/**
 * EHD Propulsion Page Stylesheet
 * 
 * Enterprise-level design with aerospace aesthetic:
 * - Electric field visualizations
 * - Ion particle animations
 * - Glassmorphism cards
 * - Responsive timeline
 */

/* ============================================================================
   CSS CUSTOM PROPERTIES
   ============================================================================ */

.ehd-page {
    --ehd-bg-primary: #0a0a0f;
    --ehd-bg-secondary: #12121a;
    --ehd-bg-card: rgba(18, 18, 26, 0.85);
    --ehd-bg-card-hover: rgba(24, 24, 36, 0.95);

    --ehd-text-primary: #ffffff;
    --ehd-text-secondary: rgba(255, 255, 255, 0.7);
    --ehd-text-muted: rgba(255, 255, 255, 0.5);

    --ehd-accent-electric: #00d4ff;
    --ehd-accent-plasma: #7c3aed;
    --ehd-accent-gold: #f59e0b;
    --ehd-accent-green: #10b981;
    --ehd-accent-amber: #fbbf24;
    --ehd-accent-cyan: #06b6d4;
    --ehd-accent-purple: #a855f7;

    --ehd-border-subtle: rgba(255, 255, 255, 0.08);
    --ehd-border-glow: rgba(0, 212, 255, 0.3);

    --ehd-glass-bg: rgba(255, 255, 255, 0.03);
    --ehd-glass-border: rgba(255, 255, 255, 0.08);

    --ehd-section-padding: clamp(4rem, 8vw, 8rem);
    --ehd-content-max-width: 1200px;

    background: var(--ehd-bg-primary);
    color: var(--ehd-text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================================================================
   ANIMATIONS KEYFRAMES
   ============================================================================ */

@keyframes ehd-slide-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes ehd-fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes ehd-ion-flow {
    0% {
        left: 10%;
        opacity: 0;
        transform: scale(0.5);
    }

    10% {
        opacity: 1;
        transform: scale(1);
    }

    90% {
        opacity: 1;
        transform: scale(1);
    }

    100% {
        left: 85%;
        opacity: 0;
        transform: scale(0.3);
    }
}

@keyframes ehd-field-pulse {

    0%,
    100% {
        opacity: 0.3;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.02);
    }
}

@keyframes ehd-glow-pulse {

    0%,
    100% {
        opacity: 0.4;
        filter: blur(40px);
    }

    50% {
        opacity: 0.7;
        filter: blur(60px);
    }
}

@keyframes ehd-electric-arc {

    0%,
    100% {
        opacity: 0.5;
        transform: scaleX(0.95);
    }

    50% {
        opacity: 1;
        transform: scaleX(1);
    }
}

@keyframes ehd-timeline-pulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4);
    }

    50% {
        box-shadow: 0 0 0 10px rgba(0, 212, 255, 0);
    }
}

@keyframes ehd-particle-glow {

    0%,
    100% {
        box-shadow: 0 0 4px 2px rgba(0, 212, 255, 0.6);
    }

    50% {
        box-shadow: 0 0 8px 4px rgba(0, 212, 255, 0.9);
    }
}

.ehd-animate-slide-up {
    animation: ehd-slide-up 0.6s ease-out forwards;
}

/* ============================================================================
   SECTION VISIBILITY ANIMATIONS
   ============================================================================ */

.ehd-section--visible .ehd-physics-step,
.ehd-section--visible .ehd-limitation-card,
.ehd-section--visible .ehd-advantage-card,
.ehd-section--visible .ehd-market-card,
.ehd-section--visible .ehd-rd-phase {
    opacity: 1;
    transform: translateY(0);
}

.ehd-physics-step,
.ehd-limitation-card,
.ehd-advantage-card,
.ehd-market-card,
.ehd-rd-phase {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    transition-delay: var(--step-delay, var(--card-delay, var(--phase-delay, 0s)));
}

/* ============================================================================
   BREADCRUMBS
   ============================================================================ */

.ehd-page .breadcrumbs {
    padding: 1rem 2rem;
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
}

.ehd-page .breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.875rem;
}

.ehd-page .breadcrumbs li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--ehd-text-muted);
}

.ehd-page .breadcrumbs li::after {
    content: '/';
    color: var(--ehd-text-muted);
    opacity: 0.5;
}

