:root {
    --bg-base: #eef2f6;
    --bg-surface: rgba(255, 255, 255, 0.75);
    --bg-chat: #e8ecf4;
    --bg-input: rgba(240, 242, 245, 0.65);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-50: rgba(239, 246, 255, 0.7);
    --blue-100: rgba(219, 234, 254, 0.7);
    --indigo-500: #6366f1;
    --indigo-600: #4f46e5;
    --emerald-500: #10b981;
    --amber-500: #f59e0b;
    --red-500: #ef4444;
    --bubble-sent: linear-gradient(135deg, rgba(59, 130, 246, 0.92), rgba(99, 102, 241, 0.92));
    --bubble-sent-text: #ffffff;
    --bubble-recv-bg: rgba(255, 255, 255, 0.78);
    --bubble-recv-text: #0f172a;
    --border: rgba(226, 232, 240, 0.8);
    --border-glass: rgba(255, 255, 255, 0.55);
    --border-strong: rgba(203, 213, 225, 0.9);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.12);
    --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 30px rgba(0,0,0,0.12);
    --shadow-xl: 0 24px 48px rgba(0,0,0,0.18);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --glass-blur: blur(20px) saturate(180%);
    --glass-blur-sm: blur(12px) saturate(160%);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html, body { height:100%; overflow:hidden; }
body {
    font-family: var(--font);
    background: linear-gradient(135deg, #e0e7ff 0%, #fae8ff 35%, #e0f2fe 70%, #dcfce7 100%);
    background-size: 300% 300%;
    animation: wallpaperShift 25s ease infinite;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}
.hidden { display:none !important; }

.app {
    display: flex; flex-direction: column; height: 100vh; height: 100dvh;
    max-width: 520px; margin: 0 auto;
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-left: 1px solid var(--border-glass);
    border-right: 1px solid var(--border-glass);
    box-shadow: var(--shadow-glass);
    position: relative; overflow: hidden;
}

/* ===== Header (Glassmorphism) ===== */
.header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 18px;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-glass);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    z-index: 20; flex-shrink: 0;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-logo {
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--blue-500), var(--indigo-500));
    border-radius: var(--radius-md); color: white; flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
    animation: logoFloat 4s ease-in-out infinite;
}
.header-info h1 { font-size: 16px; font-weight: 700; letter-spacing: -0.3px; }
.header-actions { display: flex; align-items: center; gap: 6px; }
.status-row { display: flex; align-items: center; gap: 6px; margin-top: 1px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-tertiary); transition: background 0.3s, box-shadow 0.3s; }
.status-dot.connected { background: var(--emerald-500); box-shadow: 0 0 0 3px rgba(16,185,129,0.2); animation: connectedPulse 2s ease-in-out infinite; }
.status-dot.waiting { background: var(--amber-500); box-shadow: 0 0 0 3px rgba(245,158,11,0.2); animation: pulse 1.5s ease-in-out infinite; }
.status-dot.disconnected { background: var(--red-500); box-shadow: 0 0 0 3px rgba(239,68,68,0.2); }
.status-text { font-size: 11px; font-weight: 500; color: var(--text-tertiary); }
.icon-btn {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--border-glass); border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.4); backdrop-filter: blur(8px);
    color: var(--text-secondary); cursor: pointer; transition: all 0.2s var(--ease);
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.75); color: var(--text-primary); transform: scale(1.08); box-shadow: var(--shadow-sm); }

