/*
 * styles.css (Redesign)
 * For the Entrepreneurship Toolbox
 * Implements "Phase 1: Visual and UX Improvements"
 * * NOTE: This file is UNCHANGED from your original upload.
 */

/* * ===================================================================
 * :ROOT - Design Tokens and Global Variables
 * ===================================================================
 */
:root {
    /* Colors (Professional, Engaging Palette) */
    --color-primary: #005A9C;         /* Professional Blue */
    --color-primary-dark: #004A80;
    --color-primary-light: #E6F0F8;
    
    --color-accent: #00796B;          /* Engaging Teal/Green */
    --color-accent-light: #E0F2F1;
    
    --color-background-app: #F4F7FA;  /* Softer, lighter app bg */
    --color-background-page: #FFFFFF; /* Card/Page background */
    --color-background-sidebar: #0F172A; /* Dark Sidebar */
    --color-background-login: #EBF2F9;
    
    --color-text-primary: #1A202C;    /* Dark (on light bg) */
    --color-text-secondary: #4A5568;
    --color-text-light: #718096;
    --color-text-primary-dark-bg: #E2E8F0; /* Light (on dark bg) */
    --color-text-secondary-dark-bg: #94A3B8;
    --color-text-accent: var(--color-primary);
    
    --color-border: #CBD5E1;
    --color-border-light: #E2E8F0;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-danger: #D32F2F;
    --color-danger-light: #FFEBEE;
    --color-locked: #A0AEC0;

    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-sm: 0.875rem; /* 14px */
    --font-size-base: 1rem;   /* 16px */
    --font-size-md: 1.125rem; /* 18px */
    --font-size-lg: 1.25rem;  /* 20px */
    --font-size-xl: 1.5rem;   /* 24px */
    --font-size-xxl: 1.875rem;/* 30px */

    /* Spacing */
    --space-1: 0.25rem; /* 4px */
    --space-2: 0.5rem;  /* 8px */
    --space-3: 1rem;    /* 16px */
    --space-4: 1.5rem;  /* 24px */
    --space-5: 2rem;    /* 32px */

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 80px;
    --header-height: 70px; /* Not used in this design */
    --content-max-width: 1200px;
    
    /* Effects */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px 0 var(--color-shadow), 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
    --transition-fast: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
}

/* Import Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');


/* * ===================================================================
 * 1. GLOBAL & RESET
 * ===================================================================
 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Specific body classes for login vs app */
body.login-page-body {
    background-color: var(--color-background-login);
}
body.app-page-body {
    background-color: var(--color-background-app);
}

a {
    color: var(--color-text-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-2);
}
h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); border-bottom: 1px solid var(--color-border-light); padding-bottom: var(--space-2); margin-bottom: var(--space-3); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }
p {
    margin-bottom: var(--space-3);
}
ul, ol {
    margin-bottom: var(--space-3);
    padding-left: var(--space-3);
}
li {
    margin-bottom: var(--space-2);
}
small {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}
hr.divider {
    border: 0;
    height: 1px;
    background-color: var(--color-border-light);
    margin: var(--space-4) 0;
}

/* * ===================================================================
 * 2. SHARED COMPONENTS (Buttons, Forms, Cards)
 * ===================================================================
 */

/* ---------------------------------- */
/* 2.1 Buttons                      */
/* ---------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.btn:hover {
    text-decoration: none;
}
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-secondary {
    background-color: var(--color-background-page);
    color: var(--color-primary);
    border-color: var(--color-border);
}
.btn-secondary:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-color: var(--color-primary-light);
}

.btn-danger {
    background-color: var(--color-danger);
    color: #FFFFFF;
}
.btn-danger:hover {
    background-color: #A82525;
    color: #FFFFFF;
}

/* ---------------------------------- */
/* 2.2 Forms                        */
/* ---------------------------------- */
.form-group {
    margin-bottom: var(--space-3);
}
.form-group label {
    display: block;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
    font-family: var(--font-family-sans);
    color: var(--color-text-primary);
    background-color: var(--color-background-app);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-group input[disabled] {
    background-color: var(--color-border-light);
    cursor: not-allowed;
}
.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ---------------------------------- */
/* 2.3 Cards                        */
/* ---------------------------------- */
.card {
    background-color: var(--color-background-page);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
    padding: var(--space-4);
    height: 100%;
}
.sticky-card {
    position: sticky;
    top: var(--space-4);
}


