/* ─── Tokens ─────────────────────────────────────────────────────────────── */
:root {
    --bg:            #030d12;
    --surface:       #071820;
    --surface-hi:    #0a2030;
    --border:        #0d3548;
    --border-hi:     #1a5570;
    --primary:       #00d4aa;
    --primary-dim:   #005540;
    --primary-glow:  rgba(0, 212, 170, 0.18);
    --danger:        #ff4422;
    --danger-glow:   rgba(255, 68, 34, 0.22);
    --text:          #7ab8b0;
    --text-bright:   #c8ede8;
    --text-muted:    #2a5050;
    --mono:          'Share Tech Mono', 'Courier New', monospace;
    --display:       'Rajdhani', sans-serif;
}

/* ─── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

/* ─── Base ───────────────────────────────────────────────────────────────── */
html {
    font-size: 24px;
}

html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--mono);
    overflow-x: hidden;
}

/* ─── Background effects ─────────────────────────────────────────────────── */
.grid-bg {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 170, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 170, 0.035) 1px, transparent 1px);
    background-size: 66px 66px;
    animation: grid-drift 40s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes grid-drift {
    to { background-position: 66px 66px; }
}

.scan-lines {
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.18) 2px,
        rgba(0, 0, 0, 0.18) 3px
    );
    pointer-events: none;
    z-index: 100;
    opacity: 0.5;
}

/* ─── Layout ─────────────────────────────────────────────────────────────── */
#app {
    position: relative;
    z-index: 1;
    max-width: 740px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 3rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ─── Header ─────────────────────────────────────────────────────────────── */
header {
    text-align: center;
    padding-top: 0.5rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-hex {
    width: 55px;
    height: 64px;
    color: var(--primary);
    filter: drop-shadow(0 0 8px rgba(0, 212, 170, 0.5));
    animation: hex-breathe 4s ease-in-out infinite;
}

@keyframes hex-breathe {
    0%, 100% { filter: drop-shadow(0 0 8px rgba(0, 212, 170, 0.5)); }
    50%       { filter: drop-shadow(0 0 18px rgba(0, 212, 170, 0.85)); }
}

.logo-text {
    font-family: var(--display);
    font-size: 2.6rem;
    font-weight: 600;
    letter-spacing: 0.35em;
    color: var(--text-bright);
    text-shadow: 0 0 40px rgba(0, 212, 170, 0.3);
}

.tagline {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* ─── Join form ──────────────────────────────────────────────────────────── */
#join-form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

/* Sonar animation */
.sonar-wrap {
    position: relative;
    width: 264px;
    height: 264px;
    flex-shrink: 0;
}

.sonar-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--primary);
    inset: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    animation: sonar-expand 3.6s ease-out infinite;
}
.sonar-ring.r1 { width: 106px; height: 106px; animation-delay: 0s; }
.sonar-ring.r2 { width: 180px; height: 180px; animation-delay: 1.2s; }
.sonar-ring.r3 { width: 254px; height: 254px; animation-delay: 2.4s; }

@keyframes sonar-expand {
    0%   { transform: translate(-50%, -50%) scale(0.15); opacity: 0.9; }
    100% { transform: translate(-50%, -50%) scale(1);    opacity: 0; }
}

.sonar-core {
    position: absolute;
    width: 22px;
    height: 22px;
    background: var(--primary);
    border-radius: 50%;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 14px var(--primary), 0 0 30px var(--primary-glow);
    animation: core-pulse 2s ease-in-out infinite;
}

@keyframes core-pulse {
    0%, 100% { box-shadow: 0 0 14px var(--primary), 0 0 30px var(--primary-glow); }
    50%       { box-shadow: 0 0 22px var(--primary), 0 0 50px rgba(0,212,170,0.35); }
}

.sonar-sweep {
    position: absolute;
    width: 126px;
    height: 1px;
    top: 50%; left: 50%;
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--primary), transparent);
    opacity: 0.4;
    animation: sweep 4s linear infinite;
}

@keyframes sweep {
    to { transform: rotate(360deg); }
}

/* Input */
.field-group {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.field-label {
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.field-row {
    display: flex;
    align-items: stretch;
    border: 1px solid var(--border);
    background: var(--surface);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field-row:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary), 0 0 24px var(--primary-glow);
}

.field-prefix {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    color: var(--primary-dim);
    font-size: 1rem;
    border-right: 1px solid var(--border);
    user-select: none;
}

#room-id {
    flex: 1;
    padding: 0.85rem 0.9rem;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--mono);
    font-size: 0.95rem;
    color: var(--text-bright);
    caret-color: var(--primary);
    min-width: 0;
}