.ehd-page .breadcrumbs li:last-child::after {
    display: none;
}

.ehd-page .breadcrumbs a {
    color: var(--ehd-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.ehd-page .breadcrumbs a:hover {
    color: var(--ehd-accent-electric);
}

.ehd-page .breadcrumbs li[aria-current="page"] {
    color: var(--ehd-text-primary);
}

/* ============================================================================
   SECTION SPACER
   ============================================================================ */

.ehd-section-spacer {
    height: clamp(2rem, 4vw, 4rem);
}

/* ============================================================================
   HIGHLIGHT BADGES
   ============================================================================ */

.ehd-highlight {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 100px;
    margin-bottom: 1rem;
}

.ehd-highlight--blue {
    background: rgba(0, 212, 255, 0.1);
    color: var(--ehd-accent-electric);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.ehd-highlight--green {
    background: rgba(16, 185, 129, 0.1);
    color: var(--ehd-accent-green);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.ehd-highlight--amber {
    background: rgba(251, 191, 36, 0.1);
    color: var(--ehd-accent-amber);
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.ehd-highlight--purple {
    background: rgba(124, 58, 237, 0.1);
    color: var(--ehd-accent-purple);
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.ehd-highlight--cyan {
    background: rgba(6, 182, 212, 0.1);
    color: var(--ehd-accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.ehd-highlight--gold {
    background: rgba(245, 158, 11, 0.1);
    color: var(--ehd-accent-gold);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* ============================================================================
   SECTION TITLES
   ============================================================================ */

.ehd-section-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--ehd-text-primary);
}

.ehd-section-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--ehd-text-secondary);
    max-width: 700px;
    margin-bottom: 2.5rem;
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.ehd-hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: 6rem 2rem 4rem;
    overflow: hidden;
}

.ehd-hero__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.ehd-hero__gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, var(--ehd-bg-primary) 0%, var(--ehd-bg-secondary) 100%);
}

.ehd-hero__content {
    position: relative;
    z-index: 2;
    max-width: 650px;
    width: 100%;
}

.ehd-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--ehd-accent-electric);
    margin-bottom: 1.5rem;
}

.ehd-hero__title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.ehd-hero__tagline {
    font-size: clamp(1.125rem, 2.5vw, 1.75rem);
    font-weight: 500;
    color: var(--ehd-accent-electric);
    margin-bottom: 1.5rem;
}

.ehd-hero__subtitle {
    font-size: clamp(0.9375rem, 1.8vw, 1.25rem);
    color: var(--ehd-text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.ehd-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.ehd-hero__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.ehd-hero__btn--primary {
    background: linear-gradient(135deg, var(--ehd-accent-electric) 0%, #0099cc 100%);
    color: #000;
}

.ehd-hero__btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
}

.ehd-hero__btn--secondary {
    background: var(--ehd-glass-bg);
    border: 1px solid var(--ehd-glass-border);
    color: var(--ehd-text-primary);
}

.ehd-hero__btn--secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--ehd-accent-electric);
}

.ehd-hero__visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 400px;
    height: 300px;
    z-index: 1;
}

/* Tablet & below: hide visual, full-width content */
@media (max-width: 1024px) {
    .ehd-hero__visual {
        display: none;
    }

    .ehd-hero__content {
        max-width: 100%;
    }
}

/* Mobile-specific hero adjustments */
@media (max-width: 768px) {
    .ehd-hero {
        min-height: auto;
        padding: 5rem 1.25rem 3rem;
    }

    .ehd-hero__badge {
        font-size: 0.65rem;
        padding: 0.375rem 0.75rem;
        margin-bottom: 1rem;
    }

    .ehd-hero__title {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
        margin-bottom: 0.375rem;
    }

    .ehd-hero__tagline {
        font-size: clamp(1rem, 4vw, 1.25rem);
        margin-bottom: 1rem;
    }

    .ehd-hero__subtitle {
        font-size: 0.9375rem;
        margin-bottom: 1.5rem;
    }

    .ehd-hero__actions {
        flex-direction: column;
        gap: 0.75rem;
    }

    .ehd-hero__btn {
        width: 100%;
        justify-content: center;
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .ehd-hero {
        padding: 4rem 1rem 2.5rem;
    }

    .ehd-hero__title {
        font-size: 1.65rem;
    }

    .ehd-hero__tagline {
        font-size: 1rem;
    }

    .ehd-hero__subtitle {
        font-size: 0.875rem;
        line-height: 1.6;
    }
}

