/* ==========================================================================
   Base & Variables
   ========================================================================== */
:root {
    /* --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif; */
    --font-serif: 'Zen Old Mincho', serif;
    --font-sans: 'Klee One', sans-serif;
    --color-red: #B70000;
    --color-dark: #1A1A1A;
    --color-gold: #D4AF37;
    --color-light-gray: #F5F5F5;
    --color-white: #FFFFFF;
    --color-text: #333;
    --ease-out-cubic: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* {
    box-sizing: border-box;
}

html {
    overflow-x: clip;
}

body {
    font-family: var(--font-sans);
    color: #000;
    background: var(--color-dark) url('images/hero-bg-long.jpg') no-repeat center 60px / 100% auto;
    margin: 0;
    font-size: 19px;
    font-weight: 600;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: clip;
    width: 100%;
    position: relative;
}

@media (max-width: 768px) {
    body {
        background-image: url('images/hero-bg-long-sp.jpg');
        font-size: 17px;
    }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
}

main {
    padding-top: 40px;
}

.container {
    max-width: 1100px;
    width: 90%;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 900;
    text-align: center;
    margin: 0 0 2rem 0;
    color: var(--color-dark);
    line-height: 1.2;
    letter-spacing: 0.02em;
}

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto 2.5rem;
    color: #000;
}

@media (max-width: 768px) {
    .section-subtitle {
        font-size: 1.1rem;
    }
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    font-family: var(--font-sans);
    font-weight: 700;
    text-decoration: none;
    border-radius: 5px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: none;
    cursor: pointer;
    white-space: nowrap;
}
.button--primary {
    background-color: var(--color-gold);
    color: var(--color-dark);
}
.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
.button:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.button i {
    margin-right: 0.5rem;
    font-size: 1rem;
    flex-shrink: 0;
    display: inline-block;
}
.hero .button {
    margin-top: 1rem;
}
.hero .button i {
    color: var(--color-dark);
    font-size: 1rem;
    margin-right: 0.5rem;
}
.icon-envelope {
    display: inline-block;
    font-size: 1rem;
    color: var(--color-dark);
    margin-right: 0.5rem;
}

/* ==========================================================================
   Animation Reveal
   ========================================================================== */
.reveal {
    opacity: 0;
    transition: opacity 1s var(--ease-out-cubic), transform 1s var(--ease-out-cubic);
}
.reveal.active {
    opacity: 1;
    transform: none !important;
}

.reveal {
    transform: translateY(50px);
}
.reveal.slide-in-left {
    transform: translateX(-50px);
}
.reveal.slide-in-right {
    transform: translateX(50px);
}
.reveal.scale-in {
    transform: scale(0.9);
}
.reveal.fade-in {
    transform: none;
}
.reveal.rotate-in {
    transform: rotateY(-15deg) translateY(30px);
}
.reveal.zoom-in {
    transform: scale(0.8) translateY(30px);
}
.reveal.slide-up {
    transform: translateY(80px);
}
.reveal.bounce-in {
    transform: translateY(100px) scale(0.95);
    transition: opacity 1.2s var(--ease-out-cubic), transform 1.2s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.stagger { transition-delay: calc(0.12s * var(--i)); }

/* ==========================================================================
   Header & Hero
   ========================================================================== */
.header { 
    position: fixed; 
    top: 0; 
    left: 0; 
    right: 0;
    width: 100%; 
    height: 60px;
    z-index: 100; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 0 2%; 
    background: rgba(0,0,0,0.9); 
    backdrop-filter: blur(20px); 
    border-bottom: 1px solid rgba(255,255,255,0.1);
    box-sizing: border-box;
}
.header__logo img { 
    height: 30px; 
    filter: brightness(1.1);
}
.header__nav { 
    display: flex; 
    gap: 2rem;
}
.header__nav a { 
    text-decoration: none; 
    color: rgba(255,255,255,0.9); 
    font-weight: 600; 
    font-size: 0.9rem;
    position: relative; 
    padding: 0.4rem 1.2rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 20px;
    background: rgba(255,255,255,0.1);
    white-space: nowrap;
}
.header__nav a::after { 
    content: ''; 
    position: absolute; 
    bottom: 0; 
    left: 50%; 
    transform: translateX(-50%);
    width: 0; 
    height: 2px; 
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent); 
    transition: width 0.3s ease; 
}
.header__nav a:hover { 
    color: var(--color-gold); 
}
.header__nav a:hover::after { 
    width: 100%; 
}

.hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; color: var(--color-white); overflow: hidden; padding-top: 44px; box-sizing: border-box; }
.hero__corner-logo {
    position: absolute;
    top: 50px;
    right: 100px;
    width: 300px;
    height: auto;
    z-index: 3;
    opacity: 0.95;
}
/* ★ Ken Burns Effect for Hero BG */
.hero__bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: transparent;
}

.hero__overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: transparent; }
.hero__content { position: relative; z-index: 2; max-width: 90%; margin: -1rem auto 0; display: flex; flex-direction: column; align-items: center; justify-content: center; padding-bottom: 1rem; }
.hero__logo { width: 500px; height: auto; margin-bottom: 0; filter: brightness(1.2) drop-shadow(0 20px 60px rgba(0,0,0,0.9)); }
.hero__title { font-family: var(--font-serif); font-size: 3rem; font-weight: 900; margin: 1.5rem 1.5rem 0 0; text-shadow: 0 3px 10px rgba(0,0,0,0.5); }
.hero__brand { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; color: var(--color-gold); margin-bottom: 0; }
.hero__subtitle { font-size: 1.2rem; margin: 1.5rem 0 1.8rem 0; text-shadow: 0 2px 5px rgba(0,0,0,0.5); }
.hero__scroll-down { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); }
.hero__scroll-down::after { content: ''; position: absolute; left: 50%; transform: translateX(-50%); width: 1px; height: 50px; background: linear-gradient(to bottom, rgba(255,255,255,0.8), transparent); animation: scroll-indicator 2s infinite; }
@keyframes scroll-indicator { 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; } }

/* ==========================================================================
   Image Wipe Reveal
   ========================================================================== */
.image-reveal-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
}
.image-reveal-wrapper.circle { border-radius: 50%; }
.image-reveal-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-light-gray);
    z-index: 2;
    transform: translateX(-101%);
    transition: transform 1.2s var(--ease-out-cubic) 0.3s;
}
.image-reveal-wrapper img {
    display: block;
    width: 100%;
    transform: scale(1.2);
    transition: transform 1.2s var(--ease-out-cubic) 0.3s;
}
.active .image-reveal-wrapper::before {
    transform: translateX(101%);
}
.active .image-reveal-wrapper img {
    transform: scale(1);
}

/* Comparison specific image animations */
.comparison-card .image-reveal-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
}
.comparison-card .image-reveal-wrapper img {
    display: block;
    width: 100%;
    opacity: 0;
    transition: opacity 0.8s var(--ease-out-cubic) 0.3s;
}
.comparison-module.active .comparison-card .image-reveal-wrapper img {
    opacity: 1;
}

/* ==========================================================================
   Parallax Background
   ========================================================================== */
.parallax-bg {
    position: relative;
    background-position: center;
    background-size: cover;
    background-attachment: fixed; /* Fallback for simple parallax */
}

