/* =========================================
   Variables & Reset
   ========================================= */
:root {
    /* Colors */
    --bg-color: #050505;
    --bg-secondary: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-blue: #00f2ff;
    --accent-purple: #bc13fe;
    --accent-gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));

    /* Fonts */
    --font-main: 'Noto Sans JP', sans-serif;
    --font-en: 'Montserrat', sans-serif;

    /* Spacing */
    --section-padding: 120px;
    --container-width: 1200px;

    /* Effects */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-blur: 10px;
    --glow-shadow: 0 0 20px rgba(0, 242, 255, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

/* =========================================
   Layout Utilities
   ========================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

.section-title {
    font-family: var(--font-en);
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 60px;
    letter-spacing: 0.05em;
    background: linear-gradient(to right, #fff, #666);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    /* For animation */
    transform: translateY(30px);
    transition: all 0.8s ease;
}

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

.section-title.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Header
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 30px 0;
    transition: all 0.4s ease;
}

.header.scrolled {
    padding: 15px 0;
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    font-family: var(--font-en);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.logo-dot {
    color: var(--accent-blue);
}

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-family: var(--font-en);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    position: relative;
    opacity: 0.7;
}

.nav-link:hover {
    opacity: 1;
    color: var(--accent-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-gradient);
    transition: width 0.3s ease;
}

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

.contact-btn {
    padding: 10px 25px;
    border: 1px solid var(--accent-blue);
    border-radius: 30px;
    color: var(--accent-blue);
    opacity: 1;
}

.contact-btn:hover {
    background: var(--accent-blue);
    color: #000;
    box-shadow: var(--glow-shadow);
}

.contact-btn::after {
    display: none;
}

/* Hamburger */
.hamburger {
    display: none;
    cursor: pointer;
}

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

#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

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

.hero-title {
    font-family: var(--font-en);
    font-size: 6rem;
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 30px;
}

.text-gradient {
    background: var(--accent-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-sub {
    font-size: 1.5rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.reveal-text {
    display: inline-block;
    opacity: 0;
    transform: translateY(50px);
    animation: revealText 1s cubic-bezier(0.23, 1, 0.32, 1) forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.8s;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0.7;
}

.scroll-indicator span {
    font-family: var(--font-en);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
}

.scroll-indicator .line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, #fff, transparent);
    animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }

    50% {
        transform: scaleY(1);
        transform-origin: top;
    }

    51% {
        transform: scaleY(1);
        transform-origin: bottom;
    }

    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}

/* =========================================
   Vision Section
   ========================================= */
.vision-wrapper {
    display: flex;
    align-items: center;
    gap: 80px;
}

.vision-text {
    flex: 1;
}

.vision-heading {
    font-size: 2.5rem;
    line-height: 1.5;
    margin-bottom: 40px;
    background: linear-gradient(to right, #fff, #aaa);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    -webkit-text-fill-color: transparent;
}

.vision-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.vision-visual {
    flex: 1;
    height: 500px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.visual-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: var(--accent-gradient);
    filter: blur(80px);
    border-radius: 50%;
    animation: pulseGlow 5s infinite alternate;
}

@keyframes pulseGlow {
    0% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }

    100% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.2);
    }
}

/* =========================================
   Mission Section
   ========================================= */
.mission {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.mission-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80') no-repeat center center/cover;
    opacity: 0.2;
    z-index: -1;
    transform: scale(1.1);
    /* For parallax effect via JS */
}

.mission-title {
    font-family: var(--font-en);
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 40px;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.mission-text {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
}

.highlight {
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 1.5rem;
    display: block;
    margin-top: 20px;
}

/* =========================================
   Philosophy Section
   ========================================= */
.philosophy-wrapper {
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    gap: 80px;
}

.philosophy-text {
    flex: 1;
}

.philosophy-text h3 {
    font-size: 2.5rem;
    margin-bottom: 30px;
}

.philosophy-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.philosophy-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.circle-anim {
    width: 300px;
    height: 300px;
    border: 2px solid var(--accent-purple);
    border-radius: 50%;
    position: relative;
    animation: rotateCircle 10s linear infinite;
}

.circle-anim::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 50%;
    width: 20px;
    height: 20px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-blue);
}

@keyframes rotateCircle {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* =========================================
   Services Section
   ========================================= */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.service-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.1);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transform: translateX(-100%);
    transition: 0.5s;
}

