/* ==========================================================================
   COMMUNICATIONS TERMINAL — contact page (scoped .ct design system)
   External uplink / transmission interface. Local palette per brief;
   linked ONLY on contact.html.
   ========================================================================== */

.ct {
    --ct-bg: #05070D;
    --ct-surface: #0A0F18;
    --ct-surface-2: #0D141F;
    --ct-text: #E8EDF0;
    --ct-muted: #7C8794;
    --ct-faint: #4A5563;
    --ct-cyan: #06D6E5;
    --ct-cyan-dim: rgba(6, 214, 229, 0.35);
    --ct-hairline: rgba(232, 237, 240, 0.08);
    --ct-hairline-strong: rgba(232, 237, 240, 0.16);
    --ct-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Consolas', monospace;

    background: var(--ct-bg);
    color: var(--ct-text);
    font-family: 'Numans', sans-serif;
    position: relative;
    overflow: clip;
}

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

/* ---- shared atoms -------------------------------------------------- */

.ct-label {
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ct-muted);
}

.ct-num {
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--ct-cyan);
}

/* 01 — HERO ---------------------------------------------------------- */

.ct-hero {
    position: relative;
    padding: calc(84px + 48px) clamp(24px, 6vw, 96px) 44px;
    display: flex;
    flex-direction: column;
    gap: 26px;
    border-bottom: 1px solid var(--ct-hairline);
}

.ct-hero-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.ct-hero-kicker {
    font-family: var(--ct-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--ct-cyan);
    text-transform: uppercase;
}

.ct-hero-meta {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
}

.ct-hero-meta div {
    display: flex;
    align-items: baseline;
    gap: 9px;
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.16em;
    color: var(--ct-faint);
}

.ct-hero-meta dt,
.ct-hero-meta .k { color: var(--ct-faint); }

.ct-hero-meta .v { color: var(--ct-muted); }

.ct-hero-meta .live {
    color: var(--ct-cyan);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.ct-hero-meta .live::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--ct-cyan);
    animation: ct-pulse 2.4s ease-in-out infinite;
}

@keyframes ct-pulse {
    0%, 100% { opacity: 0.45; }
    50% { opacity: 1; }
}

.ct-hero-title {
    font-family: 'Kanit', sans-serif;
    font-weight: 700;
    font-size: clamp(44px, 7.2vw, 92px);
    line-height: 0.98;
    letter-spacing: 0.005em;
    text-transform: uppercase;
    color: var(--ct-text);
    margin: 0;
}

.ct-hero-title .hollow {
    display: block;
    color: transparent;
    -webkit-text-stroke: 1px rgba(232, 237, 240, 0.42);
}

.ct-hero-copy {
    max-width: 560px;
    font-size: 15px;
    line-height: 1.65;
    color: var(--ct-muted);
}

/* 02 — BOARD (one frame, two systems) -------------------------------- */

.ct-board {
    position: relative;
    margin: 56px clamp(24px, 6vw, 96px) 0;
    border: 1px solid var(--ct-hairline-strong);
    background: linear-gradient(180deg, rgba(13, 20, 31, 0.5) 0%, rgba(10, 15, 24, 0.85) 100%);
}

.ct-board::before,
.ct-board::after {
    content: '';
    position: absolute;
    width: 14px;
    height: 14px;
    pointer-events: none;
}

.ct-board::before {
    top: -1px; left: -1px;
    border-top: 1px solid var(--ct-cyan);
    border-left: 1px solid var(--ct-cyan);
}

.ct-board::after {
    bottom: -1px; right: -1px;
    border-bottom: 1px solid var(--ct-cyan);
    border-right: 1px solid var(--ct-cyan);
}

.ct-board-grid {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}

/* left column — nodes */

.ct-nodes {
    padding: 40px clamp(24px, 3vw, 44px) 44px;
    border-right: 1px solid var(--ct-hairline);
    display: flex;
    flex-direction: column;
}

.ct-nodes-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 34px;
}

.ct-node {
    position: relative;
    padding: 18px 0 18px 34px;
    display: block;
    text-decoration: none;
    color: inherit;
}

.ct-node + .ct-node { border-top: none; }

.ct-node::before {          /* vertical rail */
    content: '';
    position: absolute;
    left: 3px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--ct-hairline-strong);
}

.ct-node::after {           /* node dot */
    content: '';
    position: absolute;
    left: 0;
    top: 24px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ct-bg);
    border: 1px solid var(--ct-faint);
    transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.ct-node:hover::after,
.ct-node.is-active::after {
    background: var(--ct-cyan);
    border-color: var(--ct-cyan);
    box-shadow: 0 0 0 3px rgba(6, 214, 229, 0.14);
}

.ct-node-meta {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 7px;
}

.ct-node-kicker {
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--ct-faint);
    transition: color 0.35s ease;
}

.ct-node:hover .ct-node-kicker,
.ct-node.is-active .ct-node-kicker { color: var(--ct-cyan); }

.ct-node-value {
    font-family: 'Kanit', sans-serif;
    font-weight: 500;
    font-size: 17px;
    letter-spacing: 0.01em;
    color: var(--ct-text);
    text-decoration: none;
}

.ct-node-sub {
    font-family: var(--ct-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--ct-muted);
    transition: color 0.35s ease;
}

.ct-node:hover .ct-node-sub { color: var(--ct-text); }

.ct-node-arrow {
    position: absolute;
    right: 4px;
    top: 22px;
    font-family: var(--ct-mono);
    font-size: 12px;
    color: transparent;
    transition: color 0.35s ease, transform 0.35s ease;
}

