/* =============================================
   CSS Reset & Variables
   ============================================= */

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

:root {
    /* Colors */
    --primary: #0A1628;
    --accent: #00A8FF;
    --accent-secondary: #00D9FF;
    --text-primary: #F0F0F0;
    --text-highlight: #FFFFFF;
    --bg-card: #0F1F35;
    --bg-section-alt: #060D16;

    /* Typography */
    --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;

    /* Typography Scale */
    --text-xs: 0.875rem;
    --text-sm: 1rem;
    --text-base: 1.125rem;
    --text-lg: 1.5rem;
    --text-xl: 2rem;
    --text-2xl: 2.5rem;
    --text-3xl: 3.5rem;

    /* Line Heights */
    --leading-tight: 1.2;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;

    /* Spacing */
    --section-padding: 80px 20px;
    --container-max-width: 1200px;
    --prose-width: 65ch;

    /* Spacing Scale */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 40px;
    --space-xl: 60px;
    --space-2xl: 80px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Effects */
    --transition: all 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

/* Smooth scroll with offset for fixed headers (if added later) */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-body);
    background-color: var(--primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   Accessibility
   ============================================= */

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 0 0 4px 0;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* =============================================
   Typography
   ============================================= */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-highlight);
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 20px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-secondary) 100%);
    border-radius: 2px;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 20px;
}

p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

a:hover {
    color: var(--accent-secondary);
}

/* Content links (not buttons) */
p a,
li a {
    text-decoration: underline;
    text-decoration-color: rgba(0, 168, 255, 0.3);
    text-underline-offset: 3px;
}

p a:hover,
li a:hover {
    text-decoration-color: var(--accent-secondary);
}

.lead {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--accent-secondary);
    margin-bottom: 30px;
    max-width: var(--prose-width);
    line-height: var(--leading-relaxed);
}

.section p {
    max-width: var(--prose-width);
    line-height: var(--leading-relaxed);
}

.emphasis {
    font-size: 1.2rem;
    font-style: italic;
    color: var(--accent-secondary);
    margin: 30px 0;
}

/* =============================================
   Layout & Container
   ============================================= */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-padding);
    min-height: auto;
}

/* Visual rhythm - alternating section emphasis */
.problem-section {
    padding: 100px 20px;
}

.solution-section {
    padding: 100px 20px;
}

/* =============================================
   Hero Section
   ============================================= */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--bg-section-alt) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 168, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 217, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

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

.hero-logo {
    width: 225px;
    height: auto;
    margin-bottom: 20px;
    filter: drop-shadow(0 4px 12px rgba(0, 168, 255, 0.3));
    animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero-headline {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--text-highlight);
    margin: 20px auto;
    max-width: 800px;
    line-height: var(--leading-tight);
}

.hero-subhead {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--text-primary);
    max-width: 700px;
    margin: 0 auto 60px;
    line-height: var(--leading-normal);
    font-weight: 400;
}

.tagline {
    font-size: 1.3rem;
    color: var(--text-primary);
    max-width: 800px;
    margin: 0 auto 60px;
    line-height: 1.8;
}

/* Notice Banner */
.notice-banner {
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.2) 0%, rgba(0, 217, 255, 0.2) 100%);
    border: 2px solid var(--accent);
    border-radius: 12px;
    padding: 30px;
    max-width: 900px;
    margin: 0 auto;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 168, 255, 0.2);
}

.notice-content {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.notice-icon {
    font-size: 2rem;
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.notice-content p {
    margin: 0;
    font-size: 1.1rem;
    line-height: 1.6;
    text-align: left;
    color: var(--text-highlight);
}

/* =============================================
   Value Proposition Section
   ============================================= */

.value-prop-section {
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.05) 0%, rgba(0, 217, 255, 0.05) 100%);
    padding: 60px 20px;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.value-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent);
    text-align: left;
    transition: var(--transition);
}

.value-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.value-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--accent-secondary);
}

.value-card p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    max-width: none;
}

/* =============================================
   Interim CTA Section
   ============================================= */

.interim-cta {
    background: var(--bg-section-alt);
    padding: 60px 20px;
}

.cta-card {
    max-width: 800px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, rgba(0, 217, 255, 0.1) 100%);
    border: 2px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    text-align: center;
}

