/* ------------------------------------------------------------------
   Home page
   Sections are full-height panels laid out in normal flow with native
   scroll snapping, so paging feels like the old version but scrolls
   with the browser's own physics instead of hijacked wheel events.
   ------------------------------------------------------------------ */

html {
    scroll-snap-type: y mandatory;
    scroll-padding-top: var(--nav-h);
    scroll-behavior: smooth;
    background-color: var(--ink);
}

body {
    background-color: var(--ink);
}

@media (max-width: 1023px), (max-height: 640px) {
    /* Small screens: sections are often taller than the viewport, so only
       snap when the user lands close to a boundary. */
    html { scroll-snap-type: y proximity; }
}

.content {
    background-color: var(--ink);
    color: #fff;
}

.content .wrap {
    padding: 0 20%;
}

.page_ele {
    position: relative;
    min-height: calc(100vh - var(--nav-h));
    min-height: calc(100svh - var(--nav-h));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    scroll-snap-align: start;
    overflow: hidden;
}

p {
    font-size: large;
    line-height: 1.6;
    padding: 1% 0;
    margin: 0.5em 0;
}

a {
    color: #fff;
    text-decoration: none;
}

/* ---------- Reveal-on-scroll ---------- */
/* Only hidden when JS is running (html.js), so content never disappears
   if the script fails. home.js tags children with .reveal and sets --i. */

.js .reveal {
    opacity: 0;
    transform: translateY(28px);
    filter: blur(6px);
    transition:
        opacity var(--dur-slow) var(--ease-out),
        transform var(--dur-slow) var(--ease-out),
        filter var(--dur-slow) var(--ease-out);
    transition-delay: calc(var(--i, 0) * 70ms);
}

.js .in-view .reveal {
    opacity: 1;
    transform: none;
    filter: none;
}

/* ---------- Hero ---------- */

.wrap.full-screen {
    text-align: center;
    isolation: isolate;
}

/* Slow-drifting light behind the hero headline */
.wrap.full-screen::before {
    content: "";
    position: absolute;
    inset: -20%;
    z-index: -1;
    background:
        radial-gradient(40% 35% at 30% 40%, rgba(0, 123, 255, 0.22), transparent 70%),
        radial-gradient(35% 30% at 70% 65%, rgba(255, 255, 255, 0.08), transparent 70%);
    animation: hero-drift 18s var(--ease-in-out) infinite alternate;
    pointer-events: none;
}

@keyframes hero-drift {
    0%   { transform: translate3d(-4%, -2%, 0) rotate(0deg) scale(1); }
    50%  { transform: translate3d(3%, 4%, 0) rotate(8deg) scale(1.08); }
    100% { transform: translate3d(5%, -3%, 0) rotate(-6deg) scale(1); }
}

.wrap h1 {
    font-size: clamp(2.75rem, 8vw, 100px);
    line-height: 1.05;
    letter-spacing: -0.03em;
    padding: 2% 0;
    margin: 0;
}

/* Hero headline is split into words by home.js */
.hero-word {
    display: inline-block;
    opacity: 0;
    transform: translateY(0.6em) rotate(2deg);
    filter: blur(10px);
    animation: word-in 0.9s var(--ease-out) forwards;
    animation-delay: calc(150ms + var(--w) * 90ms);
}

@keyframes word-in {
    to { opacity: 1; transform: none; filter: none; }
}

#mobi-use-instruction,
#pc-use-instruction {
    display: none;
    font-weight: normal;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.85rem;
    opacity: 0.7;
}

#big-arrow {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-top: 4vh;
    padding: 0;
    opacity: 0;
    animation: fade-in 1s var(--ease-out) 1.1s forwards;
    transition: opacity var(--dur) var(--ease-out);
}

#big-arrow:hover {
    opacity: 0.8;
}

#big-arrow img {
    width: 56px;
    height: 30px;
    animation: bob 2.2s var(--ease-in-out) infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(10px); }
}

@keyframes fade-in {
    to { opacity: 1; }
}

/* ---------- Generic sections ---------- */

.sub-wrap {
    background-color: var(--paper);
    color: #000;
    padding: 0 20%;
}

