/* ===================================
   BIOPIA Design System - Enhanced
   Premium Fintech with Animations
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Minimal palette */
    --color-black: #0a0a0a;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;

    /* Subtle accent - Cool blue */
    --color-accent: #3b82f6;
    --color-accent-dim: rgba(59, 130, 246, 0.5);
    --color-accent-glow: rgba(59, 130, 246, 0.2);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Layout */
    --max-width: 1200px;
    --nav-height: 72px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-slower: 800ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--space-4);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul,
ol {
    list-style: none;
}

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

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes scanLine {
    0% {
        top: 10%;
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        top: 90%;
        opacity: 0;
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 0.6;
    }

    50% {
        transform: scale(1.3);
        opacity: 0;
    }
}

@keyframes scrollIndicator {

    0%,
    100% {
        transform: translateY(0);
        opacity: 1;
    }

    50% {
        transform: translateY(8px);
        opacity: 0.5;
    }
}

@keyframes flowLine {
    0% {
        stroke-dashoffset: 100;
    }

    100% {
        stroke-dashoffset: 0;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn var(--transition-slower) ease forwards;
}

.fade-in-up {
    /* Visible by default - animation enhances, not requires */
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--transition-slower) ease, transform var(--transition-slower) ease;
}

/* When JS adds visible class, it's already visible - this is for progressive enhancement */
.fade-in-up.animate {
    opacity: 0;
    transform: translateY(30px);
}

.fade-in-up.animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 {
    transition-delay: 0.15s;
}

.delay-2 {
    transition-delay: 0.3s;
}

.delay-3 {
    transition-delay: 0.45s;
}

/* ===================================
   Layout
   =================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-24) 0;
    position: relative;
}

.section-alt {
    background-color: var(--color-gray-50);
}

.section-dark {
    background-color: var(--color-black);
    color: var(--color-white);
}

.section-dark h2,
.section-dark h3 {
    color: var(--color-white);
}

.section-dark p {
    color: var(--color-gray-400);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header-left {
    text-align: left;
    margin-bottom: var(--space-8);
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.section-label.light {
    color: var(--color-accent);
}

.section-intro {
    max-width: 600px;
    margin: 0 auto;
    color: var(--color-gray-400);
}

.lead {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ===================================
   Navigation
   =================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-100);
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav.scrolled {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav.dark {
    background: rgba(10, 10, 10, 0.95);
    border-bottom-color: var(--color-gray-800);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-icon {
    height: 32px;
    width: auto;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.03em;
}

.nav.dark .logo-text {
    color: var(--color-white);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
}

.nav.dark .nav-links a {
    color: var(--color-gray-400);
}

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

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

.nav-cta {
    padding: var(--space-2) var(--space-5);
    background: var(--color-black);
    color: var(--color-white) !important;
    border-radius: 6px;
}

.nav.dark .nav-cta {
    background: var(--color-white);
    color: var(--color-black) !important;
}

.nav-cta:hover {
    background: var(--color-gray-800);
}

.nav.dark .nav-cta:hover {
    background: var(--color-gray-200);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav.dark .nav-toggle span {
    background: var(--color-white);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-black);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-gray-800);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary-light {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary-light:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

.btn-full {
    width: 100%;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
            rgba(10, 10, 10, 0.4) 0%,
            rgba(10, 10, 10, 0.7) 50%,
            rgba(10, 10, 10, 0.9) 100%);
}

/* Animated Scan Line */
.scan-line {
    position: absolute;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg,
            transparent 0%,
            var(--color-accent) 20%,
            var(--color-accent) 80%,
            transparent 100%);
    box-shadow: 0 0 20px var(--color-accent-dim), 0 0 40px var(--color-accent-glow);
    animation: scanLine 4s ease-in-out infinite;
    opacity: 0.8;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    text-align: center;
    padding: var(--nav-height) var(--space-6) var(--space-16);
}

.hero h1 {
    font-size: clamp(2.5rem, 7vw, 4rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-6);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-300);
    margin-bottom: var(--space-10);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    z-index: 1;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-gray-500);
    border-radius: 12px;
    margin: var(--space-3) auto 0;
    position: relative;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-white);
    border-radius: 2px;
    animation: scrollIndicator 2s ease-in-out infinite;
}

/* ===================================
   Identity Section
   =================================== */
.section-identity {
    padding: var(--space-32) 0;
}

.identity-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.identity-content .section-label {
    margin-bottom: var(--space-4);
}

.identity-content h2 {
    margin-bottom: var(--space-6);
}

.identity-content .lead {
    color: var(--color-black);
    font-weight: 500;
    margin-bottom: var(--space-6);
}

.identity-content p {
    color: var(--color-gray-600);
}

.identity-image {
    position: relative;
}

.identity-image img {
    border-radius: 16px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.12);
}

/* ===================================
   Three-Factor Authentication
   =================================== */
.factors-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.factor {
    text-align: center;
    padding: var(--space-8);
}

.factor-visual {
    margin-bottom: var(--space-6);
}

.factor-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
}

.factor-svg {
    width: 80px;
    height: 80px;
}

/* Pulse animation for blood flow */
.pulse-animation .pulse-ring {
    transform-origin: center;
    animation: pulse 2s ease-in-out infinite;
}

.pulse-animation .pulse-ring.delay {
    animation-delay: 0.5s;
}

/* Wave animation for liveness */
.wave-path {
    stroke-dasharray: 100;
    animation: flowLine 2s ease-in-out infinite;
}

/* Vein path animation */
.vein-path {
    stroke-dasharray: 150;
    stroke-dashoffset: 150;
    animation: flowLine 3s ease-in-out forwards;
}

