:root {
    --matrix-green: #20c20e;
    --crt-bg: #0a0a0a;
    --terminal-gray: #888;
    --error-red: #ff3333;
    --verified-blue: #00ffff;
    --link-color: #7f7;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background: radial-gradient(var(--crt-bg), #000);
    font-family: 'Courier New', monospace;
    color: var(--matrix-green);
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

body::before { /* Scanlines effect */
    content: " ";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(32, 194, 14, 0.03) 2px, rgba(32, 194, 14, 0.03) 4px);
    pointer-events: none;
    animation: scanlines 8s linear infinite;
}

@keyframes scanlines { 0% { background-position: 0 0; } 100% { background-position: 0 10px; } }

.panel {
    width: 90%;
    max-width: 600px;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.88); /* Slightly more opaque */
    border: 1px solid var(--matrix-green);
    box-shadow: 0 0 20px var(--matrix-green);
    animation: glow 2s infinite alternate;
    display: flex;
    flex-direction: column;
    z-index: 5; /* Default panel z-index */
}
#login.panel { z-index: 10; }


@keyframes glow { from { box-shadow: 0 0 10px var(--matrix-green); } to { box-shadow: 0 0 30px var(--matrix-green); } }

.terminal-input {
    width: 100%; background: transparent; border: none;
    border-bottom: 1px solid var(--matrix-green); color: var(--matrix-green);
    font-family: inherit; font-size: 1.2rem; padding: 0.5rem 0; outline: none;
}
textarea.terminal-input { resize: vertical; min-height: 3em; max-height: 10em; overflow-y: auto; }
.terminal-input::placeholder { color: var(--terminal-gray); }

#login h1, #verifiedLogPanel h2 {
    font-size: 2rem; margin-bottom: 1rem; text-align: center;
    text-shadow: 0 0 10px var(--matrix-green);
}
#login p.subtitle { text-align: center; color: var(--terminal-gray); margin-bottom: 1rem;}

.hash-display {
    word-break: break-all; margin-top: 0.25rem; color: var(--terminal-gray);
    font-size: 0.8rem; text-align: center;
}

#chat {
    max-width: 800px; height: 90vh;
    position: relative; /* For potential modal overlays */
}

#messages, #verifiedMessages {
    flex: 1; border: 1px solid var(--matrix-green); padding: 1rem;
    overflow-y: auto; background: rgba(0, 0, 0, 0.88); margin-bottom: 1rem;
    box-shadow: 0 0 10px var(--matrix-green); position: relative;
    min-height: 200px;
}
#verifiedMessages { border-color: var(--verified-blue); box-shadow: 0 0 15px var(--verified-blue); }

.message {
    margin-bottom: 0.75rem; padding: 0.5rem;
    border-left: 2px solid var(--matrix-green); padding-left: 1rem;
    position: relative; animation: messageIn 0.3s ease-out; word-wrap: break-word;
}
@keyframes messageIn { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
.message.own { border-left-color: #0ff; color: #0ff; }
.message .sender { font-weight: bold; margin-right: 0.5rem; }
.message .time { font-size: 0.8rem; color: var(--terminal-gray); margin-left: 0.5rem; }
.message.system { border-left-style: dashed; }
.message.system .text { font-style: italic; color: var(--terminal-gray); }

.log-event {
     margin-bottom: 0.5rem; padding: 0.3rem 0.5rem; font-size: 0.9rem;
     border-left: 2px solid var(--terminal-gray);
     word-wrap: break-word;
}
.log-event.type-message-sent, .log-event.type-message-received { border-left-color: var(--matrix-green); }
.log-event.type-message-sent.own_event { border-left-color: var(--verified-blue); } /* Use actual class for this */
.log-event .event-type { font-weight: bold; margin-right: 0.5em; }
.log-event .event-time { font-size: 0.8em; color: #aaa; margin-right: 0.5em; }
.log-event .event-actor { color: #ccc; }
.log-event .event-data { color: var(--matrix-green); padding-left: 1em; display: block; white-space: pre-wrap;}