/* ============================================================================
   IONIC WIND VISUALIZATION
   ============================================================================ */

.ehd-ionic-viz {
    position: relative;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 16px;
    border: 1px solid var(--ehd-border-glow);
    overflow: hidden;
}

.ehd-ionic-viz__field {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg,
            rgba(0, 212, 255, 0.05) 0%,
            rgba(0, 212, 255, 0.15) 50%,
            rgba(0, 212, 255, 0.05) 100%);
    animation: ehd-field-pulse 3s ease-in-out infinite;
}

.ehd-ionic-viz__emitter {
    position: absolute;
    left: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--ehd-accent-electric), var(--ehd-accent-plasma));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
    animation: ehd-glow-pulse 2s ease-in-out infinite;
}

.ehd-ionic-viz__collector {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 120px;
    background: linear-gradient(180deg,
            rgba(255, 255, 255, 0.1),
            rgba(255, 255, 255, 0.3),
            rgba(255, 255, 255, 0.1));
    border-radius: 4px;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.ehd-ionic-viz__particle {
    position: absolute;
    top: calc(50% + var(--offset, 0%));
    left: 10%;
    width: 8px;
    height: 8px;
    background: var(--ehd-accent-electric);
    border-radius: 50%;
    animation: ehd-ion-flow 2s ease-in-out infinite;
    animation-delay: var(--delay, 0s);
    animation-name: ehd-particle-glow, ehd-ion-flow;
}

.ehd-ionic-viz__field-line {
    position: absolute;
    top: var(--line-offset, 50%);
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg,
            rgba(0, 212, 255, 0.8),
            rgba(0, 212, 255, 0.3),
            rgba(0, 212, 255, 0.8));
    opacity: 0.3;
    animation: ehd-electric-arc 1.5s ease-in-out infinite;
    animation-delay: calc(var(--line-offset) * 0.02s);
}

/* ============================================================================
   ELECTRIC FIELD GRID
   ============================================================================ */

.ehd-field-grid {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.ehd-field-grid__lines {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: ehd-fade-in 1s ease-out;
}

.ehd-field-grid__glow {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(80px);
}

.ehd-field-grid__glow--1 {
    top: -100px;
    left: 20%;
    background: rgba(0, 212, 255, 0.15);
    animation: ehd-glow-pulse 4s ease-in-out infinite;
}

.ehd-field-grid__glow--2 {
    bottom: -100px;
    right: 20%;
    background: rgba(124, 58, 237, 0.1);
    animation: ehd-glow-pulse 4s ease-in-out infinite 2s;
}

.ehd-field-grid__pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    border: 2px solid rgba(0, 212, 255, 0.3);
    border-radius: 50%;
    animation: ehd-timeline-pulse 3s ease-in-out infinite;
}

/* ============================================================================
   PHYSICS SECTION
   ============================================================================ */

.ehd-physics-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-physics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 900px) {
    .ehd-physics-grid {
        grid-template-columns: 1fr;
    }
}

.ehd-physics-steps {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ehd-physics-step {
    display: flex;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.ehd-physics-step:hover {
    background: var(--ehd-bg-card-hover);
    border-color: var(--ehd-border-glow);
    transform: translateX(4px);
}

.ehd-physics-step__number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--ehd-accent-electric), var(--ehd-accent-plasma));
    border-radius: 10px;
    font-weight: 700;
    font-size: 1.125rem;
    color: #fff;
}

.ehd-physics-step__title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    color: var(--ehd-text-primary);
}

.ehd-physics-step__desc {
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    line-height: 1.6;
    margin: 0;
}

.ehd-physics-diagram {
    position: relative;
    height: 350px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 16px;
    border: 1px solid var(--ehd-border-glow);
    overflow: hidden;
}

.ehd-physics-diagram .ehd-ionic-viz {
    height: 280px;
}

.ehd-physics-diagram__caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.7);
    font-size: 0.875rem;
    color: var(--ehd-text-secondary);
    margin: 0;
}

.ehd-physics-diagram__caption strong {
    color: var(--ehd-accent-electric);
}

/* ============================================================================
   LIMITATION SECTION
   ============================================================================ */

.ehd-limitation-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-timeline-marker {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--ehd-text-muted);
}

