/* ─── Themes ──────────────────────────────────────────── */
:root,
[data-theme="light"] {
    --primary: #4f6ef7; --primary-dark: #3b54d4; --primary-light: #eef1ff;
    --bg: #f0f2f5; --sidebar-bg: #fff; --chat-bg: #f7f8fa; --msg-theirs: #fff;
    --text: #1a1a2e; --text-secondary: #6b7280; --border: #e5e7eb;
    --success: #10b981; --danger: #ef4444; --warning: #f59e0b;
    --input-bg: #f0f2f5; --hover-bg: #f3f4f6;
    --admin-bg: #fffbeb; --admin-border: #fde68a; --admin-text: #92400e; --admin-hover: #fef3c7;
    --auth-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --radius: 12px; --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 30px rgba(0,0,0,.1);
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --primary: #6366f1; --primary-dark: #4f46e5; --primary-light: #1e1b4b;
    --bg: #0f172a; --sidebar-bg: #1e293b; --chat-bg: #0f172a; --msg-theirs: #1e293b;
    --text: #e2e8f0; --text-secondary: #94a3b8; --border: #334155;
    --success: #34d399; --danger: #f87171; --warning: #fbbf24;
    --input-bg: #1e293b; --hover-bg: #334155;
    --admin-bg: #1e1b4b; --admin-border: #4f46e5; --admin-text: #c7d2fe; --admin-hover: #312e81;
    --auth-gradient: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
}

[data-theme="ocean"] {
    --primary: #0ea5e9; --primary-dark: #0284c7; --primary-light: #e0f2fe;
    --bg: #f0f9ff; --sidebar-bg: #fff; --chat-bg: #f0f9ff; --msg-theirs: #fff;
    --text: #0c4a6e; --text-secondary: #0369a1; --border: #bae6fd;
    --success: #14b8a6; --danger: #f43f5e; --warning: #eab308;
    --input-bg: #e0f2fe; --hover-bg: #bae6fd;
    --admin-bg: #e0f2fe; --admin-border: #7dd3fc; --admin-text: #0c4a6e; --admin-hover: #bae6fd;
    --auth-gradient: linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
}

[data-theme="forest"] {
    --primary: #16a34a; --primary-dark: #15803d; --primary-light: #dcfce7;
    --bg: #f0fdf4; --sidebar-bg: #fff; --chat-bg: #f0fdf4; --msg-theirs: #fff;
    --text: #14532d; --text-secondary: #166534; --border: #bbf7d0;
    --success: #22c55e; --danger: #ef4444; --warning: #f59e0b;
    --input-bg: #dcfce7; --hover-bg: #bbf7d0;
    --admin-bg: #dcfce7; --admin-border: #86efac; --admin-text: #14532d; --admin-hover: #bbf7d0;
    --auth-gradient: linear-gradient(135deg, #16a34a 0%, #14532d 100%);
}

[data-theme="purple"] {
    --primary: #a855f7; --primary-dark: #9333ea; --primary-light: #f3e8ff;
    --bg: #faf5ff; --sidebar-bg: #fff; --chat-bg: #faf5ff; --msg-theirs: #fff;
    --text: #3b0764; --text-secondary: #6b21a8; --border: #e9d5ff;
    --success: #10b981; --danger: #f43f5e; --warning: #f59e0b;
    --input-bg: #f3e8ff; --hover-bg: #e9d5ff;
    --admin-bg: #f3e8ff; --admin-border: #d8b4fe; --admin-text: #3b0764; --admin-hover: #e9d5ff;
    --auth-gradient: linear-gradient(135deg, #a855f7 0%, #6b21a8 100%);
}

[data-theme="sunset"] {
    --primary: #f97316; --primary-dark: #ea580c; --primary-light: #fff7ed;
    --bg: #fff7ed; --sidebar-bg: #fff; --chat-bg: #fff7ed; --msg-theirs: #fff;
    --text: #431407; --text-secondary: #9a3412; --border: #fed7aa;
    --success: #22c55e; --danger: #dc2626; --warning: #eab308;
    --input-bg: #ffedd5; --hover-bg: #fed7aa;
    --admin-bg: #ffedd5; --admin-border: #fdba74; --admin-text: #431407; --admin-hover: #fed7aa;
    --auth-gradient: linear-gradient(135deg, #f97316 0%, #c2410c 100%);
}

/* ─── Reset ──────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* ─── Buttons ────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition);gap:6px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover:not(:disabled){background:var(--primary-dark)}
.btn-outline{background:transparent;color:var(--text-secondary);border:1px solid var(--border)}
.btn-outline:hover{background:var(--hover-bg);color:var(--text)}
.btn-small{padding:5px 10px;font-size:12px;border-radius:6px}
.btn-block{width:100%}
.btn-accept{background:var(--success);color:#fff}
.btn-accept:hover{background:#059669}
.btn-reject{background:var(--hover-bg);color:var(--text-secondary)}
.btn-reject:hover{background:#fee2e2;color:var(--danger)}

