/* Variables */
:root {
    /* Colors - Medical Premium */
    --clr-navy: #0B192C;
    /* Deep Navy Blue */
    --clr-navy-light: #1A365D;
    --clr-cyan: #00A8CC;
    /* Soft Cyan */
    --clr-cyan-hover: #008CA8;
    --clr-silver: #E2E8F0;
    /* Accent Silver */
    --clr-white: #FFFFFF;
    --clr-bg: #F8FAFC;

    --clr-text-main: #334155;
    --clr-text-light: #64748B;

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Transitions */
    --trans-fast: 0.2s ease;
    --trans-normal: 0.3s ease;

    /* Spacing */
    --space-xs: 0.5rem;
    /* 8px */
    --space-sm: 1rem;
    /* 16px */
    --space-md: 2rem;
    /* 32px */
    --space-lg: 4rem;
    /* 64px */
    --space-xl: 6rem;
    /* 96px */

    /* Borders & Shadow */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-pill: 9999px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);

    /* Z-Index */
    --z-header: 100;
    --z-modal: 200;
}

/* Base Reset & Accessibility */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 100%;
    /* User browser preference */
}

body {
    font-family: var(--font-body);
    color: var(--clr-text-main);
    background-color: var(--clr-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: 1.125rem;
    /* 18px body text for readability */
    overflow-x: hidden;
}

/* Typography styles */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    color: var(--clr-navy);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -1px;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.5px;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--space-sm);
    color: var(--clr-text-main);
}

a {
    text-decoration: none;
    color: var(--clr-cyan);
    transition: color var(--trans-fast);
}

a:hover,
a:focus-visible {
    outline: 2px solid var(--clr-cyan);
    outline-offset: 2px;
}

img,
svg,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

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

.text-navy {
    color: var(--clr-navy);
}

.text-cyan {
    color: var(--clr-cyan);
}

.text-white {
    color: var(--clr-white);
}

.bg-navy {
    background-color: var(--clr-navy);
    color: var(--clr-white);
}

.bg-white {
    background-color: var(--clr-white);
}

.bg-light {
    background-color: var(--clr-bg);
}

section {
    padding: var(--space-xl) 0;
    position: relative;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.125rem;
    border-radius: var(--radius-pill);
    cursor: pointer;
    border: none;
    text-align: center;
    transition: all var(--trans-normal);
}

.btn:focus-visible {
    outline: 3px solid var(--clr-navy);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--clr-cyan);
    color: var(--clr-white);
    box-shadow: 0 8px 15px rgba(0, 168, 204, 0.3);
}

.btn-primary:hover {
    background-color: var(--clr-cyan-hover);
    color: var(--clr-white);
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(0, 168, 204, 0.4);
    outline: none;
}

.btn-sm {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
}

/* Header & Nav */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: var(--z-header);
    transition: all var(--trans-normal);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    padding: 1.25rem 0;
}

.header.scrolled {
    padding: 0.75rem 0;
    box-shadow: var(--shadow-sm);
    background-color: rgba(255, 255, 255, 0.98);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--clr-navy);
    letter-spacing: -0.5px;
    outline: none !important;
}

.logo-bold {
    color: var(--clr-cyan);
}

.nav-list {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.nav-link {
    color: var(--clr-text-main);
    font-weight: 600;
    font-size: 1.05rem;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover {
    color: var(--clr-navy);
    outline: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--clr-cyan);
    transition: width var(--trans-normal);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 10;
}

.menu-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--clr-navy);
    border-radius: 3px;
    transition: all var(--trans-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

@media (max-width: 900px) {
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--clr-white);
        box-shadow: var(--shadow-md);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
    }

    .nav.active {
        max-height: 400px;
        padding: var(--space-sm) 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }

    .nav-link {
        display: block;
        padding: 1rem 0;
        width: 100%;
        text-align: center;
    }

    .header-cta {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }
}

/* --- Global Section Helpers --- */
.section-badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    background-color: rgba(11, 25, 44, 0.05);
    color: var(--clr-navy);
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.section-title {
    margin-bottom: var(--space-md);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--clr-cyan);
    border-radius: 3px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--clr-text-light);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
}

.mt-4 {
    margin-top: var(--space-md);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    background: linear-gradient(to right, rgba(11, 25, 44, 0.95) 0%, rgba(11, 25, 44, 0.7) 100%),
        url('https://images.unsplash.com/photo-1544367567-0f2fcb009e0b?auto=format&fit=crop&q=80&w=2000') center/cover no-repeat;
    z-index: -2;
    transform: translateY(0);
    will-change: transform;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    z-index: -1;
    opacity: 0.5;
}

.hero-content {
    max-width: 800px;
    color: var(--clr-white);
    position: relative;
    z-index: 10;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: rgba(0, 168, 204, 0.15);
    border: 1px solid rgba(0, 168, 204, 0.3);
    color: var(--clr-cyan);
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
    backdrop-filter: blur(4px);
}

.hero-title {
    color: var(--clr-white);
    margin-bottom: var(--space-md);
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--clr-silver);
    margin-bottom: var(--space-lg);
    max-width: 650px;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.8);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-link {
    color: var(--clr-white);
    font-weight: 600;
    font-size: 1.125rem;
    outline: none;
    border-radius: 4px;
}

