/* Main Styles */

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-screen p {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
}

/* Auth Container */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.auth-form {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 420px;
}

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

.auth-logo {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

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

.auth-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-lg) 0;
    color: var(--text-muted);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

.auth-divider span {
    padding: 0 var(--spacing-md);
    font-size: var(--font-size-sm);
}

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

.forgot-password {
    display: block;
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* Main Container */
.main-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    color: var(--text-inverse);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sticky);
    transition: width var(--transition-normal);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
}

.sidebar.collapsed .logo-text,
.sidebar.collapsed .nav-text {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-inverse);
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.sidebar-toggle:hover {
    opacity: 1;
}

.sidebar-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    position: relative;
}

.sidebar-toggle span::before,
.sidebar-toggle span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
}

.sidebar-toggle span::before {
    top: -6px;
}

.sidebar-toggle span::after {
    bottom: -6px;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
    border-left-color: var(--color-primary-light);
}

.nav-icon {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) 0;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed + .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

/* Header */
.header {
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.header-title h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sync-status {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.sync-status:hover {
    background: var(--bg-tertiary);
}

.sync-status.syncing .sync-icon {
    animation: spin 1s linear infinite;
}

.sync-status.offline .sync-icon {
    color: var(--color-warning);
}

.sync-status.error .sync-icon {
    color: var(--color-error);
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    cursor: pointer;
    border: 2px solid var(--border-light);
    transition: border-color var(--transition-fast);
}

.user-avatar:hover {
    border-color: var(--color-primary);
}

.user-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    z-index: var(--z-dropdown);
}

.user-info {
    padding: var(--spacing-md);
}

.user-name {
    display: block;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

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

.user-dropdown hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 0;
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    transition: background var(--transition-fast);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: var(--font-size-sm);
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dropdown-item.logout {
    color: var(--color-error);
}

/* Page Content */
.page-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

/* Modal */
.modal-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-modal);
}

.modal {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: var(--modal-width-md);
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

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

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    transition: color var(--transition-fast);
}

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

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-light);
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--bg-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 300px;
    max-width: 450px;
    animation: slideIn 0.3s ease;
}

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

.toast.success {
    border-left: 4px solid var(--color-success);
}

.toast.error {
    border-left: 4px solid var(--color-error);
}

.toast.warning {
    border-left: 4px solid var(--color-warning);
}

.toast.info {
    border-left: 4px solid var(--color-info);
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 1.25rem;
}