/* ─── Auth ───────────────────────────────────────────── */
.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:#0f172a}
.auth-container{width:100%;max-width:400px;padding:20px}
.auth-card{background:#1e293b;border-radius:16px;padding:36px 32px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.auth-header{text-align:center;margin-bottom:28px}
.auth-header h1{font-size:26px;margin-bottom:6px;color:#e2e8f0}
.auth-header p{font-size:14px;color:#94a3b8}
.auth-tabs{display:flex;border-bottom:2px solid #334155;margin-bottom:24px}
.tab{flex:1;text-align:center;padding:10px 0;font-weight:600;color:#94a3b8;font-size:15px;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all var(--transition)}
.tab:hover{color:var(--primary);text-decoration:none}
.tab.active{color:var(--primary);border-bottom-color:var(--primary)}
.auth-form .form-group{margin-bottom:16px}
.auth-form label{display:block;font-size:13px;font-weight:600;margin-bottom:5px;color:#cbd5e1}
.auth-form input[type="text"],.auth-form input[type="password"]{width:100%;padding:10px 14px;border:1.5px solid #334155;border-radius:var(--radius-sm);font-size:15px;outline:none;transition:border var(--transition);background:#0f172a;color:#e2e8f0}
.auth-form input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.auth-form .btn{margin-top:8px;padding:12px;font-size:16px}
.captcha-group label{color:#fbbf24 !important}
.captcha-group input{border-color:#fbbf24 !important;font-size:18px;letter-spacing:2px}
.change-pwd-form input{width:100% !important;padding:8px 10px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:13px;background:var(--input-bg);color:var(--text);outline:none}
.change-pwd-form input:focus{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light)}
.change-pwd-form .form-group{margin-bottom:8px}

/* ─── Flash ──────────────────────────────────────────── */
.flash-container{margin-bottom:16px}
.flash{padding:10px 14px;border-radius:var(--radius-sm);font-size:13px;margin-bottom:8px;animation:slideDown .3s ease}
.flash-success{background:#d1fae5;color:#065f46;border:1px solid #a7f3d0}
.flash-danger{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}
.flash-info{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}
@keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}

/* ─── Layout ─────────────────────────────────────────── */
.chat-page{display:flex;height:100vh;overflow:hidden}
.sidebar{width:340px;min-width:260px;max-width:45%;background:var(--sidebar-bg);border-right:2px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;overflow:hidden;resize:horizontal}
.sidebar.collapsed{width:56px;min-width:56px;max-width:56px}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:14px 14px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-header-actions{display:flex;align-items:center;gap:6px}
.current-user{display:flex;align-items:center;gap:10px;overflow:hidden}
.current-user .avatar{font-size:26px;flex-shrink:0}
.current-user .username{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;transition:opacity .2s ease,width .2s ease}
.user-id-badge{display:inline-block;background:var(--primary);color:#fff;font-size:11px;padding:2px 8px;border-radius:10px;font-weight:700;margin-left:2px}
.sidebar.collapsed .current-user .username{opacity:0;width:0}
.sidebar.collapsed .sidebar-header-actions .btn-outline,.sidebar.collapsed .sidebar-header-actions .btn-settings{display:none}
.sidebar.collapsed .sidebar-header-actions .btn-icon{margin:0 auto}
.sidebar.collapsed .sidebar-tabs{display:none}
.sidebar.collapsed .sidebar-panel{display:none}
.sidebar.collapsed .sidebar-header{padding:14px 10px;justify-content:center}
.sidebar.collapsed .current-user{justify-content:center}

.btn-icon{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-size:18px;cursor:pointer;transition:all var(--transition);flex-shrink:0;line-height:1}
.btn-icon:hover{background:var(--hover-bg);color:var(--text)}
.btn-settings{background:transparent;color:var(--text-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;cursor:pointer;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;transition:all var(--transition);flex-shrink:0;padding:0}
.btn-settings:hover{background:var(--hover-bg);color:var(--text)}

/* ─── Settings Panel ─────────────────────────────────── */
.settings-panel{background:var(--sidebar-bg);border-bottom:2px solid var(--primary);max-height:50%;overflow-y:auto;flex-shrink:0}
.settings-panel.hidden{display:none}
.settings-panel-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;font-weight:700;font-size:13px;border-bottom:1px solid var(--border);color:var(--primary)}
.settings-section{padding:10px 14px;border-bottom:1px solid var(--border)}
.settings-section:last-child{border-bottom:none}
.settings-label{font-size:12px;font-weight:700;color:var(--text-secondary);margin-bottom:8px;text-transform:uppercase}
.theme-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.theme-option{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 4px;border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);background:var(--sidebar-bg)}
.theme-option:hover{border-color:var(--primary)}
.theme-option.active{border-color:var(--primary);background:var(--primary-light)}
.theme-swatch{width:32px;height:32px;border-radius:50%;border:2px solid #e5e7eb}
.theme-swatch.light{background:linear-gradient(135deg,#667eea,#764ba2)}
.theme-swatch.dark{background:linear-gradient(135deg,#1e293b,#0f172a)}
.theme-swatch.ocean{background:linear-gradient(135deg,#0ea5e9,#0369a1)}
.theme-swatch.forest{background:linear-gradient(135deg,#16a34a,#14532d)}
.theme-swatch.purple{background:linear-gradient(135deg,#a855f7,#6b21a8)}
.theme-swatch.sunset{background:linear-gradient(135deg,#f97316,#c2410c)}
.theme-name{font-size:11px;color:var(--text-secondary);font-weight:600}
.lang-options{display:flex;gap:8px}
.lang-option{padding:6px 16px;border:2px solid var(--border);border-radius:20px;cursor:pointer;font-size:13px;font-weight:600;color:var(--text-secondary);transition:all var(--transition);background:var(--sidebar-bg)}
.lang-option:hover{border-color:var(--primary)}
.lang-option.active{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}

