/* ============================================
   CSS Variables - Neumorphic White & Purple
   ============================================ */
:root {
    /* Colors */
    --color-primary: #7B2CBF;
    --color-primary-dark: #5A189A;
    --color-primary-light: #9D4EDD;
    --color-secondary: #E0AAFF;
    --color-background: #F5F5F5;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #6B6B6B;
    --color-border: #E0E0E0;
    
    /* Neumorphic Shadows */
    --shadow-soft: 8px 8px 16px rgba(0, 0, 0, 0.1), -8px -8px 16px rgba(255, 255, 255, 0.9);
    --shadow-inset: inset 4px 4px 8px rgba(0, 0, 0, 0.1), inset -4px -4px 8px rgba(255, 255, 255, 0.9);
    --shadow-pressed: inset 2px 2px 4px rgba(0, 0, 0, 0.15), inset -2px -2px 4px rgba(255, 255, 255, 0.85);
    --shadow-elevated: 12px 12px 24px rgba(0, 0, 0, 0.12), -12px -12px 24px rgba(255, 255, 255, 0.95);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing (using rem) */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Side Panel */
    --side-panel-width-expanded: 16rem;
    --side-panel-width-collapsed: 4rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

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

html {
    font-size: 16px; /* Base font size for rem calculations */
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* ============================================
   Side Panel
   ============================================ */
.side-panel {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--side-panel-width-expanded);
    height: 100vh;
    background: var(--color-surface);
    box-shadow: var(--shadow-soft);
    z-index: 1000;
    transition: width var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.side-panel.collapsed {
    width: var(--side-panel-width-collapsed);
}

.side-panel-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    position: relative;
}

.toggle-btn {
    position: absolute;
    right: -1.25rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-primary);
    border: none;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 8px 8px 16px rgba(123, 44, 191, 0.3), -8px -8px 16px rgba(255, 255, 255, 0.9);
    transition: all var(--transition-fast);
    color: var(--color-surface);
    font-size: 1.5rem;
    font-weight: 600;
    z-index: 1001;
    line-height: 1;
}

.toggle-btn:hover {
    background: var(--color-primary-dark);
    box-shadow: 8px 8px 16px rgba(123, 44, 191, 0.4), -8px -8px 16px rgba(255, 255, 255, 0.9);
    transform: translateY(-50%) scale(0.95);
}

.toggle-btn:active {
    background: var(--color-primary-dark);
    box-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.2), inset -2px -2px 4px rgba(255, 255, 255, 0.1);
    transform: translateY(-50%) scale(0.9);
}

.chevron-icon {
    display: inline-block;
    transition: all var(--transition-fast);
}

.logo-section {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
}

.side-panel.collapsed .logo-section {
    justify-content: center;
    gap: 0;
}

.logo-letter {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-soft);
    flex-shrink: 0;
}

.program-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
    flex: 1;
    min-width: 0;
    transition: opacity var(--transition-base), width var(--transition-base);
    opacity: 1;
    width: auto;
}

.side-panel.collapsed .program-name {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

.side-panel-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 1rem;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin: 0;
    padding: 0;
}

.nav-list li {
    margin: 0;
    padding: 0;
}

.nav-item {
    padding: 0.625rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #7B2CBF;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-radius: 0;
    font-weight: 700;
    font-size: 0.9375rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
}

.nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.nav-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.nav-text {
    flex: 1;
    white-space: nowrap;
    transition: opacity 0.2s ease, width 0.2s ease;
}

.nav-item:hover {
    color: #5A189A;
    background-color: rgba(123, 44, 191, 0.1);
    border-color: rgba(123, 44, 191, 0.2);
    transform: translateX(2px);
}

.nav-item:active {
    color: #4C1D95;
    background-color: rgba(123, 44, 191, 0.15);
    transform: translateX(0);
}

.nav-item.active {
    color: #7B2CBF;
    background-color: rgba(123, 44, 191, 0.15);
    border-color: rgba(123, 44, 191, 0.3);
    font-weight: 700;
}

.nav-item.active:hover {
    color: #7B2CBF;
    background-color: rgba(123, 44, 191, 0.2);
    border-color: rgba(123, 44, 191, 0.4);
}

.side-panel.collapsed .nav-item {
    justify-content: center;
    padding: 0.625rem;
    gap: 0;
}

.side-panel.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

.side-panel.collapsed .nav-icon {
    width: 24px;
    height: 24px;
}

/* ============================================
   Main Wrapper
   ============================================ */
.main-wrapper {
    margin-left: var(--side-panel-width-expanded);
    transition: margin-left var(--transition-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.side-panel.collapsed ~ .main-wrapper,
.main-wrapper.side-panel-collapsed {
    margin-left: var(--side-panel-width-collapsed);
}

/* ============================================
   Header
   ============================================ */
.main-header {
    position: sticky;
    top: 0;
    width: 100%;
    background: var(--color-surface);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 100%;
}

.header-left {
    flex: 1;
    display: flex;
    align-items: center;
}

.page-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, rgba(123, 44, 191, 0.05) 0%, rgba(123, 44, 191, 0.02) 100%);
    border-radius: 0.75rem;
    border: 1px solid rgba(123, 44, 191, 0.1);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
}

.user-info:hover {
    background: linear-gradient(135deg, rgba(123, 44, 191, 0.08) 0%, rgba(123, 44, 191, 0.04) 100%);
    border-color: rgba(123, 44, 191, 0.2);
    box-shadow: 0 4px 12px rgba(123, 44, 191, 0.1);
    transform: translateY(-1px);
}

.user-info:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(123, 44, 191, 0.1);
}

.user-avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(123, 44, 191, 0.3);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.user-avatar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    pointer-events: none;
}

.user-avatar-initials {
    position: relative;
    z-index: 1;
}

.user-info-details {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
    min-width: 0;
}

.username {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    letter-spacing: -0.01em;
}

.user-email {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.user-info-dropdown {
    display: flex;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
    opacity: 0.6;
}

.user-info:hover .user-info-dropdown {
    opacity: 1;
    transform: translateY(1px);
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .side-panel {
        transform: translateX(-100%);
        width: var(--side-panel-width-expanded);
    }
    
    .side-panel.open {
        transform: translateX(0);
    }
    
    .side-panel.collapsed {
        transform: translateX(-100%);
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .header-content {
        padding: var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .user-info {
        padding: var(--spacing-xs) var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .user-avatar {
        width: 2rem;
        height: 2rem;
        font-size: var(--font-size-sm);
    }
    
    .user-info-details {
        min-width: 0;
    }
    
    .username,
    .user-email {
        max-width: 120px;
    }
    
    .user-info-dropdown {
        display: none;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .user-info {
        padding: var(--spacing-xs);
        gap: var(--spacing-xs);
    }
    
    .user-avatar {
        width: 1.75rem;
        height: 1.75rem;
        font-size: 0.75rem;
    }
    
    .user-info-details {
        min-width: 0;
    }
    
    .username,
    .user-email {
        max-width: 100px;
        font-size: 0.75rem;
    }
    
    .user-email {
        font-size: 0.7rem;
    }
    
    .user-info-dropdown {
        display: none;
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}