/* ===== Sun / Moon Toggle Slider ===== */
.mode-toggle { display: flex; align-items: center; }
.mode-switch-input { display: none; }
.mode-switch-label {
    position: relative; display: flex; align-items: center;
    width: 58px; height: 30px;
    background: linear-gradient(135deg, rgba(254, 243, 199, 0.9), rgba(253, 230, 138, 0.9));
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full); cursor: pointer;
    transition: background 0.4s var(--ease);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
    overflow: hidden;
}
.mode-switch-input:checked + .mode-switch-label {
    background: linear-gradient(135deg, rgba(30, 27, 75, 0.9), rgba(49, 46, 129, 0.9));
}
.mode-icon {
    position: absolute; top: 50%; transform: translateY(-50%);
    font-size: 14px; transition: opacity 0.3s, transform 0.3s; z-index: 1;
}
.mode-sun { left: 7px; opacity: 1; }
.mode-moon { right: 7px; opacity: 0.5; }
.mode-switch-input:checked + .mode-switch-label .mode-sun { opacity: 0.5; }
.mode-switch-input:checked + .mode-switch-label .mode-moon { opacity: 1; }
.mode-switch-slider {
    position: absolute; top: 3px; left: 3px;
    width: 24px; height: 24px;
    background: white; border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
    transition: transform 0.35s var(--spring);
}
.mode-switch-input:checked + .mode-switch-label .mode-switch-slider { transform: translateX(28px); }

/* ===== Lobby ===== */
.lobby { flex:1; overflow-y:auto; display:flex; align-items:flex-start; justify-content:center; padding:28px 20px 40px; animation:fadeSlideUp 0.4s var(--ease); }
.lobby-content { width:100%; max-width:440px; }
.lobby-hero { text-align:center; margin-bottom:28px; }
.hero-icon {
    width:72px; height:72px; display:flex; align-items:center; justify-content:center;
    background: rgba(255, 255, 255, 0.6); backdrop-filter: var(--glass-blur-sm);
    border: 1px solid var(--border-glass); border-radius: 24px; margin:0 auto 16px;
    color: var(--blue-500); box-shadow: var(--shadow-glass);
    animation: heroGlow 3s ease-in-out infinite alternate;
}
.lobby-hero h2 { font-size:22px; font-weight:800; letter-spacing:-0.5px; }
.lobby-hero p { font-size:13px; color:var(--text-secondary); margin-top:4px; line-height:1.5; }
.lobby-field { margin-bottom:24px; }
.lobby-field label { display:block; font-size:12px; font-weight:600; color:var(--text-secondary); margin-bottom:6px; text-transform:uppercase; letter-spacing:0.5px; }
.lobby-field input {
    width:100%; padding:12px 16px; border:1px solid var(--border-glass);
    border-radius:var(--radius-md); font-family:var(--font); font-size:15px;
    color:var(--text-primary); background:rgba(255,255,255,0.6);
    backdrop-filter:blur(10px); outline:none; transition:all 0.2s var(--ease);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.03);
}
.lobby-field input:focus {
    border-color:var(--blue-500); background:rgba(255,255,255,0.9);
    box-shadow:0 0 0 4px var(--blue-100), var(--shadow-sm); transform:translateY(-1px);
}
.lobby-field input::placeholder { color:var(--text-tertiary); }

.lobby-cards { display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.action-card {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg); padding: 24px 14px 20px;
    text-align: center; display: flex; flex-direction: column; align-items: center; gap: 8px;
    box-shadow: var(--shadow-glass); transition: all 0.25s var(--ease);
}
.action-card:hover {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 12px 35px 0 rgba(31, 38, 135, 0.18);
    transform: translateY(-3px);
}
.card-icon { width:52px; height:52px; display:flex; align-items:center; justify-content:center; border-radius:var(--radius-md); margin-bottom:2px; transition:transform 0.3s var(--spring); }
.action-card:hover .card-icon { transform:scale(1.1) rotate(-3deg); }
.create-icon { background:linear-gradient(135deg,var(--blue-100),#c7d2fe); color:var(--indigo-600); box-shadow: 0 4px 15px rgba(99,102,241,0.2); }
.join-icon { background:linear-gradient(135deg,#d1fae5,#a7f3d0); color:#059669; box-shadow: 0 4px 15px rgba(16,185,129,0.2); }
.action-card h3 { font-size:15px; font-weight:700; }
.action-card p { font-size:11px; color:var(--text-secondary); line-height:1.3; }
.join-input-row { display:flex; gap:6px; width:100%; margin-top:4px; }
.join-input-row input {
    flex:1; min-width:0; padding:9px 8px; border:1px solid var(--border-glass);
    border-radius:var(--radius-sm); font-family:var(--font); font-size:15px; font-weight:700;
    letter-spacing:3px; text-align:center; color:var(--text-primary); background:rgba(255,255,255,0.7);
    backdrop-filter:blur(8px); outline:none; transition:all 0.2s;
}
.join-input-row input:focus { border-color:var(--blue-500); background:white; box-shadow:0 0 0 3px var(--blue-100); }
.lobby-field.compact { margin-bottom:8px; }
.lobby-field.compact input { padding:9px 12px; font-size:13px; font-weight:500; letter-spacing:0; }