/* ─── Sidebar Tabs ───────────────────────────────────── */
.sidebar-tabs{display:flex;border-bottom:2px solid var(--border)}
.s-tab{flex:1;padding:10px 0;border:none;background:transparent;font-size:13px;font-weight:600;color:var(--text-secondary);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all var(--transition)}
.s-tab:hover{color:var(--primary)}
.s-tab.active{color:var(--primary);border-bottom-color:var(--primary)}
.sidebar-panel{flex:1;display:flex;flex-direction:column;overflow:hidden}
.sidebar-panel.hidden{display:none}
.search-box{padding:10px 14px}
.search-box input{width:100%;padding:9px 14px;border:1.5px solid var(--border);border-radius:20px;font-size:14px;outline:none;background:var(--input-bg);color:var(--text);transition:all var(--transition)}
.search-box input:focus{border-color:var(--primary);background:var(--sidebar-bg)}
.contact-list{flex:1;overflow-y:auto}
.contact-list .loading-text{text-align:center;color:var(--text-secondary);padding:30px;font-size:13px}

/* ─── Contacts ───────────────────────────────────────── */
.contact-item{display:flex;align-items:center;gap:12px;padding:14px 20px;cursor:pointer;transition:background var(--transition);border-bottom:1px solid var(--border)}
.contact-item:hover{background:var(--primary-light)}
.contact-item.active{background:var(--primary-light);border-left:3px solid var(--primary)}
.contact-item .avatar{font-size:32px;flex-shrink:0}
.contact-item .contact-info{flex:1;min-width:0}
.contact-item .contact-name{font-weight:600;font-size:14px}
.contact-item .contact-preview{font-size:12px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.contact-actions{flex-shrink:0;display:flex;align-items:center}
.btn-delete-friend{width:20px;height:20px;border:none;background:transparent;color:#ccc;font-size:14px;cursor:pointer;border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:all .15s;line-height:1;padding:0}
.contact-item:hover .btn-delete-friend{opacity:1}
.btn-delete-friend:hover{background:var(--danger);color:#fff}
.contact-meta{text-align:right;flex-shrink:0}
.online-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--success);margin-bottom:4px}
.offline-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#ccc;margin-bottom:4px}
.unread-badge{display:inline-block;background:var(--danger);color:#fff;font-size:11px;font-weight:700;padding:2px 7px;border-radius:10px;min-width:20px;text-align:center}

/* ─── Search ─────────────────────────────────────────── */
.search-results{display:none;background:var(--sidebar-bg);border:1px solid var(--border);border-radius:var(--radius-sm);margin-top:6px;max-height:240px;overflow-y:auto;box-shadow:var(--shadow)}
.search-results.show{display:block}
.search-result-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--border)}
.search-result-item:last-child{border-bottom:none}
.search-result-item .avatar{font-size:26px;flex-shrink:0}
.search-result-item .contact-name{flex:1;font-weight:600;font-size:14px}
.search-results .loading-text{text-align:center;padding:20px;font-size:13px;color:var(--text-secondary)}

/* ─── Friend Requests ────────────────────────────────── */
.friend-requests-section{border-top:1px solid var(--border);padding:12px 14px;flex:1;overflow-y:auto}
.section-title{font-size:13px;font-weight:700;color:var(--text-secondary);margin-bottom:10px;display:flex;align-items:center;gap:8px}
.badge{display:inline-block;background:var(--danger);color:#fff;font-size:11px;font-weight:700;padding:1px 7px;border-radius:10px;min-width:18px;text-align:center}
.badge.hidden{display:none}
.request-item{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--border)}
.request-item .avatar{font-size:28px;flex-shrink:0}
.request-item .contact-name{flex:1;font-weight:600;font-size:14px}
.request-actions{display:flex;gap:6px;flex-shrink:0}
.request-list .loading-text{text-align:center;padding:20px;font-size:13px;color:var(--text-secondary)}