.sub-wrap-black {
    background-color: var(--ink);
    color: #fff;
    padding: 0 20%;
}

.sub-wrap h1, .sub-wrap-black h1 {
    font-size: clamp(2rem, 4.5vw, 60px);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.content-wrapper {
    width: 100%;
    padding: 6vh 5% 8vh;
}

.flex-wrap {
    padding-top: 5%;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 4%;
}

.flex-wrap img {
    border-radius: 50%;
}

#my_pic {
    width: clamp(120px, 20%, 260px);
    height: auto;
    aspect-ratio: 1;
    object-fit: cover;
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.35);
    transition: transform var(--dur-slow) var(--ease-spring), box-shadow var(--dur-slow) var(--ease-out);
}

#my_pic:hover {
    transform: scale(1.05) rotate(-3deg);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.45);
}

.proj-detail-wrap {
    padding: 1% 3%;
}

/* ---------- Video ---------- */

.iframe_container {
    position: relative;
    overflow: hidden;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 16px;
    box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.4);
}

iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* ---------- Experience slider ---------- */

.slider-wrapper {
    position: relative;
}

.slider-wrapper .slide-button {
    position: absolute;
    top: 50%;
    outline: none;
    border: 1px solid rgba(255, 255, 255, 0.15);
    height: 52px;
    width: 52px;
    z-index: 10;
    color: #fff;
    display: flex;
    cursor: pointer;
    font-size: 1.6rem;
    background: rgba(0, 0, 0, 0.55);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transform: translateY(-50%);
    transition:
        opacity var(--dur) var(--ease-out),
        transform var(--dur) var(--ease-spring),
        background-color var(--dur) var(--ease-out);
}

.slider-wrapper .slide-button:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: translateY(-50%) scale(1.1);
}

.slider-wrapper .slide-button:active {
    transform: translateY(-50%) scale(0.92);
}

.slider-wrapper .slide-button.is-hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50%) scale(0.6);
}

.slider-wrapper .slide-button#prev-slide { left: -26px; }
.slider-wrapper .slide-button#next-slide { right: -26px; }

.slider-wrapper .image-list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 18px;
    list-style: none;
    padding: 12px 0;
    margin: 0 0 24px;
    overflow-x: auto;
    scrollbar-width: none;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    overscroll-behavior-x: contain;
}

.slider-wrapper .image-list::-webkit-scrollbar {
    display: none;
}

.img_container {
    position: relative;
    display: inline-block;
    border-radius: 18px;
    overflow: hidden;
    scroll-snap-align: start;
    cursor: pointer;
    box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
    transition: transform var(--dur-slow) var(--ease-out), box-shadow var(--dur-slow) var(--ease-out);
}

.img_container:hover {
    transform: translateY(-6px);
    box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.75);
}

/* Gradient that rises from the bottom on hover, behind the caption */
.img_container::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.1) 55%, transparent 100%);
    opacity: 0;
    transition: opacity var(--dur-slow) var(--ease-out);
    pointer-events: none;
}

.img_container:hover::after {
    opacity: 1;
}

.slider-wrapper .image-list .image-item {
    display: block;
    width: 500px;
    height: 600px;
    object-fit: cover;
    cursor: pointer;
    transition: transform 1.2s var(--ease-out);
}

.img_container:hover .image-item {
    transform: scale(1.06);
}

.desc {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    color: white;
    padding: 24px;
    font-size: 1.25rem;
    font-weight: bold;
    letter-spacing: -0.01em;
    z-index: 6;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}

.img_container:hover .desc {
    opacity: 1;
    transform: none;
}

.slider-scrollbar {
    height: 24px;
    width: 100%;
    display: flex;
    align-items: center;
}

.slider-scrollbar .scrollbar-track {
    background: rgba(255, 255, 255, 0.2);
    width: 100%;
    height: 3px;
    display: flex;
    align-items: center;
    border-radius: 4px;
    position: relative;
    transition: height var(--dur) var(--ease-out);
}

.slider-scrollbar:hover .scrollbar-track {
    height: 6px;
}

.slider-scrollbar .scrollbar-thumb {
    position: absolute;
    background: #fff;
    top: 0;
    bottom: 0;
    width: 50%;
    height: 100%;
    cursor: grab;
    border-radius: inherit;
    touch-action: none;
}