/* ===== Buttons ===== */
.btn {
    display:inline-flex; align-items:center; justify-content:center; gap:6px; padding:10px 20px;
    border:none; border-radius:var(--radius-full); font-family:var(--font); font-size:13px; font-weight:600;
    cursor:pointer; transition:all 0.2s var(--ease); outline:none; white-space:nowrap;
}
.btn:focus-visible { box-shadow:0 0 0 3px var(--blue-100); }
.btn-primary { background:linear-gradient(135deg,var(--blue-500),var(--indigo-500)); color:white; box-shadow: 0 4px 15px rgba(59,130,246,0.35); }
.btn-primary:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(59,130,246,0.5); }
.btn-primary:active { transform:translateY(0) scale(0.97); }
.btn-accent { background:linear-gradient(135deg,#059669,#10b981); color:white; padding:9px 14px; box-shadow: 0 4px 15px rgba(16,185,129,0.3); }
.btn-accent:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(16,185,129,0.45); }
.btn-ghost { background:rgba(255,255,255,0.4); backdrop-filter:blur(8px); color:var(--text-secondary); border:1px solid var(--border-glass); }
.btn-ghost:hover { background:rgba(255,255,255,0.8); color:var(--text-primary); }
.wide-btn { width:100%; margin-top:8px; }

/* ===== Waiting ===== */
.waiting-screen { flex:1; display:flex; align-items:center; justify-content:center; padding:32px 20px; animation:fadeSlideUp 0.3s; }
.waiting-content { text-align:center; max-width:380px; }
.waiting-spinner { width:48px; height:48px; border:3px solid var(--border); border-top-color:var(--blue-500); border-radius:50%; margin:0 auto 20px; animation:spin 0.8s linear infinite; }
.waiting-content h2 { font-size:18px; font-weight:700; margin-bottom:6px; }
.waiting-content > p { font-size:13px; color:var(--text-secondary); margin-bottom:16px; }

.room-credentials {
    background: rgba(255, 255, 255, 0.6); backdrop-filter: var(--glass-blur-sm);
    border: 1px solid var(--border-glass); border-radius: var(--radius-lg);
    padding: 16px 20px; margin-bottom: 16px; text-align: left;
    box-shadow: var(--shadow-glass);
}
.cred-row { display:flex; align-items:center; justify-content:space-between; padding:6px 0; }
.cred-row + .cred-row { border-top:1px solid var(--border); }
.cred-label { font-size:12px; font-weight:600; color:var(--text-secondary); text-transform:uppercase; letter-spacing:0.5px; }
.cred-value { font-size:16px; font-weight:700; color:var(--blue-600); letter-spacing:1px; font-variant-numeric:tabular-nums; }
.room-code-digits { font-size:20px; font-weight:800; letter-spacing:4px; color:var(--blue-600); }

.copy-btn {
    display:flex; align-items:center; justify-content:center; gap:6px; padding:8px 16px;
    border:1px solid var(--border-glass); border-radius:var(--radius-sm);
    background:rgba(255,255,255,0.6); backdrop-filter:blur(8px); color:var(--text-secondary);
    font-family:var(--font); font-size:12px; font-weight:600; cursor:pointer; transition:all 0.15s;
}
.copy-btn.wide { width:100%; margin-bottom:16px; }
.copy-btn:hover { background:rgba(255,255,255,0.9); color:var(--text-primary); }
.copy-btn.copied { border-color:var(--emerald-500); color:var(--emerald-500); }

