/* ========================================
   Timbula Homepage
   Common Styles
======================================== */

:root {
    --bg-main: #080b20;
    --bg-secondary: #0d1230;
    --bg-card: rgba(20, 27, 65, 0.72);

    --text-main: #f5f7ff;
    --text-secondary: #b9c1df;
    --text-muted: #7f89b2;

    --accent: #cbecfb;
    --accent-strong: #a2b0ff;
    --accent-soft: rgba(169, 232, 255, 0.14);

    --border: rgba(169, 232, 255, 0.2);
    --border-strong: rgba(169, 232, 255, 0.42);

    --content-width: 960px;

    --radius-small: 12px;
    --radius-medium: 20px;
    --radius-large: 28px;
}

ul {
    padding-left: 1.2em;
}

/* ========================================
   Page Entrance Animation
======================================== */

main > *,
.site-footer {
    animation: fade-up 0.9s ease-out both;
}

.page-title {
    animation-delay: 0.05s;
}

.page-nav {
    animation-delay: 0.15s;
}

.application-button-wrapper {
    animation-delay: 0.25s;
}

.content-section:nth-of-type(1) {
    animation-delay: 0.35s;
}

.content-section:nth-of-type(2) {
    animation-delay: 0.45s;
}

.final-application {
    animation-delay: 0.55s;
}

.site-footer {
    animation-delay: 0.65s;
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(18px);
    }

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

/* ========================================
   Reset
======================================== */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 32px;
}

body {
    margin: 0;
    min-width: 320px;

    color: var(--text-main);
    background:
        radial-gradient(circle at 15% 20%, rgba(120, 145, 255, 0.14), transparent 25%),
        radial-gradient(circle at 85% 10%, rgba(190, 120, 255, 0.12), transparent 25%),
        radial-gradient(circle at 50% 80%, rgba(80, 180, 255, 0.08), transparent 30%),
        var(--bg-main);

    font-family: "Shippori Mincho", serif;

    line-height: 1.8;
    overflow-x: hidden;
}


/* ========================================
   Starry Background
======================================== */

body::before,
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
}

body::before {
    opacity: 0.78;

    background:
        /* 小さな星 */
        radial-gradient(circle at 5% 8%, rgba(255,255,255,0.65) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 12% 24%, rgba(255,255,255,0.55) 0 0.7px, transparent 1.7px),
        radial-gradient(circle at 19% 61%, rgba(169,232,255,0.6) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 27% 14%, rgba(255,255,255,0.7) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 34% 47%, rgba(215,184,255,0.55) 0 0.7px, transparent 1.7px),
        radial-gradient(circle at 42% 77%, rgba(255,255,255,0.6) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 49% 28%, rgba(169,232,255,0.55) 0 0.7px, transparent 1.7px),
        radial-gradient(circle at 57% 88%, rgba(255,255,255,0.65) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 63% 52%, rgba(215,184,255,0.55) 0 0.7px, transparent 1.7px),
        radial-gradient(circle at 71% 9%, rgba(255,255,255,0.65) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 78% 68%, rgba(169,232,255,0.6) 0 0.8px, transparent 1.8px),
        radial-gradient(circle at 86% 33%, rgba(255,255,255,0.6) 0 0.7px, transparent 1.7px),
        radial-gradient(circle at 93% 82%, rgba(215,184,255,0.55) 0 0.8px, transparent 1.8px),

        /* 中くらいの星 */
        radial-gradient(circle at 15% 47%, rgba(255,255,255,0.85) 0 1.2px, transparent 3px),
        radial-gradient(circle at 38% 19%, rgba(169,232,255,0.75) 0 1.2px, transparent 3px),
        radial-gradient(circle at 58% 63%, rgba(255,255,255,0.8) 0 1.2px, transparent 3px),
        radial-gradient(circle at 82% 24%, rgba(215,184,255,0.75) 0 1.2px, transparent 3px),

        /* 大きく明るい星 */
        radial-gradient(circle at 23% 42%, rgba(190,225,255,0.95) 0 1.5px, rgba(190,225,255,0.15) 4px, transparent 12px),
        radial-gradient(circle at 81% 18%, rgba(220,195,255,0.9) 0 1.5px, rgba(220,195,255,0.12) 4px, transparent 13px);

    background-size: 100% 100%;
    background-repeat: no-repeat;
}

body::after {
    background:
        radial-gradient(
            circle at 23% 42%,
            rgba(190, 225, 255, 0.22) 0,
            rgba(190, 225, 255, 0.08) 3px,
            transparent 12px
        ),
        radial-gradient(
            circle at 81% 18%,
            rgba(220, 195, 255, 0.2) 0,
            rgba(220, 195, 255, 0.07) 3px,
            transparent 13px
        ),
        linear-gradient(
            115deg,
            transparent 0%,
            rgba(169, 232, 255, 0.025) 35%,
            transparent 55%
        );
}