/* ==========================================================================
   Problem & Solution Sections
   ========================================================================== */
.problem { padding: 2rem 0; color: var(--color-white); background-color: transparent; position: relative; }
.problem__container { display: grid; grid-template-columns: 350px 1fr; gap: 3rem; align-items: flex-start; max-width: 1200px; margin: 0 auto; padding: 0 2rem; position: relative; }
.problem__sticky-title { 
    position: -webkit-sticky;
    position: sticky;
    top: 70px; 
    z-index: 5; 
    background-color: transparent; 
    padding: 0.5rem 1rem 0.5rem 0; 
    align-self: flex-start;
    height: fit-content;
    box-sizing: border-box;
    max-width: 100%;
}
.problem__sticky-title h2 { 
    font-family: var(--font-serif); 
    font-size: clamp(1.3rem, 1.8vw, 2rem); 
    line-height: 1.5; 
    margin: 0; 
    letter-spacing: 0.01em; 
    word-break: keep-all;
    overflow-wrap: break-word;
}
.problem__sticky-title h2 span { 
    display: inline-block; 
    word-break: keep-all;
}
.problem__title-line1 { display: inline; }
.problem__title-line2 { display: inline; }
.problem__block { position: relative; margin-bottom: 2rem; }
.problem__block:last-child { margin-bottom: 0; }
.problem__float-title { position: absolute; top: -1.5rem; left: -1.5rem; background-color: rgba(30,30,30,0.8); backdrop-filter: blur(5px); color: var(--color-gold); padding: 0.5rem 1.5rem; font-family: var(--font-serif); font-weight: 700; font-size: 1.2rem; border-radius: 5px; z-index: 10; border: 1px solid rgba(255,255,255,0.1); }
.problem__card { background: #2a2a2a; padding: 0.05rem 15px; border-radius: 8px; border-left: 3px solid var(--color-red); }
.problem__card img { height: 180px; object-fit: cover; margin-bottom: 0.8rem; }
.problem__card h3 { margin-top: 0; font-family: var(--font-serif); font-size: 1.5rem; }

.solution { 
    padding: 0; 
    position: relative; 
    color: var(--color-white);
    display: flex;
    min-height: 600px;
    background-color: #000;
    background-image: url('images/pc_sashimi.png');
    background-position: center center;
    background-size: contain;
    background-repeat: no-repeat;
}
.solution::before { 
    content: ''; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: linear-gradient(to right, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.6) 40%, rgba(0,0,0,0.9) 70%, #000000 100%); 
    pointer-events: none;
}
.solution__logo-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}
.solution__content { 
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem;
    text-align: left;
    position: relative;
    z-index: 2;
}
.solution__logo { max-width: 400px; height: auto; filter: brightness(1.2) drop-shadow(0 10px 30px rgba(0,0,0,0.8)); }
.solution__title { font-family: var(--font-serif); font-size: 3rem; color: var(--color-gold); margin: 0; line-height: 1.2; }
.solution__subtitle { font-size: 1.3rem; margin-top: 2rem; line-height: 1.8; }
@media (max-width: 768px) {
    .solution__subtitle { font-size: 1.1rem; }
}