/* ===== Chat Screen ===== */
.chat-screen { flex:1; display:flex; flex-direction:column; min-height:0; }
.chat-peer-bar {
    display:flex; align-items:center; gap:8px; padding:8px 18px;
    background:rgba(255,255,255,0.72); backdrop-filter:var(--glass-blur);
    -webkit-backdrop-filter:var(--glass-blur);
    border-bottom:1px solid var(--border-glass); flex-shrink:0;
}
.peer-name { font-size:13px; font-weight:600; }
.reset-badge { font-size:11px; font-weight:600; color:var(--indigo-600); background:var(--blue-50); padding:2px 8px; border-radius:var(--radius-full); border:1px solid rgba(99,102,241,0.2); margin-left:auto; }
.typing-indicator { font-size:12px; font-weight:500; color:var(--blue-500); animation:typingFade 1.2s ease-in-out infinite; }

/* ===== Chat Messages with Animated Wallpaper ===== */
.chat-messages {
    flex:1; overflow-y:auto; padding:16px 18px;
    scroll-behavior:smooth; min-height:0;
    position:relative;
    background: linear-gradient(135deg, rgba(219,234,254,0.6) 0%, rgba(237,233,254,0.6) 25%, rgba(209,250,229,0.5) 50%, rgba(254,249,195,0.4) 75%, rgba(219,234,254,0.6) 100%);
    background-size:400% 400%;
    animation:wallpaperShift 20s ease infinite;
}
.chat-messages::before {
    content:''; position:absolute; inset:0; pointer-events:none; z-index:0;
    background-image: radial-gradient(circle at 20% 30%, rgba(99,102,241,0.08) 0%, transparent 50%), radial-gradient(circle at 80% 70%, rgba(59,130,246,0.07) 0%, transparent 50%), radial-gradient(circle at 50% 50%, rgba(16,185,129,0.06) 0%, transparent 50%);
    animation:particlesDrift 15s ease-in-out infinite alternate;
}
.chat-messages > * { position:relative; z-index:1; }
.chat-welcome { text-align:center; padding:32px 16px; }
.welcome-icon { font-size:36px; margin-bottom:8px; animation:welcomeBounce 2s ease-in-out infinite; }
.chat-welcome p { font-size:13px; color:var(--text-secondary); font-weight:500; line-height:1.5; }

/* ===== Message Bubbles ===== */
.msg-row { display:flex; margin-bottom:6px; animation:msgSlide 0.35s var(--spring); position:relative; }
.msg-row.sent { justify-content:flex-end; }
.msg-row.received { justify-content:flex-start; }
.msg-row-wrapper { display:flex; align-items:center; gap:4px; max-width:88%; }
.msg-row.sent .msg-row-wrapper { flex-direction:row-reverse; }

.msg-bubble { max-width:100%; padding:10px 14px; border-radius:var(--radius-lg); word-wrap:break-word; overflow-wrap:break-word; transition:transform 0.15s; position:relative; }
.msg-bubble:hover { transform:scale(1.01); }

/* Sent Glass Bubble */
.msg-row.sent .msg-bubble {
    background: linear-gradient(135deg, rgba(59,130,246,0.92), rgba(99,102,241,0.92));
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    color: var(--bubble-sent-text);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.25);
}

/* Received Glass Bubble */
.msg-row.received .msg-bubble {
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    color: var(--bubble-recv-text);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
}

/* Reply quote inside bubble */
.reply-quote {
    padding:6px 10px; margin-bottom:6px;
    border-radius:6px; font-size:12px; line-height:1.4;
    border-left:3px solid rgba(255,255,255,0.5);
    max-height:48px; overflow:hidden;
}
.msg-row.sent .reply-quote { background:rgba(255,255,255,0.2); color:rgba(255,255,255,0.95); border-left-color:rgba(255,255,255,0.7); }
.msg-row.received .reply-quote { background:rgba(0,0,0,0.05); color:var(--text-secondary); border-left-color:var(--blue-500); }
.reply-quote-name { font-weight:600; font-size:11px; margin-bottom:1px; display:block; }

