/* ============================================================
   DUBB45 Radio Calculator v2.4
   Blends into the dark blue-navy site background.
   Accent: white/steel — no loud red.
   ============================================================ */

:root {
    --d-bg:       #0f1628;
    --d-bg2:      #131c33;
    --d-bg3:      #111929;
    --d-border:   rgba(255,255,255,0.09);
    --d-border2:  rgba(255,255,255,0.15);
    --d-accent:   #ffffff;
    --d-accent2:  rgba(255,255,255,0.65);
    --d-text:     #e0e4ef;
    --d-muted:    #8a92a8;
    --d-dim:      #4a5068;
    --d-btn:      rgba(255,255,255,0.10);
    --d-btn-hov:  rgba(255,255,255,0.16);
    --d-red:      #e94560;
    --d-red-glow: rgba(233,69,96,0.18);
    --d-mono:     'Courier New', 'Lucida Console', monospace;
}

/* --- Wrapper --- */
.dubb45-calc-wrap {
    max-width: 580px;
    margin: 0 auto;
    font-family: 'Inter', 'Segoe UI', sans-serif;
}

/* --- Input card --- */
.dubb45-input-group {
    background: var(--d-bg2);
    border: 1px solid var(--d-border);
    border-top: 1px solid var(--d-border2);
    border-radius: 6px 6px 0 0;
    padding: 26px 28px 22px;
    position: relative;
}

/* Subtle top line — white, not red */
.dubb45-input-group::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255,255,255,0.25) 30%,
        rgba(255,255,255,0.25) 70%,
        transparent 100%
    );
}

.dubb45-label {
    display: block;
    font-size: .7rem;
    font-weight: 600;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--d-muted);
    margin-bottom: 4px;
}

.dubb45-hint {
    font-family: var(--d-mono);
    font-size: .72rem;
    color: var(--d-dim);
    margin: 0 0 14px;
    letter-spacing: .05em;
}

.dubb45-input-row {
    display: flex;
    gap: 10px;
}

/* --- Serial input --- */
.dubb45-serial-input {
    flex: 1;
    background: var(--d-bg);
    border: 1px solid var(--d-border);
    color: var(--d-text);
    font-family: var(--d-mono);
    font-size: 1.05rem;
    letter-spacing: .14em;
    padding: 11px 14px;
    border-radius: 4px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    -webkit-appearance: none;
}

.dubb45-serial-input:focus {
    border-color: var(--d-border2);
    box-shadow: 0 0 0 3px rgba(255,255,255,0.06);
}

.dubb45-serial-input::placeholder {
    color: var(--d-dim);
    font-size: .8rem;
    letter-spacing: .04em;
}

.dubb45-upper { text-transform: uppercase; }

/* --- Button — dark steel, no loud color --- */
.dubb45-submit-btn {
    background: var(--d-btn);
    color: var(--d-text);
    border: 1px solid var(--d-border2);
    font-family: 'Inter', 'Segoe UI', sans-serif;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .22em;
    text-transform: uppercase;
    padding: 11px 20px;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    transition: background .18s, border-color .18s, color .18s;
    flex-shrink: 0;
}

.dubb45-submit-btn:hover {
    background: var(--d-btn-hov);
    border-color: rgba(255,255,255,0.28);
    color: #fff;
}

.dubb45-submit-btn:active  { transform: scale(.97); }
.dubb45-submit-btn:disabled {
    opacity: .4;
    cursor: not-allowed;
}

/* --- Result panel --- */
.dubb45-result {
    background: var(--d-bg3);
    border: 1px solid var(--d-border);
    border-top: none;
    border-radius: 0 0 6px 6px;
    padding: 20px 28px;
    display: flex;
    align-items: center;
    gap: 16px;
    animation: d45in .25s ease;
}

@keyframes d45in {
    from { opacity:0; transform:translateY(-4px); }
    to   { opacity:1; transform:translateY(0); }
}

.dubb45-result-label {
    font-size: .64rem;
    font-weight: 700;
    letter-spacing: .24em;
    text-transform: uppercase;
    color: var(--d-muted);
    flex-shrink: 0;
    white-space: nowrap;
}

.dubb45-result-code {
    font-family: var(--d-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--d-accent);
    letter-spacing: .4em;
    flex: 1;
    text-align: center;
}

.dubb45-copy-btn {
    background: transparent;
    border: 1px solid var(--d-border);
    color: var(--d-dim);
    font-family: var(--d-mono);
    font-size: .64rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color .2s, color .2s;
}

.dubb45-copy-btn:hover {
    border-color: var(--d-border2);
    color: var(--d-text);
}

/* --- Error --- */
.dubb45-error {
    background: rgba(233,69,96,0.07);
    border: 1px solid rgba(233,69,96,0.22);
    border-top: none;
    color: #f08090;
    font-family: var(--d-mono);
    font-size: .76rem;
    padding: 11px 16px;
    border-radius: 0 0 6px 6px;
    animation: d45in .2s ease;
    line-height: 1.5;
}

/* --- Spinner --- */
.dubb45-spinner {
    font-family: var(--d-mono);
    font-size: .7rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--d-muted);
    padding: 14px 28px;
    animation: d45pulse 1.1s ease-in-out infinite;
}

@keyframes d45pulse {
    0%,100% { opacity:1; }
    50%      { opacity:.3; }
}

/* --- Mobile --- */
@media (max-width: 520px) {
    .dubb45-input-group { padding: 20px 18px 18px; }
    .dubb45-input-row   { flex-direction: column; }
    .dubb45-submit-btn  { width: 100%; padding: 12px; }
    .dubb45-result      { flex-wrap: wrap; justify-content: center; text-align: center; padding: 18px; }
    .dubb45-result-code { font-size: 1.5rem; width: 100%; }
    .dubb45-result-label { display: none; }
}