/* ... (Proof, Benefits, Lineup, etc. and all other styles remain the same as the previous final version) ... */
/* NOTE: For brevity, only the NEW or HEAVILY MODIFIED styles are shown above. The rest of the CSS from the previous complete response should be used. */
.proof { padding: 3rem 0; background: var(--color-light-gray); }
.proof__intro { text-align: center; margin-bottom: 2rem; }
.proof__intro .section-title { 
    color: var(--color-dark); 
}
.underline {
    text-decoration: underline;
    text-decoration-color: var(--color-red);
    text-decoration-thickness: 3px;
    text-underline-offset: 4px;
}
.proof__comparison { max-width: 1000px; margin: 0 auto; }
.comparison-module { margin-bottom: 2rem; }
.comparison-module:last-child { margin-bottom: 0; }
.comparison-module__title { font-family: var(--font-serif); font-size: 2rem; text-align: center; padding: 1.2rem; background: linear-gradient(135deg, var(--color-dark), #2a2a2a); color: var(--color-white); border-radius: 8px 8px 0 0; margin: 0 0 2rem 0; letter-spacing: 0.02em; }
.comparison-module__cards { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: stretch; position: relative; }
.comparison-card { background-color: var(--color-white); border-radius: 8px; box-shadow: 0 5px 20px rgba(0,0,0,0.1); overflow: hidden; transform: translateY(30px); opacity: 0; transition: transform 0.8s var(--ease-out-cubic), opacity 0.8s var(--ease-out-cubic); position: relative; display: flex; flex-direction: column; height: 100%; }
.comparison-card.before { border: 3px solid var(--color-red); }
.comparison-card.after { border: 3px solid #28a745; position: relative; }
.comparison-module.active .comparison-card { transform: translateY(0); opacity: 1; }
.comparison-module.active .comparison-card.after { transition-delay: 0.3s; }
.comparison-card .image-reveal-wrapper { margin: 0; }
.comparison-card img { width: 100%; height: 250px; object-fit: cover; }
.card-content { padding: 1.5rem; flex-grow: 1; display: flex; flex-direction: column; }
.comparison-card__tag { position: absolute; top: 0; left: 0; z-index: 10; padding: 0.2rem 0.4rem; border-radius: 4px; font-weight: 600; font-size: 0.9rem; box-shadow: 0 3px 10px rgba(0,0,0,0.2); display: flex; justify-content: center; align-items: center; }
.comparison-card.before .comparison-card__tag { background: var(--color-red); color: white; }
.comparison-card.after .comparison-card__tag { background: #28a745; color: white; }
.comparison-card h4 { font-family: var(--font-serif); font-size: 1.4rem; margin-top: 0; margin-bottom: 0.5rem; color: var(--color-dark); }
@media (max-width: 768px) {
    .comparison-card h4 { font-size: 1.3rem; }
}
.comparison-card p { font-size: 1.1rem; color: #000; margin: 0; line-height: 1.6; }
@media (max-width: 768px) {
    .comparison-card p { font-size: 0.95rem; }
}
.status-icon { position: absolute; top: 1rem; right: 1rem; width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--color-white); box-shadow: 0 3px 10px rgba(0,0,0,0.2); z-index: 2; background-color: #28a745; }
.benefits { padding: 3rem 0; background-color: var(--color-white); }
.benefits__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-top: 3rem; }
.benefit-item { text-align: center; }
.benefit-item i { font-size: 2.5rem; color: var(--color-red); margin-bottom: 1rem; }
.benefit-item h3 { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 700; }
@media (max-width: 768px) {
    .benefit-item h3 { font-size: 1.2rem; }
}
.lineup { padding: 3rem 0; background-color: var(--color-light-gray); }
.lineup__slideshow {
    position: relative;
    max-width: 1000px;
    margin: 2rem auto 0;
    display: flex;
    align-items: center;
    gap: 2rem;
}
.lineup__main-slider {
    position: relative;
    width: 600px;
    height: 400px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 15px 50px rgba(0,0,0,0.3);
    flex-shrink: 0;
}
.lineup__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: scale(1.1);
    transition: all 1s var(--ease-out-cubic);
}
.lineup__slide.active {
    opacity: 1;
    transform: scale(1);
}
.lineup__slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 8s ease-out;
}
.lineup__slide.active img {
    transform: scale(1.05);
}
.lineup__side-images {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.lineup__side-image {
    width: 120px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    opacity: 0.6;
    transform: scale(0.9);
    transition: all 0.5s var(--ease-out-cubic);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.lineup__side-image.next {
    opacity: 0.8;
    transform: scale(1);
}
.lineup__side-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.lineup__indicators {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}
.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}
.indicator.active {
    background: var(--color-gold);
    transform: scale(1.2);
}
.testimonials { padding: 4rem 0; background-color: var(--color-white); }
.testimonials__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; margin-top: 2rem; }
.testimonial-card { background-color: var(--color-light-gray); padding: 2rem; border-radius: 8px; text-align: center; }
.testimonial-card__photo { width: 80px; height: 80px; object-fit: cover; }
.testimonial-card__text { font-size: 1.3rem; font-style: italic; color: #000; margin-bottom: 1.5rem; }
@media (max-width: 768px) {
    .testimonial-card__text { font-size: 1.1rem; }
}
.testimonial-card__cite { font-weight: 700; font-style: normal; }
.cta { color: var(--color-white); text-align: center; }
.cta .container { padding: 4rem 2rem; }
.cta__title { font-family: var(--font-serif); font-size: 3rem; color: var(--color-gold); margin-bottom: 1.5rem; }
.cta__subtitle { font-size: 1.3rem; margin-bottom: 3rem; line-height: 1.6; }
@media (max-width: 768px) {
    .cta__subtitle { font-size: 1.2rem; }
}
.cta__contact { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; text-align: center; }
.cta__email-button { 
    display: inline-flex; 
    align-items: center; 
    gap: 0.8rem; 
    font-size: 1.1rem; 
    padding: 1.2rem 2.5rem;
    text-decoration: none;
    transition: all 0.3s ease;
}
.cta__email-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.4);
}
.cta__email-button i { font-size: 1.2rem; }
.cta__email-text { 
    font-size: 1.2rem; 
    color: rgba(255,255,255,0.8); 
    font-family: var(--font-sans);
    margin: 0;
}
@media (max-width: 768px) {
    .cta__email-text { font-size: 1rem; }
}

