* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg: #f1f5f9; --card: #ffffff; --card-border: #e2e8f0; --card-hover: #cbd5e1;
    --text: #1e293b; --text-sub: #64748b; --text-muted: #94a3b8;
    --row-border: rgba(148,163,184,0.3);
    --badge-v4-bg: rgba(37,99,235,0.1); --badge-v4-text: #2563eb;
    --badge-v6-bg: rgba(5,150,105,0.1); --badge-v6-text: #059669;
    --v4: #2563eb; --v6: #059669;
    --gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --header-border: #e2e8f0; --unavail: #94a3b8;
    --note-bg: rgba(37,99,235,0.06); --note-border: rgba(37,99,235,0.15); --note-text: #64748b;
    --shadow: 0 4px 20px rgba(0,0,0,0.06);
    --tag-bg: rgba(234,179,8,0.12); --tag-text: #b45309;
    --detect-bg: rgba(234,179,8,0.08); --detect-border: rgba(234,179,8,0.2); --detect-text: #92400e;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a; --card: #1e293b; --card-border: #334155; --card-hover: #475569;
        --text: #e2e8f0; --text-sub: #64748b; --text-muted: #94a3b8;
        --row-border: rgba(51,65,85,0.5);
        --badge-v4-bg: rgba(37,99,235,0.25); --badge-v4-text: #93c5fd;
        --badge-v6-bg: rgba(5,150,105,0.25); --badge-v6-text: #6ee7b7;
        --v4: #93c5fd; --v6: #6ee7b7;
        --gradient: linear-gradient(135deg, #60a5fa, #a78bfa);
        --header-border: #334155; --unavail: #475569;
        --note-bg: rgba(148,163,184,0.08); --note-border: rgba(148,163,184,0.15); --note-text: #94a3b8;
        --shadow: 0 4px 20px rgba(0,0,0,0.25);
        --tag-bg: rgba(234,179,8,0.15); --tag-text: #fbbf24;
        --detect-bg: rgba(234,179,8,0.1); --detect-border: rgba(234,179,8,0.25); --detect-text: #fbbf24;
    }
}
body {
    background: var(--bg); color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    min-height: 100vh; display: flex; flex-direction: column; align-items: center; padding: 2.5rem 1rem 3rem;
}
h1 {
    font-size: 1.6rem; margin-bottom: 0.4rem;
    background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.subtitle { color: var(--text-sub); font-size: 0.85rem; margin-bottom: 2rem; }

#cards { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.25rem; max-width: 1000px; width: 100%; align-items: stretch; }
@media (max-width: 720px) { #cards { grid-template-columns: 1fr; max-width: 100%; } }

.card {
    background: var(--card); border-radius: 14px; padding: 1.5rem;
    border: 1px solid var(--card-border); box-shadow: var(--shadow); transition: border-color 0.3s;
    display: flex; flex-direction: column; height: 100%; overflow: hidden;
}
.card:hover { border-color: var(--card-hover); }
.card-header {
    display: flex; align-items: center; gap: 0.75rem;
    margin-bottom: 1.25rem; padding-bottom: 0.85rem; border-bottom: 1px solid var(--header-border);
}
.badge { padding: 0.2rem 0.65rem; border-radius: 999px; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; }
.badge-v4 { background: var(--badge-v4-bg); color: var(--badge-v4-text); }
.badge-v6 { background: var(--badge-v6-bg); color: var(--badge-v6-text); }
.tag {
    padding: 0.15rem 0.55rem; border-radius: 999px; font-size: 0.7rem; font-weight: 600;
    background: var(--tag-bg); color: var(--tag-text);
}
.card-header h2 { font-size: 1rem; font-weight: 600; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; margin-left: auto; flex-shrink: 0; }
.status-ok   { background: #22c55e; box-shadow: 0 0 6px rgba(34,197,94,0.6); }
.status-fail  { background: #ef4444; box-shadow: 0 0 6px rgba(239,68,68,0.6); }
.status-load  { background: #eab308; animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.2; } }

