/* TechnoPlus activation & warranty registration
   One distinctive element: the machine fields sit on a "serial plate"
   (brushed-steel panel with corner rivets). Everything else stays quiet. */

:root {
    --bg: #F6F7F8;
    --surface: #FFFFFF;
    --ink: #16212C;
    --muted: #5A6673;
    --line: #DDE2E7;
    --line-strong: #B9C2CB;
    --action: #1D4B8F;          /* TechnoPlus blue */
    --action-hover: #173D75;
    --action-ink: #FFFFFF;
    --ok: #1C7A4B;
    --problem: #B3261E;
    --plate-top: #F3F5F7;
    --plate-bottom: #E3E8ED;
    --plate-edge: #C6CED6;
    --rivet: #A7B1BB;
    --radius: 6px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #10171E;
        --surface: #17202A;
        --ink: #E6EBF0;
        --muted: #9AA6B2;
        --line: #2A3643;
        --line-strong: #3D4B59;
        --action: #6A9BDD;
        --action-hover: #8AB2E6;
        --action-ink: #0C1520;
        --ok: #5CC08A;
        --problem: #F08A80;
        --plate-top: #1E2934;
        --plate-bottom: #18212B;
        --plate-edge: #34424F;
        --rivet: #4C5B6A;
    }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "IBM Plex Sans", "Noto Sans Sinhala", "Iskoola Pota", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.55;
}

/* ---------- Top bar ---------- */
.topbar {
    max-width: 40rem;
    margin: 0 auto;
    padding: 1.25rem 1.25rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.wordmark {
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink);
}
.wordmark span { font-weight: 400; color: var(--muted); }

.lang-switch {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--ink);
    text-decoration: none;
    padding: 0.3rem 0.75rem;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
}
.lang-switch:hover { border-color: var(--action); color: var(--action); }

/* ---------- Page ---------- */
.page {
    max-width: 40rem;
    margin: 0 auto;
    padding: 2.75rem 1.25rem 2.5rem;
}

h1 {
    margin: 0 0 0.75rem;
    font-size: clamp(1.9rem, 5.5vw, 2.5rem);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.015em;
}

.lede {
    margin: 0 0 1.75rem;
    max-width: 34rem;
    color: var(--muted);
}

/* The process really is a sequence, so it's numbered. */
.steps {
    list-style: none;
    margin: 0 0 2.5rem;
    padding: 0;
    display: grid;
    gap: 0.6rem;
}
@media (min-width: 34rem) {
    .steps { grid-template-columns: repeat(3, 1fr); gap: 1rem; }
}
.steps li {
    padding-top: 0.6rem;
    border-top: 2px solid var(--line);
    font-size: 0.92rem;
    color: var(--ink);
}
.step-n {
    display: inline-block;
    min-width: 1.4rem;
    font-weight: 600;
    color: var(--action);
}

/* ---------- Form groups ---------- */
.group {
    border: 0;
    margin: 0 0 2.25rem;
    padding: 0;
    min-width: 0;
}

.group-title {
    padding: 0;
    margin-bottom: 0.9rem;
    font-size: 1.1rem;
    font-weight: 600;
}

/* The serial plate */
.plate {
    padding: 1.5rem 1.4rem 0.4rem;
    border: 1px solid var(--plate-edge);
    border-radius: 10px;
    background:
        radial-gradient(circle at 12px 12px, var(--rivet) 2.5px, transparent 3.5px),
        radial-gradient(circle at calc(100% - 12px) 12px, var(--rivet) 2.5px, transparent 3.5px),
        radial-gradient(circle at 12px calc(100% - 12px), var(--rivet) 2.5px, transparent 3.5px),
        radial-gradient(circle at calc(100% - 12px) calc(100% - 12px), var(--rivet) 2.5px, transparent 3.5px),
        repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0 2px, rgba(0,0,0,0.012) 2px 4px),
        linear-gradient(180deg, var(--plate-top), var(--plate-bottom));
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.6);
}
.plate input { border-color: var(--plate-edge); }

.field { margin-bottom: 1.15rem; }

.field-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0 1rem;
}
@media (min-width: 34rem) {
    .field-row { grid-template-columns: 1fr 1fr; }
}

label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.95rem;
    font-weight: 500;
}

