/* ==================== CSS Variables ==================== */
:root {
    /* Brand Colors */
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --primary-light: #5dade2;
    --primary-rgb: 52, 152, 219;

    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --danger-rgb: 231, 76, 60;

    --success-color: #27ae60;
    --success-rgb: 39, 174, 96;

    --warning-color: #f39c12;
    --warning-rgb: 243, 156, 18;

    /* Neutrals & Backgrounds */
    --bg-dark: #0a0a0a;
    --bg-dark-rgb: 10, 10, 10;
    --bg-card: #141414;
    --bg-elevated: #1a1a1a;
    --bg-input: #222222;
    --bg-glass: rgba(10, 10, 10, 0.85);
    --bg-overlay: rgba(0, 0, 0, 0.6);

    /* Text */
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --text-on-primary: #ffffff;

    /* Borders & Shadows */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);

    /* Radius */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Animations */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Layout */
    --header-height: 64px;
    --z-header: 100;
    --z-modal: 1000;
    --z-toast: 2000;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

/* ==================== Header ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: var(--z-header);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.logo-link {
    text-decoration: none;
}

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

/* ==================== Toast Notifications ==================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 280px;
    max-width: 400px;
    animation: slideIn var(--transition-normal) ease;
}

.toast.toast-exit {
    animation: slideOut var(--transition-normal) ease forwards;
}

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

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }

    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ==================== Common Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7);
    }

    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(231, 76, 60, 0);
    }

    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0);
    }
}

/* ==================== Common Modal Base ==================== */
.modal-base {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-base.visible {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: var(--bg-overlay);
}

.modal-dialog {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

/* ==================== Common Progress Bar ==================== */
.progress-bar {
    height: 6px;
    background: var(--bg-input);
    border-radius: var(--radius-xs);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-xs);
    width: 0%;
    transition: width var(--transition-fast);
}

.toast-icon {
    flex-shrink: 0;
}

.toast-success .toast-icon {
    color: var(--success-color);
}

.toast-error .toast-icon {
    color: var(--danger-color);
}

.toast-warning .toast-icon {
    color: var(--warning-color);
}

/* ==================== Language Switcher ==================== */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-elevated);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.lang-link {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.lang-link:hover {
    color: var(--text-primary);
}

.lang-link.active {
    color: var(--primary-color);
}

.lang-divider {
    color: var(--border-color);
    font-size: 0.75rem;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast), transform 0.1s ease;
    text-decoration: none;
    line-height: 1;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-on-primary);
}

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

.btn-secondary {
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-logout {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-logout:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-settings {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-settings:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-settings:active {
    transform: rotate(180deg);
}

.btn-option {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

.btn-option:hover {
    background: var(--bg-elevated);
    border-color: var(--primary-color);
}

.btn-option svg {
    flex-shrink: 0;
}


/* ==================== Responsive Adjustments ==================== */
@media (max-width: 640px) {
    .header {
        padding: 0 var(--spacing-md);
    }

    .logo {
        font-size: 1.25rem;
    }

    .btn-text {
        display: none;
    }

    .main-content {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }

    .toast {
        min-width: auto;
        max-width: none;
    }
}

/* ==================== Burger Menu ==================== */
.burger-menu {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    align-items: center;
    justify-content: center;
}

.burger-menu:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

@media (max-width: 768px) {
    .burger-menu {
        display: flex;
    }

    .header-right > :not(.burger-menu) {
        display: none;
    }
}

/* ==================== Mobile Menu ==================== */
.mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: calc(var(--z-header) + 10);
}

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

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--bg-card);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: calc(var(--z-header) + 20);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    transform: translateX(0);
}

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

.mobile-menu-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.mobile-menu-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-menu-close:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.mobile-menu-nav {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    background: transparent;
    border: none;
    width: 100%;
    font-size: 1rem;
    cursor: pointer;
    font-family: inherit;
}

.menu-item:hover {
    background: var(--bg-elevated);
}

.menu-item svg {
    flex-shrink: 0;
    color: var(--text-secondary);
}

.menu-item:hover svg {
    color: var(--text-primary);
}

.menu-item-logout {
    color: var(--danger-color);
}

.menu-item-logout svg {
    color: var(--danger-color);
}

.menu-item span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.menu-item-logout:hover {
    background: rgba(231, 76, 60, 0.1);
}

.menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-sm) 0;
}

.menu-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.lang-switcher-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: var(--spacing-md);
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin: 0 var(--spacing-sm);
    width: fit-content;
}

.lang-switcher-menu .lang-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.lang-switcher-menu .lang-link:hover {
    color: var(--text-primary);
}

.lang-switcher-menu .lang-link.active {
    color: var(--primary-color);
}

.lang-switcher-menu .lang-divider {
    color: var(--border-color);
    font-size: 0.75rem;
    margin: 0;
    padding: 0;
    height: auto;
    background: transparent;
}

/* ==================== Menu Info ==================== */
.menu-info {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}