.footer { padding: 2rem 0; text-align: center; color: #888; background-color: var(--color-dark); }
@media (max-width: 768px) { 
    .container {
        width: 95%;
        padding: 0 1rem;
    }
    
    .cta__title {
        font-size: 2rem;
        line-height: 1.3;
        margin-bottom: 1rem;
        word-break: keep-all;
        overflow-wrap: break-word;
    }
    
    .cta__subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
        line-height: 1.6;
        word-break: keep-all;
        overflow-wrap: break-word;
    }
    
    .section-title { 
        font-size: 1.8rem; 
        line-height: 1.3;
        margin-bottom: 1rem;
    } 
    
    .section-subtitle {
        font-size: 1rem;
        margin: 0 auto 1.5rem;
        padding: 0 0.5rem;
    }
    
    .header__nav { display: none; }
    
    /* Hero Section Mobile Optimization */
    .hero {
        height: auto;
        min-height: auto;
        padding-top: 80px;
        padding-bottom: 20px;
    }
    
    .hero__corner-logo {
        width: 120px;
        top: 30px;
        right: 10px;
    }
    
    .hero__content {
        padding: 20px 1rem;
        padding-bottom: 20px;
    }
    
    .hero__logo { 
        width: 250px; 
        margin-bottom: 0;
    }
    
    .hero__title { 
        font-size: 2.2rem; 
        line-height: 1.2;
        margin-bottom: 0.6rem;
    } 
    
    .hero__brand {
        font-size: 1.2rem;
        margin-bottom: 0.6rem;
    }
    
    .hero__subtitle { 
        font-size: 1rem; 
        line-height: 1.5;
        margin-top: 0.6rem;
        margin-bottom: 0.6rem;
        padding: 0 1rem;
    }
    
    

    .hero__scroll-down {
        display: none;
    }

    .hero__bg {
        background-size: auto 100%;
        background-position: 0% top;
    }
    
    /* Problem Section Mobile Optimization */
    .problem { 
        padding: 0.7rem 0; 
    }
    
    .problem__container { 
        grid-template-columns: 1fr; 
        padding: 0 1rem;
        gap: 2rem;
        display: flex;
        flex-direction: column;
    } 
    
    .problem__sticky-title { 
        position: static; 
        margin-bottom: 0; 
        text-align: center;
        padding: 0;
        background: transparent;
        order: 1;
        width: 100%;
        max-width: none;
    } 
    
    .problem__sticky-title h2 { 
        font-size: 1.6rem;
        line-height: 1.25;
        word-break: keep-all;
        overflow-wrap: break-word;
    }
    
    .problem__cards {
        order: 2;
    }
    
    .problem__block {
        margin-bottom: 2rem;
    }
    
    .problem__float-title {
        position: static;
        display: inline-block;
        margin-bottom: 1rem;
        font-size: 1rem;
    }
    
