*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    border: none;
    outline: none;
    scroll-behavior: smooth;
    font-family: "IBM Plex Sans", sans-serif;
}
:root{
    --cream: #E9D4C3;
    --navy: #13273F;
    --red: #660000;
    --red-arrow: #800000;
    --cocoa: #5C4433;

    --text-color: var(--navy);
    --text-muted: #674635;
    --border-soft: rgba(19, 39, 63, 0.14);
    --shell: 110rem;
    --grid-line: #cfcfcf;
    --card-edge: #674635;
}
html{
    font-size: 62.5%;
    overflow-x: hidden;
}
body{
    background-color: #ffffff;
    background-image:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cline x1='0' y1='0' x2='0' y2='220' stroke='%23cfcfcf' stroke-width='1' stroke-dasharray='4 5'/%3E%3Cline x1='0' y1='0' x2='220' y2='0' stroke='%23cfcfcf' stroke-width='1' stroke-dasharray='4 5'/%3E%3C/svg%3E");
    background-size: 220px 220px;
    background-position: 110px 110px;
    background-attachment: fixed;
    color: var(--text-color);
}
a{
    color: inherit;
}
a:focus-visible,
button:focus-visible{
    outline: 2px solid var(--navy);
    outline-offset: 3px;
    border-radius: 0.4rem;
}

.page{
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- header ---------- */
.header{
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 3.2rem 3.2rem 0;
}
.nav-main{
    display: flex;
    gap: 2.4rem;
}
.nav-main a{
    font-size: 1.4rem;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.25s ease;
}
.nav-main a:hover{
    color: var(--text-color);
}
.logo{
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--navy);
}

/* ---------- hero ---------- */
.hero{
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: var(--shell);
    width: 100%;
    margin: 0 auto;
    padding: 2rem 2.4rem;
}

/* ---------- footer ---------- */
.footer{
    width: 100%;
    padding: 0 3.2rem 3.2rem;
}

.hero-copy{
    display: grid;
    text-align: center;
    padding: 0 4rem;
}
.intro-text,
.project-title{
    grid-area: 1 / 1;
    transition: opacity 0.35s ease;
}
.intro-text{
    line-height: 1.5;
    font-weight: 400;
    color: var(--text-color);
    opacity: 1;
}
.intro-text strong{
    font-weight: 700;
}
.intro-line{
    display: block;
}
.intro-line-1{
    font-size: 2.6rem;
}
.intro-line-2{
    font-size: 2.6rem;
}
.hl-navy{
    color: var(--navy);
}
.hl-red{
    color: var(--red);
}
.project-title{
    font-size: 6.4rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    line-height: 1.1;
    color: var(--cocoa);
    opacity: 0;
}
.hero-copy.showing-project .intro-text{
    opacity: 0;
}
.hero-copy.showing-project .project-title{
    opacity: 1;
}

/* ---------- cards ---------- */
.stack{
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
}
.cards-row{
    list-style: none;
    display: flex;
    justify-content: center;
    margin-top: 6rem;
}
.card-slot{
    flex: 0 0 auto;
    width: 15.6rem;
    aspect-ratio: 3 / 4.4;
    opacity: 0;
    transform: translate(var(--dx, -10rem), var(--dy, -8rem));
    transition: opacity 0.75s cubic-bezier(0.22, 1, 0.36, 1), transform 0.75s cubic-bezier(0.22, 1, 0.36, 1);
}
.card-slot:not(:first-child){
    margin-left: -2.8rem;
}
.card-slot.in{
    opacity: 1;
    transform: translate(0, 0);
}
.card-slot:nth-child(1){ --dx: -14rem; --dy: -10rem; --rot: -2deg; }
.card-slot:nth-child(2){ --dx: -7rem; --dy: -5rem; --rot: -1.2deg; }
.card-slot:nth-child(3){ --dx: -4.7rem; --dy: -3.3rem; --rot: -0.4deg; }
.card-slot:nth-child(4){ --dx: -3.5rem; --dy: -2.5rem; --rot: 0.4deg; }
.card-slot:nth-child(5){ --dx: -2.8rem; --dy: -2rem; --rot: 1.2deg; }
.card-slot:nth-child(6){ --dx: -2.3rem; --dy: -1.7rem; --rot: 2deg; }
.card{
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 1.2rem;
    background: var(--cocoa);
    cursor: pointer;
    border-left: 0.3rem solid var(--card-edge);
    transform: rotate(var(--rot, 0deg));
    transform-origin: 50% 100%;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
}
.card img{
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-slot.idle .card{
    animation: card-float 5.5s ease-in-out infinite;
}
.card-slot.idle:nth-child(2n) .card{
    animation-delay: 0.6s;
}
.card-slot.idle:nth-child(3n) .card{
    animation-delay: 1.2s;
}
@keyframes card-float{
    0%, 100%{ transform: rotate(var(--rot, 0deg)) translateY(0); }
    50%{ transform: rotate(var(--rot, 0deg)) translateY(-0.8rem); }
}