.hero-link:hover,
.hero-link:focus-visible {
    color: var(--clr-cyan);
}

@media (max-width: 768px) {
    .hero {
        min-height: 85vh;
        padding-top: 100px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-actions .btn-large {
        width: 100%;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
}

/* --- Science Section --- */
.science {
    background-color: var(--clr-white);
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.science-card {
    background: var(--clr-bg);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform var(--trans-normal), box-shadow var(--trans-normal);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.science-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--clr-silver);
}

.science-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    background-color: var(--clr-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--clr-cyan);
    box-shadow: var(--shadow-sm);
    transition: all var(--trans-normal);
}

.science-card:hover .science-icon {
    background-color: var(--clr-cyan);
    color: var(--clr-white);
    transform: scale(1.1);
}

.science-icon svg {
    width: 40px;
    height: 40px;
}

.science-card-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.science-card-text {
    color: var(--clr-text-light);
    font-size: 1rem;
    margin-bottom: 0;
}

/* --- Specialized Solutions (Tabs) --- */
.solutions {
    background-color: var(--clr-bg);
}

.tabs-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--clr-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.tabs-header {
    display: flex;
    background-color: var(--clr-navy);
}

.tab-btn {
    flex: 1;
    padding: 1.25rem 1rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.7);
    background: none;
    border: none;
    border-bottom: 4px solid transparent;
    cursor: pointer;
    transition: all var(--trans-normal);
}

.tab-btn:hover {
    color: var(--clr-white);
    background-color: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    color: var(--clr-cyan);
    border-bottom-color: var(--clr-cyan);
    background-color: rgba(255, 255, 255, 0.1);
}

.tab-content {
    display: none;
    padding: var(--space-lg);
    animation: fadeIn 0.4s ease forwards;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    align-items: center;
}

.tab-text h3 {
    margin-bottom: var(--space-sm);
}

.tab-text ul {
    margin-top: var(--space-sm);
}

.tab-text li {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--clr-navy);
    position: relative;
    padding-left: 1.5rem;
}

.tab-text li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--clr-cyan);
    font-weight: bold;
}

.tab-image img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

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

    .tab-btn {
        border-bottom: none;
        border-left: 4px solid transparent;
        text-align: left;
        padding: 1rem 1.5rem;
    }

    .tab-btn.active {
        border-bottom-color: transparent;
        border-left-color: var(--clr-cyan);
    }

    .tab-body {
        grid-template-columns: 1fr;
    }

    .tab-content {
        padding: var(--space-md);
    }

    .tab-image {
        order: -1;
        margin-bottom: var(--space-sm);
    }
}

/* --- Video Gallery --- */
.video-gallery {
    background-color: var(--clr-white);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.video-card {
    background: var(--clr-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--trans-normal), box-shadow var(--trans-normal);
}

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

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    background-color: #000;
    cursor: pointer;
}

.video-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    transition: opacity var(--trans-normal);
}

.video-wrapper:hover img {
    opacity: 0.6;
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: var(--clr-cyan);
    color: var(--clr-white);
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: all var(--trans-fast);
}

.video-wrapper:hover .play-btn {
    background-color: var(--clr-cyan-hover);
    transform: translate(-50%, -50%) scale(1.1);
}

.play-btn svg {
    width: 30px;
    height: 30px;
    margin-left: 4px;
    /* Optical center play triangle */
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    z-index: 10;
}

.video-card-title {
    padding: var(--space-sm);
    font-size: 1.125rem;
    text-align: center;
    margin-bottom: 0;
    font-weight: 600;
    color: var(--clr-navy);
}

/* --- Trust Signals Section --- */
.trust {
    background-color: var(--clr-navy);
    color: var(--clr-white);
    padding: var(--space-xl) 0;
}

.trust .section-badge.badge-light {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--clr-silver);
}

.trust .section-title.title-light {
    color: var(--clr-white);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.trust-item {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform var(--trans-normal);
}

.trust-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.trust-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    color: var(--clr-cyan);
}

.trust-icon svg {
    width: 100%;
    height: 100%;
}

.trust-item h3 {
    color: var(--clr-white);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.trust-item p {
    color: var(--clr-silver);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* --- Quiz / Lead Gen --- */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--clr-white);
    padding: var(--space-xl) var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border-top: 5px solid var(--clr-cyan);
}

.quiz-step {
    animation: fadeIn 0.4s ease forwards;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.quiz-option {
    padding: 1rem;
    background: var(--clr-bg);
    border: 2px solid var(--clr-silver);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--clr-navy);
    cursor: pointer;
    transition: all var(--trans-fast);
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--clr-cyan);
    background: rgba(0, 168, 204, 0.05);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--clr-silver);
    border-top: 4px solid var(--clr-cyan);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.form-input {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--clr-silver);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--trans-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--clr-cyan);
    box-shadow: 0 0 0 3px rgba(0, 168, 204, 0.2);
}

.mt-sm {
    margin-top: var(--space-sm);
}

.py-xl {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
}

.my-md {
    margin-top: var(--space-md);
    margin-bottom: var(--space-md);
}

.discount-box {
    background: var(--clr-bg);
    border: 2px dashed var(--clr-cyan);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: inline-block;
}

.discount-label {
    display: block;
    font-size: 0.875rem;
    color: var(--clr-text-light);
    margin-bottom: 0.25rem;
}

.discount-code {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--clr-navy);
    letter-spacing: 2px;
}

.bounce-anim {
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}