.info-row {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: 0.5rem 0; border-bottom: 1px solid var(--row-border); min-width: 0;
}
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--text-muted); font-size: 0.82rem; flex-shrink: 0; }
.info-value { font-weight: 600; font-size: 0.85rem; text-align: right; word-break: normal; overflow-wrap: break-word; margin-left: 1rem; flex: 1; min-width: 0; }
.v4-color { color: var(--v4); } .v6-color { color: var(--v6); }
.ip-value { font-size: 0.95rem; letter-spacing: 0.01em; }
.info-source { font-size: 0.7rem; color: var(--text-muted); font-weight: 400; margin-left: 0.3rem; }

.detecting {
    text-align: center; padding: 1.8rem 0.5rem;
    color: var(--detect-text); font-size: 0.85rem; line-height: 1.8;
    flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.detecting-icon {
    display: inline-block; width: 28px; height: 28px;
    border: 3px solid var(--detect-border); border-top-color: var(--tag-text);
    border-radius: 50%; animation: spin 0.8s linear infinite;
    margin-bottom: 0.6rem;
}
@keyframes spin { to { transform: rotate(360deg); } }
.detecting-text { font-weight: 500; }
.detecting-sub { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.2rem; }

.fail-msg {
    text-align: center; padding: 1.5rem 0.5rem;
    color: var(--unavail); font-size: 0.85rem; line-height: 1.6;
    flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.fail-reason { font-size: 0.78rem; margin-top: 0.3rem; }

.note {
    max-width: 1000px; width: 100%; margin-top: 1.5rem; padding: 0.85rem 1.1rem;
    border-radius: 10px; background: var(--note-bg); border: 1px solid var(--note-border);
    color: var(--note-text); font-size: 0.8rem; line-height: 1.7; display: none;
}
.note.show { display: block; }
.note strong { color: var(--text-sub); }

/* Footer */
.footer-box {
    max-width: 1000px; width: 100%; margin-top: 2rem;
    border-radius: 12px; overflow: hidden;
    position: relative; cursor: pointer; text-decoration: none;
    display: flex; align-items: center; gap: 0.9rem;
    padding: 0.8rem 1.2rem;
    background: var(--card); border: 1px solid var(--card-border);
    box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s;
}
.footer-box:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,0.1); }
@media (prefers-color-scheme: dark) { .footer-box:hover { box-shadow: 0 8px 28px rgba(0,0,0,0.4); } }
.footer-bg {
    position: absolute; inset: 0; z-index: 0;
    background: url('/D3E2C704-15B3-8677-036D-B88F6E1CB3F8.jpg') center/cover no-repeat;
    opacity: 0.35;
}
@media (prefers-color-scheme: dark) { .footer-bg { opacity: 0.2; } }
.footer-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    object-fit: cover; flex-shrink: 0;
    border: 2px solid var(--card-border);
    position: relative; z-index: 1;
}
.footer-text {
    font-size: 0.82rem; color: var(--text-sub);
    position: relative; z-index: 1;
}

.skeleton { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.25rem; max-width: 1000px; width: 100%; }
@media (max-width: 720px) { .skeleton { grid-template-columns: 1fr; } }
.sk-card { background: var(--card); border-radius: 14px; padding: 1.5rem; border: 1px solid var(--card-border); box-shadow: var(--shadow); }
.sk-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1.25rem; padding-bottom: 0.85rem; border-bottom: 1px solid var(--header-border); }
.sk-line { height: 14px; border-radius: 4px; background: var(--row-border); margin-bottom: 0.65rem; animation: shimmer 1.5s ease-in-out infinite; }
.sk-line:last-child { margin-bottom: 0; }
.sk-line:nth-child(1) { width: 60%; } .sk-line:nth-child(2) { width: 45%; }
.sk-line:nth-child(3) { width: 55%; } .sk-line:nth-child(4) { width: 40%; }
@keyframes shimmer { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }