@font-face {
    font-family: 'Wii';
    src: url('contm.ttf') format('truetype');
}

:root {
    color-scheme: light;
    --ink: #17202a;
    --muted: #657386;
    --panel: rgba(255, 255, 255, 0.94);
    --panel-strong: #ffffff;
    --line: rgba(23, 32, 42, 0.14);
    --blue: #2477e6;
    --blue-dark: #1558b0;
    --green: #21a67a;
    --coral: #ef6351;
    --amber: #f4b942;
    --shadow: 0 24px 70px rgba(26, 39, 56, 0.22);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

::selection {
    background: rgba(36, 119, 230, 0.22);
}

html,
body {
    min-height: 100%;
    overflow: hidden;
}

body {
    font-family: Wii, "Trebuchet MS", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 12% 18%, rgba(244, 185, 66, 0.32), transparent 26vw),
        radial-gradient(circle at 86% 12%, rgba(36, 119, 230, 0.22), transparent 28vw),
        linear-gradient(135deg, #f8fbff 0%, #edf3f8 52%, #f8f1e8 100%);
    margin: 0;
    width: 100vw;
    height: 100vh;
}

button,
input,
a {
    font: inherit;
}

button,
a,
input[type="checkbox"],
input[type="range"] {
    cursor: pointer;
}

.shadow {
    box-shadow: 0 16px 48px rgba(13, 30, 51, 0.28);
}

#vignette {
    position: absolute;
    inset: 0;
    z-index: -1;
    box-shadow: inset 0 0 90px rgba(16, 31, 48, 0.12);
    pointer-events: none;
}

#backgroundTex,
#backgroundYellow,
#backgroundStars {
    position: absolute;
    inset: 0;
    width: 100vw;
    height: 100vh;
}

#backgroundTex {
    z-index: -3;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.56) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.56) 1px, transparent 1px);
    background-size: 42px 42px;
    opacity: 0.5;
}

#backgroundYellow {
    z-index: -3;
    background:
        linear-gradient(110deg, rgba(33, 166, 122, 0.1), transparent 40%),
        linear-gradient(260deg, rgba(239, 99, 81, 0.12), transparent 48%);
}

#backgroundStars {
    z-index: -2;
    background-image: radial-gradient(circle, rgba(23, 32, 42, 0.2) 1px, transparent 1.5px);
    background-size: 28px 28px;
    opacity: 0.16;
    animation: bgStarMove 18s infinite linear;
}

@keyframes bgStarMove {
    0% { background-position-x: 0; }
    100% { background-position-x: 28px; }
}

#loading {
    position: absolute;
    inset: 0;
    z-index: 100;
    display: none;
    justify-content: center;
    align-items: center;
    background: rgba(248, 251, 255, 0.74);
    backdrop-filter: blur(10px);
    pointer-events: none;
    user-select: none;
}

.loader {
    width: 54px;
    height: 54px;
    border: 5px solid rgba(36, 119, 230, 0.18);
    border-top-color: var(--blue);
    border-radius: 50%;
    animation: spin 800ms linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#creditsBottom {
    position: absolute;
    bottom: 18px;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 5;
    gap: 4px;
    color: rgba(23, 32, 42, 0.72);
    font-size: 0.9rem;
    text-decoration: none;
    pointer-events: none;
}

#creditsBottom a {
    color: inherit;
    pointer-events: auto;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

#creditsBottom a:hover {
    color: var(--blue-dark);
}

.main-btn {
    width: 100%;
    min-height: 3.35rem;
    padding: 0.85rem 1rem;
    position: relative;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border: 1px solid rgba(21, 88, 176, 0.28);
    border-radius: var(--radius);
    background: linear-gradient(180deg, #ffffff 0%, #e8f2ff 100%);
    color: var(--ink);
    box-shadow: 0 9px 0 rgba(21, 88, 176, 0.16), 0 16px 28px rgba(22, 45, 72, 0.14);
    overflow: hidden;
    transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}

.main-btn:is(:hover, :focus-visible) {
    border-color: rgba(36, 119, 230, 0.64);
    box-shadow: 0 6px 0 rgba(21, 88, 176, 0.16), 0 18px 34px rgba(22, 45, 72, 0.18);
    transform: translateY(2px);
}

.main-btn:focus-visible {
    outline: 3px solid rgba(36, 119, 230, 0.32);
    outline-offset: 3px;
}

.main-btn-fade,
.main-btn-pattern {
    display: none;
}

.main-btn-text {
    position: relative;
    z-index: 2;
    font-size: 1.08rem;
    color: var(--ink);
    line-height: 1.1;
    text-align: center;
}

.main-btn-text-letter {
    display: inline-flex;
    position: relative;
}

.main-btn:is(:hover, :focus-visible) .main-btn-text-letter {
    animation: bounce 900ms ease;
}

@keyframes bounce {
    0%, 100% { translate: 0 0; }
    45% { translate: 0 -10%; }
}

#upload-mpo-btn {
    width: 100%;
    margin-bottom: 22px;
    background: linear-gradient(180deg, #2f86f6 0%, #1766ca 100%);
    border-color: rgba(10, 63, 130, 0.24);
}

#upload-mpo-btn .main-btn-text {
    color: #ffffff;
}

.buttonsRow2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.buttonsRow2 .main-btn:first-child {
    margin-right: 0;
}

#instructionsModal,
#initialModal,
#secondScreenContainer {
    width: 100vw;
    height: 100vh;
    position: absolute;
    justify-content: center;
    align-items: center;
    padding: clamp(16px, 4vw, 44px);
}

