:root {
    --primary: #e84b3c;
    --primary-dark: #c9362b;
    --primary-light: #fff0ed;

    --secondary: #1c3557;
    --secondary-light: #eef4fa;

    --accent: #f3b33d;

    --white: #ffffff;
    --background: #f8fafc;
    --background-warm: #fffaf6;

    --text: #172033;
    --text-light: #667085;

    --border: #e5e9ef;

    --success: #16845b;
    --success-background: #e8f7f0;

    --shadow-small: 0 8px 30px rgba(23, 32, 51, 0.08);
    --shadow-large: 0 24px 70px rgba(23, 32, 51, 0.14);

    --radius-small: 12px;
    --radius-medium: 20px;
    --radius-large: 32px;

    --container: 1180px;
}


/* =========================
   RESET
========================= */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;

    font-family:
        Inter,
        Arial,
        Helvetica,
        sans-serif;

    background: var(--white);
    color: var(--text);

    line-height: 1.6;
}

body,
button,
input,
select,
textarea {
    font-family: inherit;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font-size: 1rem;
}

button {
    cursor: pointer;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1,
h2,
h3 {
    line-height: 1.15;
}

h1 {
    margin-bottom: 24px;

    font-size: clamp(2.8rem, 6vw, 5.3rem);
    letter-spacing: -0.055em;
}

h2 {
    margin-bottom: 20px;

    font-size: clamp(2rem, 4vw, 3.4rem);
    letter-spacing: -0.04em;
}

h3 {
    margin-bottom: 12px;

    font-size: 1.25rem;
}

p {
    color: var(--text-light);
}


/* =========================
   GLOBAL
========================= */

.container {
    width: min(calc(100% - 40px), var(--container));
    margin-inline: auto;
}

.section {
    padding: 110px 0;
}

.section-heading {
    max-width: 720px;

    margin: 0 auto 56px;

    text-align: center;
}

.section-heading p {
    max-width: 620px;

    margin: 0 auto;

    font-size: 1.08rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;

    margin-bottom: 18px;
    padding: 7px 13px;

    border-radius: 999px;

    background: var(--primary-light);
    color: var(--primary-dark);

    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.eyebrow-light {
    background: rgba(255, 255, 255, 0.12);
    color: var(--white);
}


/* =========================
   BUTTONS
========================= */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-height: 52px;

    padding: 13px 24px;

    border: 1px solid transparent;
    border-radius: 999px;

    font-weight: 700;

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background-color 0.2s ease,
        border-color 0.2s ease;
}

.button:hover {
    transform: translateY(-2px);
}

.button-primary {
    background: var(--primary);
    color: var(--white);

    box-shadow: 0 12px 30px rgba(232, 75, 60, 0.25);
}

.button-primary:hover {
    background: var(--primary-dark);
}

.button-secondary {
    border-color: var(--border);

    background: var(--white);
    color: var(--secondary);
}

.button-secondary:hover {
    border-color: var(--primary);

    box-shadow: var(--shadow-small);
}

.button-full {
    width: 100%;
}


/* =========================
   HEADER
========================= */

.header {
    position: sticky;
    top: 0;
    z-index: 1000;

    border-bottom: 1px solid rgba(229, 233, 239, 0.8);

    background: rgba(255, 255, 255, 0.92);

    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

.nav {
    display: flex;
    min-height: 76px;

    align-items: center;
    justify-content: space-between;
}


/* =========================
   NUEVO LOGO
========================= */

.logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;

    line-height: 0;
}

.logo-image {
    display: block;

    width: auto;
    height: 84px;
    max-width: 230px;

    object-fit: contain;
}

.footer-logo-image {
    height: 84px;
    max-width: 250px;
}


.nav-links {
    display: flex;
    align-items: center;
    gap: 25px;
}

.nav-links > a {
    color: var(--secondary);

    font-size: 0.94rem;
    font-weight: 600;

    transition: color 0.2s ease;
}

.nav-links > a:hover {
    color: var(--primary);
}

.nav-links .nav-button {
    padding: 10px 19px;

    border-radius: 999px;

    background: var(--secondary);
    color: var(--white);
}

.nav-links .nav-button:hover {
    background: var(--primary);
    color: var(--white);
}

.menu-toggle {
    display: none;

    border: 0;

    background: transparent;
    color: var(--secondary);

    font-size: 1.7rem;
}


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

.hero {
    position: relative;

    overflow: hidden;

    padding: 100px 0 120px;

    background:
        radial-gradient(
            circle at 85% 15%,
            rgba(243, 179, 61, 0.2),
            transparent 25%
        ),
        radial-gradient(
            circle at 10% 80%,
            rgba(232, 75, 60, 0.12),
            transparent 30%
        ),
        var(--background-warm);
}

