/* Base styles and CSS variables */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap");

:root {
    /* Spacing - balanced responsive units */
    --space-xs: 0.4rem;
    --space-sm: 0.6rem;
    --space-md: 0.8rem;
    --space-lg: 1.2rem;
    --space-xl: 1.6rem;
    --space-2xl: 2.4rem;

    /* Border radius - rem for consistency */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;

    /* Dark Theme Colors (Default) */
    --bg-primary: #0f1419;
    --bg-secondary: #1a232e;
    --bg-tertiary: #232f3e;
    --bg-surface: #232f3e;
    --bg-surface-hover: #2a3848;
    --bg-surface-active: #334155;

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);

    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.15);

    --accent-primary: #10b981;
    --accent-hover: #059669;
    --accent-active: #047857;
    --accent-green: #22c55e;
    --accent-blue: #3b82f6;
    --accent-blue-light: #60a5fa;

    --border-hover: rgba(255, 255, 255, 0.25);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f8fafc;
    --bg-surface-active: #e2e8f0;

    --text-primary: #1e293b;
    --text-secondary: rgba(30, 41, 59, 0.8);
    --text-tertiary: rgba(30, 41, 59, 0.6);

    --border-primary: rgba(30, 41, 59, 0.1);
    --border-secondary: rgba(30, 41, 59, 0.15);
}

/* Page header styles */
.page-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.page-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    color: var(--accent-blue);
}

.page-icon svg {
    display: block;
}

/* Placeholder content */
.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-secondary);
    text-align: center;
}

.placeholder-content p {
    font-size: 1.1rem;
    margin: 0;
}

/* Language item improvements */
.language-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.language-item:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-hover);
}

.language-item svg {
    color: var(--accent-blue);
    flex-shrink: 0;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background: transparent !important;
    overflow: hidden;
}

body {
    font-family:
        "Poppins",
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Roboto",
        sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: transparent !important;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App container */
.app-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    background: transparent;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 20%;
    min-width: 200px;
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    background: transparent;
    border-right: 1px solid var(--border-primary);
}

.nav-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.nav-button:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-secondary);
    transform: translateX(2px);
}

.nav-button.active {
    background: var(--bg-surface-active);
    border-color: var(--border-secondary);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.nav-button svg {
    flex-shrink: 0;
    color: var(--text-primary);
}

.nav-button span {
    color: var(--text-primary);
}

/* Main content */
.main-content {
    flex: 1;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

/* Page system */
.page {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.page.active {
    opacity: 1;
    visibility: visible;
}

.content-container {
    padding: var(--space-xl);
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* Common page elements */
.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.page-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Icon buttons */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm);
    width: 40px;
    height: 40px;
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

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

.icon-btn:active {
    background: rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.9);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(8px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 28rem;
    width: 90%;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.modal-text {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.modal-btn {
    padding: var(--space-sm) var(--space-lg);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.modal-btn:hover {
    background: var(--accent-hover);
}

.modal-btn:active {
    background: var(--accent-active);
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

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

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

/* Simple Notice Styles */
.simple-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    text-align: center;
}

.simple-notice p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    line-height: 1.4;
    margin: 0;
    max-width: 400px;
}

/* Theme Selection Styles */
.theme-selection-content {
    padding: var(--space-lg) 0;
}

.theme-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-md) 0;
}

.theme-options {
    display: flex;
    gap: var(--space-lg);
}

.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--bg-surface);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 80px;
}

.theme-option:hover {
    border-color: var(--border-secondary);
}

.theme-option.active {
    border-color: var(--accent-primary);
}

.theme-preview {
    width: 40px;
    height: 30px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-primary);
}

.dark-preview {
    background: linear-gradient(45deg, #0f1419 50%, #232f3e 50%);
}

.light-preview {
    background: linear-gradient(45deg, #ffffff 50%, #f1f5f9 50%);
    border-color: rgba(30, 41, 59, 0.2);
}

.theme-option span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}