/**
 * Layout Styles
 * Grid, Containers, Responsive Layouts
 */

/* App Container */
#app {
    min-height: 100vh;
    min-height: 100dvh;
}

/* Page Container - Centered content */
.page-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: var(--spacing-4);
}

/* Auth Page Layout */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.auth-header h1 {
    font-size: var(--font-size-3xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-2);
}

.auth-header p {
    color: var(--color-text-secondary);
    margin: 0;
}

.auth-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-8);
}

.auth-card h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-6);
    text-align: center;
}

.auth-description {
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.auth-switch {
    text-align: center;
    margin-top: var(--spacing-6);
    margin-bottom: 0;
    color: var(--color-text-secondary);
}

/* Chat App Layout */
.chat-app {
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: var(--z-sticky);
}

.sidebar-header {
    height: var(--header-height);
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-3);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex: 1;
    min-width: 0;
}

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

.user-name {
    display: block;
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-status {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.sidebar-search {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.sidebar-search input {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-2) 0;
}

.sidebar-footer {
    padding: var(--spacing-4);
    border-top: 1px solid var(--color-border);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--color-bg-secondary);
}

/* Empty State */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-8);
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-4);
}

.empty-state h2 {
    margin-bottom: var(--spacing-2);
}

.empty-state p {
    color: var(--color-text-secondary);
    margin: 0;
}

/* Chat View */
.chat-view {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-header {
    height: var(--header-height);
    padding: var(--spacing-4);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.mobile-back {
    display: none;
}

.chat-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex: 1;
    min-width: 0;
}

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

.chat-details h2 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-status {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.chat-actions {
    display: flex;
    gap: var(--spacing-1);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-4);
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

/* Typing Indicator */
.typing-indicator {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.typing-dots {
    display: flex;
    gap: 3px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--color-text-tertiary);
    border-radius: 50%;
    animation: typing-bounce 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing-bounce {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Message Input Area */
.message-input-area {
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-2);
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-wrapper textarea {
    width: 100%;
    max-height: 120px;
    padding: var(--spacing-3);
    resize: none;
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
}

/* Modal Layout */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay:not(.hidden) .modal {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.modal-close {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    line-height: 1;
    padding: var(--spacing-1);
}

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

.modal-body {
    padding: var(--spacing-6);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-3);
}

/* Settings Sections */
.settings-section {
    margin-bottom: var(--spacing-6);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-4);
}

/* Responsive Layout */
@media (max-width: 768px) {
    .chat-app {
        position: relative;
    }

    .sidebar {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: 100%;
        max-width: none;
        transform: translateX(0);
        transition: transform var(--transition-normal);
        z-index: var(--z-fixed);
    }

    .sidebar.sidebar-hidden {
        transform: translateX(-100%);
    }

    .chat-main {
        width: 100%;
    }

    .mobile-back {
        display: flex;
    }

    .modal {
        max-width: none;
        margin: 0;
        border-radius: 0;
        max-height: 100vh;
        height: 100%;
    }
}

@media (min-width: 1200px) {
    :root {
        --sidebar-width: 360px;
    }
}