/* ─── Chat ───────────────────────────────────────────── */
.chat-main{flex:1;display:flex;flex-direction:column;background:var(--chat-bg);min-width:320px;position:relative;overflow:hidden}
.chat-empty{flex:1;display:flex;align-items:center;justify-content:center;min-height:0}
.empty-content{text-align:center}
.empty-icon{font-size:64px;display:block;margin-bottom:16px}
.empty-content h2{font-size:20px;margin-bottom:6px;color:var(--text)}
.empty-content p{color:var(--text-secondary);font-size:14px}
.empty-hint{margin-top:12px;font-size:12px!important;color:var(--text-secondary)!important;opacity:.6}
.chat-window{flex:1;display:flex;flex-direction:column;min-height:0}
.chat-window.hidden,.hidden{display:none!important}
.chat-header{display:flex;align-items:center;padding:14px 16px;background:var(--sidebar-bg);border-bottom:1px solid var(--border)}
#expandSidebarBtn{display:none}
.sidebar.collapsed~.chat-main #expandSidebarBtn{display:inline-flex}
.chat-contact-info{display:flex;align-items:center;gap:12px}
.chat-contact-info .avatar{font-size:34px}
.chat-contact-name{font-weight:700;font-size:16px}
.chat-contact-status{font-size:12px}
.messages-container{flex:1;overflow-y:auto;padding:20px 24px;min-height:0}
.messages-list{display:flex;flex-direction:column;gap:4px}
.message-row{display:flex;margin-bottom:8px;animation:msgIn .25s ease}
.message-row.mine{justify-content:flex-end}
@keyframes msgIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.message-wrapper{max-width:75%}
.message-bubble{padding:10px 16px;border-radius:18px;font-size:14px;line-height:1.55;overflow-wrap:break-word;white-space:pre-wrap}
.message-row.mine .message-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.message-row.theirs .message-bubble{background:var(--msg-theirs);border-bottom-left-radius:4px;box-shadow:var(--shadow)}
.message-time{font-size:11px;margin-top:2px;opacity:.7}
.message-row.mine .message-time{text-align:right}
.typing-indicator{padding:6px 24px;font-size:12px;color:var(--text-secondary);font-style:italic}
.message-input-area{padding:14px 24px;background:var(--sidebar-bg);border-top:1px solid var(--border)}
.message-input-area form{display:flex;gap:10px}
.message-input-area input{flex:1;padding:11px 18px;border:1.5px solid var(--border);border-radius:24px;font-size:14px;outline:none;color:var(--text);background:var(--input-bg);transition:border var(--transition)}
.message-input-area input:focus{border-color:var(--primary)}
.message-input-area .btn{border-radius:24px;padding:11px 24px}

/* ─── Avatar ─────────────────────────────────────────── */
.avatar-upload-wrapper{position:relative;cursor:pointer;flex-shrink:0}
.avatar-upload-wrapper .avatar{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;overflow:hidden;font-size:26px}
.avatar-upload-wrapper .avatar.has-img{font-size:0}
.avatar-img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.avatar-overlay{position:absolute;inset:0;border-radius:50%;background:rgba(0,0,0,.4);color:#fff;font-size:14px;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .2s}
.avatar-upload-wrapper:hover .avatar-overlay{opacity:1}
.contact-item .avatar,.search-result-item .avatar,.request-item .avatar{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;overflow:hidden;font-size:26px;flex-shrink:0}
.contact-item .avatar-img,.search-result-item .avatar-img,.request-item .avatar-img{width:100%;height:100%;object-fit:cover}
.chat-contact-info .avatar{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;overflow:hidden;font-size:34px;flex-shrink:0}

/* ─── File ───────────────────────────────────────────── */
.btn-icon-attach{border:1px solid var(--border);background:transparent;width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:16px;flex-shrink:0;color:var(--text-secondary)}
.btn-icon-attach:hover{background:var(--hover-bg)}
.btn-icon-sm{width:26px;height:26px;font-size:12px}
.file-preview{display:flex;align-items:center;gap:10px;padding:6px 14px;margin-top:6px;background:var(--primary-light);border-radius:12px;font-size:12px;color:var(--primary-dark)}
.file-preview.hidden{display:none}
.file-preview .btn-icon-sm{margin-left:auto}
.file-msg{display:inline-flex;align-items:center;gap:6px;color:inherit;text-decoration:none;font-size:13px}
.message-row.mine .file-msg{color:#fff}
.file-size{font-size:11px;opacity:.6}
.file-delete-in{font-size:10px;opacity:.5;margin-left:4px;font-style:italic}
.upload-progress{padding:8px 14px;margin-top:6px;background:var(--input-bg);border-radius:10px;font-size:12px}
.upload-progress.hidden{display:none}
.upload-progress-header{display:flex;justify-content:space-between;margin-bottom:5px;color:var(--text-secondary)}
.upload-progress-bar{height:6px;background:var(--border);border-radius:3px;overflow:hidden}
.upload-progress-fill{height:100%;width:0;background:var(--primary);border-radius:3px;transition:width .2s ease}

