:root {
    --bg-white: #ffffff;
    --text-primary: #000000;
    --text-secondary: #888888;
    --surface-light: #ffffff;
    --border-color: rgba(0, 0, 0, 0.05); /* very light subtle border if needed */
    --accent-color: #000000;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.04);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-white);
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.5;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

.section-padding {
    padding: 10rem 0; /* Huge whitespace */
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 40px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-white);
    border: none;
}

.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-soft);
}

.btn-secondary {
    background-color: var(--bg-white);
    color: var(--text-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    border-color: rgba(0, 0, 0, 0.3);
    transform: scale(1.02);
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background-color: rgba(255, 255, 255, 0.8); /* White glassmorphism */
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.logo-img {
    height: 180px;      
    width: auto;
    margin: -70px -20px; 
    /* Completely removed invert and mix-blend mode to show original logo natively on white */
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 4rem;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero p {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* About Section & History */
.about-section {
    background-color: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    align-items: center;
}

@media (min-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
        gap: 6rem;
    }
}

.about-content {
    text-align: left;
}

.about-content h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.about-content p {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    max-width: 600px;
}

.stat-number {
    font-size: clamp(3rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
    letter-spacing: -0.05em;
}

.stat-label {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Services */
.services {
    background-color: var(--bg-white); /* Pure white */
}

.section-header {
    text-align: center;
    margin-bottom: 5rem; /* airy */
}

.section-header h2 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1.5rem;
}

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem; /* Airy grid */
}

.card {
    background-color: var(--surface-light);
    padding: 3rem 2rem;
    border-radius: 24px;
    border: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03); /* Extremely soft shadow */
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-soft);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card p {
    font-size: 1rem;
}

/* Transformations */
.transformations {
    background-color: var(--bg-white); /* White background only */
}

.transform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.transform-item {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    border: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    aspect-ratio: 4/5;
    background-color: var(--surface-light);
}

.transform-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.transform-item:hover img {
    transform: scale(1.03); /* minimal hover zoom */
}

.transform-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2.5rem 2rem;
    background: linear-gradient(to top, rgba(255,255,255,0.95), transparent);
    z-index: 2;
    text-align: left;
}

.transform-content h3 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.transform-content p {
    color: var(--text-secondary);
}

/* Plans Section */
.plans-section {
    background-color: var(--bg-white);
}

.plans-toggle {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 3rem;
    background-color: var(--surface-light);
    border: 1px solid rgba(0,0,0,0.05);
    padding: 0.5rem;
    border-radius: 40px;
    width: max-content;
    margin-left: auto;
    margin-right: auto;
}

.toggle-btn {
    padding: 0.75rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.toggle-btn.active {
    background-color: var(--text-primary);
    color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.plans-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    max-width: 1050px;
    margin: 0 auto;
}

.plans-long-term {
    display: none;
}

@media (min-width: 900px) {
    .plans-grid {
        grid-template-columns: repeat(3, 1fr);
        align-items: center; 
        gap: 2rem;
    }
}

.plan-card {
    background-color: var(--surface-light);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 24px;
    padding: 3rem 2rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    text-align: center;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.plan-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-soft);
}

.plan-card h3 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.plan-center {
    background-color: var(--text-primary);
    color: var(--bg-white);
    padding: 4rem 2rem; 
    transform: scale(1.05);
}

.plan-center:hover {
    transform: scale(1.05) translateY(-8px);
}

.plan-center h3 {
    color: var(--bg-white);
}

.plan-perks {
    list-style: none;
    margin-bottom: 2.5rem;
    text-align: left;
}

.plan-perks li {
    font-size: 0.95rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.plan-center .plan-perks li {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.85);
}

.plan-perks li:last-child {
    border-bottom: none;
}

.plan-center .btn-primary {
    background-color: var(--bg-white);
    color: var(--text-primary);
}

/* BMI Calculator */
.bmi-section {
    background-color: var(--bg-white);
}

.bmi-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .bmi-grid {
        grid-template-columns: 1fr 1fr;
        align-items: center;
        gap: 4rem;
    }
}

.bmi-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.bmi-card {
    padding: 3rem;
}

.bmi-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.bmi-input {
    padding: 1rem 1.5rem;
    font-size: 1rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    background-color: var(--bg-white);
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
    font-family: inherit;
}

.bmi-input:focus {
    border-color: rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.05);
}

.bmi-btn {
    margin-top: 0.5rem;
    width: 100%;
}

.bmi-result-hidden {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    margin-top: 0;
    padding-top: 0;
    text-align: center;
}

.bmi-result-visible {
    opacity: 1;
    max-height: 200px;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0,0,0,0.05);
    text-align: center;
}

#bmi-score {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

#bmi-category {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Why Us */
.why-us {
    background-color: var(--bg-white);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 4rem; /* Lots of space */
    text-align: left; /* Minimal left-align list style */
    max-width: 900px;
    margin: 0 auto;
}

.why-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Testimonials */
.testimonials {
    background-color: var(--bg-white);
}

.test-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.test-card {
    background-color: var(--surface-light);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.test-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.test-card p {
    color: var(--text-primary);
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.test-author {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-secondary);
}

/* CTA */
.cta-section {
    background-color: var(--bg-white); /* Keep it white */
    text-align: center;
    border-bottom: none;
}

.cta-section h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 2rem;
}

/* Footer */
footer {
    padding: 4rem 0 3rem;
    background-color: var(--bg-white);
    text-align: center;
    border-top: 1px solid rgba(0,0,0,0.05); /* very subtle separation */
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    justify-content: center;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.copyright {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    visibility: visible;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-card {
    background-color: var(--bg-white);
    padding: 3rem;
    border-radius: 24px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    transform: translateY(0) scale(1);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-hidden .modal-card {
    transform: translateY(20px) scale(0.95);
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: transparent;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
    transition: color 0.2s ease;
}

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

.modal-header {
    text-align: center;
    margin-bottom: 2rem;
}

.modal-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.modal-header p {
    font-size: 1rem;
}

/* Media Queries */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero-btns {
        flex-direction: column;
    }
    .section-padding {
        padding: 6rem 0; /* Scale padding down on mobile */
    }
    .test-card {
        padding: 2.5rem;
    }
}