/**
 * Perfect Aptitude Theme Master Stylesheet
 * Location: assets/css/theme.css
 */

:root {
    /* 1. Curated Design Tokens */
    --pa-bg: #f8fbff;
    --pa-surface: #ffffff;
    --pa-surface-soft: #f1f5f9;
    --pa-primary: #3b82f6;
    --pa-primary-dark: #1d4ed8;
    --pa-secondary: #10b981;
    --pa-accent: #f97316;
    --pa-success: #10b981;
    --pa-warning: #f59e0b;
    --pa-danger: #dc2626;
    --pa-text: #0f172a;
    --pa-muted: #64748b;
    --pa-border: #e2e8f0;
    --pa-radius: 12px;
    --pa-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --pa-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset / Base overrides */
body {
    background: var(--pa-bg);
    color: var(--pa-text);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

/* 2. Global Reusable Classes */
.pa-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--pa-bg);
}

.pa-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    box-sizing: border-box;
}

/* Responsive Dashboard Layout */
.pa-dashboard-layout {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

.pa-sidebar {
    width: 260px;
    background: var(--pa-surface);
    border-right: 1px solid var(--pa-border);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    flex-shrink: 0;
    box-sizing: border-box;
}

.pa-topbar {
    height: 70px;
    background: var(--pa-surface);
    border-bottom: 1px solid var(--pa-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    box-sizing: border-box;
}

.pa-main {
    flex-grow: 1;
    background: var(--pa-bg);
    padding: 40px;
    overflow-y: auto;
    box-sizing: border-box;
}

/* Cards & Widgets */
.pa-card {
    background: var(--pa-surface);
    border: 1px solid var(--pa-border);
    border-radius: var(--pa-radius);
    padding: 24px;
    box-shadow: var(--pa-shadow);
    transition: var(--pa-transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    box-sizing: border-box;
}

.pa-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px -2px rgba(0, 0, 0, 0.08);
}

.pa-card-header {
    margin-bottom: 16px;
}

.pa-card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--pa-text);
    margin: 0 0 4px 0;
}

.pa-card-subtitle {
    font-size: 13px;
    color: var(--pa-muted);
    margin: 0;
}

/* KPI Stat Cards */
.pa-stat-card {
    background: var(--pa-surface);
    border: 1px solid var(--pa-border);
    border-radius: var(--pa-radius);
    padding: 24px;
    box-shadow: var(--pa-shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--pa-transition);
    box-sizing: border-box;
}

.pa-stat-card:hover {
    transform: translateY(-2px);
}

/* Responsive Grid System */
.pa-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

/* Buttons */
.pa-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: var(--pa-transition);
    text-decoration: none;
    text-align: center;
    box-sizing: border-box;
}

.pa-button-primary {
    background: var(--pa-primary);
    color: #ffffff !important;
}

.pa-button-primary:hover {
    background: var(--pa-primary-dark);
}

.pa-button-secondary {
    background: var(--pa-surface-soft);
    color: var(--pa-text) !important;
    border: 1px solid var(--pa-border);
}

.pa-button-secondary:hover {
    background: var(--pa-border);
}

.pa-button-success {
    background: var(--pa-success);
    color: #ffffff !important;
}

.pa-button-success:hover {
    filter: brightness(0.9);
}

.pa-button-danger {
    background: var(--pa-danger);
    color: #ffffff !important;
}

.pa-button-danger:hover {
    filter: brightness(0.9);
}

/* Badge Utility */
.pa-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pa-badge-primary { background: rgba(59, 130, 246, 0.1); color: var(--pa-primary); }
.pa-badge-success { background: rgba(16, 185, 129, 0.1); color: var(--pa-success); }
.pa-badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--pa-warning); }
.pa-badge-danger { background: rgba(220, 38, 38, 0.1); color: var(--pa-danger); }

/* Forms & Inputs */
.pa-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pa-input, .pa-select {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    border: 1px solid var(--pa-border);
    border-radius: 8px;
    background: var(--pa-surface);
    color: var(--pa-text);
    transition: var(--pa-transition);
    box-sizing: border-box;
}

.pa-input:focus, .pa-select:focus {
    outline: none;
    border-color: var(--pa-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Alert Utility */
.pa-alert {
    padding: 16px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid transparent;
    box-sizing: border-box;
}

.pa-alert-success { background: rgba(16, 185, 129, 0.05); border-color: rgba(16, 185, 129, 0.15); color: var(--pa-success); }
.pa-alert-warning { background: rgba(245, 158, 11, 0.05); border-color: rgba(245, 158, 11, 0.15); color: var(--pa-warning); }
.pa-alert-danger { background: rgba(220, 38, 38, 0.05); border-color: rgba(220, 38, 38, 0.15); color: var(--pa-danger); }

/* Empty States */
.pa-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    box-sizing: border-box;
}

.pa-empty-state .dashicons {
    font-size: 48px;
    width: 48px;
    height: 48px;
    color: var(--pa-muted);
    margin-bottom: 16px;
}

