:root {
    --bg: #eef2f7;
    --card: #ffffff;
    --ink: #0f172a;
    --muted: #64748b;
    --line: #e2e8f0;
    --brand: #4f46e5;
    --brand-2: #7c3aed;
    --in: #16a34a;
    --in-soft: #dcfce7;
    --accent: #f97316;
    --danger: #e11d48;
    --shadow: 0 10px 30px -12px rgba(15, 23, 42, .25);
    --radius: 18px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(1200px 500px at 80% -10%, #ddd6fe55, transparent 60%),
        radial-gradient(900px 500px at -10% 0%, #c7d2fe55, transparent 55%),
        var(--bg);
    min-height: 100vh;
    line-height: 1.45;
}

.loading {
    text-align: center;
    color: var(--muted);
    padding: 80px 20px;
}

/* ---------- Layout ---------- */
.wrap {
    max-width: 620px;
    margin: 0 auto;
    padding: 0 16px calc(40px + env(safe-area-inset-bottom));
}

.topbar {
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    color: #fff;
    padding: calc(22px + env(safe-area-inset-top)) 0 26px;
    box-shadow: var(--shadow);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -.3px; }
.brand .ball { font-size: 24px; }
.topbar .who { font-size: 13px; opacity: .9; }

.linkbtn {
    background: rgba(255, 255, 255, .18);
    color: #fff;
    border: none;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}
.linkbtn:active { transform: scale(.97); }

/* ---------- Cards ---------- */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    margin-top: 16px;
}
.card h2 { margin: 0 0 4px; font-size: 17px; }
.card .sub { color: var(--muted); font-size: 13px; margin: 0 0 14px; }

.section-title {
    margin: 26px 4px 6px;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--muted);
}

/* ---------- Login ---------- */
.login {
    max-width: 380px;
    margin: 12vh auto 0;
    text-align: center;
    padding: 0 16px;
}
.login .ball { font-size: 56px; }
.login h1 { font-size: 24px; margin: 8px 0 2px; }
.login p { color: var(--muted); margin: 0 0 24px; }

input[type="password"], input[type="text"], input[type="date"], input[type="number"] {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--line);
    border-radius: 14px;
    font-size: 16px;
    background: #fff;
    color: var(--ink);
    transition: border-color .15s;
}
input:focus { outline: none; border-color: var(--brand); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 16px;
    border: none;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    color: #fff;
    margin-top: 12px;
    transition: transform .08s, opacity .15s;
}
.btn:active { transform: scale(.98); }
.btn[disabled] { opacity: .55; cursor: default; }
.btn.ghost { background: #fff; color: var(--brand); border: 1.5px solid var(--line); }
.btn.sm { width: auto; padding: 9px 14px; font-size: 14px; margin: 0; }
.btn.danger { background: #fff; color: var(--danger); border: 1.5px solid #fecdd3; }

.err {
    color: var(--danger);
    font-size: 14px;
    min-height: 20px;
    margin-top: 10px;
}

/* ---------- Name picker ---------- */
.names {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.name-chip {
    border: 1.5px solid var(--line);
    background: #fff;
    color: var(--ink);
    padding: 10px 14px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}
.name-chip:active { transform: scale(.97); }
.name-chip.active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ---------- Session card ---------- */
.session {
    border: 1.5px solid var(--line);
    border-radius: 16px;
    padding: 14px 16px;
    margin-top: 12px;
    transition: border-color .15s, background .15s;
}
.session.in { border-color: var(--in); background: linear-gradient(0deg, var(--in-soft), #fff 70%); }
.session.closed { opacity: .92; background: #f8fafc; }

.session .row1 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.session .date { font-weight: 800; font-size: 16px; }
.session .meta { color: var(--muted); font-size: 13px; margin-top: 2px; }

.toggle {
    border: 1.5px solid var(--brand);
    background: #fff;
    color: var(--brand);
    padding: 11px 18px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    white-space: nowrap;
    transition: transform .08s;
}
.toggle:active { transform: scale(.96); }
.toggle.in { background: var(--in); border-color: var(--in); color: #fff; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.chip {
    font-size: 12.5px;
    background: #eef2ff;
    color: #3730a3;
    padding: 4px 10px;
    border-radius: 999px;
    font-weight: 600;
}
.chip.me { background: var(--in); color: #fff; }
.chips .empty { color: var(--muted); font-size: 13px; }

.badge {
    display: inline-block;
    font-size: 11.5px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .4px;
    padding: 3px 9px;
    border-radius: 999px;
}
.badge.closed { background: #fee2e2; color: #b91c1c; }
.badge.open { background: #dcfce7; color: #15803d; }

.payline {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--line);
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.payline b { font-size: 17px; color: var(--ink); }
.payline .mine { color: var(--in); font-weight: 800; }

/* ---------- Admin ---------- */
.tabs {
    display: flex;
    gap: 6px;
    background: #e9edf5;
    padding: 5px;
    border-radius: 14px;
    margin-top: 18px;
}
.tab {
    flex: 1;
    text-align: center;
    padding: 10px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 14px;
    color: var(--muted);
    cursor: pointer;
    border: none;
    background: transparent;
}
.tab.active { background: #fff; color: var(--brand); box-shadow: 0 2px 6px rgba(0,0,0,.06); }

.inline-form { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.inline-form input { flex: 1; min-width: 120px; }

.admin-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 4px;
    border-bottom: 1px solid var(--line);
    gap: 10px;
}
.admin-row:last-child { border-bottom: none; }
.admin-row .x {
    border: none;
    background: #fff1f2;
    color: var(--danger);
    width: 32px; height: 32px;
    border-radius: 9px;
    font-size: 16px;
    cursor: pointer;
    flex: none;
}
.admin-row .info small { color: var(--muted); }

.hint { font-size: 12.5px; color: var(--muted); margin-top: 8px; }

.toast {
    position: fixed;
    left: 50%;
    bottom: calc(20px + env(safe-area-inset-bottom));
    transform: translateX(-50%) translateY(20px);
    background: #0f172a;
    color: #fff;
    padding: 11px 18px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s, transform .2s;
    z-index: 50;
    max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.bad { background: var(--danger); }