#room-id::placeholder { color: var(--text-muted); }

#join-btn {
    padding: 0 1.4rem;
    background: var(--primary);
    border: none;
    color: var(--bg);
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}

#join-btn:hover:not(:disabled) {
    background: #00ffcc;
    box-shadow: 0 0 24px rgba(0, 255, 204, 0.35);
}

#join-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* ─── Controls / Active session ──────────────────────────────────────────── */
#controls {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    border: 1px solid var(--border);
    background: var(--surface);
    padding: 1.2rem;
    animation: slide-in 0.35s ease-out;
}

@keyframes slide-in {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Session bar */
.session-bar {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.live-indicator {
    width: 11px;
    height: 11px;
    background: var(--danger);
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 8px var(--danger);
    animation: live-blink 1.4s ease-in-out infinite;
}

@keyframes live-blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.2; }
}

.live-label {
    font-size: 0.65rem;
    color: var(--danger);
    letter-spacing: 0.18em;
    font-weight: 700;
    flex-shrink: 0;
}

.session-channel {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-channel strong {
    color: var(--primary);
    font-weight: normal;
}

#leave-btn {
    padding: 0.35rem 0.75rem;
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s;
    flex-shrink: 0;
}

#leave-btn:hover {
    background: var(--danger);
    color: #fff;
    box-shadow: 0 0 16px var(--danger-glow);
}

/* Stats row */
.session-stats {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: start;
}

.stat-block {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.stat-label {
    font-size: 0.62rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
}

#peer-id {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--primary);
    word-break: break-all;
    background: none;
}

.stat-number {
    font-family: var(--display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-bright);
    line-height: 1;
    text-align: right;
}

/* Nodes panel */
.nodes-panel { display: flex; flex-direction: column; gap: 0.5rem; }

.panel-label {
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    color: var(--text-muted);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--mono);
    width: 100%;
    text-align: left;
    padding: 0;
}

.panel-toggle:hover {
    color: var(--text);
}

.toggle-chevron {
    margin-left: auto;
    transition: transform 0.2s;
}

.panel-toggle[aria-expanded="false"] .toggle-chevron {
    transform: rotate(-90deg);
}

#peer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

#peer-list li {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    background: rgba(0, 212, 170, 0.025);
    font-size: 0.85rem;
    color: var(--text);
    animation: node-enter 0.3s ease-out;
    transition: border-color 0.2s, background 0.2s;
}

#peer-list li:hover {
    border-color: var(--border-hi);
    background: rgba(0, 212, 170, 0.05);
}

@keyframes node-enter {
    from { opacity: 0; transform: translateX(-12px); }
    to   { opacity: 1; transform: translateX(0); }
}

#peer-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 7px var(--primary);
    animation: node-dot-pulse 2.5s ease-in-out infinite;
}

@keyframes node-dot-pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.35; }
}

.no-peers-msg {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding: 0.4rem 0;
    font-style: italic;
}

/* ─── Log panel ──────────────────────────────────────────────────────────── */
.log-panel {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cursor-blink {
    color: var(--primary);
    animation: cursor-flash 1.1s step-end infinite;
}

@keyframes cursor-flash {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}

#status-log {
    max-height: 240px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

#status-log p {
    display: flex;
    gap: 0.9rem;
    padding: 0.22rem 0;
    border-bottom: 1px solid rgba(13, 53, 72, 0.6);
    line-height: 1.5;
    animation: log-appear 0.2s ease-out;
}

@keyframes log-appear {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.log-ts {
    color: var(--text-muted);
    font-size: 0.72rem;
    flex-shrink: 0;
    padding-top: 0.1em;
}

.log-msg {
    font-size: 0.8rem;
    color: var(--text);
}

/* ─── Thumbnail ─────────────────────────────────────────────────────────── */
.tournaments-panel {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.thumbnail {
    width: 100%;
    display: block;
    opacity: 0.55;
    filter: saturate(0.7) sepia(0.2);
    border: 1px solid var(--border);
    transition: opacity 0.3s, filter 0.3s;
}

.thumbnail:hover {
    opacity: 0.85;
    filter: saturate(1) sepia(0);
}

.founders-history {
    margin: 0;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text);
    line-height: 1.7;
    letter-spacing: 0.02em;
}

.founders-quote {
    margin: 0;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--text);
    letter-spacing: 0.04em;
    padding: 0.5rem 0.75rem;
    border-left: 2px solid var(--primary);
    background: rgba(0, 212, 170, 0.03);
    box-shadow: inset 4px 0 16px var(--primary-glow);
}

/* ─── Scrollbar ──────────────────────────────────────────────────────────── */
#status-log::-webkit-scrollbar       { width: 4px; }
#status-log::-webkit-scrollbar-track { background: transparent; }
#status-log::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }