:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --ink: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --green: #16a34a;
    --red: #dc2626;
    --amber: #d97706;
    --radius: 12px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
    background: var(--bg);
    color: var(--ink);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.page { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
    display: flex; align-items: center; gap: 2rem;
    padding: 0 2rem; height: 60px;
    background: #fff; border-bottom: 1px solid var(--border);
}
.brand { font-size: 1.25rem; font-weight: 700; color: var(--ink); }
.brand span { color: var(--primary); }
.topnav { display: flex; gap: 1.25rem; }
.topnav a { color: var(--muted); font-weight: 500; }
.topnav a:hover { color: var(--ink); text-decoration: none; }

.content { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 2rem; }
.footer { text-align: center; color: var(--muted); padding: 1.5rem; font-size: .85rem; }

h1 { font-size: 1.6rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 1.5rem 0 .75rem; }

.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.25rem;
}

.btn {
    display: inline-flex; align-items: center; gap: .5rem;
    background: var(--primary); color: #fff; border: 0;
    padding: .6rem 1.1rem; border-radius: 8px; font-size: .95rem;
    cursor: pointer; font-weight: 600;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.secondary { background: #eef2ff; color: var(--primary-dark); }
.btn.danger { background: #fef2f2; color: var(--red); }
.btn.ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }

label { display: block; font-weight: 600; font-size: .9rem; margin: .75rem 0 .3rem; }
input, select, textarea {
    width: 100%; padding: .55rem .7rem; border: 1px solid var(--border);
    border-radius: 8px; font-size: .95rem; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid #bfdbfe; border-color: var(--primary); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .65rem .5rem; border-bottom: 1px solid var(--border); font-size: .9rem; }
th { color: var(--muted); font-weight: 600; }

.badge { display: inline-block; padding: .2rem .6rem; border-radius: 999px; font-size: .75rem; font-weight: 600; }
.badge.draft { background: #f3f4f6; color: #4b5563; }
.badge.sent { background: #eff6ff; color: var(--primary-dark); }
.badge.completed { background: #ecfdf5; color: var(--green); }
.badge.declined, .badge.cancelled { background: #fef2f2; color: var(--red); }
.badge.pending { background: #fffbeb; color: var(--amber); }
.badge.viewed { background: #eff6ff; color: var(--primary-dark); }
.badge.signed { background: #ecfdf5; color: var(--green); }

.muted { color: var(--muted); }
.row { display: flex; gap: 1rem; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 180px; }
.alert { padding: .8rem 1rem; border-radius: 8px; margin: 1rem 0; font-size: .9rem; }
.alert.error { background: #fef2f2; color: var(--red); }
.alert.success { background: #ecfdf5; color: var(--green); }
.alert.info { background: #eff6ff; color: var(--primary-dark); }
.signer-row { border: 1px solid var(--border); border-radius: 8px; padding: 1rem; margin-bottom: .75rem; }
.otp-input { font-size: 1.5rem; letter-spacing: .4rem; text-align: center; }
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { padding: .6rem 0; border-bottom: 1px dashed var(--border); font-size: .88rem; }
.timeline .t { color: var(--muted); font-size: .8rem; }
.center { max-width: 620px; margin: 2rem auto; }
.hash { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .8rem; word-break: break-all; color: var(--muted); }