    .problem__card {
        padding: 1.5rem;
    }
    
    .problem__card img {
        height: 180px;
        width: 100%;
    }
    
    .problem__card h3 {
        font-size: 1.3rem;
        line-height: 1.3;
    }
    
    .problem__card p {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    /* Solution Section Mobile Optimization */
    .solution { 
        flex-direction: column; 
        min-height: auto;
        background-image: url('images/sashimi.png');
        background-attachment: local;
        background-size: contain;
        background-position: center center;
    }
    
    .solution::before { 
        background: linear-gradient(to bottom, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.7) 100%);
    }
    
    .solution__logo-section {
        padding: 3rem 2rem 2rem;
        order: 1;
    }
    
    .solution__logo {
        max-width: 280px;
    }
    
    .solution__content { 
        padding: 2rem; 
        text-align: center; 
        order: 2;
        background: rgba(0,0,0,0.3);
        backdrop-filter: blur(8px);
    }
    
    .solution__title { 
        font-size: 2rem;
        line-height: 1.2;
        /* margin-bottom: 1.5rem; */
    }
    
    .solution__subtitle {
        font-size: 1rem;
        line-height: 1.7;
    }
    
    /* Proof Section Mobile Optimization */
    .proof {
        padding: 2.5rem 0;
    }
    
    .proof__intro {
        margin-bottom: 2rem;
    }
    
    .comparison-module {
        margin-bottom: 2rem;
    }
    
    .comparison-module__title {
        font-size: 1.4rem;
        padding: 1rem;
    }
    
    .comparison-module__cards { 
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .comparison-card.after { 
        transition-delay: 0s; 
    }
    
    .comparison-card img {
        height: 200px;
    }
    
    .comparison-card h4 {
        font-size: 1.2rem;
    }
    
    .comparison-card p {
        font-size: 0.9rem;
    }
    
    /* Benefits Section Mobile Optimization */
    .benefits {
        padding: 2.5rem 0;
    }
    
    .benefits__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .benefit-item h3 {
        font-size: 1.1rem;
    }
    
    /* Lineup Section Mobile Optimization */
    .lineup {
        padding: 2.5rem 0;
    }
    
    .lineup__slideshow { 
        flex-direction: column; 
        max-width: 95%; 
        gap: 1rem;
    }
    
    .lineup__main-slider { 
        width: 100%; 
        height: 250px; 
        order: 2;
    }
    
    .lineup__side-images { 
        flex-direction: row; 
        justify-content: center; 
        gap: 0.5rem;
        order: 1;
    }
    
    .lineup__side-left { order: 1; }
    .lineup__side-right { order: 3; }
    
    .lineup__side-image { 
        width: 60px; 
        height: 45px; 
    }
    
    /* Testimonials Section Mobile Optimization */
    .testimonials {
        padding: 2.5rem 0;
    }
    
    .testimonials__grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .testimonial-card {
        padding: 1.5rem;
    }
    
    .testimonial-card__text {
        font-size: 1rem;
    }
    
    /* CTA Section Mobile Optimization */
    .cta .container {
        padding: 2.5rem 1rem;
    }
    
    .cta__title {
        font-size: 2rem;
        line-height: 1.3;
        margin-bottom: 1rem;
    }
    
    .cta__subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
        line-height: 1.6;
    }
    
    .cta__email-button { 
        font-size: 1rem; 
        padding: 1rem 2rem;
        width: 90%;
        max-width: 300px;
        margin: 0 auto;
        display: flex;
        justify-content: center;
    }
    
    .cta__email-text { 
        font-size: 0.9rem;
        font-family: var(--font-sans);
    }
    
    /* Button Mobile Optimization */
    .button {
        padding: 0.8rem 2rem;
        font-size: 0.95rem;
    }
}

/* Medium screens */
@media (max-width: 1200px) {
    .problem__container {
        grid-template-columns: 280px 1fr;
    }
    
    .problem__sticky-title h2 {
        font-size: 2rem;
        line-height: 1.15;
    }
    