/* ─── Admin ──────────────────────────────────────────── */
.btn-admin{background:var(--danger);color:#fff;border:none}
.btn-admin:hover{background:#dc2626;color:#fff}
.admin-panel{background:var(--admin-bg);border-bottom:2px solid var(--admin-border);max-height:45%;overflow-y:auto;flex-shrink:0}
.admin-panel.hidden{display:none}
.admin-panel-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;font-weight:700;font-size:13px;border-bottom:1px solid var(--admin-border);color:var(--admin-text)}
.admin-status{padding:8px 10px;border-bottom:1px solid var(--admin-border)}
.status-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.status-item{background:var(--sidebar-bg);border-radius:6px;padding:6px 8px;text-align:center}
.status-item span{display:block;font-size:10px;color:var(--text-secondary);margin-bottom:2px}
.status-item b{font-size:12px;font-weight:700;color:var(--text)}
.admin-users-list{padding:6px 0}
.admin-user-item{display:flex;align-items:center;gap:10px;padding:8px 14px;cursor:pointer;transition:background .15s;font-size:13px}
.admin-user-item:hover{background:var(--admin-hover)}
.admin-user-item.selected{background:var(--admin-border);font-weight:700}
.admin-hint{padding:10px 14px;font-size:11px;color:var(--admin-text);border-top:1px dashed var(--admin-border);margin-top:6px}
.admin-convo-header{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;border-bottom:1px solid var(--admin-border);font-size:13px;font-weight:700;color:var(--admin-text)}
.admin-messages{padding:10px;max-height:300px;overflow-y:auto}
.admin-msg-sender{font-size:11px;color:var(--text-secondary);margin-bottom:2px;font-weight:600}

/* ─── Responsive ─────────────────────────────────────── */
@media(max-width:1000px){
    .sidebar{width:260px;min-width:260px;max-width:38%}
    .chat-main{min-width:320px}
    .message-wrapper{max-width:82%}
}
@media(max-width:750px){
    .sidebar{width:220px;min-width:220px;max-width:42%}
    .chat-main{min-width:260px}
    .messages-container{padding:12px 12px}
    .message-wrapper{max-width:88%}
    .chat-header{padding:10px 12px}
    .chat-contact-info .avatar{font-size:26px}
    .chat-contact-name{font-size:14px}
    .message-input-area{padding:8px 10px}
    .message-input-area form{gap:6px}
    .message-input-area input{padding:10px 14px;font-size:13px}
    .message-input-area .btn{padding:10px 14px;font-size:13px}
    .contact-item{padding:8px 10px;gap:8px}
    .contact-item .avatar{font-size:22px}
    .contact-item .contact-name{font-size:12px}
    .sidebar-header{padding:10px 10px}
    .current-user .avatar{font-size:22px}
    .current-user .username{font-size:13px}
    .s-tab{font-size:12px;padding:8px 0}
    .search-box input{font-size:12px;padding:7px 10px}
    .message-bubble{font-size:13px;padding:8px 12px}
    .btn-small{padding:4px 8px;font-size:11px}
    .btn-icon{width:32px;height:32px;font-size:16px}
    .btn-settings{width:32px;height:32px;font-size:13px}
    .theme-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:500px){
    .sidebar{width:150px;min-width:150px;max-width:45%}
    .chat-main{min-width:180px}
    .messages-container{padding:8px 8px}
    .message-wrapper{max-width:94%}
    .message-bubble{padding:8px 12px;font-size:12px}
    .message-input-area input{padding:8px 12px;font-size:12px}
    .message-input-area .btn{padding:8px 12px;font-size:12px}
    .chat-header{padding:8px 10px}
    .chat-contact-info .avatar{font-size:22px}
    .chat-contact-name{font-size:13px}
    .contact-item{padding:6px 8px;gap:6px}
    .contact-item .avatar{font-size:20px}
    .contact-name{font-size:11px}
    .sidebar-header{padding:8px 8px}
    .current-user .avatar{font-size:20px}
    .current-user .username{font-size:12px}
    .s-tab{font-size:11px;padding:6px 0}
    .btn-icon{width:28px;height:28px;font-size:14px}
    .btn-settings{width:28px;height:28px;font-size:12px}
}

/* ─── Admin Entry ────────────────────────────────────── */
.admin-entry{position:fixed;bottom:20px;right:20px;z-index:999}
.admin-entry a{font-size:12px;color:#64748b;text-decoration:none;opacity:.4;transition:opacity .2s}
.admin-entry a:hover{opacity:1;color:var(--primary)}

