:root {
    color-scheme: dark;
    --bg: #07111f;
    --panel: rgba(10, 22, 39, 0.9);
    --text: #f5f7ff;
    --muted: #94a3b8;
    --accent: #3ddc97;
    --accent-2: #2f80ed;
    --border: rgba(255, 255, 255, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg), #0d1f35 70%, #132942);
    color: var(--text);
}

.page-shell {
    min-height: 100vh;
    padding: 24px 24px 60px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto 48px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
}

.brand-icon {
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
}

.hero {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 32px;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(2.3rem, 4vw, 3.8rem);
    line-height: 1.1;
    margin: 10px 0 16px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.26em;
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 700;
}

.lead {
    font-size: 1.05rem;
    color: var(--muted);
    max-width: 620px;
    line-height: 1.7;
}

.stats {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.stats div {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    padding: 14px 18px;
    border-radius: 16px;
    min-width: 120px;
}

.stats strong {
    display: block;
    font-size: 1.15rem;
}

.stats span {
    color: var(--muted);
    font-size: 0.85rem;
}

.signup-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 28px;
    box-shadow: 0 20px 80px rgba(0,0,0,0.25);
}

.signup-card h2 {
    margin-top: 0;
    margin-bottom: 8px;
}

.card-copy,
.helper-text {
    color: var(--muted);
    line-height: 1.6;
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 18px;
}

label {
    font-weight: 600;
}

input {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 13px 14px;
    background: rgba(255,255,255,0.04);
    color: var(--text);
    font-size: 1rem;
}

input:focus {
    outline: 2px solid rgba(61, 220, 151, 0.35);
    border-color: var(--accent);
}

button {
    margin-top: 8px;
    border: none;
    border-radius: 999px;
    padding: 13px 16px;
    font-weight: 700;
    cursor: pointer;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: white;
    transition: transform 180ms ease, opacity 180ms ease;
}

button:active {
    transform: scale(0.99);
}

button.scanning {
    pointer-events: none;
    opacity: 0.82;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    display: grid;
    place-items: center;
    padding: 24px;
    z-index: 50;
}

.modal-card {
    width: min(420px, 100%);
    background: rgba(10, 22, 39, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    padding: 28px;
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.35);
}

.modal-card h3 {
    margin-top: 0;
    margin-bottom: 10px;
}

.modal-card p {
    color: var(--muted);
    margin: 0 0 18px;
    line-height: 1.7;
}

.modal-card label {
    display: block;
    margin-bottom: 6px;
}

.modal-card input {
    display: block;
    width: 100%;
    margin-bottom: 14px;
}

.modal-card input:last-of-type {
    margin-bottom: 0;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 18px;
}

.modal-card button {
    width: auto;
}

.modal-card button:first-child {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
}

.modal-card button:last-child {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: white;
}

    .scan-loader {
        display: flex;
        justify-content: center;
        gap: 12px;
        margin: 24px 0 0;
    }

    .scan-loader div {
        width: 12px;
        height: 12px;
        border-radius: 50%;
        background: var(--accent);
        box-shadow: 0 0 18px rgba(61, 220, 151, 0.4);
        animation: pulse 0.8s ease infinite;
    }

    .scan-loader div:nth-child(2) {
        animation-delay: 0.12s;
    }

    .scan-loader div:nth-child(3) {
        animation-delay: 0.24s;
    }

    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.scan-lights {
    display: flex;
    gap: 10px;
}

.scan-lights span {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: rgba(61, 220, 151, 0.95);
    box-shadow: 0 0 16px rgba(61, 220, 151, 0.35);
    animation: pulse 1.2s ease-in-out infinite;
}

.scan-lights span:nth-child(2) {
    animation-delay: 0.18s;
}

.scan-lights span:nth-child(3) {
    animation-delay: 0.36s;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(0.9);
        opacity: 0.55;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
}

.scan-status {
    margin: 0;
    font-size: 0.98rem;
    font-weight: 700;
}

.scan-footer {
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0.01em;
}

.hidden {
    display: none;
}

.message {
    padding: 10px 12px;
    border-radius: 12px;
    margin-top: 12px;
    font-size: 0.95rem;
}

.message.success {
    background: rgba(61, 220, 151, 0.16);
    color: #b8f5db;
}

.message.error {
    background: rgba(255, 99, 99, 0.16);
    color: #ffd4d4;
}

.features {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 60px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.features article {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 18px;
}

.features h3 {
    margin-top: 0;
}

.features p {
    color: var(--muted);
    line-height: 1.7;
}

.social-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

.social-intro {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 32px;
}

.social-intro h2 {
    margin: 10px 0;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.social-icon-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px 16px;
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: transform 180ms ease, border-color 180ms ease;
}

.social-icon-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.social-icon {
    font-size: 2.2rem;
}

#socialMessage {
    max-width: 420px;
    margin: 20px auto 0;
    text-align: center;
}

.result-main {
    max-width: 640px;
    margin: 60px auto;
    padding: 0 24px;
}

.result-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px 32px;
    text-align: center;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.25);
}

.result-card h1 {
    margin: 8px 0 28px;
}

.calc-steps {
    display: flex;
    flex-direction: column;
    gap: 14px;
    text-align: left;
    max-width: 380px;
    margin: 0 auto;
}

.calc-step {
    color: var(--muted);
    font-weight: 600;
    opacity: 0.35;
    transition: opacity 200ms ease, color 200ms ease;
}

.calc-step.active {
    opacity: 1;
    color: var(--text);
}

.result-reveal {
    margin-top: 32px;
}

.gauge-wrap {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto;
}

.gauge {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.gauge-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.08);
    stroke-width: 10;
}

.gauge-fill {
    fill: none;
    stroke: url(#gaugeGradient);
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.2s ease;
}

.gauge-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    font-weight: 800;
}

.result-label {
    margin: 18px 0 26px;
    color: var(--muted);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.result-back {
    display: inline-block;
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
    padding: 12px 20px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
}

.result-back:hover {
    background: rgba(255, 255, 255, 0.14);
}

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

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

    .social-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .page-shell {
        padding: 18px 16px 40px;
    }

    .topbar {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .nav-links {
        gap: 12px;
        flex-wrap: wrap;
    }

    .signup-card {
        padding: 22px;
    }
}