.msg-text { font-size:14px; line-height:1.5; white-space:pre-wrap; }
.edited-tag { font-size:10px; opacity:0.7; font-style:italic; margin-left:4px; }
.msg-meta { display:flex; align-items:center; justify-content:flex-end; gap:4px; margin-top:3px; }
.msg-time { font-size:10px; font-weight:500; opacity:0.6; }
.msg-row.sent .msg-time { color:rgba(255,255,255,0.75); }
.msg-row.received .msg-time { color:var(--text-tertiary); }

/* Translucent Action Buttons (Reply, Edit, Delete) */
.msg-actions-group { display:flex; align-items:center; gap:2px; opacity:0; transition:all 0.2s var(--ease); flex-shrink:0; }
.msg-row:hover .msg-actions-group,
.msg-row-wrapper:hover .msg-actions-group { opacity:1; }

.msg-action-btn {
    width:26px; height:26px; display:flex; align-items:center; justify-content:center;
    border:none; border-radius:50%;
    background:rgba(255,255,255,0.5); backdrop-filter:blur(6px);
    color:var(--text-tertiary); cursor:pointer;
    transition:all 0.2s var(--ease);
}
.msg-action-btn:hover { background:rgba(255,255,255,0.9); color:var(--text-primary); transform:scale(1.15); }
.msg-action-btn.delete-btn:hover { background:rgba(239,68,68,0.15); color:var(--red-500); }

.sys-msg { text-align:center; margin:10px 0; animation:fadeIn 0.3s; }
.sys-msg span { display:inline-block; background:rgba(255,255,255,0.75); backdrop-filter:blur(10px); border:1px solid var(--border-glass); color:var(--text-secondary); font-size:11px; font-weight:500; padding:4px 14px; border-radius:var(--radius-full); box-shadow:var(--shadow-xs); }

/* ===== Media in Chat ===== */
.media-container { position:relative; border-radius:var(--radius-md); overflow:hidden; margin-bottom:4px; cursor:pointer; }
.media-container img, .media-container video { display:block; max-width:260px; max-height:300px; width:100%; height:auto; border-radius:var(--radius-md); object-fit:cover; transition:transform 0.2s; }
.media-container:hover img, .media-container:hover video { transform:scale(1.02); }
.media-download-btn { position:absolute; bottom:8px; right:8px; width:32px; height:32px; display:flex; align-items:center; justify-content:center; background:rgba(0,0,0,0.55); backdrop-filter:blur(6px); border:none; border-radius:50%; color:white; cursor:pointer; opacity:0; transition:all 0.2s; z-index:2; }
.media-container:hover .media-download-btn { opacity:1; }
.media-download-btn:hover { background:rgba(0,0,0,0.75); transform:scale(1.12); }
.media-play-overlay { position:absolute; top:50%; left:50%; transform:translate(-50%,-50%); width:48px; height:48px; display:flex; align-items:center; justify-content:center; background:rgba(0,0,0,0.5); backdrop-filter:blur(4px); border-radius:50%; color:white; pointer-events:none; }

/* ===== Reply Bar (above input) ===== */
.reply-bar {
    padding:8px 14px; display:flex; align-items:center; justify-content:space-between;
    background:rgba(255,255,255,0.85); backdrop-filter:blur(12px);
    border-top:1px solid var(--border-glass);
    animation:fadeSlideUp 0.2s var(--ease);
}
.reply-bar-content { display:flex; align-items:center; gap:10px; flex:1; min-width:0; }
.reply-bar-line { width:3px; height:32px; background:var(--blue-500); border-radius:2px; flex-shrink:0; }
.reply-bar-text { min-width:0; }
.reply-bar-name { display:block; font-size:11px; font-weight:700; color:var(--blue-500); }
.reply-bar-msg { display:block; font-size:12px; color:var(--text-secondary); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:280px; }
.reply-bar-close { width:28px; height:28px; display:flex; align-items:center; justify-content:center; border:none; border-radius:50%; background:transparent; color:var(--text-tertiary); cursor:pointer; transition:all 0.15s; flex-shrink:0; }
.reply-bar-close:hover { background:rgba(0,0,0,0.06); color:var(--text-primary); }