/* ========================================
   Header
======================================== */

.site-logo {
    display: block;
    width: 150px;
    margin: 0;

    filter:
        drop-shadow(0 0 3px rgba(255, 255, 255, 0.95))
        drop-shadow(0 0 10px rgba(169, 232, 255, 0.8))
        drop-shadow(0 0 24px rgba(169, 232, 255, 0.5))
        drop-shadow(0 0 45px rgba(169, 232, 255, 0.25));
}

.site-logo img {
    display: block;
    width: 100%;
    height: auto;
}

.site-header {
    width: min(var(--content-width), calc(100% - 40px));
    margin: 0 auto;
    padding: 24px 0;
}

/* ========================================
   Main
======================================== */

main {
    width: min(var(--content-width), calc(100% - 40px));
    margin: 0 auto;
}


/* ========================================
   Page Title
======================================== */

.page-title {
    position: relative;

    padding: 45px 20px 55px;

    text-align: center;
}

.eyebrow {
    margin: 0 0 12px;

    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;

    opacity: 0.9;
}

.page-title h1 {
    margin: 0;

    font-family: "Shippori Mincho", serif;
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 600;
    letter-spacing: 0.12em;

    text-shadow:
        0 0 18px rgba(169, 232, 255, 0.35),
        0 0 45px rgba(169, 232, 255, 0.12);
}

.submission-period {
    margin: 24px auto 0;

    color: var(--accent);
    font-size: clamp(1.05rem, 2.5vw, 1.4rem);
    font-weight: 600;
    font-style: italic;
    letter-spacing: 0.08em;

    text-shadow:
        0 0 12px rgba(169, 232, 255, 0.25);
}

.title-description {
    max-width: 620px;
    margin: 22px auto 0;

    color: var(--text-secondary);
    font-size: 0.95rem;
}


/* ========================================
   Page Navigation
======================================== */

.page-nav {
    display: flex;
    justify-content: center;
    gap: 12px;

    margin: 0 auto 20px;
}

.page-nav a {
    display: flex;
    align-items: center;
    justify-content: center;

    min-width: 180px;
    padding: 14px 24px;

    color: var(--text-main);
    background: rgba(255, 255, 255, 0.035);

    border: 1px solid var(--border);
    border-radius: 999px;

    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;

    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        transform 0.25s ease,
        box-shadow 0.25s ease;
}

.page-nav a:hover {
    background: var(--accent-soft);
    border-color: var(--border-strong);

    transform: translateY(-2px);

    box-shadow:
        0 0 22px rgba(169, 232, 255, 0.1);
}


/* ========================================
   Application Button
======================================== */

.application-button-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;

    margin: 0 auto 110px;
}

.application-note {
    margin: 12px 0 0;

    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.6;
    text-align: center;
}
.application-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;

    width: min(530px, 100%);
    padding: 20px 26px;

    color: #071020;

    background:
        linear-gradient(
            110deg,
            var(--accent),
            var(--accent-strong)
        );

    border-radius: var(--radius-medium);

    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.05em;

    box-shadow:
        0 0 30px rgba(169, 232, 255, 0.14);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease;
}

.application-button:hover {
    transform: translateY(-3px);

    box-shadow:
        0 0 38px rgba(169, 232, 255, 0.28);
}

.arrow {
    font-size: 1.3rem;
}

/* ========================================
   Content Sections
======================================== */

.content-section {
    margin-bottom: 110px;
}

.section-heading {
    display: flex;
    align-items: baseline;
    gap: 18px;

    margin-bottom: 30px;

    border-bottom: 1px solid var(--border);

    padding-bottom: 14px;
}

.section-number {
    color: var(--accent);

    font-family:
        "Trebuchet MS",
        "Segoe UI",
        sans-serif;

    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.section-heading h2 {
    margin: 0;

    font-size: clamp(1.6rem, 4vw, 2.2rem);
    letter-spacing: 0.06em;
}

/* ========================================
   Introduction
======================================== */