/* * ===================================================================
 * 3. LAYOUT (Login, App, Sidebar, Page)
 * ===================================================================
 */

/* ---------------------------------- */
/* 3.1 Login Page                   */
/* ---------------------------------- */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-4);
}
.login-box {
    width: 100%;
    max-width: 450px;
    padding: var(--space-5);
    border-top: 4px solid var(--color-primary);
}
.login-box .logo-area {
    text-align: center;
    margin-bottom: var(--space-3);
}
.login-box .logo-area h1 {
    font-size: var(--font-size-xxl);
    color: var(--color-primary);
    border: none;
    margin: 0;
}
.login-description {
    text-align: center;
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}
.login-box #signin-btn {
    width: 100%;
    padding: 0.85rem;
    font-size: var(--font-size-md);
    margin-top: var(--space-1);
}

/* ---------------------------------- */
/* 3.2 App Container                */
/* ---------------------------------- */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ---------------------------------- */
/* 3.3 Sidebar                      */
/* ---------------------------------- */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-background-sidebar);
    color: var(--color-text-primary-dark-bg);
    padding: var(--space-4) var(--space-3);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width var(--transition-fast);
    /* Forcing sidebar to be on left */
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}
.sidebar-header {
    margin-bottom: var(--space-4);
    padding: 0 var(--space-3);
}
.sidebar-header .logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: #FFFFFF;
    text-decoration: none;
}
.sidebar-nav {
    list-style: none;
    padding-left: 0;
    flex-grow: 1;
}
.sidebar-nav li {
    margin-bottom: var(--space-1);
}
.sidebar-nav .nav-link,
.sidebar-footer .nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.8rem var(--space-3);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-secondary-dark-bg);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
}
.sidebar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: #FFFFFF;
}
.sidebar-nav .nav-link.active {
    background-color: var(--color-primary);
    color: #FFFFFF;
}
.sidebar-nav .nav-link i,
.sidebar-footer .nav-link i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ---------------------------------- */
/* 3.4 Page Content Area            */
/* ---------------------------------- */
.page-content {
    flex-grow: 1;
    padding: var(--space-5);
    margin-left: var(--sidebar-width); /* Push content to the right of fixed sidebar */
    width: calc(100% - var(--sidebar-width));
}
.page-header {
    margin-bottom: var(--space-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.page-title {
    font-size: var(--font-size-xxl);
    border: none;
    margin: 0;
}
.page-description {
    font-size: var(--font-size-md);
    color: var(--color-text-light);
    margin-top: calc(-1 * var(--space-3));
    margin-bottom: var(--space-4);
}
.user-greeting {
    font-size: var(--font-size-md);
    font-weight: 500;
}

/* ---------------------------------- */
/* 3.5 Modals                       */
/* ---------------------------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
}
.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}
.modal {
    background-color: var(--color-background-page);
    border-radius: var(--border-radius-lg);
    padding: var(--space-4);
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    position: relative;
    transform: translateY(-20px);
    transition: transform var(--transition-fast);
}
.modal-overlay.visible .modal {
    transform: translateY(0);
}
.modal-close-btn {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-light);
    padding: var(--space-1);
}
.modal-close-btn:hover {
    color: var(--color-text-primary);
}
.modal-body {
    padding-top: var(--space-3);
}
.modal-body h2 {
    border: none;
    margin-bottom: var(--space-3);
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    margin-top: var(--space-4);
}


/* * ===================================================================
 * 4. PAGE-SPECIFIC STYLES
 * ===================================================================
 */

/* ---------------------------------- */
/* 4.1 Dashboard                    */
/* ---------------------------------- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: minmax(250px, auto);
    gap: var(--space-4);
}
.card-progress {
    grid-column: 1 / 2;
    grid-row: 1 / 2;
}
.card-progress h2 {
    border: none;
    margin-bottom: var(--space-4);
}
.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: var(--color-primary-light);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-2);
}
.progress-bar {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: 6px;
    transition: width var(--transition-slow);
}
.progress-label {
    font-weight: 600;
    color: var(--color-primary);
    font-size: var(--font-size-md);
    margin-bottom: var(--space-3);
    display: block;
}