.optional {
    margin-left: 0.4rem;
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--muted);
}

input, textarea {
    width: 100%;
    padding: 0.7rem 0.8rem;
    font: inherit;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
}
textarea { resize: vertical; }
input:hover, textarea:hover { border-color: var(--muted); }

input:focus-visible, textarea:focus-visible,
button:focus-visible, a:focus-visible {
    outline: 2px solid var(--action);
    outline-offset: 2px;
    border-color: var(--action);
}

input[aria-invalid="true"], textarea[aria-invalid="true"] {
    border: 2px solid var(--problem);
}

.mono { font-family: "IBM Plex Mono", ui-monospace, Consolas, monospace; font-weight: 500; }
.code-input { font-size: 1.6rem; letter-spacing: 0.22em; padding: 0.7rem 0.9rem; }
.serial-input { letter-spacing: 0.06em; text-transform: uppercase; }

.hint  { margin: 0.35rem 0 0; font-size: 0.9rem; color: var(--muted); }
.error { margin: 0.35rem 0 0; font-size: 0.92rem; font-weight: 500; color: var(--problem); }

.warranty-note {
    margin: 0 0 1.35rem;
    padding: 0.85rem 1rem;
    font-size: 0.93rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 3px solid var(--action);
    border-radius: var(--radius);
}

.turnstile { min-height: 70px; }

/* ---------- Buttons ---------- */
.submit {
    width: 100%;
    padding: 0.9rem 1rem;
    font: inherit;
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--action-ink);
    background: var(--action);
    border: 0;
    border-radius: var(--radius);
    cursor: pointer;
}
.submit:hover { background: var(--action-hover); }
.submit:disabled { opacity: 0.6; cursor: progress; }

.btn-secondary {
    color: var(--action);
    background: transparent;
    border: 1px solid var(--action);
}
.btn-secondary:hover { color: var(--action-ink); background: var(--action); }

.privacy { margin: 1rem 0 0; font-size: 0.88rem; color: var(--muted); }

/* ---------- Results ---------- */
.result {
    margin: 0 0 1.75rem;
    padding: 1.25rem 1.35rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 4px solid var(--line);
    border-radius: 8px;
}
.result p { margin: 0 0 0.6rem; }
.result p:last-child { margin-bottom: 0; }
.result-ok      { border-left-color: var(--ok); }
.result-problem { border-left-color: var(--problem); }
.result-title   { font-size: 1.6rem; margin-bottom: 0.6rem; }
.resend { margin: 1.1rem 0; }
.resend .hint { margin: 0 0 0.5rem; }

a { color: var(--action); font-weight: 500; }

/* ---------- Footer ---------- */
.site-footer {
    max-width: 40rem;
    margin: 0 auto;
    padding: 1.25rem 1.25rem 2.5rem;
    border-top: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem 1.5rem;
    font-size: 0.9rem;
    color: var(--muted);
}

/* Sinhala script needs more line height */
html[lang="si"] body { line-height: 1.75; }
html[lang="si"] h1 { line-height: 1.35; letter-spacing: 0; }

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}

/* ---------- Address, district, consent, warranty ---------- */
.sub-title {
    margin: 1.75rem 0 0.9rem;
    font-size: 1rem;
    font-weight: 600;
}

select {
    width: 100%;
    padding: 0.7rem 2.4rem 0.7rem 0.8rem;
    font: inherit;
    color: var(--ink);
    background-color: var(--surface);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235A6673' stroke-width='1.6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.9rem center;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    appearance: none;
    -webkit-appearance: none;
}
select:hover { border-color: var(--muted); }
select:focus-visible { outline: 2px solid var(--action); outline-offset: 2px; border-color: var(--action); }
select[aria-invalid="true"] { border: 2px solid var(--problem); }

.check {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    font-weight: 400;
    font-size: 0.95rem;
    cursor: pointer;
}
.check input[type="checkbox"] {
    flex: 0 0 auto;
    width: 1.25rem;
    height: 1.25rem;
    margin: 0.15rem 0 0;
    padding: 0;
    accent-color: var(--action);
}
.consent { margin: 0.5rem 0 1.5rem; }

.warranty-until {
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--ok) 10%, transparent);
}

/* Privacy page */
.prose h2 { margin: 1.75rem 0 0.4rem; font-size: 1.1rem; font-weight: 600; }
.prose p  { margin: 0 0 0.9rem; max-width: 36rem; }