.game-introduction-text {
    margin-bottom: 28px;

    color: var(--text-secondary);
    font-size: 0.95rem;
}

.game-introduction-text p {
    margin: 0 0 12px;
}

.game-introduction-text p:last-child {
    margin-bottom: 0;
}

.game-video {
    position: relative;

    width: 100%;
    aspect-ratio: 16 / 9;

    background:
        linear-gradient(
            145deg,
            rgba(31, 42, 92, 0.65),
            rgba(14, 19, 50, 0.8)
        );

    border: 1px solid var(--border);
    border-radius: var(--radius-medium);

    overflow: hidden;

    box-shadow:
        0 0 30px rgba(169, 232, 255, 0.06);
}

.video-coming-soon {
    position: absolute;
    inset: 0;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    text-align: center;
}

.video-coming-soon span {
    color: var(--accent);

    font-family:
        "Trebuchet MS",
        "Segoe UI",
        sans-serif;

    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 700;
    letter-spacing: 0.18em;

    text-shadow:
        0 0 12px rgba(169, 232, 255, 0.45),
        0 0 30px rgba(169, 232, 255, 0.2);
}

.video-coming-soon p {
    margin: 12px 0 0;

    color: var(--text-secondary);
    font-size: 0.85rem;
}

.game-video video {
    display: block;

    width: 100%;
    height: 100%;

    object-fit: contain;

    background: #000;
}

/* ========================================
   Department Cards
======================================== */

.department-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.department-card {
    position: relative;

    padding: 30px;

    background:
        linear-gradient(
            145deg,
            rgba(31, 42, 92, 0.65),
            rgba(14, 19, 50, 0.75)
        );

    border: 1px solid var(--border);
    border-radius: var(--radius-medium);

    overflow: hidden;
}

.department-card::before {
    content: "";

    position: absolute;
    top: -80px;
    right: -60px;

    width: 180px;
    height: 180px;

    background: rgba(169, 232, 255, 0.08);

    border-radius: 50%;

    filter: blur(20px);
}

.department-card-header {
    position: relative;
}

.department-label {
    color: var(--accent);

    font-family:
        "Trebuchet MS",
        "Segoe UI",
        sans-serif;

    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.18em;
}

.department-card h3 {
    margin: 4px 0 20px;

    font-size: 1.45rem;
}

.department-card p {
    position: relative;

    margin: 0;

    color: var(--text-secondary);
    font-size: 0.92rem;
}


/* ========================================
   Guidelines
======================================== */

.guideline-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.guideline-item {
    background: rgba(255, 255, 255, 0.025);

    border: 1px solid var(--border);
    border-radius: var(--radius-small);

    overflow: hidden;
}

.guideline-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 20px 24px;

    cursor: pointer;

    list-style: none;

    font-size: 1rem;
    font-weight: 700;

    transition:
        background 0.25s ease;
}

.guideline-item summary::-webkit-details-marker {
    display: none;
}

.guideline-item summary:hover {
    background: rgba(169, 232, 255, 0.05);
}

.details-icon {
    color: var(--accent);

    font-size: 1.4rem;
    font-weight: 300;
    line-height: 1;

    transition: opacity 0.25s ease;
}

.guideline-item[open] .details-icon {
    font-size: 0;
}

.guideline-item[open] .details-icon::after {
    content: "−";
    font-size: 1.4rem;
}

.guideline-content {
    display: grid;
    grid-template-rows: 0fr;

    padding: 0 24px;

    color: var(--text-secondary);
    font-size: 0.92rem;

    opacity: 0;

    transition:
        grid-template-rows 0.35s ease,
        opacity 0.25s ease,
        padding 0.35s ease;
}

.guideline-content > * {
    min-height: 0;
}

.guideline-item[open] .guideline-content {
    grid-template-rows: 1fr;

    padding: 0 24px 26px;

    opacity: 1;
}

.guideline-content h4 {
    margin: 24px 0 8px;

    color: var(--text-main);
    font-size: 0.95rem;
}

.guideline-content p {
    margin: 0 0 10px;
}

/* ========================================
   Contact
======================================== */

.contact-content {
    width: 100%;
    margin: 0;
    text-align: left;
}

.contact-address {
    margin-top: 24px;

    color: var(--accent);
    font-size: 1.1rem;
    letter-spacing: 0.04em;

    text-shadow:
        0 0 10px rgba(169, 232, 255, 0.3);
}

/* ========================================
   Final Application
======================================== */