.service-card:hover::before {
    transform: translateX(100%);
}

.service-icon {
    font-size: 3rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
}

.service-card h3 {
    font-family: var(--font-en);
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.service-card h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: normal;
}

.service-card p {
    font-size: 0.95rem;
    color: #ccc;
    margin-bottom: 20px;
}

.service-list li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
    padding-left: 15px;
    position: relative;
}

.service-list li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--accent-purple);
}

.service-btn {
    display: inline-block;
    margin-top: 25px;
    padding: 10px 25px;
    border: 1px solid var(--accent-blue);
    border-radius: 30px;
    color: var(--accent-blue);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.service-btn:hover {
    background: var(--accent-blue);
    color: #000;
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.4);
    transform: translateY(-2px);
}

/* =========================================
   CTA Section
   ========================================= */
.cta-box {
    background: linear-gradient(135deg, #1a1a1a, #0a0a0a);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    padding: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta-box p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 40px;
    background: var(--accent-gradient);
    color: #fff;
    border-radius: 50px;
    font-family: var(--font-en);
    font-weight: 700;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: var(--glow-shadow);
}

/* =========================================
   Company History
   ========================================= */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 30px;
    border-left: 2px solid var(--glass-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
    padding-left: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -36px;
    top: 5px;
    width: 10px;
    height: 10px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-blue);
}

.timeline-year {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    margin-bottom: 5px;
}

.timeline-content {
    font-size: 1.1rem;
}

/* =========================================
   Contact Section
   ========================================= */
.contact-wrapper {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-lead {
    margin-bottom: 40px;
    color: var(--text-secondary);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: #fff;
    font-family: var(--font-main);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.05);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    font-family: var(--font-en);
    font-weight: 700;
    letter-spacing: 0.1em;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    background: var(--accent-blue);
    color: #000;
    box-shadow: var(--glow-shadow);
}

/* =========================================
   Footer
   ========================================= */
.footer {
    padding: 50px 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-secondary);
}

.footer-logo {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-links a:hover {
    color: var(--accent-blue);
}

.copyright {
    font-size: 0.8rem;
    opacity: 0.5;
}

/* =========================================
   Scroll Animation Classes
   ========================================= */
[data-scroll] {
    opacity: 0;
    transform: translateY(50px);
    transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-scroll].in-view {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
    .section-title {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .nav-list {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(5, 5, 5, 0.95);
        backdrop-filter: blur(10px);
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease;
        z-index: 99;
    }

    .nav-list.active {
        right: 0;
    }

    .nav-link {
        font-size: 1.5rem;
    }

    .hamburger {
        display: block;
        z-index: 100;
    }

    .hamburger span {
        display: block;
        width: 25px;
        height: 3px;
        margin: 5px auto;
        background-color: #fff;
        transition: all 0.3s ease;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .company-table-wrapper {
        padding: 20px;
        overflow-x: auto;
    }

    .company-table th,
    .company-table td {
        display: block;
        width: 100%;
    }

    .company-table th {
        border-bottom: none;
        padding-bottom: 5px;
        color: var(--accent-blue);
    }

    .company-table td {
        padding-top: 0;
        padding-bottom: 20px;
        border-bottom: 1px solid var(--glass-border);
    }

    .vision-wrapper,
    .philosophy-wrapper {
        flex-direction: column;
        gap: 40px;
    }

    .philosophy-wrapper {
        flex-direction: column;
    }

    .vision-visual,
    .philosophy-visual {
        width: 100%;
        height: 300px;
    }

    .mission-title {
        font-size: 3rem;
    }

    .container {
        padding: 0 15px;
    }

    .cta-box {
        padding: 40px 20px;
    }

    .form-control {
        padding: 10px;
    }

    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

/* =========================================
   Subpage Header
   ========================================= */
.page-header {
    padding-top: 150px;
    padding-bottom: 10px;
    text-align: center;
}

.page-header .section-title {
    margin-bottom: 15px;
}

.page-header .hero-sub {
    text-align: center;
    margin-bottom: 0;
}

/* Reduce spacing after page-header */
.page-header+.section-padding {
    padding-top: 60px;
}

/* =========================================
   Embedded Form Styles
   ========================================= */
/* Form Container */
.cta-box form {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