.ct-node:hover .ct-node-arrow { color: var(--ct-cyan); transform: translateX(3px); }

/* right column — transmission */

.ct-form-col {
    padding: 40px clamp(24px, 3.4vw, 52px) 44px;
    display: flex;
    flex-direction: column;
}

.ct-form-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 30px;
}

.ct-field {
    margin-bottom: 22px;
}

.ct-field-label {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 8px;
}

.ct-field-label .tag {
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--ct-cyan);
}

.ct-field-label .hint {
    font-family: var(--ct-mono);
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--ct-faint);
}

.ct-input {
    width: 100%;
    padding: 13px 14px;
    background: rgba(5, 7, 13, 0.6);
    border: 1px solid var(--ct-hairline-strong);
    border-radius: 0;
    color: var(--ct-text);
    font-family: 'Numans', sans-serif;
    font-size: 15px;
    transition: border-color 0.3s ease, background 0.3s ease;
}

.ct-input::placeholder { color: var(--ct-faint); font-size: 14px; }

.ct-input:focus {
    outline: none;
    border-color: var(--ct-cyan-dim);
    background: rgba(5, 7, 13, 0.85);
    box-shadow: inset 0 0 0 1px rgba(6, 214, 229, 0.12);
}

textarea.ct-input {
    resize: vertical;
    min-height: 128px;
    line-height: 1.6;
}

.ct-send {
    margin-top: 6px;
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 14px;
    padding: 15px 26px;
    background: transparent;
    border: 1px solid var(--ct-cyan-dim);
    border-radius: 0;
    color: var(--ct-text);
    font-family: 'Kanit', sans-serif;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

.ct-send:hover {
    background: var(--ct-cyan);
    border-color: var(--ct-cyan);
    color: #05070D;
}

.ct-send .arr {
    font-family: var(--ct-mono);
    font-size: 13px;
    transition: transform 0.35s ease;
}

.ct-send:hover .arr { transform: translateX(4px); }

/* 03 — EXTERNAL UPLINKS ---------------------------------------------- */

.ct-uplinks {
    margin: 26px clamp(24px, 6vw, 96px) 0;
}

.ct-uplinks-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 10px;
}

.ct-uplink-row {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr) auto;
    align-items: center;
    gap: 18px;
    padding: 17px 4px 17px 0;
    border-bottom: 1px solid var(--ct-hairline);
    text-decoration: none;
    color: inherit;
    position: relative;
}

.ct-uplink-row::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    height: 1px;
    width: 0;
    background: var(--ct-cyan);
    transition: width 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.ct-uplink-row:hover::after { width: 100%; }

.ct-uplink-idx {
    font-family: var(--ct-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--ct-faint);
    transition: color 0.35s ease;
}

.ct-uplink-row:hover .ct-uplink-idx { color: var(--ct-cyan); }

.ct-uplink-name {
    font-family: 'Kanit', sans-serif;
    font-weight: 500;
    font-size: 16px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ct-text);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.ct-uplink-row:hover .ct-uplink-name { transform: translateX(6px); }

.ct-uplink-name i {
    font-size: 13px;
    color: var(--ct-muted);
    transition: color 0.35s ease;
}

.ct-uplink-row:hover .ct-uplink-name i { color: var(--ct-cyan); }

.ct-uplink-arrow {
    font-family: var(--ct-mono);
    font-size: 12px;
    color: var(--ct-faint);
    transition: color 0.35s ease, transform 0.35s ease;
}

.ct-uplink-row:hover .ct-uplink-arrow { color: var(--ct-cyan); transform: translate(2px, -2px); }

/* 04 — SIGNAL FIELD (background canvas) ------------------------------ */

#ct-signal {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.55;
    pointer-events: none;
}

.ct-hero,
.ct-board,
.ct-uplinks,
.ct-sent {
    position: relative;
    z-index: 1;
}

/* 05 — TRANSMISSION SENT banner -------------------------------------- */

.ct-sent {
    display: none;
    margin: 40px clamp(24px, 6vw, 96px) 0;
    padding: 20px 24px;
    border: 1px solid rgba(57, 255, 136, 0.35);
    background: rgba(57, 255, 136, 0.06);
    align-items: center;
    gap: 14px;
}

.ct-sent.is-visible { display: flex; }

.ct-sent .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #39FF88;
    animation: ct-pulse 2.4s ease-in-out infinite;
}

.ct-sent .msg {
    font-family: var(--ct-mono);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: #39FF88;
}

.ct-sent .sub {
    font-size: 13px;
    color: var(--ct-muted);
    margin-left: auto;
}

/* 06 — RESPONSIVE ----------------------------------------------------- */

@media (max-width: 1020px) {
    .ct-board-grid { grid-template-columns: 1fr; }
    .ct-nodes { border-right: none; border-bottom: 1px solid var(--ct-hairline); }
}

@media (max-width: 760px) {
    .ct-hero { padding-top: calc(84px + 34px); }
    .ct-hero-meta { gap: 18px; }
    .ct-hero-copy { font-size: 14px; }
    .ct-send { width: 100%; justify-content: center; }
    .ct-sent .sub { display: none; }
    #ct-signal { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .ct-hero-meta .live::before,
    .ct-sent .dot { animation: none; }
    .ct-uplink-row::after { transition: none; }
}

/* ---- footer spacing bridge ------------------------------------------ */

.ct ~ .footer-new,
.ct + .footer-new { margin-top: 72px; }