.ehd-timeline-marker__line {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg,
            var(--ehd-text-muted),
            var(--ehd-accent-electric));
    max-width: 150px;
}

.ehd-timeline-marker--highlight {
    color: var(--ehd-accent-electric);
    font-size: 1rem;
}

.ehd-limitation-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.ehd-limitation-card {
    padding: 2rem;
    background: rgba(251, 191, 36, 0.03);
    border: 1px solid rgba(251, 191, 36, 0.15);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.ehd-limitation-card:hover {
    border-color: rgba(251, 191, 36, 0.3);
    transform: translateY(-4px);
}

.ehd-limitation-card__icon {
    color: var(--ehd-accent-amber);
    margin-bottom: 1rem;
    width: 28px;
    height: 28px;
}

.ehd-limitation-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--ehd-text-primary);
}

.ehd-limitation-card__desc {
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ============================================================================
   BREAKTHROUGH SECTION
   ============================================================================ */

.ehd-breakthrough-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .ehd-comparison {
        grid-template-columns: 1fr;
    }
}

.ehd-comparison__traditional,
.ehd-comparison__inverse {
    padding: 2rem;
    border-radius: 12px;
}

.ehd-comparison__traditional {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.ehd-comparison__inverse {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.ehd-comparison__traditional h3,
.ehd-comparison__inverse h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.ehd-comparison__traditional h3 {
    color: #ef4444;
}

.ehd-comparison__inverse h3 {
    color: var(--ehd-accent-green);
}

.ehd-comparison__flow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.ehd-comparison__flow span {
    padding: 0.375rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    color: var(--ehd-text-primary);
}

.ehd-comparison__flow svg {
    color: var(--ehd-text-muted);
}

.ehd-comparison__traditional p,
.ehd-comparison__inverse p {
    font-size: 0.875rem;
    margin: 0;
}

.ehd-comparison__traditional p {
    color: rgba(239, 68, 68, 0.8);
}

.ehd-comparison__inverse p {
    color: rgba(16, 185, 129, 0.9);
}

.ehd-breakthrough-details {
    padding: 2rem;
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
}

.ehd-breakthrough-details h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--ehd-text-primary);
}

.ehd-breakthrough-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.ehd-breakthrough-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
}

.ehd-breakthrough-list li svg {
    color: var(--ehd-accent-green);
    flex-shrink: 0;
    margin-top: 2px;
}

.ehd-breakthrough-result {
    padding: 1rem 1.25rem;
    background: rgba(16, 185, 129, 0.08);
    border-left: 3px solid var(--ehd-accent-green);
    border-radius: 0 8px 8px 0;
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    margin: 0;
}

.ehd-breakthrough-result strong {
    color: var(--ehd-accent-green);
}

/* ============================================================================
   VISION SECTION
   ============================================================================ */

.ehd-vision-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

@media (max-width: 600px) {
    .ehd-advantages-grid {
        grid-template-columns: 1fr;
    }
}

.ehd-advantage-card {
    padding: 2rem;
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.ehd-advantage-card:hover {
    background: var(--ehd-bg-card-hover);
    border-color: var(--ehd-border-glow);
    transform: translateY(-4px);
}

.ehd-advantage-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(124, 58, 237, 0.1));
    border-radius: 12px;
    margin-bottom: 1.25rem;
    color: var(--ehd-accent-electric);
}

.ehd-advantage-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--ehd-text-primary);
}

.ehd-advantage-card__desc {
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    line-height: 1.6;
    margin: 0;
}

.ehd-applications {
    padding: 2rem;
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
}

.ehd-applications__title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--ehd-text-primary);
}

.ehd-applications__title svg {
    color: var(--ehd-accent-purple);
}

.ehd-applications__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.ehd-application-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
}

.ehd-application-item svg {
    color: var(--ehd-accent-electric);
    flex-shrink: 0;
}

/* ============================================================================
   R&D TIMELINE SECTION
   ============================================================================ */

.ehd-rd-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-rd-timeline {
    position: relative;
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 2rem 0;
}

@media (max-width: 900px) {
    .ehd-rd-timeline {
        flex-direction: column;
    }
}

.ehd-rd-phase {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

@media (max-width: 900px) {
    .ehd-rd-phase {
        flex-direction: row;
        text-align: left;
        gap: 1.5rem;
        min-width: auto;
    }
}