.hero::before {
    position: absolute;
    top: 80px;
    right: -170px;

    width: 430px;
    height: 430px;

    border: 70px solid rgba(232, 75, 60, 0.06);
    border-radius: 50%;

    content: "";
}

.hero-container {
    position: relative;

    display: grid;
    grid-template-columns: 1.05fr 0.95fr;

    align-items: center;
    gap: 90px;
}

.hero-content {
    max-width: 650px;
}

.hero h1 span {
    color: var(--primary);
}

.hero-description {
    max-width: 610px;

    margin-bottom: 32px;

    font-size: 1.16rem;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;

    margin-bottom: 34px;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 15px 24px;

    color: var(--secondary);

    font-size: 0.92rem;
    font-weight: 600;
}

.hero-features div {
    display: flex;
    align-items: center;
    gap: 7px;
}

.hero-features span {
    display: inline-flex;

    width: 21px;
    height: 21px;

    align-items: center;
    justify-content: center;

    border-radius: 50%;

    background: var(--success-background);
    color: var(--success);

    font-size: 0.75rem;
}

.hero-visual {
    position: relative;

    min-height: 520px;
}

.hero-card {
    border: 1px solid rgba(229, 233, 239, 0.8);

    background: rgba(255, 255, 255, 0.96);

    box-shadow: var(--shadow-large);
}

.main-card {
    position: absolute;
    top: 40px;
    right: 25px;

    width: min(100%, 430px);

    padding: 32px;

    border-radius: var(--radius-large);

    transform: rotate(2deg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;

    margin-bottom: 32px;
}

.card-header strong {
    display: block;

    color: var(--secondary);

    font-size: 1.12rem;
}

.card-header p {
    margin: 2px 0 0;

    font-size: 0.88rem;
}

.card-icon {
    display: inline-flex;

    width: 50px;
    height: 50px;

    align-items: center;
    justify-content: center;

    border-radius: 15px;

    background: var(--secondary-light);

    font-size: 1.5rem;
}

.progress-group {
    margin-bottom: 21px;
}

.progress-label {
    display: flex;
    justify-content: space-between;

    margin-bottom: 7px;

    color: var(--secondary);

    font-size: 0.88rem;
    font-weight: 600;
}

.progress-bar {
    overflow: hidden;

    height: 9px;

    border-radius: 999px;

    background: #edf0f4;
}

.progress {
    display: block;

    height: 100%;

    border-radius: inherit;

    background: var(--primary);
}

.progress-80 {
    width: 80%;
}

.progress-65 {
    width: 65%;
}

.progress-75 {
    width: 75%;
}

.exercise-preview {
    margin-top: 32px;
    padding: 22px;

    border-radius: var(--radius-medium);

    background: var(--background);
}

.exercise-preview p {
    margin-bottom: 5px;

    font-size: 0.82rem;
}

.exercise-preview strong {
    display: block;

    margin-bottom: 16px;

    color: var(--secondary);
}

.exercise-preview button,
.exercise-preview .exercise-button {
    display: flex;

    width: 100%;

    align-items: center;
    justify-content: center;

    padding: 11px 15px;

    border: 0;
    border-radius: 999px;

    background: var(--secondary);
    color: var(--white);

    font-weight: 700;

    transition:
        transform 0.2s ease,
        background-color 0.2s ease;
}

.exercise-preview button:hover,
.exercise-preview .exercise-button:hover {
    transform: translateY(-2px);

    background: var(--primary);
}

.floating-card {
    position: absolute;
    z-index: 2;

    display: flex;

    width: 245px;

    align-items: center;
    gap: 12px;

    padding: 16px 18px;

    border: 1px solid var(--border);
    border-radius: 17px;

    background: var(--white);

    box-shadow: var(--shadow-small);
}

.floating-card > span {
    font-size: 1.4rem;
}

.floating-card strong,
.floating-card small {
    display: block;
}

.floating-card strong {
    color: var(--secondary);

    font-size: 0.9rem;
}

.floating-card small {
    margin-top: 2px;

    color: var(--text-light);

    font-size: 0.75rem;
}

.floating-top {
    top: 5px;
    left: -10px;
}

.floating-bottom {
    right: -10px;
    bottom: 20px;
}


/* =========================
   CARDS
========================= */

.cards-grid {
    display: grid;
    gap: 24px;
}

.cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.cards-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.info-card,
.benefit-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-medium);

    background: var(--white);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        border-color 0.25s ease;
}

