* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Malgun Gothic",
        sans-serif;
    line-height: 1.6;

    background: #111827;
    color: #f9fafb;
}

a {
    color: #93c5fd;
}

/* ---------- Layout ---------- */

.sidebar {
    position: sticky;
    top: 0;
    flex: 0 0 220px;
    height: 100vh;
    padding: 28px 16px;
    border-right: 1px solid #1f2937;
    background: #0b1220;
}

.site-title {
    display: block;
    margin: 0 12px 24px;
    color: #f9fafb;
    font-weight: 700;
    text-decoration: none;
}

.side-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.side-nav a {
    padding: 10px 12px;
    border-radius: 8px;
    color: #9ca3af;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.15s, color 0.15s;
}

.side-nav a:hover {
    background: #1f2937;
    color: #f9fafb;
}

.side-nav a.active {
    background: #1e3a8a;
    color: #f9fafb;
}

.main {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    padding-top: 28px;
}

.site-footer {
    width: min(1040px, 100%);
    margin: auto auto 0;
    padding: 20px 16px;
    text-align: center;
    font-size: 14px;
}

/* 좁은 화면에서는 사이드바를 위쪽 가로 메뉴로 바꾼다 */
@media (max-width: 760px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        flex: none;
        height: auto;
        padding: 14px 16px;
        border-right: none;
        border-bottom: 1px solid #1f2937;
    }

    .site-title {
        margin: 0 0 10px;
    }

    .side-nav {
        flex-direction: row;
    }

    .main {
        padding-top: 20px;
    }
}

.site-footer a {
    color: #6b7280;
    text-decoration: none;
}

.page {
    width: min(1040px, 100%);
    margin: 0 auto;
    padding: 0 16px 40px;
}

/* ---------- Banner ---------- */

.banner {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #0f172a;
}

.banner img {
    position: absolute;
    inset: 0;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 흰 배경 이미지(로고 등) — 잘리지 않게 전체를 보여주고 어두운 덮개를 뺀다 */
.banner.light {
    background: #ffffff;
}

.banner.light img {
    object-fit: contain;
}

.banner.light::after {
    display: none;
}

.banner.placeholder {
    display: flex;
    justify-content: center;
    align-items: center;

    background:
        radial-gradient(circle at 30% 30%, rgba(239, 68, 68, 0.35), transparent 60%),
        radial-gradient(circle at 75% 70%, rgba(234, 179, 8, 0.25), transparent 55%),
        #0f172a;
}

.banner.placeholder.sea {
    background:
        radial-gradient(circle at 25% 35%, rgba(56, 189, 248, 0.35), transparent 60%),
        radial-gradient(circle at 80% 75%, rgba(20, 184, 166, 0.28), transparent 55%),
        #0c1a2e;
}

.banner.placeholder span {
    padding: 0 20px;
    font-size: clamp(22px, 5vw, 40px);
    font-weight: 800;
    color: rgba(255, 255, 255, 0.16);
    letter-spacing: 3px;
    white-space: nowrap;
}

/* ---------- Home ---------- */

.intro {
    text-align: center;
    margin: 20px 0 36px;
}

.intro h1 {
    font-size: clamp(30px, 6vw, 44px);
    margin: 0 0 6px;
}

.intro p {
    margin: 0;
    color: #9ca3af;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    display: flex;
    flex-direction: column;
    overflow: hidden;

    border-radius: 16px;
    background: #1f2937;
    color: inherit;
    text-decoration: none;

    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    transition: transform 0.15s, box-shadow 0.15s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 40px rgba(59, 130, 246, 0.25);
}

.card .banner {
    aspect-ratio: 2 / 1;
}

.card .banner.placeholder span {
    font-size: clamp(20px, 3vw, 28px);
}

.card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 16px 20px 18px;
}

.card h2 {
    margin: 0 0 4px;
    font-size: 20px;
}

.card p {
    margin: 0 0 16px;
    color: #9ca3af;
    font-size: 14px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    font-size: 13px;
}