.slider-scrollbar .scrollbar-thumb:active {
    cursor: grabbing;
}

.slider-scrollbar .scrollbar-thumb::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -10px;
    bottom: -10px;
}

@media (hover: none) {
    /* No hover on touch screens: keep captions visible */
    .img_container::after,
    .desc {
        opacity: 1;
        transform: none;
    }
}

/* ---------- Project detail panel (modal) ---------- */

.dim-background {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.45);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur) var(--ease-out), visibility 0s linear var(--dur);
}

.dim-background.active {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--dur) var(--ease-out), visibility 0s;
}

.panel {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 85vw;
    height: 85vh;
    overflow-y: auto;
    background-color: white;
    padding: 32px;
    border-radius: 20px;
    box-shadow: 0 40px 120px -20px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    color: #888;
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, -46%) scale(0.96);
    transition:
        opacity var(--dur) var(--ease-out),
        transform var(--dur) var(--ease-out),
        visibility 0s linear var(--dur);
}

.panel.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%);
    transition:
        opacity var(--dur-slow) var(--ease-out),
        transform var(--dur-slow) var(--ease-spring),
        visibility 0s;
}

/* Panel contents cascade in after the panel opens */
.panel > * {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}

.panel.active > * {
    opacity: 1;
    transform: none;
    transition-duration: var(--dur-slow);
}

.panel.active > :nth-child(2) { transition-delay: 80ms; }
.panel.active > :nth-child(3) { transition-delay: 130ms; }
.panel.active > :nth-child(4) { transition-delay: 180ms; }
.panel.active > :nth-child(5) { transition-delay: 240ms; }

.close-btn {
    display: inline-block;
    position: absolute;
    width: 22px;
    height: 22px;
    top: 28px;
    right: 28px;
    padding: 0;
    cursor: pointer;
    z-index: 2;
    transition: transform var(--dur) var(--ease-spring), opacity var(--dur) var(--ease-out) !important;
}

.close-btn:hover {
    transform: rotate(90deg) scale(1.1) !important;
    opacity: 0.6 !important;
}

.image-panel {
    width: 500px;
    height: 600px;
    max-width: 100%;
    object-fit: cover;
    border-radius: 14px;
}

h2 {
    color: #000;
}

.panel div {
    color: #000;
}

.panel .flex-wrap img {
    border-radius: 14px;
}

@media screen and (max-width: 1250px) {
    .flex-wrap {
        flex-direction: column;
    }

    .detail-wrap p {
        font-size: 15px;
    }

    .image-wrap img {
        width: 70vw;
    }

    .page_ele {
        padding: 0 5% !important;
    }
}

/* ---------- Tech stack cards ---------- */

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    --mx: 50%;
    --my: 50%;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.03);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition:
        transform var(--dur-slow) var(--ease-out),
        box-shadow var(--dur-slow) var(--ease-out),
        border-color var(--dur-slow) var(--ease-out),
        opacity var(--dur-slow) var(--ease-out),
        filter var(--dur-slow) var(--ease-out);
}

/* Spotlight that follows the cursor (position set by home.js) */
.card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(420px circle at var(--mx) var(--my), rgba(255, 255, 255, 0.12), transparent 45%);
    opacity: 0;
    transition: opacity var(--dur) var(--ease-out);
    pointer-events: none;
    z-index: 1;
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 30px 60px -25px rgba(0, 0, 0, 0.7);
}

.card:hover::before {
    opacity: 1;
}

.card img {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    display: block;
    padding: 12%;
    object-fit: contain;
    transition: transform var(--dur-slow) var(--ease-out), opacity var(--dur-slow) var(--ease-out);
}

.card:hover img {
    transform: scale(0.92);
    opacity: 0.25;
}

.card-content {
    padding: 20px;
    transition: opacity var(--dur-slow) var(--ease-out);
}

.card:hover .card-content h3,
.card:hover .card-content p:not(.card-desc) {
    opacity: 0.6;
}

.card-content h3 {
    margin-top: 0;
    transition: opacity var(--dur) var(--ease-out);
}

