* {
    box-sizing: border-box;
}

:root {
    --radius-md: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
}

body {
    margin: 0;
    color: #f5f3ef;
    font-family: 'Oswald', 'Hiragino Sans', 'Yu Gothic', 'Noto Sans JP', sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
}

div {
    font-size: 1.7rem;
    font-weight: 600;
}

img {
    display: block;
    max-width: 100%;
}

.bg {
    min-height: 100svh;
    position: relative;
    display: grid;
    place-items: center;
    padding: clamp(24px, 5vw, 64px);
    overflow: hidden;
}

.bg-media {
    position: absolute;
    inset: 0;
    z-index: -2;
}

.bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    filter: saturate(0.9) contrast(1.08) brightness(0.62);
    transform: scale(1.04);
}

.bg-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(7, 10, 18, 0.35) 0%, rgba(7, 10, 18, 0.72) 58%, rgba(7, 10, 18, 0.92) 100%);
}

.bg-content {
    width: min(100%, 980px);
    display: grid;  
    place-items: center;
    text-align: center;
    gap: clamp(14px, 2.2vw, 24px);
    padding: clamp(20px, 4vw, 40px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(8, 10, 16, 0.4);
    backdrop-filter: blur(16px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    border-radius: var(--radius-md);
}

.logo-image {
    width: min(78vw, 460px);
    height: auto;
}

.title {
    margin: 0;
    font-size: clamp(3.2rem, 11vw, 7.5rem);
    line-height: 0.95;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 700;
}

.subtitle {
    margin: 0;
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 500;
}

.countdown-card {
    width: min(100%, 760px);
    display: grid;
    gap: 14px;
    padding: clamp(18px, 3vw, 28px);
    border-radius: var(--radius-md);
}

.countdown-title {
    margin: 0;
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    letter-spacing: 0.18em;
}

.countdown-timer {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.time-block {
    display: grid;
    gap: 8px;
    padding: 18px 8px 16px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.time-block span:first-child {
    font-size: clamp(2rem, 6vw, 4rem);
    line-height: 1;
    letter-spacing: 0.06em;
}

.label {
    font-size: 0.95rem;
    letter-spacing: 0.18em;
    color: rgba(245, 243, 239, 0.78);
}

.day {
    margin: 0;
    font-size: 0.95rem;
    letter-spacing: 0.14em;
    color: rgba(245, 243, 239, 0.7);
}


@media (max-width: 720px) {
    .bg {
        padding: 18px;
    }

    div {
        font-size: 1.1rem;
    }

    .bg-content {
        width: 100%;
        padding: 18px 16px 20px;
        border-radius: var(--radius-md);
    }

    .countdown-timer {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .time-block {
        padding: 16px 8px 14px;
        border-radius: var(--radius-md);
    }
}

@media (max-width: 420px) {
    div {
        font-size: 1rem;
    }

    .countdown-timer {
        gap: 10px;
    }

    .time-block span:first-child {
        font-size: 1.8rem;
    }
}

.sns {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 12px;
    align-items: center;
}

.sns a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.sns img {
    width: 1.5rem;
    height: 1.5rem;
}

.sns p {
    margin: 0 0 0 0.75rem;
}

.about-theme {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: calc(var(--radius-md) - 4px);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(8, 10, 16, 0.35);
    backdrop-filter: blur(14px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    letter-spacing: 0.14em;
    cursor: pointer;
    user-select: none;
}

.button:active {
    transform: translateY(1px);
}

.popup-background {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(7, 10, 18, 0.72);
    backdrop-filter: blur(2px);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.popup {
    z-index: 101;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(92vw, 860px);
    max-height: min(82svh, 720px);
    padding: 56px 18px 18px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    color: inherit;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(8, 10, 16, 0.72);
    backdrop-filter: blur(18px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
    -webkit-tap-highlight-color: transparent;
}

.popup > .close-button {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    color: rgba(245, 243, 239, 0.85);
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
}

.popup > .close-button:active {
    transform: translateY(1px);
}

.popup > .content {
    padding: 0 6px 6px 6px;
    flex: 1 1 auto;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    text-align: left;
    font-size: 1.05rem;
    font-weight: 400;
}

.popup > .content div {
    font-size: 1.05rem;
    font-weight: 400;
}

.popup > .content p {
    margin: 0.9em 0;
}

.popup-image {
    width: 100%;
    height: auto;
    border-radius: calc(var(--radius-md) - 6px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.35);
}

.popup-flag {
        position: fixed;
        top: 0;
        left: 0;
        width: 1px;
        height: 1px;
        opacity: 0;
        pointer-events: none;
}

.popup-flag:not(:checked) + .popup-background {
        display: none;
}

.popup-flag:not(:checked) + .popup-background + .popup {
        display: none;
}

@media (max-width: 720px) {
        .popup {
                width: min(94vw, 720px);
        padding: 54px 14px 14px;
                max-height: 84svh;
        }

        .popup > .content {
        padding: 0 4px 4px 4px;
                font-size: 1rem;
        }

        .popup > .content div {
            font-size: 1rem;
        }
}

.button-container{
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-direction: column;
}
.button-container > *{
  margin : 15px;
}