0% { cx: 100; cy: 100; r: 3; }
    100% { cx: 180; cy: 40; r: 5; opacity: 0; }
}

@keyframes particle-2 {
    0% { cx: 100; cy: 100; r: 3; }
    100% { cx: 20; cy: 30; r: 5; opacity: 0; }
}

@keyframes particle-3 {
    0% { cx: 100; cy: 100; r: 3; }
    100% { cx: 180; cy: 160; r: 5; opacity: 0; }
}

@keyframes particle-4 {
    0% { cx: 100; cy: 100; r: 3; }
    100% { cx: 40; cy: 170; r: 5; opacity: 0; }
}

@keyframes heat-flow {
    0% { strokeDashoffset: 100; }
    100% { strokeDashoffset: 0; }
}

@keyframes expand {
    0%, 100% { r: 30; }
    50% { r: 50; }
}

@keyframes valve-flow {
    0% { cx: 20; }
    100% { cx: 280; }
}

@keyframes molecule-compress {
    0% { cx: 50; }
    50% { cx: 80; }
    100% { cx: 120; }
}

.particle {
    fill: #5b7fff;
    filter: drop-shadow(0 0 3px rgba(91, 127, 255, 0.4));
}

.heat-arrow {
    stroke: #6dd5ff;
    stroke-width: 2;
    fill: none;
    stroke-dasharray: 100;
    filter: drop-shadow(0 0 3px rgba(109, 213, 255, 0.3));
}

.gas-molecule {
    fill: #ff6b9d;
    filter: drop-shadow(0 0 3px rgba(255, 107, 157, 0.3));
}

.container-rect {
    stroke: #6dd5ff;
    stroke-width: 2;
    fill: none;
    filter: drop-shadow(0 0 3px rgba(109, 213, 255, 0.2));
}

.label-text {
    font-family: var(--font-main);
    font-size: 11px;
    fill: #6dd5ff;
    text-anchor: middle;
}

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

@media (max-width: 768px) {
    .examen-content {
        flex-direction: column;
    }

    .problema-selector {
        width: 100%;
    }

    .admin-nav {
        flex-wrap: wrap;
        gap: 0;
    }

    .nav-btn {
        flex: 1;
        text-align: center;
        padding: 0.75rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    table {
        font-size: 0.9rem;
    }

    th, td {
        padding: 0.75rem;
    }

    .filtros {
        flex-direction: column;
    }

    .filtros input,
    .filtros select {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 1.5rem;
    }

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

    .examen-header {
        flex-direction: column;
        gap: 1rem;
    }

    .examen-footer {
        flex-direction: column;
        gap: 1rem;
    }

    .examen-footer button {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        flex-direction: column;
    }

    .form-row input,
    .form-row select,
    .form-row textarea {
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}