.card-next-lesson {
    grid-column: 2 / 3;
    grid-row: 1 / 3;
    display: flex;
    flex-direction: column;
}
.next-lesson-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
    flex-grow: 1;
    color: var(--color-text-light);
}
.next-lesson-placeholder .icon {
    font-size: 3rem;
    margin-bottom: var(--space-3);
}
.next-lesson-content-block {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.next-lesson-content-block .video-placeholder {
    width: 100%;
    height: 200px;
    background-color: var(--color-background-app);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 1.5rem;
    margin-bottom: var(--space-3);
}
.next-lesson-content-block .module-tag {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-accent-light);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius-sm);
    align-self: flex-start;
    margin-bottom: var(--space-2);
}
.next-lesson-content-block h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-3);
}
.next-lesson-content-block .btn {
    margin-top: auto;
}

.quick-links-list {
    list-style: none;
    padding-left: 0;
}
.quick-links-list li {
    margin-bottom: 0;
}
.quick-links-list li a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
    font-weight: 500;
}
.quick-links-list li:last-child a {
    border-bottom: none;
}
.quick-links-list li a:hover {
    color: var(--color-primary-dark);
    text-decoration: none;
}
.quick-links-list li .icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}
.quick-links-list li .feedback-status {
    margin-left: auto;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
}

/* ---------------------------------- */
/* 4.2 Modules (List)               */
/* ---------------------------------- */
.module-list {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-4);
}
.module-card {
    display: flex;
    flex-direction: column;
    padding: 0; /* Remove default card padding */
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
}
.module-card:not(.locked):hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.module-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4) 0;
}
.module-level-tag {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-accent-light);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius-sm);
    text-transform: capitalize;
}
.module-lock-status, .module-progress-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light);
}
.module-lock-status {
    color: var(--color-locked);
}
.module-progress-status.completed {
    color: var(--color-accent);
}
.module-card .module-title {
    font-size: var(--font-size-xl);
    border: none;
    margin: 0;
    padding: var(--space-3) var(--space-4);
}
.module-card .module-description {
    font-size: var(--font-size-base);
    padding: 0 var(--space-4);
    margin-bottom: var(--space-3);
    flex-grow: 1;
}
.module-card .module-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    background-color: var(--color-background-app);
    border-top: 1px solid var(--color-border-light);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}
.module-lesson-count {
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* Locked State */
.module-card.locked {
    background-color: var(--color-background-app);
    cursor: not-allowed;
}
.module-card.locked .module-title,
.module-card.locked .module-description,
.module-card.locked .module-lesson-count {
    color: var(--color-locked);
}
.module-card.locked .module-level-tag {
    background-color: var(--color-border);
    color: var(--color-text-light);
}
.module-card.locked .module-footer {
    background-color: #E2E8F0;
}

/* ---------------------------------- */
/* 4.3 Lesson (Detail)              */
/* ---------------------------------- */
.breadcrumb {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-1);
}
.breadcrumb a {
    color: var(--color-text-light);
}
.breadcrumb a:hover {
    color: var(--color-text-primary);
}

.lesson-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-4);
    align-items: flex-start;
}
.lesson-content-container {
    padding: 0;
    overflow: hidden; /* To contain video radius */
}
.video-placeholder-container {
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    position: relative;
    background-color: #000;
}
.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #FFF;
}
.video-placeholder i {
    width: 60px;
    height: 60px;
    margin-bottom: var(--space-3);
}
.video-placeholder p {
    font-size: var(--font-size-md);
    margin: 0;
}
.lesson-content-body {
    padding: var(--space-4);
}
.lesson-content-body h2 {
    border: none;
    margin-bottom: var(--space-3);
}
.lesson-content-body ul {
    list-style-type: '✓  ';
    padding-left: var(--space-4);
}
.lesson-content-body ul li {
    padding-left: var(--space-2);
    font-size: var(--font-size-md);
}