/* ─── Admin Dashboard ────────────────────────────────── */
.admin-dashboard{background:#0f172a;min-height:100vh;color:#e2e8f0;font-family:-apple-system,BlinkMacSystemFont,sans-serif}
.admin-topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:#1e293b;border-bottom:1px solid #334155;font-weight:700;font-size:16px}
.admin-dash-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:14px;padding:14px;max-width:100%;margin:0 auto}
.admin-dash-card{background:#1e293b;border-radius:12px;padding:14px;border:1px solid #334155;min-width:0;overflow-x:auto}
.admin-dash-card h3{font-size:14px;margin:0 0 10px 0;color:#f1f5f9}
@media(max-width:800px){.admin-dash-grid{grid-template-columns:1fr}}
.admin-dash-card .status-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px}
.admin-dash-card .status-item{background:#0f172a;padding:10px;border-radius:8px;text-align:center}
.admin-dash-card .status-item span{display:block;font-size:11px;color:#94a3b8;margin-bottom:4px}
.admin-dash-card .status-item b{font-size:16px;font-weight:700;color:#e2e8f0}
.admin-user-search{margin-bottom:10px}
.admin-user-search input{width:100%;padding:8px 12px;background:#0f172a;border:1px solid #334155;border-radius:8px;color:#e2e8f0;font-size:13px;outline:none}
.admin-user-search input:focus{border-color:var(--primary)}
.admin-user-table-wrap{max-height:400px;overflow-y:auto}
.admin-user-table{width:100%;border-collapse:collapse;font-size:12px}
.admin-user-table th{background:#0f172a;padding:8px 6px;text-align:left;font-size:11px;color:#94a3b8;position:sticky;top:0}
.admin-user-table td{padding:6px;border-bottom:1px solid #1e293b}
.admin-user-table .btn-small{padding:3px 8px;font-size:11px;margin:1px}
.admin-messages{padding:10px;max-height:400px;overflow-y:auto}
.forum-review-item{background:#0f172a;padding:12px;border-radius:8px;margin-bottom:10px;border:1px solid #334155}

/* ─── Groups Tab ─────────────────────────────────────── */
.group-item{display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;transition:background .15s;border-bottom:1px solid var(--border)}
.group-item:hover{background:var(--hover-bg)}
.group-item .group-avatar{width:40px;height:40px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;color:var(--primary);flex-shrink:0}
.group-info{flex:1;min-width:0}
.group-name{font-weight:700;font-size:14px}
.group-meta{font-size:11px;color:var(--text-secondary)}
.group-actions{padding:10px 14px;border-top:1px solid var(--border)}
.group-actions input{width:100%;padding:8px 10px;margin:4px 0;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;background:var(--input-bg);color:var(--text);outline:none}
.group-actions .btn{margin-top:6px;width:100%}

/* ─── Forum Tab ──────────────────────────────────────── */
.forum-tab-btn{flex:1;text-align:center;padding:8px 0;font-weight:600;font-size:12px;border:none;border-bottom:2px solid transparent;background:transparent;color:var(--text-secondary);cursor:pointer;transition:all var(--transition)}
.forum-tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}
.forum-tab-btn:hover{color:var(--primary)}
.forum-post-item{background:var(--chat-bg);border-radius:12px;margin-bottom:10px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border)}
.forum-post-header{display:flex;align-items:center;gap:10px;padding:10px 12px 6px}
.forum-post-avatar{width:32px;height:32px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.forum-post-user{font-weight:700;font-size:13px;color:var(--text)}
.forum-post-time{font-size:11px;color:var(--text-secondary);margin-left:auto}
.forum-post-body{padding:0 12px 12px}
.forum-post-content{font-size:14px;line-height:1.6;white-space:pre-wrap;color:var(--text)}
.forum-post-content.folded{max-height:100px;overflow:hidden;position:relative}
.forum-post-content.folded::after{content:'';position:absolute;bottom:0;left:0;right:0;height:40px;background:linear-gradient(transparent,var(--chat-bg))}
.forum-post-toggle{color:var(--primary);font-size:12px;cursor:pointer;font-weight:600;margin-top:4px;display:inline-block;user-select:none}
.forum-post-images{display:grid;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:4px;margin-top:8px}
.forum-post-images img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:6px;cursor:pointer}
.forum-post-status{font-size:11px;display:inline-block;padding:2px 8px;border-radius:10px;font-weight:600}
.forum-post-status.pending{background:#fef3c7;color:#92400e}
.forum-post-status.approved{background:#d1fae5;color:#065f46}
.forum-post-status.rejected{background:#fee2e2;color:#991b1b}
.forum-create{padding:8px 0}
.forum-create textarea{width:100%;min-height:100px;padding:10px;border:1px solid var(--border);border-radius:10px;font-size:14px;background:var(--input-bg);color:var(--text);resize:vertical;outline:none;font-family:inherit;line-height:1.5}
.forum-create textarea:focus{border-color:var(--primary)}
.forum-create .char-count{font-size:11px;color:var(--text-secondary);text-align:right;margin-top:2px}
.forum-create .forum-imgs-preview{display:flex;flex-wrap:wrap;gap:4px;margin:6px 0}
.forum-create .forum-imgs-preview img{width:60px;height:60px;object-fit:cover;border-radius:6px;border:1px solid var(--border)}

