body {
    background-color: var(--bg-color);
    overflow-x: hidden;
}

.frame-hero {
    height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding: 0 2rem;
}

.hello-title {
    font-family: var(--font-serif);
    font-size: clamp(3.5rem, 9vw, 8rem);
    line-height: 1;
    color: var(--text-main);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards 0.2s;
}

    .hello-title span {
        display: block;
    }

.hello-accent {
    color: var(--accent);
    font-style: italic;
}

.hello-sub {
    font-family: var(--font-sans);
    font-size: clamp(1rem, 2vw, 1.3rem);
    line-height: 1.6;
    max-width: 700px;
    color: #555;
    margin-top: 3rem;
    opacity: 0;
    animation: fadeUp 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards 0.6s;
}

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

.monologue-section {
    height: 450vh;
    position: relative;
    background: var(--bg-color);
}

.sticky-stage {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1500px;
}

.frame-assembly {
    width: min(1100px, 92vw);
    height: min(78vh, 820px);
    position: relative;
    margin-left: auto;
    margin-right: auto;
}

    .frame-assembly canvas {
        display: block;
        width: 100% !important;
        height: 100% !important;
    }

:root {
    --frame-depth: 28px;
    --frame-depth-z: 28px;
    --beam-thickness: 10%;
    --paper-depth: 2px;
}

.frame-box {
    position: relative;
    transform-style: preserve-3d;
}

    .frame-box .face {
        position: absolute;
        display: block;
        backface-visibility: hidden;
        background-image: url('../img/frame-wood.jpg');
        background-size: cover;
        background-position: center;
    }

        .frame-box .face.front,
        .frame-box .face.back {
            inset: 0;
        }

        .frame-box .face.front {
            transform: translateZ(calc(var(--frame-depth-z) / 2));
            filter: brightness(1.00);
        }

        .frame-box .face.back {
            transform: rotateY(180deg) translateZ(calc(var(--frame-depth-z) / 2));
            filter: brightness(0.72);
        }

        .frame-box .face.left,
        .frame-box .face.right {
            top: 0;
            bottom: 0;
            width: var(--frame-depth-z);
            filter: brightness(0.78);
            box-shadow: inset 0 0 20px rgba(0,0,0,0.35);
        }

        .frame-box .face.left {
            left: 0;
            transform-origin: left center;
            transform: translateX(-50%) rotateY(-90deg) translateZ(calc(var(--frame-depth-z) / 2));
        }

        .frame-box .face.right {
            right: 0;
            transform-origin: right center;
            transform: translateX(50%) rotateY(90deg) translateZ(calc(var(--frame-depth-z) / 2));
        }

        .frame-box .face.top,
        .frame-box .face.bottom {
            left: 0;
            right: 0;
            height: var(--frame-depth-z);
            filter: brightness(0.78);
            box-shadow: inset 0 0 20px rgba(0,0,0,0.35);
        }

        .frame-box .face.top {
            top: 0;
            transform-origin: center top;
            transform: translateY(-50%) rotateX(90deg) translateZ(calc(var(--frame-depth-z) / 2));
        }

        .frame-box .face.bottom {
            bottom: 0;
            transform-origin: center bottom;
            transform: translateY(50%) rotateX(-90deg) translateZ(calc(var(--frame-depth-z) / 2));
        }

    .frame-box .face {
        transform-style: preserve-3d;
    }

.front-shadow {
    position: absolute;
    inset: 0;
    box-shadow: 15px 15px 50px rgba(0,0,0,0.3);
    pointer-events: none;
    clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 0%, 10% 10%, 90% 10%, 90% 90%, 10% 90%, 10% 10%);
}

.frame-voice {
    position: absolute;
    background: rgba(255,255,255,0.95);
    padding: 2rem;
    border-left: 4px solid var(--accent);
    box-shadow: 0 20px 50px rgba(0,0,0,0.08);
    font-family: var(--font-serif);
    font-size: 1.4rem;
    color: var(--text-main);
    opacity: 0;
    transform: translateY(30px);
    transition: 0.5s cubic-bezier(0.19, 1, 0.22, 1);
    max-width: 400px;
    pointer-events: none;
    font-style: italic;
}

    .frame-voice.speaking {
        opacity: 1;
        transform: translateY(0);
    }

.voice-tag {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    text-transform: uppercase;
    color: #888;
    margin-bottom: 0.8rem;
    letter-spacing: 0.2em;
    font-weight: 700;
    font-style: normal;
}

.voice-intro {
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%) translateY(30px);
    text-align: center;
    border-left: none;
    border-bottom: 4px solid var(--accent);
    width: 100%;
    max-width: 600px;
}

    .voice-intro.speaking {
        transform: translateX(-50%) translateY(0);
    }

.voice-magnets {
    top: 25%;
    right: 5%;
    text-align: right;
    border-left: none;
    border-right: 4px solid var(--accent);
}