.info-card:hover,
.benefit-card:hover {
    transform: translateY(-6px);

    border-color: rgba(232, 75, 60, 0.28);

    box-shadow: var(--shadow-small);
}

.info-card {
    padding: 34px;
}

.info-icon {
    display: inline-flex;

    width: 54px;
    height: 54px;

    align-items: center;
    justify-content: center;

    margin-bottom: 24px;

    border-radius: 16px;

    background: var(--primary-light);

    font-size: 1.6rem;
}

.info-card p,
.benefit-card p {
    margin-bottom: 0;
}


/* =========================
   LESSONS
========================= */

.lessons {
    background: var(--background);
}

.lessons-container {
    display: grid;
    grid-template-columns: 1.05fr 0.75fr;

    align-items: center;
    gap: 90px;
}

.lessons-content > p {
    max-width: 600px;

    margin-bottom: 40px;

    font-size: 1.08rem;
}

.lesson-list {
    display: grid;
    gap: 20px;
}

.lesson-item {
    display: grid;
    grid-template-columns: 55px 1fr;
    gap: 18px;
}

.lesson-item > span {
    display: inline-flex;

    width: 52px;
    height: 52px;

    align-items: center;
    justify-content: center;

    border-radius: 16px;

    background: var(--secondary);
    color: var(--white);

    font-weight: 800;
}

.lesson-item p {
    margin-bottom: 0;
}

.subjects-card {
    padding: 42px;

    border-radius: var(--radius-large);

    background: var(--secondary);

    box-shadow: var(--shadow-large);
}

.subjects-card h3 {
    margin-bottom: 27px;

    color: var(--white);

    font-size: 1.7rem;
}

.subjects-card ul {
    display: grid;
    gap: 16px;

    margin: 0 0 32px;
    padding: 0;

    list-style: none;
}

.subjects-card li {
    display: flex;
    align-items: flex-start;
    gap: 11px;

    color: rgba(255, 255, 255, 0.9);
}

.subjects-card li span {
    color: var(--accent);

    font-weight: 800;
}


/* =========================
   BENEFITS
========================= */

.benefits {
    background: var(--white);
}

.benefit-card {
    padding: 30px;

    text-align: center;
}

.benefit-card > span {
    display: inline-flex;

    width: 58px;
    height: 58px;

    align-items: center;
    justify-content: center;

    margin-bottom: 22px;

    border-radius: 18px;

    background: var(--secondary-light);

    font-size: 1.65rem;
}


/* =========================
   EXERCISES
========================= */

.exercises {
    background: var(--primary-light);
}

.exercises-container {
    display: grid;
    grid-template-columns: 1fr 0.9fr;

    align-items: center;
    gap: 90px;
}

.exercise-demo {
    padding: 38px;

    border: 1px solid rgba(232, 75, 60, 0.12);
    border-radius: var(--radius-large);

    background: var(--white);

    box-shadow: var(--shadow-large);
}

.demo-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;

    margin-bottom: 30px;
}

.exercise-number {
    display: inline-block;

    margin-bottom: 8px;

    color: var(--primary);

    font-size: 0.83rem;
    font-weight: 700;
}

.score {
    flex-shrink: 0;

    padding: 7px 12px;

    border-radius: 999px;

    background: var(--secondary-light);
    color: var(--secondary);

    font-size: 0.82rem;
    font-weight: 700;
}

.question {
    margin-bottom: 22px;

    color: var(--secondary);

    font-size: 1.15rem;
    font-weight: 600;
}

.answers {
    display: grid;
    gap: 12px;

    margin-bottom: 22px;
}

.answers button {
    padding: 14px 18px;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: var(--white);
    color: var(--secondary);

    text-align: left;
    font-weight: 600;

    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        transform 0.2s ease;
}

