/* ============================================
   CHIT-CHAT - MAIN STYLESHEET
   Doodle Design Theme
   ============================================ */

:root {
    /* Primary Colors - Playful & Vibrant */
    --primary-color: #FF6B9D;
    --primary-light: #FFB3D9;
    --primary-dark: #E63384;
    
    /* Secondary Colors - Complementary */
    --secondary-color: #4ECDC4;
    --secondary-light: #9BE5DE;
    --secondary-dark: #2BA3A1;
    
    /* Accent Colors */
    --accent-yellow: #FFE66D;
    --accent-purple: #A78BFA;
    --accent-green: #81C784;
    --accent-blue: #64B5F6;
    
    /* Neutral Colors */
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --text-light: #ECF0F1;
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-lighter: #F1F3F5;
    --border-color: #E0E6ED;
    
    /* Shadows - Soft */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius - Rounded Doodle Style */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --border-radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Typography */
    --font-doodle: 'Comfortaa', cursive;
    --font-title: 'Fredoka One', cursive;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Dark Mode */
body.dark-mode {
    --text-primary: #ECF0F1;
    --text-secondary: #BDC3C7;
    --bg-white: #1A1A1A;
    --bg-light: #2D2D2D;
    --bg-lighter: #3A3A3A;
    --border-color: #404040;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--text-primary);
    background-color: var(--bg-white);
    line-height: 1.6;
    transition: background-color var(--transition-normal),
                color var(--transition-normal);
}

::selection {
    background-color: var(--primary-light);
    color: var(--text-primary);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-dark);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-title);
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--secondary-dark);
}

/* ============================================
   APP CONTAINER & LAYOUT
   ============================================ */

.app-container {
    width: 100%;
    height: 100vh;
    display: flex;
    overflow: hidden;
    position: relative;
}

.hidden {
    display: none !important;
}

/* ============================================
   AUTH SECTION
   ============================================ */

.auth-section {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.auth-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 10px,
            rgba(255, 255, 255, 0.05) 10px,
            rgba(255, 255, 255, 0.05) 20px
        );
    pointer-events: none;
}

.auth-container {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 2;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.app-title {
    font-family: var(--font-title);
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.title-icon {
    font-size: 2.8rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.app-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-style: italic;
}

/* Auth Forms */
.auth-form {
    opacity: 0;
    transform: translateX(-20px);
    pointer-events: none;
    position: absolute;
    width: 100%;
    left: 0;
    transition: all var(--transition-normal);
}

.auth-form.active-form {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
    position: static;
}

.auth-form h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary-dark);
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-family: var(--font-doodle);
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-light);
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.doodle-underline {
    position: absolute;
    bottom: -4px;
    left: 0;
    height: 2px;
    width: 0;
    background: var(--secondary-color);
    transition: width var(--transition-normal);
}

.form-group input:focus ~ .doodle-underline {
    width: 100%;
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-family: var(--font-doodle);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    width: 100%;
    margin-top: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-primary);
    border: 2px solid var(--secondary-color);
}

.btn-secondary:hover {
    background: var(--secondary-light);
    color: var(--text-primary);
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.form-switch {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-switch a {
    color: var(--primary-color);
    font-weight: 600;
}

.form-switch a:hover {
    text-decoration: underline;
}

/* ============================================
   CHAT SECTION
   ============================================ */

.chat-section {
    width: 100%;
    height: 100%;
    display: flex;
}

.chat-wrapper {
    display: flex;
    width: 100%;
    height: 100%;
}

/* ============================================
   SIDEBAR
   ============================================ */

.chat-sidebar {
    width: 280px;
    background-color: var(--bg-light);
    border-right: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-full);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.3rem;
    flex-shrink: 0;
}

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

.user-info h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: var(--border-radius-full);
    display: inline-block;
    margin-right: var(--spacing-xs);
}

.status-indicator.online {
    background-color: var(--accent-green);
}

.status-indicator.away {
    background-color: var(--accent-yellow);
}

.status-indicator.offline {
    background-color: var(--text-secondary);
}

.sidebar-search {
    position: relative;
    padding: var(--spacing-md);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-white);
    color: var(--text-primary);
    font-family: var(--font-doodle);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.sidebar-search i {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.users-list-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.list-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    font-weight: 600;
    letter-spacing: 1px;
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.user-item {
    padding: var(--spacing-md);
    background-color: var(--bg-white);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-item:hover {
    background-color: var(--primary-light);
    transform: translateX(4px);
}

