/* SecureConnect Design System & Theme Styling */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #131b2e;
    --bg-tertiary: #1b2640;
    --bg-card: rgba(23, 33, 56, 0.85);
    --bg-hover: #233152;
    --border-color: rgba(255, 255, 255, 0.08);

    --accent-primary: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
    --accent-glow: rgba(59, 130, 246, 0.35);

    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --status-online: #10b981;
    --status-offline: #6b7280;
    --status-danger: #ef4444;
    --status-warning: #f59e0b;

    --msg-sent: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
    --msg-received: #1e293b;

    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-hover: #e2e8f0;
    --border-color: rgba(0, 0, 0, 0.08);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --msg-sent: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --msg-received: #e2e8f0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow: hidden;
}

/* Glassmorphism containers */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

/* Application Layout */
#app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 380px;
    min-width: 320px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--accent-glow);
    color: #fff;
    font-size: 22px;
}

.brand-title {
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.e2ee-badge {
    font-size: 0.72rem;
    background: rgba(16, 185, 129, 0.15);
    color: var(--status-online);
    padding: 3px 8px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 6px;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    font-size: 1.1rem;
}

.icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* User profile bar top of sidebar */
.user-profile-bar {
    padding: 10px 20px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.88rem;
}

.user-profile-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar-sm {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
}

/* Search Bar */
.search-container {
    padding: 12px 16px;
    position: relative;
}

.search-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 10px 16px 10px 38px;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-fast);
}

.search-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 28px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Category Filter Pills (WhatsApp Style) */
.chat-filter-pills {
    display: flex;
    gap: 8px;
    padding: 6px 16px 12px;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
}

.chat-filter-pills::-webkit-scrollbar {
    display: none;
}

.filter-pill {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-fast);
}

.filter-pill:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.filter-pill.active {
    background: rgba(16, 185, 129, 0.2);
    color: var(--status-online);
    border-color: rgba(16, 185, 129, 0.4);
}

/* Contact / Chat List */
.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 12px;
}

.chat-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.chat-item:hover {
    background: var(--bg-hover);
}

.chat-item.active {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
}

.avatar-container {
    position: relative;
    width: 48px;
    height: 48px;
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 600;
    font-size: 1.1rem;
}

.status-dot {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    position: absolute;
    bottom: 0;
    right: 0;
    border: 2px solid var(--bg-secondary);
}

.status-dot.online { background-color: var(--status-online); }
.status-dot.offline { background-color: var(--status-offline); }

.chat-info {
    flex: 1;
    min-width: 0;
}

.chat-title-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 4px;
}

.chat-name {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.chat-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.unread-badge {
    background: var(--accent-primary);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 6px;
}

/* Chat Main View */
.chat-window {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    position: relative;
}

.chat-header {
    padding: 14px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.peer-info {
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
}

.peer-name {
    font-weight: 600;
    font-size: 1.05rem;
}

.peer-status {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Message Scroll Area */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message-bubble {
    max-width: 65%;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    position: relative;
    font-size: 0.93rem;
    line-height: 1.45;
    word-break: break-word;
    animation: fadeIn 0.25s ease-out;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-bubble.sent {
    align-self: flex-end;
    background: var(--msg-sent);
    color: #ffffff;
    border-bottom-right-radius: 4px;
}

.message-bubble.received {
    align-self: flex-start;
    background: var(--msg-received);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border-color);
}

.message-sender-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 4px;
}

.message-meta {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    margin-top: 6px;
    font-size: 0.7rem;
    opacity: 0.85;
}

.receipt-icon {
    font-size: 0.85rem;
}

.receipt-icon.read { color: #60a5fa; }

/* Emoji Picker & Popovers */
.emoji-picker {
    position: absolute;
    bottom: 80px;
    left: 24px;
    width: 320px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
    z-index: 50;

    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: var(--transition-fast);
}

.emoji-picker.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.emoji-item {
    font-size: 1.4rem;
    text-align: center;
    padding: 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.emoji-item:hover {
    background: var(--bg-hover);
    transform: scale(1.2);
}

/* Reaction Badges */
.reaction-badge {
    position: absolute;
    bottom: -10px;
    right: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2px 6px;
    font-size: 0.85rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

/* Input Controls */
.chat-input-area {
    padding: 14px 24px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
}

.message-input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 12px 18px;
    border-radius: 24px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.message-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.send-btn {
    background: var(--accent-gradient);
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px var(--accent-glow);
    transition: var(--transition-fast);
    font-size: 1.1rem;
}

.send-btn:hover {
    transform: scale(1.05);
}

/* Side Security Drawer */
.security-drawer {
    position: absolute;
    top: 0;
    right: 0;
    width: 340px;
    height: 100%;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    padding: 24px;
    z-index: 40;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.security-drawer.active {
    transform: translateX(0);
}

/* Modals & Toasts */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    width: 100%;
    max-width: 460px;
    border-radius: var(--radius-lg);
    padding: 28px;
}

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 14px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}