/* ===== Input Bar ===== */
.input-bar { padding:10px 14px; background:rgba(255,255,255,0.72); backdrop-filter:var(--glass-blur); -webkit-backdrop-filter:var(--glass-blur); border-top:1px solid var(--border-glass); flex-shrink:0; }
.input-bar-inner { display:flex; align-items:center; gap:6px; background:rgba(255,255,255,0.6); backdrop-filter:blur(10px); border-radius:var(--radius-full); padding:4px 4px 4px 6px; border:1px solid var(--border-glass); transition:all 0.25s var(--ease); }
.input-bar-inner:focus-within { border-color:var(--blue-500); background:rgba(255,255,255,0.95); box-shadow:0 0 0 4px var(--blue-100); }
.attach-btn { width:38px; height:38px; display:flex; align-items:center; justify-content:center; border:none; border-radius:50%; background:transparent; color:var(--text-secondary); cursor:pointer; transition:all 0.2s var(--ease); flex-shrink:0; }
.attach-btn:hover { color:var(--blue-500); background:var(--blue-50); transform:rotate(-15deg) scale(1.08); }
.msg-input { flex:1; border:none; outline:none; background:transparent; font-family:var(--font); font-size:14px; color:var(--text-primary); padding:8px 4px; }
.msg-input::placeholder { color:var(--text-tertiary); }
.send-btn { width:38px; height:38px; display:flex; align-items:center; justify-content:center; border:none; border-radius:50%; background:linear-gradient(135deg,var(--blue-500),var(--indigo-500)); color:white; cursor:pointer; transition:all 0.2s var(--ease); flex-shrink:0; box-shadow: 0 4px 12px rgba(59,130,246,0.3); }
.send-btn:disabled { background:var(--border); color:var(--text-tertiary); cursor:default; box-shadow:none; }
.send-btn:not(:disabled):hover { transform:scale(1.08); box-shadow:0 6px 16px rgba(59,130,246,0.45); }
.send-btn:not(:disabled):active { transform:scale(0.92); }

/* ===== Modals (Glassmorphism) ===== */
.edit-modal, .consent-modal, .media-preview-modal, .media-lightbox, .overlay {
    position: absolute; inset: 0; z-index: 65; display: flex; align-items: center; justify-content: center; animation: fadeIn 0.2s;
}
.edit-backdrop, .consent-backdrop, .media-preview-backdrop, .media-lightbox-backdrop {
    position: absolute; inset: 0; background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
}
.edit-card, .consent-card, .overlay-card {
    position: relative; z-index: 1;
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl); padding: 28px 24px 24px; width: 90%; max-width: 380px;
    box-shadow: var(--shadow-xl); animation: scaleIn 0.25s var(--spring);
}
.edit-card h3 { font-size:16px; font-weight:700; margin-bottom:12px; }
.edit-input {
    width:100%; padding:10px 14px; border:1px solid var(--border-glass);
    border-radius:var(--radius-md); font-family:var(--font); font-size:14px;
    color:var(--text-primary); background:rgba(255,255,255,0.7); backdrop-filter:blur(8px);
    outline:none; margin-bottom:16px; transition:border-color 0.2s;
}
.edit-input:focus { border-color:var(--blue-500); background:white; }
.edit-actions { display:flex; gap:10px; justify-content:flex-end; }

/* Consent Card */
.consent-card { text-align:center; max-width:340px; }
.consent-icon { font-size:40px; margin-bottom:10px; }
.consent-card h3 { font-size:17px; font-weight:700; margin-bottom:6px; }
.consent-card p { font-size:13px; color:var(--text-secondary); line-height:1.5; margin-bottom:18px; }
.consent-actions { display:flex; gap:10px; justify-content:center; }