.card-content p {
    transition: opacity var(--dur) var(--ease-out);
}

.card-desc {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    margin: 0;
    padding: 28px 24px;
    color: #000;
    background-color: rgba(255, 255, 255, 0.94);
    font-weight: bold;
    font-size: 0.98rem;
    line-height: 1.5;
    z-index: 6;
    clip-path: inset(0 0 100% 0 round 0 0 16px 16px);
    transition: clip-path var(--dur-slow) var(--ease-out);
}

.card:hover .card-desc {
    clip-path: inset(0 0 0 0 round 0 0 16px 16px);
}

@media (hover: none) {
    .card-desc {
        position: static;
        clip-path: none;
        background: transparent;
        color: inherit;
        font-weight: normal;
        padding: 0 20px 20px;
    }
}

.btn {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color var(--dur) var(--ease-out);
}

/* ---------- TaskForge call-to-action ---------- */

.cta-link {
    display: inline-block;
    color: var(--accent) !important;
    position: relative;
    transition: transform var(--dur) var(--ease-out);
}

.cta-link h1 {
    display: inline-block;
    color: var(--accent);
    margin: 0;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 3px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size var(--dur-slow) var(--ease-out);
}

.cta-link:hover h1 {
    background-size: 100% 3px;
}

.cta-link .cta-arrow {
    display: inline-block;
    transition: transform var(--dur) var(--ease-spring);
}

.cta-link:hover .cta-arrow {
    transform: translateX(8px);
}

.forge-shot {
    display: block;
    width: 80%;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 30px 70px -25px rgba(0, 0, 0, 0.45);
    transition: transform var(--dur-slow) var(--ease-out), box-shadow var(--dur-slow) var(--ease-out);
}

.forge-shot img {
    display: block;
    width: 100%;
    transition: transform 1.2s var(--ease-out);
}

.forge-shot:hover {
    transform: translateY(-6px);
    box-shadow: 0 40px 80px -25px rgba(0, 0, 0, 0.55);
}

.forge-shot:hover img {
    transform: scale(1.03);
}

/* ---------- Section rail (up / dots / down) ---------- */

.section-rail {
    position: fixed;
    right: clamp(12px, 2vw, 32px);
    top: 50%;
    transform: translateY(-50%);
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    color: #fff;
    mix-blend-mode: difference; /* stays visible on both light and dark sections */
    opacity: 0;
    animation: fade-in 0.8s var(--ease-out) 1.4s forwards;
}

.rail-arrow {
    background: none;
    border: none;
    padding: 6px;
    color: inherit;
    cursor: pointer;
    line-height: 0;
    transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-spring);
}

.rail-arrow svg {
    width: 20px;
    height: 20px;
}

.rail-arrow:hover {
    transform: scale(1.2);
}

.rail-arrow[data-dir="up"]:hover { transform: translateY(-3px) scale(1.2); }
.rail-arrow[data-dir="down"]:hover { transform: translateY(3px) scale(1.2); }

.rail-arrow.is-hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.6);
}

.rail-dots {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.rail-dot {
    width: 8px;
    height: 8px;
    padding: 0;
    border: none;
    border-radius: 999px;
    color: inherit;
    background: currentColor;
    opacity: 0.35;
    cursor: pointer;
    transition:
        height var(--dur-slow) var(--ease-spring),
        opacity var(--dur) var(--ease-out);
}

.rail-dot:hover {
    opacity: 0.7;
}

.rail-dot.active {
    height: 28px;
    opacity: 1;
}

@media (max-width: 1023px) {
    .slider-wrapper .slide-button {
        display: none !important;
    }
    .slider-wrapper .image-list {
        gap: 10px;
        margin-bottom: 15px;
    }
    .slider-wrapper .image-list .image-item {
        height: 50vh;
        width: 70vw;
        max-width: 420px;
    }
    .slider-scrollbar .scrollbar-thumb {
        width: 20%;
    }
    .section-rail {
        right: 8px;
        gap: 10px;
    }
    .rail-arrow {
        display: none;
    }
    .forge-shot {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .js .reveal,
    .hero-word {
        opacity: 1;
        transform: none;
        filter: none;
    }
    .wrap.full-screen::before,
    #big-arrow img {
        animation: none;
    }
}