#instructionsModal {
    z-index: 3;
    display: none;
}

#initialModal {
    display: flex;
}

.mainPopup,
#secondScreenModal,
#viewGifModal {
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: var(--radius);
    background: var(--panel);
    color: var(--ink);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
}

.mainPopup {
    width: min(865px, 94vw);
    padding: clamp(24px, 5vw, 44px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.mainText {
    margin-bottom: 48px;
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1;
    color: var(--ink);
}

.subText {
    width: min(560px, 100%);
    margin: 0 auto;
    padding-top: 18px;
    color: var(--muted);
    font-size: clamp(1rem, 2vw, 1.15rem);
    line-height: 1.45;
}

#instructionsContainer {
    width: min(620px, 100%);
    margin: 0 auto 30px;
}

.instructStep {
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
}

.instructDivider {
    width: 100%;
    height: 1px;
    background-color: var(--line);
    margin: 18px 0;
}

.mainInstruction {
    width: 100%;
    min-height: 112px;
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 18px;
    align-items: center;
    overflow: hidden;
}

.stepBadge {
    width: 100%;
    height: 108px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background:
        linear-gradient(135deg, rgba(36, 119, 230, 0.9), rgba(33, 166, 122, 0.9)),
        var(--blue);
    color: #ffffff;
    font-size: 3.2rem;
    user-select: none;
    box-shadow: 0 10px 24px rgba(24, 36, 52, 0.12);
}

.explain {
    text-align: left;
    font-size: 1.08rem;
    line-height: 1.35;
    color: var(--ink);
}

#secondScreenContainer {
    display: none;
    flex-direction: column;
}

#secondScreenModal {
    display: flex;
    flex-direction: column;
    width: min(1120px, 96vw);
    max-height: 94vh;
    padding: clamp(18px, 3vw, 30px);
    overflow: auto;
}

#differenceLabel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 0 0 18px;
    text-align: center;
}

#differenceLabel span:first-child {
    font-size: clamp(1.8rem, 4vw, 2.7rem);
    line-height: 1;
}

#differenceLabel span:last-child {
    max-width: 720px;
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.4;
}

#differenceControl {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

#adjustAmountLabel,
#adjustAmountLabelVert {
    min-width: 60px;
    padding: 6px 8px;
    display: inline-flex;
    justify-content: center;
    color: var(--muted);
    background: rgba(23, 32, 42, 0.06);
    border-radius: var(--radius);
    font-size: 0.95rem;
}

#differenceContainer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 18px;
    margin: 0 0 18px;
}

#previewCanvasStack {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(23, 32, 42, 0.16);
    border-radius: var(--radius);
    background: #101820;
    box-shadow: 0 18px 42px rgba(16, 31, 48, 0.22);
}

#canvas_overlap {
    position: absolute;
    mix-blend-mode: difference;
    left: 0;
    top: 0;
}

#canvas_bottom {
    display: block;
}

input[type="range"] {
    accent-color: var(--blue);
}

#adjustOverlapVert {
    accent-color: var(--coral);
}

#gifSettingsContainer {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    color: var(--ink);
    font-size: 1rem;
}

.settingField,
.settingToggle {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel-strong);
}

#frameSpeed {
    width: 78px;
    min-height: 34px;
    padding: 5px 8px;
    color: var(--ink);
    border: 1px solid rgba(23, 32, 42, 0.2);
    border-radius: var(--radius);
    background: #ffffff;
}

.settingToggle input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.toggleMark {
    width: 42px;
    height: 24px;
    position: relative;
    display: inline-flex;
    flex-shrink: 0;
    border-radius: 999px;
    background: #c7d2df;
    transition: background 140ms ease;
}

.toggleMark::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0 2px 7px rgba(23, 32, 42, 0.24);
    transition: transform 140ms ease;
}

.settingToggle input:checked + .toggleMark {
    background: var(--green);
}

.settingToggle input:checked + .toggleMark::after {
    transform: translateX(18px);
}

.settingToggle input:focus-visible + .toggleMark {
    outline: 3px solid rgba(36, 119, 230, 0.28);
    outline-offset: 3px;
}

#createGifContainer {
    margin-top: 12px;
}

#createGifContainer button {
    margin-left: 0;
}

#makeAnotherBtn {
    display: none;
}

#viewGIF {
    display: none;
    justify-content: center;
    align-items: center;
    user-select: none;
}

#viewGIF img {
    max-width: 90vw;
    max-height: 70vh;
    border: 3px solid #ffffff;
    border-radius: var(--radius);
    box-sizing: border-box;
    user-select: none;
    pointer-events: none;
}

#viewGifModal {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    position: absolute;
    z-index: 4;
    padding: 22px;
    color: var(--ink);
}

#viewGifModal button {
    margin: 0 12px 22px;
}

.resultActions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.resultActions .main-btn {
    width: 12rem;
}

#viewGifModal a {
    margin-bottom: 4px;
    color: var(--ink);
    text-decoration: underline;
    text-underline-offset: 3px;
}

#viewGifModal a:hover {
    color: var(--blue-dark);
}

@media (max-width: 760px) {
    html,
    body {
        overflow: auto;
    }

    .mainPopup,
    #secondScreenModal {
        width: min(100%, 96vw);
    }

    .mainText {
        margin-bottom: 32px;
    }

    .buttonsRow2 {
        grid-template-columns: 1fr;
    }

    .main-btn {
        width: 100%;
    }

    .mainInstruction {
        grid-template-columns: 1fr;
    }

    .stepBadge {
        height: 160px;
    }

    #differenceContainer {
        gap: 10px;
    }

    #gifSettingsContainer {
        align-items: stretch;
    }

    .settingField,
    .settingToggle {
        width: 100%;
        justify-content: center;
    }
}