.final-application {
    display: flex;
    flex-direction: column;
    align-items: center;

    margin: 0 0 100px;

    text-align: center;
}

.final-application p {
    margin: 0 0 24px;

    color: var(--text-secondary);
    font-size: 0.9rem;
}


/* ========================================
   Footer
======================================== */

.site-footer {
    padding: 40px 20px 70px;

    color: var(--text-muted);

    text-align: center;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
}


/* ========================================
   Back to Top
======================================== */

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;

    display: flex;
    align-items: center;
    justify-content: center;

    width: 48px;
    height: 48px;

    color: var(--text-main);
    background: rgba(12, 18, 48, 0.88);

    border: 1px solid var(--border);
    border-radius: 50%;

    text-decoration: none;
    font-size: 1.2rem;

    backdrop-filter: blur(10px);

    box-shadow:
        0 5px 25px rgba(0, 0, 0, 0.25);

    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        transform 0.25s ease;
}

.back-to-top:hover {
    background: var(--accent-soft);
    border-color: var(--border-strong);

    transform: translateY(-3px);
}


/* ========================================
   Responsive
======================================== */

@media (max-width: 700px) {

    .site-header {
        width: min(var(--content-width), calc(100% - 28px));
        padding: 20px 0;
    }

    main {
        width: min(var(--content-width), calc(100% - 28px));
    }

    .page-title {
        padding: 60px 10px 45px;
    }

    .page-title h1 {
        font-size: clamp(2.2rem, 13vw, 3.4rem);
    }

    .title-description {
        font-size: 0.88rem;
    }

    .page-nav {
        flex-direction: row;
        gap: 8px;
    }

    .page-nav a {
        flex: 1;
        min-width: 0;
        padding: 14px 10px;
    }

    .application-button-wrapper {
        margin-bottom: 75px;
    }

    .application-button {
        padding: 18px 20px;
        border-radius: 16px;
    }

    .content-section {
        margin-bottom: 75px;
    }

    .section-heading {
        gap: 12px;
    }

    .department-list {
        grid-template-columns: 1fr;
    }

    .department-card {
        padding: 24px;
    }

    .guideline-item summary {
        padding: 18px;
    }

    .guideline-content {
        padding: 0 18px 22px;
    }

    .final-application {
        margin-bottom: 70px;
    }

    .back-to-top {
        right: 16px;
        bottom: 16px;

        width: 44px;
        height: 44px;
    }
}


/* ========================================
   Reduced Motion
======================================== */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   Cancel Form
======================================== */

.withdrawal-form {
    display: flex;
    justify-content: flex-start;
    margin: 28px 0 80px;
}

.withdrawal-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;

    padding: 10px 18px;

    color: var(--text-secondary);
    font-size: 0.82rem;
    text-decoration: none;

    background: rgba(20, 27, 65, 0.45);
    border: 1px solid var(--border);
    border-radius: 10px;

    transition:
        color 0.25s ease,
        border-color 0.25s ease,
        background 0.25s ease;
}

.withdrawal-button:hover {
    color: var(--accent);
    background: var(--accent-soft);
    border-color: var(--border-strong);
}

.withdrawal-button span {
    font-size: 0.9rem;
}

@media (prefers-reduced-motion: reduce) {
    .withdrawal-button {
        transition: none;
    }
}

/* ========================================
   notice
======================================== */

.notice-block {
    margin-bottom: 32px;
    text-align: left;
}

.notice-text {
    margin: 0 0 12px;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.notice-image {
    display: block;
    width: 60%;
    max-width: 480px;
    height: auto;
    margin: 0 0 32px;
}

.notice-image-button {
    display: block;
    width: 70%;
    max-width: 480px;
    margin: 0 0 32px;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: zoom-in;
    text-align: left;
}

.notice-image-button:hover .notice-image {
    opacity: 0.85;
}

.image-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 56px 20px 24px;
    background: rgba(3, 5, 18, 0.92);
    cursor: zoom-out;
}

.image-modal.is-open {
    display: flex;
}

.image-modal-content {
    display: block;
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
}

.image-modal-close {
    position: absolute;
    top: 12px;
    right: 18px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-main);
    font-size: 30px;
    line-height: 1;
    cursor: pointer;
}

@media (max-width: 700px) {
    .notice-image-button {
        width: 90%;
    }
}