/* ─── Modal ─────────────────────────────────────────── */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:999;display:flex;align-items:center;justify-content:center}
.modal-overlay.hidden{display:none}
.modal-card{background:var(--sidebar-bg);border-radius:12px;width:90%;max-width:380px;max-height:80vh;overflow:hidden;box-shadow:0 8px 32px rgba(0,0,0,.4)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:14px;font-weight:700;font-size:15px;border-bottom:1px solid var(--border)}
.modal-body{padding:14px;overflow-y:auto;max-height:50vh}
.modal-input{width:100%;padding:10px;border:1px solid var(--border);border-radius:8px;font-size:14px;background:var(--input-bg);color:var(--text);outline:none}
.modal-friend-item{display:flex;align-items:center;gap:8px;padding:8px;border-radius:8px;cursor:pointer;font-size:13px}
.modal-friend-item:hover{background:var(--hover-bg)}
.modal-friend-item input[type=checkbox]{margin-right:6px}

/* ─── Image Lightbox ────────────────────────────────── */
.image-lightbox{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:1000;display:flex;align-items:center;justify-content:center;cursor:pointer}
.image-lightbox.hidden{display:none}
.image-lightbox img{max-width:95%;max-height:95%;object-fit:contain;border-radius:8px}

/* ─── Quote Bar ─────────────────────────────────────── */
.quote-bar{display:flex;align-items:center;gap:8px;padding:6px 14px;background:var(--primary-light);border-top:1px solid var(--border);font-size:12px;color:var(--text-secondary)}
.quote-bar.hidden{display:none}
.quote-bar-text{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ─── Mobile Sidebar ────────────────────────────────── */
@media(max-width:768px){
    /* Remove border frame on mobile */
    body::before { display:none; }

    /* Sidebar: 85% slide-over drawer */
    .sidebar{
        position:fixed !important;
        top:0;left:0;bottom:0;
        width:85% !important;
        min-width:unset !important;
        max-width:320px !important;
        z-index:200;
        transition:transform .25s cubic-bezier(.4,0,.2,1);
        box-shadow:4px 0 24px rgba(0,0,0,.3);
        resize:none;
    }
    .sidebar.mobile-hidden{transform:translateX(-100%)}

    /* Backdrop overlay */
    .sidebar-backdrop{
        position:fixed;inset:0;
        background:rgba(0,0,0,.45);
        z-index:199;
        opacity:1;
        transition:opacity .25s;
    }
    .sidebar-backdrop.hidden{opacity:0;pointer-events:none}

    /* Chat area */
    .chat-main{min-width:100%!important}

    /* Hamburger in chat header */
    .sidebar-hamburger{
        display:flex !important;
        align-items:center;justify-content:center;
        width:38px;height:38px;
        background:transparent;
        color:var(--text-secondary);
        border:none;border-radius:8px;
        font-size:22px;cursor:pointer;
        margin-right:8px;flex-shrink:0;
        -webkit-tap-highlight-color:transparent;
    }
    .sidebar-hamburger:active{background:var(--hover-bg)}
    .mobile-toggle{display:none!important}

    /* Touch-friendly sizing */
    .chat-header{padding:10px 12px;min-height:52px}
    .chat-contact-info .avatar{font-size:32px;width:36px;height:36px}
    .chat-contact-name{font-size:15px}
    .message-input-area{padding:8px 10px}
    .message-input-area form{gap:6px}
    .message-input-area input{padding:11px 14px;font-size:15px}
    .message-input-area .btn{padding:11px 14px;font-size:14px;min-width:48px}
    .btn-icon-attach{width:40px;height:40px;font-size:18px}
    .messages-container{padding:10px 10px}
    .message-wrapper{max-width:88%}
    .message-bubble{font-size:14px;padding:10px 14px;line-height:1.5}

    /* Sidebar internals */
    .sidebar-header{padding:12px 14px}
    .current-user .avatar{font-size:28px}
    .current-user .username{font-size:15px}
    .contact-item{padding:12px 14px;gap:10px}
    .contact-item .avatar{font-size:30px;width:40px;height:40px}
    .contact-item .contact-name{font-size:14px}
    .search-box{padding:10px 14px}
    .search-box input{font-size:14px;padding:10px 14px}
    .btn-delete-friend{opacity:.6;width:28px;height:28px;font-size:16px}

    /* Forum detail: fixed full-screen on mobile */
    .forum-detail{
        position:fixed !important;
        inset:0 !important;
        z-index:150 !important;
    }
    .forum-detail-body{padding:14px !important}
    .forum-detail-header{padding:10px 14px}
    .forum-detail-meta{padding:10px !important}

    /* Auth pages */
    .auth-container{padding:12px}
    .auth-card{padding:24px 20px}

    /* Admin */
    .admin-dash-grid{grid-template-columns:1fr;padding:8px}
    .admin-dash-card{padding:12px}
}

/* Small phones */
@media(max-width:400px){
    .sidebar{width:90% !important;max-width:unset !important}
    .message-wrapper{max-width:92%}
    .message-bubble{font-size:13px;padding:8px 12px}
}