.answers button:hover {
    transform: translateX(3px);

    border-color: var(--primary);
}

.answers .answer-active {
    border-color: var(--primary);

    background: var(--primary-light);
    color: var(--primary-dark);
}

.answer-feedback {
    display: flex;
    gap: 14px;

    padding: 17px;

    border-radius: 14px;

    background: var(--success-background);
}

.answer-feedback > span {
    display: inline-flex;
    flex-shrink: 0;

    width: 27px;
    height: 27px;

    align-items: center;
    justify-content: center;

    border-radius: 50%;

    background: var(--success);
    color: var(--white);
}

.answer-feedback strong {
    color: var(--success);
}

.answer-feedback p {
    margin: 3px 0 0;

    font-size: 0.9rem;
}

.exercises-content > p {
    margin-bottom: 28px;

    font-size: 1.08rem;
}

.check-list {
    display: grid;
    gap: 14px;

    margin: 0;
    padding: 0;

    list-style: none;
}

.check-list li {
    position: relative;

    padding-left: 33px;

    color: var(--secondary);

    font-weight: 600;
}

.check-list li::before {
    position: absolute;
    top: 2px;
    left: 0;

    display: inline-flex;

    width: 22px;
    height: 22px;

    align-items: center;
    justify-content: center;

    border-radius: 50%;

    background: var(--primary);
    color: var(--white);

    content: "✓";

    font-size: 0.72rem;
}


/* =========================
   ABOUT
========================= */

.about {
    background: var(--white);
}

.about-container {
    display: grid;
    grid-template-columns: 0.8fr 1fr;

    align-items: center;
    gap: 90px;
}

.about-image {
    position: relative;

    overflow: hidden;

    min-height: 520px;

    border-radius: var(--radius-large);

    background: var(--background-warm);

    box-shadow: var(--shadow-large);
}

.about-image::before {
    position: absolute;
    z-index: 1;
    right: -70px;
    bottom: -90px;

    width: 250px;
    height: 250px;

    border: 45px solid rgba(232, 75, 60, 0.08);
    border-radius: 50%;

    content: "";

    pointer-events: none;
}

.teacher-image {
    display: block;

    width: 100%;
    height: 520px;

    object-fit: cover;
    object-position: center top;

    transition: transform 0.4s ease;
}

.about-image:hover .teacher-image {
    transform: scale(1.025);
}

.about-content {
    max-width: 670px;
}

.about-content > p {
    margin-bottom: 20px;

    font-size: 1.06rem;
}

.about-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;

    margin-top: 34px;
}

.about-details div {
    padding: 18px;

    border: 1px solid var(--border);
    border-radius: 15px;

    background: var(--background);
}

.about-details strong,
.about-details span {
    display: block;
}

.about-details strong {
    color: var(--secondary);
}

.about-details span {
    margin-top: 4px;

    color: var(--text-light);

    font-size: 0.82rem;
}


/* =========================
   PRICING
========================= */

.pricing {
    background: var(--background);
}

.pricing-card {
    max-width: 520px;

    margin: 0 auto;
    padding: 45px;

    border: 1px solid var(--border);
    border-radius: var(--radius-large);

    background: var(--white);

    box-shadow: var(--shadow-large);
}

.pricing-label {
    display: inline-block;

    margin-bottom: 20px;
    padding: 7px 12px;

    border-radius: 999px;

    background: var(--primary-light);
    color: var(--primary-dark);

    font-size: 0.82rem;
    font-weight: 700;
}

.price {
    display: flex;
    align-items: flex-end;
    gap: 9px;

    margin-bottom: 20px;
}

.price strong {
    color: var(--secondary);

    font-size: 3.8rem;
    line-height: 1;
}

.price span {
    color: var(--text-light);
}

.pricing-card ul {
    display: grid;
    gap: 14px;

    margin: 28px 0 34px;
    padding: 0;

    list-style: none;
}

.pricing-card li {
    position: relative;

    padding-left: 29px;

    color: var(--secondary);
}

.pricing-card li::before {
    position: absolute;
    left: 0;

    color: var(--success);

    content: "✓";

    font-weight: 800;
}


/* =========================
   CONTACT
========================= */

.contact {
    background: var(--secondary);
}

.contact-container {
    display: grid;
    grid-template-columns: 0.9fr 1fr;

    align-items: center;
    gap: 90px;
}

.contact-content h2,
.contact-content p {
    color: var(--white);
}

.contact-content p {
    max-width: 520px;

    color: rgba(255, 255, 255, 0.72);

    font-size: 1.08rem;
}

.contact-details {
    display: grid;
    gap: 17px;

    margin-top: 35px;
}

.contact-details > div {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-details > div > span {
    display: inline-flex;

    width: 48px;
    height: 48px;

    align-items: center;
    justify-content: center;

    border-radius: 15px;

    background: rgba(255, 255, 255, 0.1);

    font-size: 1.3rem;
}

.contact-details p,
.contact-details strong {
    display: block;

    margin: 0;
}

.contact-details strong {
    color: var(--white);
}

.contact-form {
    padding: 38px;

    border-radius: var(--radius-large);

    background: var(--white);

    box-shadow: var(--shadow-large);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;

    margin-bottom: 7px;

    color: var(--secondary);

    font-size: 0.9rem;
    font-weight: 700;
}

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

    padding: 14px 15px;

    border: 1px solid var(--border);
    border-radius: 12px;
    outline: none;

    background: var(--white);
    color: var(--text);

