html, body {
    margin: 0;
    padding: 0;
    background: #000;
    color: #ffb000;
    font-family: monospace;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.2px;
    line-height: 1.35;
    min-height: 100vh;
}

#terminal {
    padding: 16px 18px 24px 18px;
    max-width: 100ch;
}

#scrollback {
    white-space: pre-wrap;
}

.motd,
.echo,
.output {
    margin: 0;
    white-space: pre-wrap;
    font-family: inherit;
    color: inherit;
}

.exchange {
    margin: 0;
}

.echo {
    white-space: pre-wrap;
    word-break: break-all;
}

.output {
    margin: 0 0 0.4em 0;
}

.prompt {
    color: #ffb000;
    /* preserve the trailing space we put in the label so the live and echo
       rows share an identical monospace gap between prompt and command. */
    white-space: pre;
}

#prompt-line {
    display: flex;
    align-items: baseline;
    margin: 0;
}

#prompt-line .prompt {
    flex-shrink: 0;
}

.input-wrap {
    flex: 1;
    min-width: 0;
    position: relative;
    display: inline-block;
    line-height: inherit;
}

.input-wrap input {
    width: 100%;
    min-width: 0;
    background: transparent;
    border: 0;
    margin: 0;
    padding: 0;
    text-indent: 0;
    outline: none;
    color: #ffb000;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    letter-spacing: inherit;
    caret-color: #ffb000;
    appearance: none;
    -webkit-appearance: none;
}

/* Hidden mirror used to measure the pixel width of typed text up to the
   caret position, so the fake block cursor lands in the right spot. */
.crt-cursor-measure {
    visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    white-space: pre;
    font: inherit;
    line-height: inherit;
}

/* Block cursor: hidden outside CRT mode. */
.crt-cursor {
    display: none;
}

::selection {
    background: #553600;
    color: #ffd773;
}

/* ─── CRT mode ────────────────────────────────────────────────────────────
   Opt-in via `body.crt`. All overlays use pointer-events: none so input
   behavior is untouched. Honors prefers-reduced-motion. */

body.crt::before {
    /* scanlines — 1px dark every 3px, stronger contrast than the first pass */
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.36) 0,
        rgba(0, 0, 0, 0.36) 1px,
        transparent 1px,
        transparent 3px
    );
}

body.crt::after {
    /* vignette + warm-center falloff — fakes a slightly bowed phosphor tube */
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9998;
    background:
        radial-gradient(
            ellipse at center,
            rgba(255, 176, 0, 0.045) 0%,
            transparent 28%,
            rgba(0, 0, 0, 0.32) 65%,
            rgba(0, 0, 0, 0.78) 100%
        );
}

body.crt #terminal::before {
    /* shimmer — a faint amber band that drifts down the screen */
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9997;
    background: linear-gradient(
        180deg,
        transparent 0%,
        rgba(255, 176, 0, 0.05) 50%,
        transparent 100%
    );
    background-size: 100% 28vh;
    background-repeat: no-repeat;
    animation: crt-shimmer 7s linear infinite;
}

body.crt #terminal {
    /* phosphor glow — three-layer halo + slow opacity breathing */
    text-shadow:
        0 0 1px rgba(255, 176, 0, 0.85),
        0 0 4px rgba(255, 176, 0, 0.45),
        0 0 12px rgba(255, 176, 0, 0.22);
    animation: crt-flicker 4.2s linear infinite;
}

body.crt .input-wrap input {
    /* inputs don't always inherit text-shadow under UA styles */
    text-shadow: inherit;
    /* hide native caret; the .crt-cursor span takes over */
    caret-color: transparent;
}

/* block cursor — visible only in CRT mode. Hollow outline when unfocused,
   solid blinking amber when focused. JS sets `left` based on caret column. */
body.crt .input-wrap .crt-cursor {
    display: inline-block;
    position: absolute;
    top: 0;
    left: 0;
    width: 1ch;
    height: 1.35em;
    box-sizing: border-box;
    pointer-events: none;
}

body.crt .input-wrap:not(:focus-within) .crt-cursor {
    background: transparent;
    border: 1px solid rgba(255, 176, 0, 0.4);
}

body.crt .input-wrap:focus-within .crt-cursor {
    background: rgba(255, 176, 0, 0.85);
    box-shadow: 0 0 6px rgba(255, 176, 0, 0.55);
    animation: crt-blink 1s steps(2) infinite;
}

/* phosphor persistence — applied briefly to each new exchange/output block */
body.crt .phosphor-burst {
    animation: phosphor-burst 200ms ease-out;
}

@keyframes crt-flicker {
      0% { opacity: 1; }
     47% { opacity: 0.985; }
     52% { opacity: 0.99; }
     73% { opacity: 0.98; }
     79% { opacity: 1; }
    100% { opacity: 1; }
}

@keyframes crt-blink {
      0% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes crt-shimmer {
      0% { background-position: 0 -28vh; }
    100% { background-position: 0 128vh; }
}

@keyframes phosphor-burst {
    0% {
        opacity: 0.88;
        filter: blur(0.4px);
        text-shadow:
            0 0 1px rgba(255, 176, 0, 1),
            0 0 6px rgba(255, 176, 0, 0.7),
            0 0 16px rgba(255, 176, 0, 0.4);
    }
    100% {
        opacity: 1;
        filter: blur(0);
        text-shadow:
            0 0 1px rgba(255, 176, 0, 0.85),
            0 0 4px rgba(255, 176, 0, 0.45),
            0 0 12px rgba(255, 176, 0, 0.22);
    }
}

@media (prefers-reduced-motion: reduce) {
    body.crt #terminal,
    body.crt #terminal::before,
    body.crt .input-wrap:focus-within .crt-cursor,
    body.crt .phosphor-burst {
        animation: none;
    }
}