/* ─── Forum Discourse Style ─────────────────────────── */
.forum-tab-btn{flex:1;text-align:center;padding:8px 0;font-weight:600;font-size:12px;border:none;border-bottom:2px solid transparent;background:transparent;color:var(--text-secondary);cursor:pointer;transition:all var(--transition)}
.forum-tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}
.forum-list-item{display:flex;align-items:center;gap:10px;padding:10px 8px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s}
.forum-list-item:hover{background:var(--hover-bg)}
.forum-list-avatar{width:34px;height:34px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0}
.forum-list-info{flex:1;min-width:0}
.forum-list-user{font-size:12px;font-weight:600;color:var(--text)}
.forum-list-time{font-size:10px;color:var(--text-secondary);font-weight:400;margin-left:4px}
.forum-list-preview{font-size:11px;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:2px}
.forum-list-thumb{width:36px;height:36px;border-radius:6px;object-fit:cover;flex-shrink:0}
.forum-detail{display:flex;flex-direction:column}
.forum-detail.hidden{display:none!important}
.forum-detail-header{display:flex;align-items:center;padding:12px 16px;background:var(--sidebar-bg);border-bottom:1px solid var(--border);flex-shrink:0}
.forum-detail-body{padding:20px;flex:1;overflow-y:auto}
.forum-detail-meta{display:flex;align-items:center;gap:12px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.forum-detail-avatar{width:40px;height:40px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;flex-shrink:0}
.forum-detail-content{font-size:15px;line-height:1.7;white-space:pre-wrap;color:var(--text)}
.forum-post-status{font-size:10px;display:inline-block;padding:1px 6px;border-radius:8px;font-weight:600}
.forum-post-status.pending{background:#fef3c7;color:#92400e}
.forum-post-status.approved{background:#d1fae5;color:#065f46}
.forum-post-status.rejected{background:#fee2e2;color:#991b1b}

/* ─── File Compact ───────────────────────────────────── */
.last-seen{font-size:10px;color:var(--text-secondary);opacity:.7}


/* ─── Sakura Design System ──────────────────────────── */
:root {
    --sakura: #f06292;
    --sakura-light: #fce4ec;
    --sakura-dark: #c2185b;
    --sakura-glow: rgba(240,98,146,.15);
}

/* Forum list items - softer card style */
.forum-list-item {
    border-bottom: none !important;
    border-radius: 12px !important;
    margin-bottom: 6px !important;
    padding: 14px 12px !important;
    background: var(--sidebar-bg);
    box-shadow: 0 1px 4px rgba(0,0,0,.04);
    transition: all .2s ease !important;
}
.forum-list-item:hover {
    background: var(--sakura-light) !important;
    transform: translateX(4px);
    box-shadow: 0 2px 12px rgba(240,98,146,.2);
}
.forum-list-avatar {
    background: linear-gradient(135deg, var(--sakura), var(--sakura-dark)) !important;
    color: #fff !important;
    box-shadow: 0 2px 8px var(--sakura-glow);
    width: 38px !important; height: 38px !important;
    font-size: 15px !important;
}
.forum-list-thumb {
    border-radius: 10px !important;
    box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

/* Forum detail - premium layout */
.forum-detail-body {
    max-width: 720px !important;
    padding: 28px !important;
}
.forum-detail-meta {
    background: var(--sidebar-bg) !important;
    border-radius: 14px !important;
    padding: 16px !important;
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
    border-bottom: none !important;
    margin-bottom: 24px !important;
}
.forum-detail-avatar {
    background: linear-gradient(135deg, var(--sakura), var(--sakura-dark)) !important;
    color: #fff !important;
    box-shadow: 0 3px 12px var(--sakura-glow);
    width: 46px !important; height: 46px !important;
    font-size: 20px !important;
}
.forum-detail-content {
    font-size: 16px !important;
    line-height: 1.85 !important;
}

/* Comment section - Sakura style */
#forumCommentsSection > div {
    padding: 12px !important;
    border-radius: 10px !important;
    margin-bottom: 4px !important;
    background: var(--sidebar-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,.03);
    border-bottom: none !important;
    transition: background .15s;
}
#forumCommentsSection > div:hover { background: var(--sakura-light); }

/* Like/Comment buttons */
button[id="forumLikeBtn"] {
    transition: all .2s !important;
}
button[id="forumLikeBtn"]:hover {
    background: var(--sakura-light) !important;
    border-color: var(--sakura) !important;
}

/* Message bubbles - sakura gradient for own messages */
.message-bubble {
    transition: transform .15s;
}
.message-row.mine .message-bubble {
    background: linear-gradient(135deg, var(--sakura), var(--sakura-dark)) !important;
    box-shadow: 0 2px 8px var(--sakura-glow);
}
.message-row.theirs .message-bubble {
    box-shadow: 0 1px 4px rgba(0,0,0,.05);
}

/* Active tab highlight */
.s-tab.active { color: var(--sakura) !important; border-bottom-color: var(--sakura) !important; }
.forum-tab-btn.active { color: var(--sakura) !important; border-bottom-color: var(--sakura) !important; }

/* Scrollbar styling */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--sakura); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--sakura-dark); }

/* ─── Safe-area guard border ──────────────────────────── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    border: 3px solid var(--border);
    pointer-events: none;
    z-index: 10000;
}

/* Safe area padding for mobile notch/gesture bar */
.chat-page {
    padding: env(safe-area-inset-top, 0px) env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px);
}