.cta-card h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 20px;
    color: var(--text-highlight);
}

.cta-card p {
    font-size: var(--text-base);
    color: var(--text-primary);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* =============================================
   Button Styles
   ============================================= */

.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
    border: none;
    border-radius: 6px;
    color: var(--text-highlight);
    font-weight: 600;
    font-size: var(--text-sm);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 168, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    display: inline-block;
    padding: 14px 32px;
    background: transparent;
    border: 2px solid var(--accent);
    border-radius: 6px;
    color: var(--accent);
    font-weight: 600;
    font-size: var(--text-sm);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(0, 168, 255, 0.1);
    border-color: var(--accent-secondary);
    color: var(--accent-secondary);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

/* =============================================
   Problem Section
   ============================================= */

.problem-section {
    background-color: var(--bg-section-alt);
}

.wave-warning {
    text-align: center;
    padding: 50px 40px;
    margin: 50px 0;
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.15) 0%, rgba(0, 217, 255, 0.15) 100%);
    border: 2px solid rgba(0, 168, 255, 0.3);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.wave-warning::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-secondary) 100%);
}

.wave-warning h3 {
    color: var(--accent-secondary);
    font-size: 1.8rem;
    font-style: italic;
    margin: 0;
}

/* =============================================
   Solution Section
   ============================================= */

.solution-section {
    background-color: var(--primary);
}

.security-note {
    background-color: var(--bg-card);
    border-left: 4px solid var(--accent-secondary);
    padding: 30px;
    margin: 40px 0;
    border-radius: 8px;
}

.security-note h3 {
    color: var(--accent-secondary);
    margin-bottom: 15px;
}

.security-note p {
    margin: 0;
    line-height: 1.7;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background-color: var(--bg-card);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0, 168, 255, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0, 168, 255, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.feature-card p {
    margin: 0;
    font-size: 1rem;
    color: var(--text-primary);
}

/* =============================================
   Platform Section
   ============================================= */

.delivery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.delivery-item {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 168, 255, 0.1);
    transition: var(--transition);
}

.delivery-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.delivery-item h4 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.delivery-item p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
}

.platform-note {
    background: var(--bg-card);
    border-left: 4px solid var(--accent-secondary);
    padding: 40px;
    margin: 60px 0 0;
    border-radius: var(--radius-md);
}

.platform-note h3 {
    color: var(--accent-secondary);
    margin-bottom: 20px;
}

.platform-note p {
    margin: 0;
    line-height: var(--leading-relaxed);
}

/* =============================================
   Use Cases Section
   ============================================= */

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.use-case-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 168, 255, 0.1);
    transition: var(--transition);
}

.use-case-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.use-case-card h3 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.use-case-card p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
}

/* =============================================
   Audience Section
   ============================================= */

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.audience-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 168, 255, 0.1);
    transition: var(--transition);
}

.audience-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.audience-card h3 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.audience-card p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
}

.target-note {
    margin-top: 50px;
    padding: 30px;
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, rgba(0, 217, 255, 0.1) 100%);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
}

/* =============================================
   Security Section
   ============================================= */

.security-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.principle-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 168, 255, 0.1);
    transition: var(--transition);
}

.principle-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.principle-card h3 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.principle-card p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
}

.security-conclusion {
    margin-top: 40px;
    padding: 30px;
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, rgba(0, 217, 255, 0.1) 100%);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
}

/* =============================================
   Credentials & Trust Section
   ============================================= */

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin: 50px 0;
}

.credential-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 168, 255, 0.1);
    text-align: center;
    transition: var(--transition);
}

.credential-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 168, 255, 0.15);
}

.credential-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.credential-card h3 {
    color: var(--accent);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.credential-card p {
    margin: 0;
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
}

/* Architecture Preview */
.architecture-preview {
    margin-top: 80px;
    text-align: center;
}

.architecture-preview > h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 30px;
    color: var(--text-highlight);
}

.diagram-placeholder {
    background: var(--bg-card);
    border: 2px solid rgba(0, 168, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    margin-top: 30px;
    position: relative;
    overflow: hidden;
}

.diagram-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-secondary) 100%);
}

.diagram-content {
    max-width: 900px;
    margin: 0 auto;
}

.diagram-note {
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 15px;
}

.diagram-subtext {
    color: var(--text-primary);
    font-size: var(--text-base);
    margin-bottom: 40px;
    line-height: var(--leading-normal);
}