.ehd-rd-phase__marker {
    position: relative;
    margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
    .ehd-rd-phase__marker {
        margin-bottom: 0;
    }
}

.ehd-rd-phase__number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--ehd-accent-cyan), var(--ehd-accent-plasma));
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.125rem;
    color: #fff;
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
    animation: ehd-timeline-pulse 3s ease-in-out infinite;
    animation-delay: var(--phase-delay, 0s);
}

.ehd-rd-phase__title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--ehd-text-primary);
}

.ehd-rd-phase__desc {
    font-size: 0.875rem;
    color: var(--ehd-text-secondary);
    line-height: 1.6;
    margin: 0;
    max-width: 200px;
}

@media (max-width: 900px) {
    .ehd-rd-phase__desc {
        max-width: none;
    }
}

.ehd-rd-timeline__line {
    position: absolute;
    top: calc(2rem + 24px);
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg,
            var(--ehd-accent-cyan),
            var(--ehd-accent-plasma),
            var(--ehd-accent-electric));
    z-index: 0;
}

@media (max-width: 900px) {
    .ehd-rd-timeline__line {
        top: 2rem;
        left: calc(24px);
        right: auto;
        width: 2px;
        height: calc(100% - 4rem);
        background: linear-gradient(180deg,
                var(--ehd-accent-cyan),
                var(--ehd-accent-plasma),
                var(--ehd-accent-electric));
    }
}

/* ============================================================================
   MARKET SECTION
   ============================================================================ */

.ehd-market-section__inner {
    max-width: var(--ehd-content-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-market-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .ehd-market-grid {
        grid-template-columns: 1fr;
    }
}

.ehd-market-card {
    padding: 2rem;
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.ehd-market-card:hover {
    background: var(--ehd-bg-card-hover);
    border-color: var(--ehd-border-glow);
    transform: translateY(-4px);
}

.ehd-market-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    border-radius: 12px;
    margin-bottom: 1.25rem;
    color: var(--ehd-accent-gold);
}

.ehd-market-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--ehd-text-primary);
}

.ehd-market-card__desc {
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ============================================================================
   FAQ SECTION
   ============================================================================ */

.ehd-faq-section__inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.ehd-faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2.5rem;
}

.ehd-faq-item {
    background: var(--ehd-bg-card);
    border: 1px solid var(--ehd-glass-border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.ehd-faq-item:hover {
    border-color: var(--ehd-border-glow);
}

.ehd-faq-item--open {
    border-color: var(--ehd-accent-electric);
}

.ehd-faq-item__question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    color: var(--ehd-text-primary);
    cursor: pointer;
    transition: background 0.2s ease;
}

.ehd-faq-item__question:hover {
    background: rgba(255, 255, 255, 0.02);
}

.ehd-faq-item__icon {
    flex-shrink: 0;
    color: var(--ehd-text-muted);
    transition: transform 0.3s ease, color 0.2s ease;
}

.ehd-faq-item__icon.rotated {
    transform: rotate(180deg);
    color: var(--ehd-accent-electric);
}

.ehd-faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.ehd-faq-item--open .ehd-faq-item__answer {
    max-height: 300px;
    padding: 0 1.5rem 1.5rem;
}

.ehd-faq-item__answer p {
    font-size: 0.9375rem;
    color: var(--ehd-text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ============================================================================
   CTA SECTION
   ============================================================================ */

.ehd-cta-section {
    padding: var(--ehd-section-padding) 2rem;
    background: linear-gradient(180deg,
            var(--ehd-bg-secondary) 0%,
            rgba(0, 212, 255, 0.05) 50%,
            var(--ehd-bg-primary) 100%);
}

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

.ehd-cta-section__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--ehd-text-primary);
}

.ehd-cta-section__description {
    font-size: 1.125rem;
    color: var(--ehd-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.ehd-cta-section__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.ehd-cta-section__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.ehd-cta-section__btn--primary {
    background: linear-gradient(135deg, var(--ehd-accent-electric) 0%, #0099cc 100%);
    color: #000;
}

.ehd-cta-section__btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
}

.ehd-cta-section__btn--secondary {
    background: var(--ehd-glass-bg);
    border: 1px solid var(--ehd-glass-border);
    color: var(--ehd-text-primary);
}

.ehd-cta-section__btn--secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--ehd-accent-electric);
}