/* RAR Library Reader Glass Screen */
.pdf-viewer-screen {
    position: absolute; inset: 0; top: 57px; z-index: 15;
    display: flex; flex-direction: column;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    animation: fadeIn 0.2s ease-out;
}
.reader-top-bar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px;
    background: rgba(30, 41, 59, 0.8); backdrop-filter: blur(12px);
    color: #f8fafc; border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}
.reader-page-info { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 2px; min-width: 0; flex: 1; margin: 0 10px; }
.reader-page-counter { font-size: 11px; font-weight: 700; color: #38bdf8; text-transform: uppercase; letter-spacing: 0.5px; }
.reader-page-title { font-size: 13px; font-weight: 600; color: #f1f5f9; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px; }
.reader-nav-btn {
    padding: 6px 14px !important; font-size: 12.5px !important; font-weight: 600 !important;
    color: #e2e8f0 !important; border-color: rgba(255,255,255,0.2) !important;
    background: rgba(255,255,255,0.08) !important; backdrop-filter: blur(8px) !important;
    border-radius: var(--radius-full) !important; transition: all 0.2s !important; flex-shrink: 0;
}
.reader-nav-btn:not(:disabled):hover { background: rgba(255,255,255,0.2) !important; color: #ffffff !important; transform: scale(1.05); }
.reader-nav-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.reader-body { flex: 1; overflow-y: auto; display: flex; align-items: center; justify-content: center; background: #090d16; padding: 0; position: relative; }
.reader-image { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; display: block; box-shadow: 0 10px 30px rgba(0,0,0,0.5); transition: opacity 0.18s ease-in-out, transform 0.18s ease-in-out; }
.reader-image.page-flip { opacity: 0; transform: scale(0.97); }

/* Media Preview Modal */
.media-preview-content { position:relative; z-index:1; display:flex; flex-direction:column; height:100%; }
.media-preview-header { display:flex; align-items:center; justify-content:space-between; padding:14px 18px; color:white; }
.media-preview-filename { font-size:14px; font-weight:600; opacity:0.9; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.media-preview-close { width:36px; height:36px; display:flex; align-items:center; justify-content:center; border:none; border-radius:50%; background:rgba(255,255,255,0.15); backdrop-filter:blur(8px); color:white; cursor:pointer; transition:all 0.2s; }
.media-preview-close:hover { background:rgba(255,255,255,0.3); transform:scale(1.1); }
.media-preview-body { flex:1; display:flex; align-items:center; justify-content:center; padding:0 20px; overflow:hidden; }
.media-preview-body img, .media-preview-body video { max-width:100%; max-height:100%; border-radius:var(--radius-md); object-fit:contain; animation:scaleIn 0.3s var(--spring); }
.media-preview-footer { display:flex; align-items:center; justify-content:space-between; padding:16px 20px 24px; color:white; }
.media-preview-size { font-size:12px; font-weight:500; opacity:0.7; }
.media-send-btn { padding:12px 28px; font-size:14px; }

/* Media Lightbox */
.media-lightbox-close { position:absolute; top:14px; right:14px; z-index:2; width:40px; height:40px; display:flex; align-items:center; justify-content:center; border:none; border-radius:50%; background:rgba(255,255,255,0.15); backdrop-filter:blur(8px); color:white; cursor:pointer; transition:all 0.2s; }
.media-lightbox-close:hover { background:rgba(255,255,255,0.3); transform:scale(1.1); }
.media-lightbox-content { position:relative; z-index:1; max-width:95%; max-height:90%; display:flex; align-items:center; justify-content:center; }
.media-lightbox-content img, .media-lightbox-content video { max-width:100%; max-height:85vh; border-radius:var(--radius-md); object-fit:contain; animation:scaleIn 0.3s var(--spring); }

/* Toast */
.toast { position:absolute; bottom:80px; left:50%; transform:translateX(-50%) translateY(20px); padding:10px 22px; background:rgba(15, 23, 42, 0.85); backdrop-filter:blur(16px); color:var(--text-inverse); font-size:13px; font-weight:600; border:1px solid rgba(255,255,255,0.2); border-radius:var(--radius-full); box-shadow:var(--shadow-lg); z-index:100; opacity:0; transition:all 0.3s; pointer-events:none; }
.toast.show { opacity:1; transform:translateX(-50%) translateY(0); }

