/* ===== CSS VARIABLES ===== */
:root {
    --header-height: 4rem;

    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --accent-color: #3b82f6;
    
    /* Typography */
    --body-font: 'Inter', sans-serif;
    --h1-font-size: 2.5rem;
    --h2-font-size: 2rem;
    --h3-font-size: 1.5rem;
    --normal-font-size: 1rem;
    --small-font-size: 0.875rem;
    --smaller-font-size: 0.813rem;
    
    /* Font Weight */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Spacing */
    --mb-0-5: 0.5rem;
    --mb-1: 1rem;
    --mb-1-5: 1.5rem;
    --mb-2: 2rem;
    --mb-2-5: 2.5rem;
    --mb-3: 3rem;
    
    /* Z-index */
    --z-tooltip: 10;
    --z-fixed: 100;
    --z-modal: 1000;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ===== RESPONSIVE TYPOGRAPHY ===== */
@media screen and (min-width: 968px) {
    :root {
        --h1-font-size: 3.5rem;
        --h2-font-size: 2.5rem;
        --h3-font-size: 1.75rem;
        --normal-font-size: 1.125rem;
        --small-font-size: 0.938rem;
        --smaller-font-size: 0.875rem;
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--body-font);
    font-size: var(--normal-font-size);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

h1, h2, h3, h4 {
    color: var(--text-color);
    font-weight: var(--font-semibold);
    line-height: 1.2;
}

ul {
    list-style: none;
}

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

img {
    max-width: 100%;
    height: auto;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: var(--body-font);
}

/* ===== REUSABLE CSS CLASSES ===== */
.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.section {
    padding: 5rem 0 3rem;
}

.section__title {
    font-size: var(--h2-font-size);
    margin-bottom: var(--mb-1);
    text-align: center;
}

.section__description {
    text-align: center;
    color: var(--text-light);
    margin-bottom: var(--mb-2);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section__header {
    margin-bottom: var(--mb-3);
    text-align: center;
}

.section__cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: var(--mb-3);
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-weight: var(--font-medium);
    transition: var(--transition);
    font-size: var(--normal-font-size);
    white-space: nowrap;
}

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

.button--primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}

.button--secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.button--secondary:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-2px);
}

/* ===== HEADER & NAV ===== */
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-fixed);
    background-color: var(--bg-color);
    transition: var(--transition);
}

.header.scroll-header {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav {
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    font-weight: var(--font-semibold);
    font-size: 1.25rem;
    color: var(--text-color);
    transition: var(--transition);
}

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

.nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background-color: var(--bg-color);
    padding: 4rem 2rem;
    transition: right 0.4s ease;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
}

.nav__menu.show-menu {
    right: 0;
}

.nav__list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.nav__link {
    color: var(--text-color);
    font-weight: var(--font-medium);
    transition: var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav__link:hover::after,
.nav__link.active-link::after {
    width: 100%;
}

.nav__link:hover,
.nav__link.active-link {
    color: var(--primary-color);
}

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

.nav__social {
    color: var(--text-color);
    transition: var(--transition);
}

.nav__social:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.nav__toggle,
.nav__close {
    cursor: pointer;
    color: var(--text-color);
    transition: var(--transition);
}

.nav__toggle:hover,
.nav__close:hover {
    color: var(--primary-color);
}

.nav__close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
}

/* ===== HOME SECTION ===== */
.home {
    padding-top: calc(var(--header-height) + 3rem);
}

.home__content {
    text-align: center;
    margin-bottom: var(--mb-3);
}

.home__title {
    font-size: var(--h1-font-size);
    margin-bottom: var(--mb-1-5);
    line-height: 1.2;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.home__description {
    color: var(--text-light);
    margin-bottom: var(--mb-2);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.home__buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== CARDS ===== */
.differentiators {
    display: grid;
    gap: 2rem;
    margin-top: var(--mb-3);
    margin-bottom: var(--mb-3);
}

.card {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.card.animate {
    animation: fadeInUp 0.6s ease forwards;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card__icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--bg-color);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--mb-1);
}

.card__title {
    font-size: var(--h3-font-size);
    margin-bottom: var(--mb-0-5);
}

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

/* ===== SIGNATURE MODEL ===== */
.signature-model {
    margin-top: var(--mb-3);
    margin-bottom: var(--mb-3);
}

.signature-model__grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: var(--mb-2);
}

.signature-card {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--bg-color);
    padding: 2rem;
    border-radius: 1rem;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.signature-card.animate {
    animation: fadeInUp 0.6s ease forwards;
}

.signature-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.3);
}

.signature-card__number {
    font-size: 2.5rem;
    font-weight: var(--font-bold);
    margin-bottom: var(--mb-0-5);
}

.signature-card__title {
    font-size: var(--h3-font-size);
    margin-bottom: var(--mb-0-5);
    color: var(--bg-color);
}

.signature-card__text {
    opacity: 0.9;
}

.signature-model__cta {
    text-align: center;
}

/* ===== ICP CARDS ===== */
.icp-cards {
    display: grid;
    gap: 1.5rem;
    margin-top: var(--mb-3);
    margin-bottom: var(--mb-3);
}

.icp-card {
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 1rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    opacity: 0;
    transform: translateY(30px);
}

.icp-card.animate {
    animation: fadeInUp 0.6s ease forwards;
}

.icp-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
    transition: left 0.5s ease;
}

.icp-card:hover::before {
    left: 100%;
}

.icp-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.icp-card__title {
    font-size: var(--h3-font-size);
    margin-bottom: var(--mb-0-5);
}

.icp-card__text {
    color: var(--text-light);
    margin-bottom: var(--mb-1);
}

.icp-card__arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.icp-card:hover .icp-card__arrow {
    transform: translateX(5px);
}

/* ===== VALIDATION & PROOF ===== */
.validation {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    margin: var(--mb-3) 0;
}

.validation__text {
    color: var(--text-light);
    font-size: var(--small-font-size);
    margin-bottom: var(--mb-0-5);
}

.proof__text {
    font-weight: var(--font-medium);
}

/* ===== MINI ABOUT ===== */
.mini-about {
    text-align: center;
    max-width: 700px;
    margin: var(--mb-3) auto;
    padding: 2rem;
    font-size: 1.125rem;
    color: var(--text-light);
}

/* ===== FINAL CTA ===== */
.final-cta {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--bg-color);
    border-radius: 1rem;
    margin-top: var(--mb-3);
}

.final-cta__text {
    font-size: 1.25rem;
    margin-bottom: var(--mb-1-5);
}

.final-cta .button--primary {
    background-color: var(--bg-color);
    color: var(--primary-color);
}

.final-cta .button--primary:hover {
    background-color: var(--bg-secondary);
}

/* ===== SPLIT CONTENT ===== */
.split-content {
    display: grid;
    gap: 2rem;
    margin: var(--mb-3) 0;
}

.split-content__title {
    margin-bottom: var(--mb-1);
}

.pain-list,
.outcome-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pain-list li,
.outcome-list li {
    padding: 1rem 1rem 1rem 3rem;
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
}

.pain-list li.animate,
.outcome-list li.animate {
    animation: fadeInLeft 0.6s ease forwards;
}

.pain-list li::before,
.outcome-list li::before {
    content: '•';
    position: absolute;
    left: 1rem;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: var(--font-bold);
}

/* ===== PROCESS ===== */
.process {
    margin: var(--mb-3) 0;
}

.process__title {
    text-align: center;
    margin-bottom: var(--mb-2);
}

.process__steps {
    display: grid;
    gap: 2rem;
}

.process__step {
    padding: 2rem;
    border-left: 3px solid var(--primary-color);
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    opacity: 0;
    transform: translateX(-30px);
}

.process__step.animate {
    animation: fadeInLeft 0.6s ease forwards;
}

.process__number {
    font-size: 2rem;
    font-weight: var(--font-bold);
    color: var(--primary-color);
    margin-bottom: var(--mb-0-5);
}

.process__step-title {
    margin-bottom: var(--mb-0-5);
}

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

/* ===== ENGAGEMENT MODEL ===== */
.engagement-model {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    margin: var(--mb-2) 0;
    font-size: 1.125rem;
}

/* ===== APPLIED PROOF ===== */
.applied-proof {
    margin: var(--mb-3) 0;
}

.applied-proof__title {
    text-align: center;
    margin-bottom: var(--mb-2);
}

.proof-example {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    margin-bottom: var(--mb-1-5);
}

.proof-example__item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.proof-example__item:last-child {
    border-bottom: none;
}

.case-snippet {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
}

/* ===== PROBLEM STATEMENT ===== */
.problem-statement {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    margin: var(--mb-2) 0;
    font-size: 1.125rem;
}

/* ===== BENEFITS ===== */
.benefits {
    margin: var(--mb-3) 0;
}

.benefits__title {
    text-align: center;
    margin-bottom: var(--mb-2);
}

.benefits__grid {
    display: grid;
    gap: 1.5rem;
}

.benefit-card {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.benefit-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

/* ===== PROGRAM DETAILS ===== */
.program-details {
    display: grid;
    gap: 2rem;
    margin: var(--mb-3) 0;
}

.program-detail {
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 1rem;
}

.program-detail h4 {
    margin-bottom: var(--mb-1);
}

/* ===== ACADEMIC VALIDATION ===== */
.academic-validation {
    margin: var(--mb-3) 0;
}

.academic-validation__title {
    text-align: center;
    margin-bottom: var(--mb-2);
}

.testimonial {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    border-left: 4px solid var(--primary-color);
    font-style: italic;
    color: var(--text-light);
}