    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);

    box-shadow: 0 0 0 4px rgba(232, 75, 60, 0.1);
}

.form-note {
    display: block;

    margin-top: 13px;

    color: var(--text-light);

    text-align: center;
}


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

.footer {
    padding: 34px 0;

    background: #11243d;
}

.footer-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.footer p {
    margin: 0;

    color: rgba(255, 255, 255, 0.6);

    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 22px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);

    font-size: 0.88rem;
}

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


/* =========================
   TABLET
========================= */

@media (max-width: 1000px) {

    .section {
        padding: 90px 0;
    }

    .nav-links {
        gap: 17px;
    }

    .logo-image {
        height: 50px;
        max-width: 210px;
    }

    .hero-container,
    .lessons-container,
    .exercises-container,
    .about-container,
    .contact-container {
        grid-template-columns: 1fr;
        gap: 65px;
    }

    .hero-content {
        max-width: 760px;
    }

    .hero-visual {
        width: min(100%, 600px);

        margin: 0 auto;
    }

    .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .lessons-content {
        max-width: 720px;
    }

    .subjects-card {
        max-width: 650px;
    }

    .about-image {
        width: min(100%, 600px);

        margin: 0 auto;
    }

    .teacher-image {
        height: 560px;
    }

    .about-content {
        max-width: 760px;
    }

    .contact-content {
        max-width: 650px;
    }
}


/* =========================
   MOBILE NAVIGATION
========================= */

@media (max-width: 780px) {

    .nav {
        position: relative;
    }

    .logo-image {
        height: 46px;
        max-width: 190px;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: calc(100% + 1px);
        right: 0;
        left: 0;

        display: none;

        padding: 25px 20px;

        border-bottom: 1px solid var(--border);

        background: var(--white);

        box-shadow: var(--shadow-small);
    }

    .nav-links.nav-open {
        display: grid;
    }

    .nav-links a {
        padding: 7px 0;
    }

    .nav-links .nav-button {
        margin-top: 5px;
        padding: 12px 18px;

        text-align: center;
    }

    .cards-grid-3 {
        grid-template-columns: 1fr;
    }
}


/* =========================
   MOBILE
========================= */

@media (max-width: 640px) {

    .container {
        width: min(calc(100% - 28px), var(--container));
    }

    .section {
        padding: 72px 0;
    }

    h1 {
        font-size: 2.65rem;
    }

    h2 {
        font-size: 2.05rem;
    }

    .nav {
        min-height: 68px;
    }

    .logo-image {
        height: 42px;
        max-width: 170px;
    }

    .hero {
        padding: 70px 0 90px;
    }

    .hero-buttons {
        display: grid;
    }

    .hero-buttons .button {
        width: 100%;
    }

    .hero-features {
        display: grid;
        gap: 12px;
    }

    .hero-visual {
        min-height: auto;
    }

    .main-card {
        position: relative;
        top: auto;
        right: auto;

        width: 100%;

        padding: 25px;

        transform: none;
    }

    .floating-card {
        display: none;
    }

    .cards-grid-4 {
        grid-template-columns: 1fr;
    }

    .info-card,
    .benefit-card {
        padding: 27px;
    }

    .subjects-card,
    .exercise-demo,
    .pricing-card,
    .contact-form {
        padding: 27px;
    }

    .lesson-item {
        grid-template-columns: 45px 1fr;
    }

    .lesson-item > span {
        width: 44px;
        height: 44px;

        border-radius: 13px;
    }

    .demo-top {
        display: grid;
    }

    .score {
        width: max-content;
    }

    .about-image {
        width: 100%;
        min-height: 400px;
    }

    .teacher-image {
        height: 400px;

        object-position: center top;
    }

    .about-details {
        grid-template-columns: 1fr;
    }

    .price {
        align-items: flex-start;
        flex-direction: column;
    }

    .price strong {
        font-size: 3rem;
    }

    .footer-container {
        flex-direction: column;

        text-align: center;
    }

    .footer-logo-image {
        height: 52px;
        max-width: 210px;
    }
}