.user-item.active {
    background-color: var(--primary-color);
    color: white;
    border-left-color: var(--accent-yellow);
}

.user-item-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-blue));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

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

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

.user-item-status {
    font-size: 0.8rem;
    opacity: 0.8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 2px solid var(--border-color);
}

.sidebar-footer .btn {
    width: 100%;
    justify-content: center;
}

/* ============================================
   CHAT MAIN
   ============================================ */

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-white);
    overflow: hidden;
}

.chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-light);
}

.chat-header-left,
.chat-header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chat-header-left h2 {
    font-size: 1.3rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mobile-toggle {
    display: none;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.welcome-message h2 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.welcome-hint {
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
    opacity: 0.7;
}

/* Message Styles */
.message {
    display: flex;
    margin-bottom: var(--spacing-md);
    animation: slideIn 200ms ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.own {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.message.own .message-content {
    align-items: flex-end;
}

.message-bubble {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    word-wrap: break-word;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.message.own .message-bubble {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-bottom-right-radius: 4px;
}

.message:not(.own) .message-bubble {
    background-color: var(--bg-light);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.message-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.message.own .message-info {
    justify-content: flex-end;
}

.read-receipt {
    color: var(--accent-blue);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-light);
    border-radius: var(--border-radius-lg);
    width: fit-content;
}

.typing-indicator.hidden {
    display: none;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: var(--border-radius-full);
    animation: typingBounce 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
    30% { opacity: 1; transform: translateY(-10px); }
}

/* ============================================
   MESSAGE INPUT AREA
   ============================================ */

.message-input-area {
    padding: var(--spacing-lg);
    background-color: var(--bg-light);
    border-top: 2px solid var(--border-color);
}

.input-toolbar {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.input-toolbar .btn-icon {
    font-size: 1.2rem;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-md);
}

.message-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-family: var(--font-doodle);
    font-size: 0.95rem;
    color: var(--text-primary);
    background-color: var(--bg-white);
    resize: none;
    max-height: 100px;
    transition: all var(--transition-fast);
}

.message-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.1);
}

.message-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: var(--bg-lighter);
}

.message-input::placeholder {
    color: var(--text-secondary);
}

.btn-send {
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-send:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-info {
    margin-top: var(--spacing-sm);
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

#charCounter {
    display: inline-block;
}

/* ============================================
   MODALS
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 200ms ease-out;
}

.modal.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    animation: scaleIn 200ms ease-out;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.3rem;
}

.modal-close {
    font-size: 1.3rem;
    color: var(--text-secondary);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Emoji Picker */
.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
}

.emoji-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    background-color: var(--bg-light);
}

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

/* Settings Panel */
.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.setting-item label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    cursor: pointer;
    gap: var(--spacing-lg);
}

.setting-item span {
    font-weight: 600;
}

.toggle-switch {
    width: 50px;
    height: 28px;
    appearance: none;
    background: var(--text-secondary);
    border-radius: 14px;
    cursor: pointer;
    position: relative;
    transition: background-color var(--transition-fast);
}

.toggle-switch::before {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: var(--border-radius-full);
    top: 2px;
    left: 2px;
    transition: left var(--transition-fast);
}

.toggle-switch:checked {
    background: var(--accent-green);
}

.toggle-switch:checked::before {
    left: 24px;
}

/* ============================================
   NOTIFICATION TOAST
   ============================================ */

.notification-toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 999;
    animation: slideUp 300ms ease-out, slideDown 300ms ease-out 4.7s;
    max-width: 300px;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateY(0);
        opacity: 1;
    }
    to {
        transform: translateY(100%);
        opacity: 0;
    }
}

.notification-toast.hidden {
    display: none;
}

.notification-toast.success {
    background: var(--accent-green);
}

.notification-toast.error {
    background: var(--primary-dark);
}

.notification-toast.info {
    background: var(--accent-blue);
}

/* ============================================
   UTILITIES
   ============================================ */

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.opacity-50 {
    opacity: 0.5;
}

.m-0 { margin: 0; }
.p-0 { padding: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.gap-1 { gap: var(--spacing-sm); }