/* Progress & Tabs */
.pa-progress {
    width: 100%;
    height: 8px;
    background: var(--pa-surface-soft);
    border-radius: 9999px;
    overflow: hidden;
}

.pa-progress-bar {
    height: 100%;
    background: var(--pa-primary);
    transition: width 0.3s ease;
}

.pa-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--pa-border);
    margin-bottom: 24px;
}

.pa-tab {
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--pa-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--pa-transition);
}

.pa-tab.active {
    color: var(--pa-primary);
    border-bottom-color: var(--pa-primary);
}

/* 3. Role-Based Visual Modes */

/* Student Mode: friendly, colorful, simple */
.student-mode {
    --pa-radius: 20px;
    --pa-bg: #f0fdf4; /* Very soft light green */
    --pa-primary: #10b981;
}
.student-mode .pa-card {
    border-radius: var(--pa-radius);
    background: #ffffff;
    border-color: rgba(16, 185, 129, 0.15);
}
.student-mode .pa-button {
    border-radius: 12px;
    padding: 14px 28px;
    font-size: 15px;
}

/* Teacher Mode: clean, calm, productivity-focused */
.teacher-mode {
    --pa-radius: 10px;
    --pa-bg: #f8fafc; /* Professional cold gray */
    --pa-primary: #059669; /* Peaceful emerald */
}

/* Institute Mode: professional, analytics-focused */
.institute-mode {
    --pa-radius: 12px;
    --pa-bg: #f8fbff;
    --pa-primary: #3b82f6;
}

/* Public Homepage Styles */
.pa-homepage {
    background: var(--pa-bg);
}

.pa-hero {
    padding: 100px 0;
    text-align: center;
    background: radial-gradient(circle at top, rgba(59, 130, 246, 0.05), transparent);
}

.pa-hero h1 {
    font-size: 56px;
    font-weight: 900;
    color: var(--pa-text);
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.pa-section {
    padding: 80px 0;
    border-bottom: 1px solid var(--pa-border);
}

.pa-page-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--pa-text);
    margin: 0 0 8px 0;
}

.pa-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

.pa-table th, .pa-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--pa-border);
}

.pa-table th {
    font-weight: 700;
    color: var(--pa-muted);
}

.pa-skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--pa-primary);
    color: #ffffff;
    padding: 10px 14px;
    border-radius: 0 0 8px 8px;
    z-index: 9999;
}

.pa-skip-link:focus {
    left: 16px;
    top: 0;
}

.pa-narrow-container {
    max-width: 650px;
    text-align: left;
}

.pa-medium-container {
    max-width: 800px;
    text-align: left;
}

.pa-page-header {
    text-align: center;
    margin-bottom: 40px;
}

.pa-page-badge {
    margin-bottom: 16px;
}

.pa-page-title-xl {
    font-size: 40px;
    font-weight: 900;
    color: var(--pa-text);
    margin: 0 0 12px;
}

.pa-page-subtitle {
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

.pa-form-card {
    background: #ffffff;
    padding: 40px;
}

.pa-form-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--pa-text);
    margin-bottom: 24px;
    text-align: center;
    border-bottom: 2px solid var(--pa-surface-soft);
    padding-bottom: 12px;
}

.pa-form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.pa-form-grid-wide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    align-items: start;
    margin-bottom: 60px;
}

.pa-field-label {
    font-weight: 600;
    font-size: 13px;
    color: var(--pa-text);
    display: block;
    margin-bottom: 6px;
}

.pa-field-label--small {
    font-size: 12px;
    margin-bottom: 4px;
}

.pa-input-sm,
.pa-select-sm,
.pa-textarea-sm {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--pa-border);
    border-radius: 6px;
    font-size: 13px;
    box-sizing: border-box;
}

.pa-select-sm {
    background: #ffffff;
}

.pa-textarea-sm {
    min-height: 100px;
    resize: vertical;
}

.pa-submit-full {
    padding: 14px;
    font-size: 14px;
    width: 100%;
    border: 0;
    cursor: pointer;
    text-align: center;
}

.pa-support-stack {
    margin-bottom: 24px;
    border-left: 4px solid var(--pa-primary);
}

.pa-demo-stack {
    border-left: 4px solid var(--pa-success);
    background: var(--pa-surface-soft);
}

.pa-support-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--pa-text);
    margin-bottom: 8px;
}

.pa-support-text {
    font-size: 13px;
    color: var(--pa-muted);
    line-height: 1.6;
    margin: 0;
}

.pa-support-text--spaced {
    margin-bottom: 16px;
}

.pa-institution-context {
    background: var(--pa-surface-soft);
    padding: 16px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pa-context-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--pa-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
}

/* Responsive Media Queries */
@media (max-width: 768px) {
    .pa-dashboard-layout {
        flex-direction: column;
    }
    .pa-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--pa-border);
    }
    .pa-main {
        padding: 24px;
    }
    .pa-hero h1 {
        font-size: 38px;
    }
}