:root {
  --bg: #f4f7f8;
  --surface: #ffffff;
  --ink: #0f1f24;
  --muted: #5d6e74;
  --line: #dbe4e7;
  --primary: #0f766e;
  --primary-ink: #ffffff;
  --primary-hover: #0b5f58;
  --vpn: #4338ca;
  --vpn-hover: #3730a3;
  --vpn-soft: #eef0ff;
  --ok: #15803d;
  --ok-soft: #ecfdf3;
  --warn: #b45309;
  --warn-soft: #fff7e8;
  --error: #b42318;
  --error-soft: #fef3f2;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 31, 36, 0.05), 0 6px 20px rgba(15, 31, 36, 0.05);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); line-height: 1.5; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--primary); }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 0 0 0.5rem; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 0; }

.topbar { background: var(--surface); border-bottom: 1px solid var(--line); padding: 0 16px; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; max-width: 1040px; margin: 0 auto; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); text-decoration: none; }
.settings-link { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; color: var(--muted); }
.settings-link:hover { background: var(--bg); color: var(--ink); }
.settings-link svg { width: 20px; height: 20px; fill: currentColor; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; background: var(--primary); display: grid; place-items: center; }
.brand-mark svg { width: 18px; height: 18px; fill: #fff; }

.container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 28px 16px 40px; flex: 1; }
.footer { text-align: center; color: var(--muted); font-size: 0.8rem; padding: 18px 16px; }

.grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.span-2 { grid-column: 1 / -1; }
@media (max-width: 760px) { .grid { grid-template-columns: minmax(0, 1fr); } }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; }
.hero { padding: 32px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.72rem; font-weight: 700; color: var(--primary); margin: 0 0 6px; }
.lead { color: var(--muted); margin: 0 0 22px; }
.intro { margin-bottom: 22px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 10px; padding: 11px 20px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn-block { width: 100%; }
.btn-primary { background: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--bg); }
.btn-vpn { background: var(--vpn); color: #fff; }
.btn-vpn:hover { background: var(--vpn-hover); }
.btn-vpn svg { width: 16px; height: 16px; fill: currentColor; }
.btn:focus-visible, select:focus-visible { outline: 3px solid rgba(67, 56, 202, 0.35); outline-offset: 2px; }

.steps { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 10px; color: var(--muted); font-size: 0.92rem; }
.steps li { display: flex; align-items: center; gap: 10px; }
.steps span { width: 24px; height: 24px; border-radius: 50%; background: var(--bg); border: 1px solid var(--line); display: grid; place-items: center; font-size: 0.78rem; font-weight: 700; color: var(--ink); flex: none; }

.pill { font-size: 0.75rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.pill-off { background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.pill-on { background: var(--vpn); color: #fff; }
.vpn-card.vpn-on { border-color: #c7cbff; background: linear-gradient(180deg, var(--vpn-soft), var(--surface) 70%); }

.netinfo, .details { margin: 0 0 18px; display: grid; gap: 12px; }
.netinfo div, .details div { display: grid; gap: 2px; }
.details div { grid-template-columns: 140px minmax(0, 1fr); align-items: baseline; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
@media (max-width: 520px) { .details div { grid-template-columns: minmax(0, 1fr); gap: 2px; } }
dt { color: var(--muted); font-size: 0.82rem; }
dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.05rem; }
.flag { font-size: 1.1rem; }
.muted { color: var(--muted); font-weight: 400; }
.hint { color: var(--muted); font-size: 0.82rem; margin: 12px 0 0; }

.vpn-form { display: grid; gap: 10px; }
.vpn-form label { font-size: 0.82rem; color: var(--muted); }
select { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); width: 100%; }

.result { border-radius: 12px; padding: 14px 16px; margin: 16px 0 20px; display: grid; gap: 2px; }
.result span { color: var(--muted); font-size: 0.92rem; }
.result-ok { background: var(--ok-soft); border: 1px solid #b7ebc8; }
.result-ok strong { color: var(--ok); }
.result-stepup { background: var(--warn-soft); border: 1px solid #f6d79b; }
.result-stepup strong { color: var(--warn); }

.chip { display: inline-block; font-size: 0.8rem; font-weight: 600; padding: 2px 10px; border-radius: 999px; background: var(--bg); border: 1px solid var(--line); margin: 0 6px 4px 0; }
.chip-warn { background: var(--warn-soft); border-color: #f6d79b; color: var(--warn); }

.notice { background: var(--vpn-soft); border: 1px solid #c7cbff; color: #312e81; border-radius: 10px; padding: 10px 14px; font-size: 0.9rem; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.actions form { margin: 0; }

.flash { border-radius: 10px; padding: 12px 16px; margin: 0 0 18px; font-size: 0.92rem; }
.flash-info { background: var(--vpn-soft); border: 1px solid #c7cbff; color: #312e81; }
.flash-error { background: var(--error-soft); border: 1px solid #fecdca; color: var(--error); }

.table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.table th { text-align: left; color: var(--muted); font-weight: 600; font-size: 0.8rem; padding: 8px 6px; border-bottom: 1px solid var(--line); }
.table td { padding: 10px 6px; border-bottom: 1px solid var(--line); }
.table .num { text-align: right; }

.app-card { text-decoration: none; color: inherit; display: grid; gap: 8px; }
.app-card:hover { border-color: var(--primary); }
.app-card p { color: var(--muted); margin: 0; }
.link { color: var(--primary); font-weight: 600; font-size: 0.9rem; }

/* Sign-in (app-native) */
.signin-card { max-width: 440px; margin: 0 auto; padding: 32px; }
.signin-form { display: grid; gap: 8px; margin-top: 4px; }
.signin-form label { font-size: 0.82rem; color: var(--muted); margin-top: 6px; }
.signin-form input { font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); width: 100%; }
.signin-form input:focus-visible { outline: 3px solid rgba(15, 118, 110, 0.3); outline-offset: 1px; border-color: var(--primary); }
.signin-form .btn { margin-top: 12px; }
.hero .signin-form { max-width: 360px; }
.otp-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.4rem !important; letter-spacing: 0.4em; text-align: center; }
.inline-form { margin: 0; display: inline; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--primary); font-weight: 600; cursor: pointer; }
.link-btn:hover { text-decoration: underline; }
.signin-card .inline-form .link-btn { margin-top: 14px; }
.signin-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--muted); }
.or { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 0.8rem; margin: 16px 0 8px; }
.or::before, .or::after { content: ""; flex: 1; border-top: 1px solid var(--line); }

/* Settings */
.settings { max-width: 760px; margin: 0 auto; display: grid; gap: 20px; }
.settings-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; }
.settings-head form { margin: 0; }
.settings-form { display: grid; gap: 20px; }
.settings-form .card h2 { margin-bottom: 14px; }
.settings-form .card-head h2 { margin-bottom: 0; }
.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field label { font-size: 0.85rem; font-weight: 600; }
.field input[type=text], .field input[type=url], .field input[type=password] { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); width: 100%; }
.field input:focus-visible { outline: 3px solid rgba(15, 118, 110, 0.3); outline-offset: 1px; border-color: var(--primary); }
.field .hint { margin: 0; }
.req { color: var(--error); }
.settings-actions { display: flex; gap: 10px; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; border-radius: 8px; }
.danger h2 { margin-bottom: 6px; }
.danger form { margin-top: 12px; }