.hud {
    display: flex; flex-direction: column; gap: 0.75rem; padding: 1rem;
    background: rgba(0, 0, 0, 0.9); border: 1px solid var(--matrix-green);
}
.status-row, .connect-row, .actions-row { display: flex; align-items: center; gap: 0.75rem; }
#peerStatus, #participantContainer {
    padding: 0.5rem 1rem; background: var(--crt-bg); border: 1px solid var(--matrix-green);
    font-size: 0.9rem; text-align: center; box-shadow: 0 0 5px rgba(32, 194, 14, 0.3);
}
#peerStatus { min-width: 120px; flex-shrink: 0; }
#copyMyFullIdBtn { padding: 0.5rem; font-size: 1.2rem; line-height: 1; flex-shrink: 0; border-radius: 4px; }
#copyMyFullIdBtn:hover { box-shadow: 0 0 10px #0ff; }
#participantContainer { flex-grow: 1; text-align: left; overflow-x: auto; white-space: nowrap; min-height: calc(0.9rem + 1rem + 2px); }
#participantList { display: inline-block; }
#peerStatus.connected { color: #0ff; border-color: #0ff; box-shadow: 0 0 10px #0ff; }
.input-group { display: flex; gap: 0.5rem; flex: 1; }
#peerId { flex-grow: 1; }
.actions-row button { flex-grow: 1;}

.composer {
    display: flex; gap: 0.5rem; padding: 1rem; background: rgba(0, 0, 0, 0.9);
    border-top: 1px solid var(--matrix-green);
}
.composer textarea { flex: 1; resize: vertical; min-height: 3em; max-height: 10em; overflow-y: auto; border: 1px solid var(--matrix-green); padding: 0.5rem; background: rgba(0, 0, 0, 0.8); outline: none;}
.composer button { align-self: flex-start; padding: 0.5rem 1rem; flex-shrink: 0; }

button {
    background: transparent; color: var(--matrix-green); border: 1px solid var(--matrix-green);
    padding: 0.5rem 1rem; font-family: inherit; cursor: pointer; transition: all 0.3s;
}
button:hover { background: var(--matrix-green); color: #000; box-shadow: 0 0 10px var(--matrix-green); }
button:disabled { color: var(--terminal-gray); border-color: var(--terminal-gray); cursor: not-allowed; }
button:disabled:hover { background: transparent; box-shadow: none; }

.hidden { display: none !important; }
.terminal-input:focus::after, textarea.terminal-input:focus::after { content: "_"; display: inline-block; animation: blink 1s infinite; margin-left: 1px; line-height: 1em; }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

#matrix-rain {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; opacity: 0.1; z-index: -1;
}

.verification-section { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px dashed var(--terminal-gray); }
.verification-section h3 { font-size: 1.2rem; margin-bottom: 0.5rem; text-align: center; }
.verification-section input[type="file"] {
    display: block; margin: 0.5rem auto; width: 90%; padding: 0.5rem;
    background: var(--crt-bg); border: 1px solid var(--matrix-green); color: var(--matrix-green);
}
.verification-section .button-group { display: flex; gap: 0.5rem; justify-content: center; }
#verificationStatus { margin-top: 0.5rem; text-align: center; font-weight: bold; min-height: 1.2em; /* Reserve space */ }
#verificationStatus.valid { color: var(--verified-blue); }
#verificationStatus.invalid { color: var(--error-red); }

#verifiedLogPanel {
    width: 90%; max-width: 800px; height: 90vh;
    border-color: var(--verified-blue); box-shadow: 0 0 20px var(--verified-blue);
    position: fixed;
    top: 50%; left: 50%; transform: translate(-50%, -50%);
    z-index: 100;
}
#verifiedLogPanel .panel-header { display:flex; justify-content: space-between; align-items: center; margin-bottom: 1rem;}

.links-footer {
    text-align: center; margin-top: 1.5rem; font-size: 0.8rem; color: var(--terminal-gray);
}
.links-footer a { color: var(--link-color); text-decoration: underline; margin: 0 5px; }
.links-footer a:hover { color: var(--matrix-green); }


@media (max-width: 700px) {
    .panel { padding: 1rem; }
    #chat, #verifiedLogPanel { height: 95vh; width: 95%;}
    .status-row, .actions-row { flex-direction: column; align-items: stretch; }
    #peerStatus, #copyMyFullIdBtn, #participantContainer { width: 100%; margin-bottom: 0.5rem; text-align: center; }
    #participantContainer { text-align: left; }
    #copyMyFullIdBtn { margin-left: 0; }
    .connect-row .input-group #peerId { min-width: 100px; }
    .composer { flex-direction: column; }
    .composer textarea, .composer button { width: 100%; }
    .composer button { margin-top: 0.5rem; }
    .verification-section input[type="file"] { width: 100%; }
}