/* Labels */
.cta-box label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.font-weight-bold {
    font-weight: 700;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.25em 0.4em;
    font-size: 75%;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
    margin-left: 5px;
}

.badge-danger {
    color: #fff;
    background-color: #dc3545;
    /* Fallback */
    background: var(--accent-purple);
}

/* Inputs */
.form-control {
    display: block;
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    line-height: 1.5;
    color: #fff;
    background-color: rgba(255, 255, 255, 0.05);
    background-clip: padding-box;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    font-family: var(--font-main);
}

.form-control:focus {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-blue);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 242, 255, 0.25);
}

/* Textarea */
textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* Checkbox */
.custom-control {
    position: relative;
    display: block;
    min-height: 1.5rem;
    padding-left: 1.5rem;
    margin-bottom: 20px;
}

.custom-control-input {
    position: absolute;
    left: 0;
    z-index: -1;
    width: 1rem;
    height: 1.25rem;
    opacity: 0;
}

.custom-control-label {
    position: relative;
    margin-bottom: 0;
    vertical-align: top;
    cursor: pointer;
    color: var(--text-secondary);
}

.custom-control-label::before {
    position: absolute;
    top: 0.25rem;
    left: -1.5rem;
    display: block;
    width: 1rem;
    height: 1rem;
    content: "";
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 0.25rem;
}

.custom-control-input:checked~.custom-control-label::before {
    color: #fff;
    border-color: var(--accent-blue);
    background-color: var(--accent-blue);
}

/* Button */
.btn {
    display: inline-block;
    font-weight: 400;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    cursor: pointer;
    font-family: var(--font-en);
    letter-spacing: 0.1em;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-lg {
    padding: 15px 40px;
    font-size: 1.25rem;
    border-radius: 50px;
}

.btn-success {
    color: #fff;
    background: var(--accent-gradient);
    border: none;
    font-weight: 700;
}

.btn-success:hover {
    transform: scale(1.02);
    box-shadow: var(--glow-shadow);
}

/* =========================================
   Opt-in Section (Cyber Data Flow)
   ========================================= */
.optin-box {
    background-color: #050505;
    border: 1px solid rgba(0, 242, 255, 0.3);
    border-radius: 30px;
    padding: 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 50px rgba(0, 242, 255, 0.1);
    /* Cyber Grid Background */
    background-image:
        linear-gradient(rgba(0, 242, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 242, 255, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: center center;
    animation: gridMove 20s linear infinite;
}

/* Moving Grid Animation */
@keyframes gridMove {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: 40px 40px;
    }
}

/* Holographic Sheen Overlay */
.optin-box::before {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: radial-gradient(circle at center,
            rgba(188, 19, 254, 0.15) 0%,
            rgba(0, 242, 255, 0.1) 20%,
            transparent 60%);
    animation: sheenMove 8s ease-in-out infinite alternate;
    pointer-events: none;
    z-index: 0;
}

@keyframes sheenMove {
    0% {
        transform: translate(0, 0) rotate(0deg);
    }

    100% {
        transform: translate(20%, 20%) rotate(10deg);
    }
}

/* Content Layer (Ensure text is above background) */
.optin-box>* {
    position: relative;
    z-index: 1;
}

.optin-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
    text-shadow: 0 0 30px rgba(0, 242, 255, 0.3);
}

.optin-text {
    font-size: 1.1rem;
    color: #e0e0e0;
    margin-bottom: 30px;
    line-height: 2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.optin-highlight {
    color: var(--accent-blue);
    font-weight: 700;
    font-size: 1.3rem;
    text-shadow: 0 0 10px rgba(0, 242, 255, 0.5);
}

.btn-optin {
    display: inline-flex;
    align-items: center;
    gap: 15px;
    padding: 20px 60px;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border: 1px solid var(--accent-blue);
    border-radius: 50px;
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px rgba(0, 242, 255, 0.2), inset 0 0 20px rgba(0, 242, 255, 0.1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(5px);
}

.btn-optin:hover {
    background: var(--accent-blue);
    color: #000;
    box-shadow: 0 0 50px rgba(0, 242, 255, 0.8);
    transform: translateY(-3px) scale(1.05);
    border-color: transparent;
}

.btn-optin::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.8), transparent);
    transform: translateX(-100%) rotate(45deg);
    transition: transform 0.6s;
}

.btn-optin:hover::after {
    transform: translateX(100%) rotate(45deg);
}