.badge {
    padding: 2px 10px;
    border-radius: 999px;
    background: #111827;
    color: #9ca3af;
}

.more {
    color: #93c5fd;
    font-weight: 600;
}

/* ---------- Project page ---------- */

.back {
    display: inline-block;
    margin-bottom: 16px;
    color: #9ca3af;
    text-decoration: none;
}

.back:hover {
    color: #f9fafb;
}

.project {
    width: min(760px, 100%);
    margin: 0 auto;
    text-align: center;
}

.hero {
    aspect-ratio: 21 / 9;
    border-radius: 18px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(17, 24, 39, 0) 55%,
        rgba(17, 24, 39, 0.85) 100%
    );
}

.project h1 {
    font-size: clamp(30px, 6vw, 42px);
    margin: 18px 0 4px;
}

.tagline {
    margin: 0 0 28px;
    color: #9ca3af;
}

.release-info {
    margin-top: 18px;
    color: #6b7280;
    font-size: 14px;
}

.release-info a {
    color: #9ca3af;
}

.error {
    color: #f87171;
}

.content {
    margin-top: 44px;
    padding-top: 12px;
    border-top: 1px solid #1f2937;
    text-align: left;
    color: #d1d5db;
}

.content.about {
    width: min(760px, 100%);
    margin: 0 auto;
}

.content h2 {
    margin-top: 32px;
    color: #f9fafb;
    font-size: 22px;
}

.content h3 {
    margin-top: 28px;
    color: #f9fafb;
    font-size: 17px;
}

/* 설명서 — 표가 많다. 좁은 화면에서는 표만 옆으로 민다 */
.content.guide table {
    display: block;
    overflow-x: auto;
    margin: 12px 0 20px;
    font-size: 15px;
}

.content.guide th {
    color: #9ca3af;
    font-weight: 600;
    white-space: nowrap;
}

.content img {
    max-width: 100%;
    border-radius: 12px;
}

.content img.screenshot {
    display: block;
    width: min(340px, 100%);
    margin: 24px auto;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

.content code {
    padding: 1px 6px;
    border-radius: 4px;
    background: #1f2937;
    font-size: 0.92em;
}

.content table {
    width: 100%;
    border-collapse: collapse;
}

.content th,
.content td {
    padding: 8px 10px;
    border-bottom: 1px solid #1f2937;
    text-align: left;
}

/* ---------- Download buttons ---------- */

.downloads {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.download-row {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 14px;
    width: 100%;
}

.download-row .download.secondary {
    justify-content: center;
    padding: 12px 22px;
}

@media (max-width: 560px) {
    .download-row {
        flex-direction: column;
        align-items: center;
    }
}

.download {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;

    text-decoration: none;
    font-weight: 600;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.download .sub {
    font-size: 13px;
    font-weight: 400;
    opacity: 0.8;
}

.download.primary {
    width: min(400px, 100%);
    padding: 20px 32px;
    border-radius: 14px;

    background: linear-gradient(135deg, #3b82f6, #2563eb 50%, #7c3aed);
    color: white;
    font-size: 22px;

    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.08) inset,
        0 10px 30px rgba(59, 130, 246, 0.45);
    animation: glow 2.4s ease-in-out infinite;
}

.download.primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.15) inset,
        0 16px 40px rgba(124, 58, 237, 0.55);
}

.download.secondary {
    padding: 12px 24px;
    border-radius: 10px;

    background: transparent;
    color: #d1d5db;
    border: 1px solid #374151;
    font-size: 16px;
}

.download.secondary:hover {
    background: #1f2937;
    color: #f9fafb;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 0 1px rgba(255,255,255,0.08) inset, 0 10px 30px rgba(59,130,246,0.40); }
    50%      { box-shadow: 0 0 0 1px rgba(255,255,255,0.08) inset, 0 10px 44px rgba(124,58,237,0.65); }
}

@media (prefers-reduced-motion: reduce) {
    .download.primary { animation: none; }
    .card, .download { transition: none; }
}