.voice-art {
    top: 50%;
    left: 5%;
}

.voice-wood {
    bottom: 20%;
    right: 10%;
    text-align: right;
    border-left: none;
    border-right: 4px solid var(--accent);
}

.dual-nature-section {
    padding: 10rem 5vw;
    background-color: var(--bg-color);
}

.dual-header {
    text-align: center;
    margin-bottom: 5rem;
}

    .dual-header h2 {
        font-size: 3rem;
    }

.dual-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.use-case {
    position: relative;
    height: 600px;
    overflow: hidden;
    background: #fff;
    display: flex;
    align-items: flex-end;
    padding: 3rem;
    transition: 0.5s;
}

.use-case-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s;
}

.use-case:hover .use-case-img {
    transform: scale(1.05);
}

.use-case-txt {
    position: relative;
    z-index: 2;
    background: #fff;
    padding: 2rem;
    width: 100%;
}

.use-case-title {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.use-case-p {
    font-size: 0.95rem;
    color: #666;
    margin: 0;
}

.dna-section {
    padding: 4rem 5vw 10rem 5vw;
    background: var(--bg-color);
}

.dna-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    max-width: 1200px;
    margin: 4rem auto 0 auto;
    border: 1px solid #ddd;
}

.dna-tile {
    position: relative;
    padding: 4rem 2rem;
    text-align: center;
    background: transparent;
    border-right: 1px solid transparent;
    border-bottom: 1px solid transparent;
}

    .dna-tile::before {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0%;
        height: 1px;
        background: #ccc;
        transition: width 1s ease;
    }

    .dna-tile:not(:nth-child(3n))::after {
        content: '';
        position: absolute;
        top: 0;
        right: 0;
        width: 1px;
        height: 0%;
        background: #ccc;
        transition: height 1s ease 0.3s;
    }

.dna-grid.active .dna-tile::before {
    width: 100%;
}

.dna-grid.active .dna-tile:not(:nth-child(3n))::after {
    height: 100%;
}

.dna-tile:hover {
    background: #fff;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
    z-index: 2;
}

.dna-content {
    transform: translateY(20px);
    transition: 0.8s ease 0.8s;
}

.dna-grid.active .dna-content {
    opacity: 1;
    transform: translateY(0);
}

.dna-icon {
    width: 48px;
    height: 48px;
    stroke: var(--text-main);
    stroke-width: 1.5;
    fill: none;
    margin-bottom: 2rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.dna-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: #888;
    display: block;
    margin-bottom: 0.5rem;
}

.dna-value {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--text-main);
}

.cta-frame {
    padding: 4rem 5vw 10rem 5vw;
    background: var(--bg-color);
    text-align: center;
}

.btn-frame-cta {
    background-color: var(--text-main);
    color: #fff;
    border: 1px solid var(--text-main);
}

    .btn-frame-cta:hover {
        background-color: transparent;
        color: var(--text-main);
    }

@media (max-width: 900px) {
    .hello-title {
        font-size: 3.5rem;
    }

    .stage-section {
        height: 350vh;
    }

    .frame-assembly {
        width: 40vh;
        height: 40vh;
    }

    .fb-top, .fb-bottom {
        height: 8%;
    }

    .fb-left, .fb-right {
        width: 8%;
    }

    .front-shadow {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 0%, 8% 8%, 92% 8%, 92% 92%, 8% 92%, 8% 8%);
    }

    .frame-voice {
        padding: 1.5rem;
        font-size: 1.1rem;
        max-width: 250px;
    }

    .voice-magnets {
        top: 15%;
        right: 5%;
    }

    .voice-art {
        top: 45%;
        left: 5%;
    }

    .voice-wood {
        bottom: 15%;
        right: 5%;
    }

    .dual-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .use-case {
        height: 450px;
        padding: 1.5rem;
    }

    .dna-section {
        padding: 3rem 2rem 6rem 2rem;
    }

    .dna-grid {
        grid-template-columns: 1fr;
        border: none;
    }

    .dna-tile {
        padding: 1.2rem 0;
        text-align: left;
        border-right: none !important;
        border-bottom: 1px solid #ddd !important;
    }

        .dna-tile::before, .dna-tile::after {
            display: none;
        }

    .dna-content {
        opacity: 1;
        transform: none;
        transition: none;
        display: flex;
        align-items: center;
        gap: 1.5rem;
    }

    .dna-icon {
        margin: 0;
        width: 32px;
        height: 32px;
    }

    .dna-text-group {
        display: flex;
        flex-direction: column;
    }

    .dna-label {
        margin-bottom: 0.2rem;
    }

    .dna-value {
        font-size: 1.3rem;
    }

    .cta-frame {
        padding: 3rem 2rem 4rem 2rem !important;
    }
}