/**
 * Skeleton Loader CSS
 *
 * Provides skeleton placeholder styles that show while content loads.
 * Works with any theme by using CSS custom properties for colors.
 */

/* Base skeleton container - covers the page until content is ready */
.skeleton-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* When content is ready, hide skeleton */
.skeleton-container.hidden {
    display: none;
}

/* Base skeleton item - the gray pulsing rectangles */
.skeleton-item {
    background: var(--skeleton-bg, #e0e0e0);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

/* Pulse animation */
.skeleton-pulse {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Shimmer animation (alternative to pulse) */
.skeleton-shimmer {
    background: linear-gradient(
        90deg,
        var(--skeleton-bg, #e0e0e0) 0%,
        var(--skeleton-highlight, #f0f0f0) 50%,
        var(--skeleton-bg, #e0e0e0) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Common skeleton shapes */
.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text-sm {
    height: 12px;
    margin-bottom: 6px;
}

.skeleton-text-lg {
    height: 24px;
    margin-bottom: 12px;
}

.skeleton-title {
    height: 32px;
    margin-bottom: 16px;
    width: 60%;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-avatar-lg {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-button {
    height: 38px;
    width: 100px;
    border-radius: 6px;
}

.skeleton-input {
    height: 38px;
    width: 100%;
    border-radius: 6px;
}

.skeleton-card {
    border-radius: 8px;
    padding: 16px;
    background: var(--skeleton-card-bg, #f5f5f5);
}

/* Layout helpers */
.skeleton-row {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}

.skeleton-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skeleton-flex-1 {
    flex: 1;
}

/* ========================
   NAVBAR SKELETON
   ======================== */
.skeleton-navbar {
    height: 60px;
    background: var(--skeleton-navbar-bg, #1a1a2e);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 20px;
    flex-shrink: 0;
}

.skeleton-navbar .skeleton-item {
    background: var(--skeleton-navbar-item, rgba(255,255,255,0.1));
}

.skeleton-navbar-brand {
    width: 120px;
    height: 30px;
}

.skeleton-navbar-links {
    display: flex;
    gap: 16px;
    flex: 1;
}

.skeleton-navbar-link {
    width: 80px;
    height: 20px;
}

.skeleton-navbar-user {
    width: 100px;
    height: 32px;
    border-radius: 16px;
}

/* ========================
   PAGE CONTENT SKELETON
   ======================== */
.skeleton-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--skeleton-page-bg, #f8f9fa);
    overflow: hidden;
}

.skeleton-page-header {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--skeleton-header-bg, transparent);
}

.skeleton-page-content {
    flex: 1;
    padding: 0 24px 24px;
    overflow: hidden;
}

/* ========================
   CHAT SKELETON (Sidebar + Messages)
   ======================== */
.skeleton-chat-layout {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.skeleton-chat-sidebar {
    width: 280px;
    background: var(--skeleton-sidebar-bg, #1a1a2e);
    display: flex;
    flex-direction: column;
    padding: 16px;
    gap: 12px;
    flex-shrink: 0;
}

.skeleton-chat-sidebar .skeleton-item {
    background: var(--skeleton-sidebar-item, rgba(255,255,255,0.1));
}

.skeleton-chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--skeleton-chat-bg, #0f0f1a);
}

.skeleton-chat-header {
    height: 60px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--skeleton-border, rgba(255,255,255,0.1));
}

.skeleton-chat-messages {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skeleton-message {
    display: flex;
    gap: 12px;
    max-width: 70%;
}

.skeleton-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.skeleton-message-content {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.skeleton-message-bubble {
    padding: 12px 16px;
    border-radius: 12px;
    background: var(--skeleton-message-bg, rgba(255,255,255,0.05));
}

.skeleton-chat-input {
    height: 80px;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid var(--skeleton-border, rgba(255,255,255,0.1));
}

.skeleton-chat-input .skeleton-input {
    flex: 1;
    height: 48px;
    background: var(--skeleton-input-bg, rgba(255,255,255,0.05));
}

/* ========================
   TABLE SKELETON (Admin lists)
   ======================== */
.skeleton-table {
    width: 100%;
    border-collapse: collapse;
}

.skeleton-table-header {
    display: flex;
    gap: 16px;
    padding: 12px 16px;
    background: var(--skeleton-table-header-bg, rgba(0,0,0,0.05));
    border-radius: 8px 8px 0 0;
}

.skeleton-table-row {
    display: flex;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid var(--skeleton-border, rgba(0,0,0,0.1));
}

.skeleton-table-cell {
    flex: 1;
}

/* ========================
   FORM SKELETON
   ======================== */
.skeleton-form {
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.skeleton-form-section {
    background: var(--skeleton-card-bg, #ffffff);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skeleton-form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skeleton-label {
    height: 14px;
    width: 100px;
}

/* ========================
   AUTH/LOGIN SKELETON
   ======================== */
.skeleton-auth {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--skeleton-auth-bg, linear-gradient(135deg, #1a1a2e 0%, #16213e 100%));
}

.skeleton-auth-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    background: var(--skeleton-card-bg, rgba(255,255,255,0.95));
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.skeleton-auth-logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
}

.skeleton-auth-title {
    height: 28px;
    width: 200px;
}

.skeleton-auth-form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ========================
   DARK THEME OVERRIDES
   ======================== */
[data-theme="default"],
[data-theme="dark"],
[data-theme="coder"],
[data-theme="terminal"],
[data-theme="halloween"] {
    --skeleton-bg: rgba(255,255,255,0.1);
    --skeleton-highlight: rgba(255,255,255,0.2);
    --skeleton-page-bg: #0f0f1a;
    --skeleton-card-bg: rgba(255,255,255,0.05);
    --skeleton-border: rgba(255,255,255,0.1);
    --skeleton-navbar-bg: #1a1a2e;
    --skeleton-navbar-item: rgba(255,255,255,0.1);
    --skeleton-sidebar-bg: #1a1a2e;
    --skeleton-sidebar-item: rgba(255,255,255,0.1);
    --skeleton-chat-bg: #0f0f1a;
    --skeleton-message-bg: rgba(255,255,255,0.05);
    --skeleton-input-bg: rgba(255,255,255,0.05);
    --skeleton-table-header-bg: rgba(255,255,255,0.05);
}

/* ========================
   LIGHT THEME OVERRIDES
   ======================== */
[data-theme="light"],
[data-theme="writer"],
[data-theme="eink"] {
    --skeleton-bg: #e0e0e0;
    --skeleton-highlight: #f0f0f0;
    --skeleton-page-bg: #f8f9fa;
    --skeleton-card-bg: #ffffff;
    --skeleton-border: rgba(0,0,0,0.1);
    --skeleton-navbar-bg: #ffffff;
    --skeleton-navbar-item: rgba(0,0,0,0.1);
    --skeleton-sidebar-bg: #f0f0f0;
    --skeleton-sidebar-item: rgba(0,0,0,0.1);
    --skeleton-chat-bg: #ffffff;
    --skeleton-message-bg: rgba(0,0,0,0.05);
    --skeleton-input-bg: rgba(0,0,0,0.05);
    --skeleton-table-header-bg: rgba(0,0,0,0.05);
}

/* ========================
   RESPONSIVE
   ======================== */
@media (max-width: 768px) {
    .skeleton-chat-sidebar {
        display: none;
    }

    .skeleton-navbar-links {
        display: none;
    }

    .skeleton-page-header {
        padding: 16px;
    }

    .skeleton-page-content {
        padding: 0 16px 16px;
    }
}