.factor h3 {
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.factor p {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin: 0;
}

/* ===================================
   Visual Section (Blood Flow)
   =================================== */
.section-visual {
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.visual-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.visual-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.visual-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to right,
            rgba(10, 10, 10, 0.85) 0%,
            rgba(10, 10, 10, 0.6) 50%,
            rgba(10, 10, 10, 0.4) 100%);
}

.section-visual .container {
    position: relative;
    z-index: 1;
}

.visual-content {
    max-width: 500px;
}

.visual-content .section-label {
    color: var(--color-accent);
}

.visual-content h2 {
    color: var(--color-white);
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-6);
}

.visual-content p {
    color: var(--color-gray-300);
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin: 0;
}

/* ===================================
   How It Works - Steps
   =================================== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.step {
    text-align: center;
}

.step-visual {
    position: relative;
    margin-bottom: var(--space-6);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border: 2px solid var(--color-gray-200);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-black);
    background: var(--color-white);
    position: relative;
    z-index: 1;
}

.step-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--color-black);
    border-radius: 50%;
    color: var(--color-white);
}

.step-check svg {
    width: 28px;
    height: 28px;
}

.step-line {
    position: absolute;
    top: 50%;
    left: calc(50% + 40px);
    width: calc(100% - 32px);
    height: 2px;
    background: var(--color-gray-200);
}

.step:last-child .step-line {
    display: none;
}

.step-content h3 {
    margin-bottom: var(--space-3);
}

.step-content p {
    color: var(--color-gray-500);
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ===================================
   People Section
   =================================== */
.section-people {
    padding: var(--space-32) 0;
    background: var(--color-gray-50);
}

.people-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.people-image img {
    border-radius: 16px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.1);
}

.people-content .section-label {
    margin-bottom: var(--space-4);
}

.people-content h2 {
    margin-bottom: var(--space-6);
}

.people-content .lead {
    color: var(--color-black);
    font-weight: 500;
    margin-bottom: var(--space-4);
}

/* ===================================
   Use Cases
   =================================== */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.use-case {
    padding: var(--space-8);
    background: var(--color-white);
    border-radius: 16px;
    border: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--color-gray-200);
}

.use-case-icon {
    color: var(--color-accent);
    margin-bottom: var(--space-5);
}

.use-case h3 {
    margin-bottom: var(--space-3);
    font-size: var(--font-size-lg);
}

.use-case p {
    color: var(--color-gray-500);
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ===================================
   Security
   =================================== */
.security-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-16);
    align-items: start;
}

.security-content .lead {
    margin-bottom: var(--space-8);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.security-item {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
}

.security-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: 12px;
    color: var(--color-black);
}

.security-item strong {
    display: block;
    color: var(--color-black);
    margin-bottom: var(--space-1);
}

.security-item p {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    margin: 0;
    line-height: 1.6;
}

/* ===================================
   CTA Section
   =================================== */
.section-cta {
    background: var(--color-gray-900);
    padding: var(--space-24) 0;
}

.cta-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.cta-content h2 {
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.cta-content p {
    color: var(--color-gray-400);
    font-size: var(--font-size-lg);
    margin: 0;
}

.cta-form {
    background: var(--color-white);
    padding: var(--space-8);
    border-radius: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.form-group {
    margin-bottom: var(--space-4);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    border: 1px solid var(--color-gray-200);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-black);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-black);
    color: var(--color-gray-400);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.footer-logo-icon {
    height: 28px;
    width: auto;
}

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

.footer-brand p {
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--space-16);
}

.footer-column h4 {
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-column a {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--space-2);
}

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

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ===================================
   Waitlist Section
   =================================== */
.section-waitlist {
    padding: var(--space-20) 0;
}

.waitlist-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    background: var(--color-white);
    padding: var(--space-12);
    border-radius: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.waitlist-content h2 {
    margin-bottom: var(--space-4);
}

.waitlist-content p {
    color: var(--color-gray-600);
    margin: 0;
}

.waitlist-form-container {
    position: relative;
}

.waitlist-input-group {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.waitlist-input-group input {
    flex: 1;
    padding: var(--space-3) var(--space-5);
    border: 1px solid var(--color-gray-200);
    border-radius: 8px;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
}

.waitlist-input-group input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.waitlist-success-message {
    text-align: center;
    padding: var(--space-4);
    animation: fadeIn var(--transition-base) ease forwards;
}

.success-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-glow);
    color: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
}

.success-icon svg {
    width: 24px;
    height: 24px;
}

.form-note {
    font-size: var(--font-size-xs);
    color: var(--color-gray-400);
    margin: 0;
}

.hidden {
    display: none !important;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .security-layout {
        grid-template-columns: 1fr;
    }

    .cta-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .section {
        padding: var(--space-16) 0;
    }

    .section-header {
        margin-bottom: var(--space-10);
    }

    /* Navigation */
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        border-bottom: 1px solid var(--color-gray-100);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }

    .nav.dark .nav-links {
        background: var(--color-gray-900);
        border-bottom-color: var(--color-gray-800);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-cta {
        width: 100%;
        text-align: center;
        padding: var(--space-3) var(--space-4);
    }

    /* Grids */
    .identity-grid,
    .people-grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }

    .identity-image {
        order: -1;
    }

    .factors-grid,
    .steps-grid {
        grid-template-columns: 1fr;
    }

    .step-line {
        display: none;
    }

    .use-cases-grid,
    .security-grid {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        gap: var(--space-8);
    }

    .footer-links {
        gap: var(--space-8);
    }

    /* Form */
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
    }

    .factor,
    .step,
    .use-case {
        padding: var(--space-6);
    }
}

/* Smooth scroll offset for fixed nav */
[id] {
    scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}