/* ===== AUDIT SECTION ===== */
.audit__header {
    text-align: center;
    margin-bottom: var(--mb-3);
}

.audit__label {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--bg-color);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: var(--small-font-size);
    margin-bottom: var(--mb-1);
}

.audit__selection {
    text-align: center;
    margin-bottom: var(--mb-3);
}

.audit__selection h3 {
    margin-bottom: var(--mb-1-5);
}

.audit__buttons {
    display: grid;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto var(--mb-1-5);
}

.audit__button {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    font-weight: var(--font-medium);
    transition: var(--transition);
}

.audit__button:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-color);
    transform: translateY(-2px);
}

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

.audit__form {
    max-width: 700px;
    margin: 0 auto;
}

.audit__questions {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: var(--mb-2);
}

.question {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: 0.75rem;
}

.question__text {
    margin-bottom: var(--mb-1);
    font-weight: var(--font-medium);
}

.question__options {
    display: flex;
    gap: 1rem;
}

.question__option {
    flex: 1;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    transition: var(--transition);
}

.question__option:hover {
    border-color: var(--primary-color);
}

.question__option.selected {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
}

.audit__results {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.audit__results h3 {
    margin-bottom: var(--mb-1);
}

.audit__results p {
    margin-bottom: var(--mb-2);
    color: var(--text-light);
}

.feedback-section {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 1rem;
    margin: var(--mb-3) 0;
    text-align: left;
}

.feedback-section h4 {
    margin-bottom: var(--mb-1);
}

.feedback-note {
    color: var(--text-light);
    font-size: var(--small-font-size);
    margin-bottom: var(--mb-1);
}

.feedback-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: var(--body-font);
    margin-bottom: var(--mb-1);
    resize: vertical;
}

.feedback-consent {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--mb-1);
    cursor: pointer;
}

.feedback-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.results__cta {
    margin-top: var(--mb-2);
}

/* ===== ABOUT SECTION ===== */
.about__content {
    max-width: 800px;
    margin: 0 auto;
}

.about__belief {
    text-align: center;
    margin-bottom: var(--mb-3);
}

.about__journey {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: var(--mb-3);
}

.about__highlights ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: var(--mb-3);
}

.about__highlights li {
    padding: 1rem 1rem 1rem 3rem;
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    position: relative;
}

.about__highlights li::before {
    content: '✓';
    position: absolute;
    left: 1rem;
    color: var(--primary-color);
    font-weight: var(--font-bold);
}

.about__frameworks {
    text-align: center;
    margin-bottom: var(--mb-3);
}

.about__frameworks h3 {
    margin-bottom: var(--mb-1-5);
}

.frameworks-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.framework-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 2rem;
    font-size: var(--small-font-size);
    transition: var(--transition);
}

.framework-tag:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.about__cta {
    text-align: center;
}

/* ===== CONTACT SECTION ===== */
.contact__content {
    max-width: 600px;
    margin: 0 auto;
}

.contact__info {
    text-align: center;
    margin: var(--mb-2) 0;
}

.contact__email {
    display: inline-block;
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: var(--font-medium);
    transition: var(--transition);
}

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

.contact__form {
    margin-top: var(--mb-2);
}

.form-group {
    margin-bottom: var(--mb-1-5);
}

.form-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: var(--body-font);
    font-size: var(--normal-font-size);
    transition: var(--transition);
}

.form-input:focus {
    border-color: var(--primary-color);
    outline: none;
}

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

/* ===== FOOTER ===== */
.footer {
    background-color: var(--bg-secondary);
    padding: 3rem 0 2rem;
    margin-top: 5rem;
}

.footer__content {
    text-align: center;
    margin-bottom: var(--mb-2);
}

.footer__text {
    color: var(--text-light);
    margin-bottom: var(--mb-1);
}

.footer__link {
    display: block;
    color: var(--primary-color);
    margin-bottom: var(--mb-0-5);
    transition: var(--transition);
}

.footer__link:hover {
    text-decoration: underline;
}

.footer__note {
    color: var(--text-light);
    font-size: var(--small-font-size);
    margin-top: var(--mb-1-5);
}

.footer__bottom {
    text-align: center;
    padding-top: var(--mb-2);
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: var(--small-font-size);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== RESPONSIVE DESIGN ===== */
@media screen and (min-width: 568px) {
    .differentiators {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

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

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

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

@media screen and (min-width: 768px) {
    .nav__menu {
        position: static;
        width: auto;
        height: auto;
        padding: 0;
        box-shadow: none;
    }

    .nav__list {
        flex-direction: row;
        gap: 2rem;
    }

    .nav__toggle,
    .nav__close {
        display: none;
    }

    .nav__link::after {
        bottom: -5px;
    }

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

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

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

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

@media screen and (min-width: 968px) {
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }

    .section {
        padding: 7rem 0 5rem;
    }

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