.diagram-layers {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 40px;
}

.layer-item {
    background: rgba(0, 168, 255, 0.05);
    border-left: 4px solid var(--accent);
    padding: 25px 30px;
    border-radius: var(--radius-md);
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: var(--transition);
}

.layer-item:hover {
    background: rgba(0, 168, 255, 0.08);
    border-left-color: var(--accent-secondary);
}

.layer-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-secondary);
}

.layer-desc {
    font-size: var(--text-sm);
    color: var(--text-primary);
    line-height: var(--leading-normal);
}

/* Use Case Outcomes */
.outcome {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 168, 255, 0.2);
    font-size: 0.95rem;
    color: var(--accent-secondary);
    line-height: var(--leading-normal);
}

.outcome strong {
    color: var(--text-highlight);
    font-weight: 600;
}

/* =============================================
   Contact Section
   ============================================= */

.contact-section {
    background-color: var(--bg-section-alt);
}

.contact-intro {
    text-align: center;
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: var(--text-primary);
}

.form-trust-signal {
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, rgba(0, 217, 255, 0.1) 100%);
    border: 1px solid rgba(0, 168, 255, 0.3);
    border-radius: var(--radius-md);
    padding: 20px 30px;
    margin: 0 auto 40px;
    max-width: 700px;
    text-align: center;
}

.form-trust-signal p {
    margin: 0;
    font-size: var(--text-sm);
    color: var(--text-highlight);
    line-height: var(--leading-normal);
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-highlight);
    font-weight: 500;
}

.required {
    color: var(--accent);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background-color: var(--bg-card);
    border: 2px solid rgba(0, 168, 255, 0.2);
    border-radius: 8px;
    color: var(--text-highlight);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(240, 240, 240, 0.4);
}

.form-group input:hover:not(:focus),
.form-group textarea:hover:not(:focus) {
    border-color: rgba(0, 168, 255, 0.4);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 168, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.error-message {
    display: block;
    color: #FF4444;
    font-size: 0.9rem;
    margin-top: 5px;
    min-height: 20px;
}

.submit-btn {
    width: 100%;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
    border: none;
    border-radius: 8px;
    color: var(--text-highlight);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 168, 255, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-status {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
}

.form-status.success {
    background-color: rgba(0, 255, 0, 0.1);
    border: 1px solid rgba(0, 255, 0, 0.3);
    color: #00FF88;
}

.form-status.error {
    background-color: rgba(255, 0, 0, 0.1);
    border: 1px solid rgba(255, 0, 0, 0.3);
    color: #FF4444;
}

/* =============================================
   Footer
   ============================================= */

.footer {
    background-color: var(--bg-section-alt);
    padding: 40px 20px;
    text-align: center;
    border-top: 1px solid rgba(0, 168, 255, 0.1);
}

.footer p {
    margin: 0;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* =============================================
   Responsive Design
   ============================================= */

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 20px;
    }

    h2::after {
        width: 40px;
        height: 3px;
    }

    .problem-section,
    .solution-section {
        padding: 80px 20px;
    }

    .hero {
        min-height: 90vh;
    }

    .hero-logo {
        width: 175px;
    }

    .hero-headline {
        font-size: 1.8rem;
    }

    .hero-subhead {
        font-size: 1rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .value-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .cta-card {
        padding: 35px 25px;
    }

    .delivery-grid,
    .use-case-grid,
    .audience-grid,
    .security-principles,
    .credentials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .diagram-placeholder {
        padding: 40px 25px;
    }

    .diagram-layers {
        gap: 15px;
    }

    .layer-item {
        padding: 20px;
    }

    .notice-banner {
        padding: 20px;
    }

    .notice-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .notice-content p {
        text-align: center;
    }

    p {
        font-size: 1rem;
    }

    .lead {
        font-size: 1.1rem;
    }

    .wave-warning h3 {
        font-size: 1.4rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

@media (max-width: 480px) {
    .hero-logo {
        width: 150px;
    }

    .logo {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
        margin-bottom: 40px;
    }

    .notice-banner {
        padding: 15px;
    }

    .notice-icon {
        font-size: 1.5rem;
    }

    .security-note,
    .wave-warning {
        padding: 20px;
    }
}