/* Overlay */
.overlay { position:absolute; inset:0; display:flex; align-items:center; justify-content:center; background:rgba(15, 23, 42, 0.5); backdrop-filter:blur(12px); z-index:50; padding:20px; animation:fadeIn 0.3s; }
.overlay-card { text-align:center; max-width:360px; width:100%; }
.overlay-icon { font-size:40px; margin-bottom:12px; }
.overlay-card h3 { font-size:18px; font-weight:700; margin-bottom:6px; }
.overlay-card p { font-size:13px; color:var(--text-secondary); line-height:1.5; margin-bottom:20px; }
.overlay-actions { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }

/* ===== PDF Card & Preview Styling (Glassmorphism) ===== */
.pdf-preview-box {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 24px 16px; background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px); border: 1px dashed rgba(255, 255, 255, 0.3);
    border-radius: 14px;
}
.pdf-chat-card {
    display: flex; align-items: center; gap: 12px; padding: 10px 14px;
    background: rgba(255, 255, 255, 0.3); backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.45); border-radius: 12px;
    cursor: pointer; transition: all 0.2s ease;
}
.pdf-chat-card:hover {
    background: rgba(255, 255, 255, 0.55); transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}
.pdf-card-icon { font-size: 26px; line-height: 1; }
.pdf-card-info { flex: 1; min-width: 0; }
.pdf-card-name { font-size: 13.5px; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pdf-card-sub { font-size: 11px; color: var(--text-secondary); margin-top: 2px; }
.pdf-card-btn {
    background: rgba(255, 255, 255, 0.5); backdrop-filter: blur(6px); border: 1px solid rgba(255,255,255,0.4);
    color: var(--text-primary); width: 32px; height: 32px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s ease;
}
.pdf-card-btn:hover { background: var(--blue-500); color: white; border-color: var(--blue-500); }

/* ===== Animations ===== */
@keyframes fadeIn { from{opacity:0} to{opacity:1} }
@keyframes fadeSlideUp { from{opacity:0;transform:translateY(16px)} to{opacity:1;transform:translateY(0)} }
@keyframes spin { to{transform:rotate(360deg)} }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }
@keyframes connectedPulse { 0%,100%{box-shadow:0 0 0 3px rgba(16,185,129,0.2)} 50%{box-shadow:0 0 0 6px rgba(16,185,129,0.1)} }
@keyframes msgSlide { from{opacity:0;transform:translateY(12px) scale(0.95)} to{opacity:1;transform:translateY(0) scale(1)} }
@keyframes scaleIn { from{opacity:0;transform:scale(0.9)} to{opacity:1;transform:scale(1)} }
@keyframes typingFade { 0%,100%{opacity:1} 50%{opacity:0.3} }
@keyframes logoFloat { 0%,100%{transform:translateY(0) rotate(0)} 50%{transform:translateY(-2px) rotate(2deg)} }
@keyframes heroGlow { 0%{box-shadow:0 0 0 0 rgba(99,102,241,0)} 100%{box-shadow:0 0 30px 8px rgba(99,102,241,0.2)} }
@keyframes welcomeBounce { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }
@keyframes wallpaperShift { 0%{background-position:0% 50%} 25%{background-position:100% 0%} 50%{background-position:100% 100%} 75%{background-position:0% 100%} 100%{background-position:0% 50%} }
@keyframes particlesDrift { 0%{transform:translate(0,0) scale(1)} 50%{transform:translate(10px,-15px) scale(1.05)} 100%{transform:translate(-5px,5px) scale(1.02)} }

/* ===== Scrollbar ===== */
.chat-messages::-webkit-scrollbar { width:4px; }
.chat-messages::-webkit-scrollbar-track { background:transparent; }
.chat-messages::-webkit-scrollbar-thumb { background:rgba(203, 213, 225, 0.6); border-radius:10px; }

/* ===== Responsive ===== */
@media (max-width:480px) {
    .lobby-cards { grid-template-columns:1fr; }
    .lobby-hero h2 { font-size:20px; }
    .room-code-digits { font-size:26px; letter-spacing:4px; }
    .msg-bubble { max-width:85%; }
    .media-container img, .media-container video { max-width:220px; }
    .reply-bar-msg { max-width:180px; }
}

@supports (padding-bottom:env(safe-area-inset-bottom)) {
    .input-bar { padding-bottom:calc(10px + env(safe-area-inset-bottom)); }
}