    .problem__sticky-title {
        padding: 0.5rem 0.5rem 0.5rem 0;
    }
}

/* Tablet Optimization */
@media (max-width: 1024px) and (min-width: 769px) {
    .container {
        width: 92%;
    }
    
    .section-title {
        font-size: 2.8rem;
    }
    
    .hero__title {
        font-size: 3.5rem;
    }
    
    .hero__logo {
        width: 400px;
    }
    
    .problem__container {
        gap: 2rem;
        grid-template-columns: 280px 1fr;
    }
    
    .problem__sticky-title h2 {
        font-size: 1.8rem;
        line-height: 1.15;
    }
    
    .solution__title {
        font-size: 3.5rem;
    }
    
    .comparison-module__cards {
        gap: 1.5rem;
    }
}

/* Small Mobile Optimization */
@media (max-width: 480px) {
    .container {
        width: 98%;
        padding: 0 0.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .hero__logo {
        width: 200px;
        margin-bottom: 0;
    }
    
    .hero__title {
        font-size: 1.8rem;
    }
    
    .hero__brand {
        font-size: 1rem;
    }
    
    .hero__subtitle {
        font-size: 0.9rem;
        padding: 0 0.5rem;
    }
    
    .problem__sticky-title h2 {
        font-size: 1.5rem;
    }
    
    .problem__card {
        padding: 1rem;
    }
    
    .problem__card img {
        height: 150px;
    }
    
    .problem__card h3 {
        font-size: 1.1rem;
    }
    
    .solution__title {
        font-size: 1.6rem;
    }
    
    .solution__subtitle {
        font-size: 0.9rem;
    }
    
    .comparison-module__title {
        font-size: 1.2rem;
    }
    
    .comparison-card img {
        height: 150px;
    }
    
    .lineup__main-slider {
        height: 200px;
    }
    
    .cta__title {
        font-size: 1.6rem;
    }
    
    .cta__subtitle {
        font-size: 0.9rem;
    }
    
    .cta__email-button {
        font-size: 0.9rem;
        padding: 0.8rem 1.5rem;
        width: 95%;
        margin: 0 auto;
        display: flex;
        justify-content: center;
    }
}

/* ==========================================================================
   Language Switcher
   ========================================================================== */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.language-switcher button {
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-sans);
}

.language-switcher button:hover {
    background: rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.9);
    border-color: rgba(255,255,255,0.4);
}

.language-switcher button.active {
    background: var(--color-gold);
    color: var(--color-dark);
    border-color: var(--color-gold);
}

.language-switcher button.active:hover {
    background: var(--color-gold);
    transform: scale(1.05);
}

/* Mobile styles for language switcher */
@media (max-width: 768px) {
    .language-switcher {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.3rem;
        margin: 0 0.5rem;
    }
    
    .language-switcher button {
        font-size: 0.75rem;
        padding: 0.25rem 0.6rem;
    }
}

/* Vietnamese language font override */
html[lang="vi"] body,
html[lang="vi"] .button,
html[lang="vi"] .language-switcher button {
    font-family: 'Bellota', sans-serif;
}

/* Vietnamese button always uses Vietnamese-compatible font */
.language-switcher button[data-lang="vi"] {
    font-family: 'Bellota', sans-serif;
}

html[lang="vi"] h1,
html[lang="vi"] h2,
html[lang="vi"] h3,
html[lang="vi"] h4,
html[lang="vi"] h5,
html[lang="vi"] h6,
html[lang="vi"] .section-title,
html[lang="vi"] .hero__title,
html[lang="vi"] .hero__brand,
html[lang="vi"] .problem__sticky-title h2,
html[lang="vi"] .problem__float-title,
html[lang="vi"] .problem__card h3,
html[lang="vi"] .solution__title,
html[lang="vi"] .comparison-module__title,
html[lang="vi"] .comparison-card h4,
html[lang="vi"] .benefit-item h3,
html[lang="vi"] .cta__title {
    font-family: 'Philosopher', serif;
}