@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Orbitron:wght@400;700;900&family=IBM+Plex+Mono:wght@300;400;600&display=swap');

/* ── Variables ── */
:root {
    --bg:        #050a0f;
    --bg2:       #0a1520;
    --bg3:       #0f1f30;
    --panel:     #091826;
    --border:    #0d3d5e;
    --border2:   #1a5f8a;
    --neon:      #00e5ff;
    --neon2:     #00ff9d;
    --neon3:     #ff4d6d;
    --text:      #c8e8f4;
    --muted:     #4a7a9b;
    --accent:    #ff9f1c;
    --glow:      0 0 20px rgba(0,229,255,0.4);
    --glow2:     0 0 20px rgba(0,255,157,0.35);
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'IBM Plex Mono', monospace;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ── Animated grid background ── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: gridShift 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

/* ── Scanline effect ── */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.08) 2px,
        rgba(0,0,0,0.08) 4px
    );
    pointer-events: none;
    z-index: 999;
}

@keyframes gridShift {
    0% { transform: translateY(0); }
    100% { transform: translateY(40px); }
}

/* ── Header ── */
header {
    position: relative;
    background: linear-gradient(135deg, #051525 0%, #0a2540 50%, #051525 100%);
    border-bottom: 2px solid var(--border2);
    padding: 36px 20px 28px;
    text-align: center;
    overflow: hidden;
    z-index: 1;
}

header::before {
    content: '01001001 00100000 01000011 01001001 01010000 01001000 01000101 01010010';
    position: absolute;
    top: 8px;
    left: 0; right: 0;
    font-family: 'Share Tech Mono', monospace;
    font-size: 10px;
    color: rgba(0,229,255,0.12);
    letter-spacing: 3px;
    white-space: nowrap;
    overflow: hidden;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0; left: 10%; right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon), transparent);
    box-shadow: var(--glow);
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.4rem, 4vw, 2.2rem);
    font-weight: 900;
    letter-spacing: 4px;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--neon), var(--neon2), var(--neon));
    background-size: 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s linear infinite;
    text-shadow: none;
    margin-bottom: 8px;
}

header p {
    font-family: 'Share Tech Mono', monospace;
    color: var(--muted);
    font-size: 0.78rem;
    letter-spacing: 6px;
    text-transform: uppercase;
}

/* ── Status bar under header ── */
.status-bar {
    display: flex;
    justify-content: center;
    gap: 32px;
    padding: 8px 20px;
    background: #020d18;
    border-bottom: 1px solid var(--border);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.7rem;
    color: var(--muted);
    letter-spacing: 2px;
    position: relative;
    z-index: 1;
}

.status-bar span::before {
    content: '◉ ';
    color: var(--neon2);
    animation: blink 1.5s step-end infinite;
}

@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.2} }
@keyframes shimmer { 0%{background-position:0%} 100%{background-position:200%} }

/* ── Main layout ── */
main {
    max-width: 980px;
    margin: 0 auto;
    padding: 32px 20px;
    position: relative;
    z-index: 1;
}

/* ── Section labels ── */
.section-label {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: var(--neon);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-label::before { content: '//'; color: var(--muted); }
.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--border2), transparent);
}

/* ── Panel cards ── */
.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 24px;
    margin-bottom: 24px;
    position: relative;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.panel:hover {
    border-color: var(--border2);
    box-shadow: 0 0 30px rgba(0,229,255,0.08);
}

/* corner accents */
.panel::before, .panel::after {
    content: '';
    position: absolute;
    width: 12px; height: 12px;
    border-color: var(--neon);
    border-style: solid;
}

.panel::before { top: -1px; left: -1px; border-width: 2px 0 0 2px; }
.panel::after  { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }

/* ── h2 titles inside panels ── */
h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--neon);
    margin-bottom: 18px;
}

h3 {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.78rem;
    letter-spacing: 2px;
    color: var(--neon2);
    text-transform: uppercase;
    margin: 18px 0 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

h3::before { content: '>_'; color: var(--muted); font-size: 0.7rem; }

/* ── Textarea ── */
textarea {
    width: 100%;
    background: #020d18;
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--neon2);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.7;
    padding: 14px;
    resize: vertical;
    transition: border-color 0.3s, box-shadow 0.3s;
    caret-color: var(--neon);
    letter-spacing: 1px;
}

textarea::placeholder { color: rgba(74,122,155,0.5); }

textarea:focus {
    outline: none;
    border-color: var(--neon);
    box-shadow: 0 0 0 1px var(--neon), inset 0 0 20px rgba(0,229,255,0.04);
}

/* ── Inputs ── */
input[type="number"],
input[type="text"] {
    background: #020d18;
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.82rem;
    padding: 9px 14px;
    width: 120px;
    transition: border-color 0.3s;
    letter-spacing: 1px;
}

input:focus {
    outline: none;
    border-color: var(--neon2);
    box-shadow: 0 0 0 1px var(--neon2);
}

/* ── Button strip ── */
.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

/* ── Buttons ── */
button {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.78rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 11px 22px;
    border: 1px solid var(--neon);
    border-radius: 2px;
    background: transparent;
    color: var(--neon);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: color 0.25s, background 0.25s, box-shadow 0.25s;
}

button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--neon);
    transform: translateX(-100%);
    transition: transform 0.25s;
    z-index: -1;
}

button:hover {
    color: var(--bg);
    box-shadow: var(--glow);
}

button:hover::before { transform: translateX(0); }

button:active { transform: scale(0.97); }

/* Variant: secondary (green) */
button.btn-green {
    border-color: var(--neon2);
    color: var(--neon2);
}

button.btn-green::before { background: var(--neon2); }
button.btn-green:hover { box-shadow: var(--glow2); }

/* Variant: danger (red) */
button.btn-red {
    border-color: var(--neon3);
    color: var(--neon3);
}

button.btn-red::before { background: var(--neon3); }

/* ── Input row ── */
.input-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.input-row label {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.75rem;
    color: var(--muted);
    letter-spacing: 1px;
    min-width: 20px;
}

/* ── Results panel ── */
.resultados {
    background: #020d18;
    border: 1px solid var(--border2);
    border-radius: 2px;
    padding: 20px;
    margin-top: 4px;
    position: relative;
}

.resultados::before {
    content: 'OUTPUT';
    position: absolute;
    top: -10px;
    left: 16px;
    background: #020d18;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 4px;
    color: var(--neon);
    padding: 0 8px;
}

#salida, #salidaCifrado {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.9;
    color: var(--neon2);
    white-space: pre-wrap;
    word-break: break-all;
    min-height: 40px;
}

#salida:empty::before,
#salidaCifrado:empty::before {
    content: '█ Esperando datos...';
    color: rgba(0,229,255,0.2);
    animation: blink 1.2s step-end infinite;
}

/* ── Cipher sub-sections ── */
.cifrado {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px 40px;
    position: relative;
    z-index: 1;
}

.cipher-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.cipher-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 18px;
    position: relative;
    transition: border-color 0.3s;
}

.cipher-card:hover { border-color: var(--neon2); }

.cipher-card::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px;
    width: 10px; height: 10px;
    border-top: 2px solid var(--neon2);
    border-left: 2px solid var(--neon2);
}

/* ── Divider ── */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border2), transparent);
    margin: 32px 0;
    position: relative;
    z-index: 1;
}

/* ── Footer ── */
footer {
    text-align: center;
    padding: 20px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 3px;
    color: var(--border);
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    header { padding: 24px 16px; }
    .status-bar { gap: 16px; font-size: 0.6rem; }
    button { padding: 9px 14px; font-size: 0.7rem; }
    .cipher-grid { grid-template-columns: 1fr; }
}