.card:hover,
.card:focus-visible,
.card-slot.idle .card:hover,
.card-slot.idle .card:focus-visible{
    animation: none;
    transform: rotate(var(--rot, 0deg)) translateY(-1.4rem) scale(1.03);
    box-shadow: 0 1.6rem 2.8rem rgba(0, 0, 0, 0.28);
}
.card-slot:hover,
.card-slot:focus-within{
    z-index: 2;
}

.card-cursor-hint{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--cream);
    color: var(--navy);
    font-size: 1.2rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.7rem 1.5rem;
    border-radius: 999px;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: none;
    white-space: nowrap;
}
.card:hover .card-cursor-hint,
.card:focus-visible .card-cursor-hint{
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* ---------- timeline / gradient arrow ---------- */
.timeline-arrow{
    display: block;
    width: calc(100% + 2.4rem);
    height: 4rem;
    margin: 6rem -1.2rem 1.6rem;
}
.arrow-stop-navy{
    stop-color: var(--navy);
}
.arrow-stop-red{
    stop-color: var(--red-arrow);
}
.arrow-navy{
    fill: var(--navy);
}
.arrow-red{
    fill: var(--red-arrow);
}

/* ---------- footer categories ---------- */
.footer-categories{
    display: flex;
    justify-content: space-between;
    gap: 3rem;
}
.category h3{
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}
.category p{
    font-size: 1.2rem;
    color: var(--text-muted);
}
.category-ml h3{
    color: var(--navy);
}
.category-design{
    text-align: right;
}
.category-design h3{
    color: var(--red);
}

/* ---------- socials ---------- */
.socials{
    display: flex;
    gap: 2.2rem;
}
.socials a{
    font-size: 1.4rem;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.25s ease;
}
.socials a:hover{
    color: var(--text-color);
}

/* ---------- generic content pages (about / project) ---------- */
.content{
    flex: 1;
    max-width: 72rem;
    margin: 0 auto;
    padding: 5rem 4rem 8rem;
    width: 100%;
}
.content h1{
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 1.4rem;
}
.content .tag{
    display: inline-block;
    font-size: 1.2rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 2rem;
}
.content p{
    font-size: 1.5rem;
    line-height: 1.7;
    color: var(--text-color);
    margin-bottom: 1.6rem;
}
.content .placeholder-block{
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 1.4rem;
    background: var(--cocoa);
    overflow: hidden;
    margin: 3rem 0;
}
.content .placeholder-block img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.back-link{
    display: inline-block;
    margin-top: 1rem;
    font-size: 1.5rem;
    color: var(--text-muted);
    transition: color 0.25s ease;
}
.back-link:hover{
    color: var(--text-color);
}

@media (prefers-reduced-motion: reduce){
    .card-slot,
    .card,
    .intro-text,
    .project-title{
        transition: none !important;
        animation: none !important;
    }
}

@media (max-width: 860px){
    .nav-main{
        gap: 1.6rem;
    }
    .hero{
        padding: 3.2rem 2.4rem 3rem;
    }
    .hero-copy{
        padding: 0;
    }
    .intro-line-1{
        font-size: 2.2rem;
    }
    .intro-line-2{
        font-size: 2.2rem;
    }
    .project-title{
        font-size: 4rem;
    }
    .stack{
        max-width: 100vw;
    }
    .timeline-arrow{
        width: calc(100% + 1rem);
        margin: 3rem -0.5rem 1.6rem;
    }
    .cards-row{
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        padding-bottom: 1rem;
        margin-top: 3.2rem;
    }
    .card-slot{
        scroll-snap-align: start;
    }
    .footer-categories{
        flex-direction: column;
        gap: 2rem;
        text-align: left;
    }
    .category-design{
        text-align: left;
    }
}

@media (max-width: 520px){
    .intro-line-1{
        font-size: 1.9rem;
    }
    .intro-line-2{
        font-size: 1.9rem;
    }
    .project-title{
        font-size: 3rem;
    }
    .card-slot{
        width: 13rem;
    }
    .content{
        padding: 4rem 2.4rem 6rem;
    }
    .content h1{
        font-size: 2.6rem;
    }
}