.lesson-nav-container h3 {
    font-size: var(--font-size-md);
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-3);
}
.lesson-nav-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--space-4);
}
.lesson-nav-list li {
    margin-bottom: 0;
}
.lesson-nav-list li a {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    font-weight: 500;
    text-decoration: none;
}
.lesson-nav-list li:last-child a {
    border-bottom: none;
}
.lesson-nav-list li a .icon {
    margin-top: 4px;
    color: var(--color-text-light);
}
.lesson-nav-list li a.active {
    color: var(--color-primary);
    font-weight: 600;
}
.lesson-nav-list li a.active .icon {
    color: var(--color-primary);
}
.lesson-nav-list li a.completed .icon {
    color: var(--color-accent);
}

.lesson-completion-box {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
}
.lesson-completion-box .btn {
    width: 100%;
}
.lesson-completion-box .btn.completed {
    background-color: var(--color-accent);
    color: #FFF;
}
.lesson-completion-box .btn.completed:hover {
    background-color: #005A4F;
}

/* ---------------------------------- */
/* 4.4 Business Planning Tools      */
/* ---------------------------------- */
.tools-grid {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: var(--space-4);
    align-items: flex-start;
}
.tools-column-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}
.tool-textarea {
    min-height: 120px;
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* File Upload */
.file-upload-label {
    margin: 0;
}
.file-drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--space-5);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.file-drop-zone.dragging {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}
.file-drop-zone i {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
    display: block;
    margin-left: auto;
    margin-right: auto;
}
.file-drop-zone span {
    color: var(--color-text-light);
    font-weight: 500;
}
.file-drop-zone span#file-drop-name {
    color: var(--color-text-primary);
    font-weight: 600;
}
#file-submit-btn {
    width: 100%;
}
#upload-success-msg {
    margin-top: var(--space-3);
    padding: var(--space-3);
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--border-radius-md);
    text-align: center;
}
#upload-success-msg p {
    margin: 0;
}

/* ---------------------------------- */
/* 4.5 Resources (New)              */
/* ---------------------------------- */
.resource-list {
    list-style: none;
    padding-left: 0;
}
.resource-list li {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
}
.resource-list li:last-child {
    border-bottom: none;
    margin-bottom: 0;
}
.resource-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--border-radius-md);
}
.resource-icon i {
    width: 24px;
    height: 24px;
}
.resource-info {
    flex-grow: 1;
}
.resource-info h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-1);
}
.resource-info p {
    margin-bottom: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}
.resource-list li .btn {
    flex-shrink: 0;
    margin-left: auto;
}


/* ---------------------------------- */
/* 4.6 User Profile                   */
/* ---------------------------------- */
.profile-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-4);
    align-items: flex-start;
}
.card-profile-info {
    text-align: center;
}
.avatar-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background-color: var(--color-background-app);
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    font-weight: 600;
    margin: 0 auto var(--space-3);
}
.card-profile-info h2 {
    border: none;
    margin-bottom: var(--space-1);
}
.card-profile-info p {
    margin-bottom: var(--space-1);
    color: var(--color-text-secondary);
}
.card-profile-info .user-join-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-2);
}

.timeline-list {
    list-style: none;
    padding-left: 0;
    margin-top: var(--space-4);
}
.timeline-list li {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
}
.timeline-list li:last-child {
    border-bottom: none;
}
.timeline-list li .icon {
    color: var(--color-text-light);
}
.timeline-list li .info {
    flex-grow: 1;
}
.timeline-list li .info p {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 0;
}
.timeline-list li .info small {
    color: var(--color-text-light);
}
.timeline-list li .date {
    font-size: 0.9rem;
    color: var(--color-text-light);
    flex-shrink: 0;
}
.timeline-list li.completed .icon {
    color: var(--color-accent);
}
.timeline-list li.inprogress .icon {
    color: var(--color-primary);
}
.timeline-list li.locked {
    color: var(--color-locked);
}


/* * ===================================================================
 * 5. RESPONSIVENESS
 * ===================================================================
 */
@media (max-width: 1024px) {
    .sidebar {
        /* This is a simple mobile solution. A real one would use JS to toggle */
        width: var(--sidebar-width-collapsed);
    }
    .sidebar .logo {
        font-size: 1.2rem;
        text-align: center;
    }
    .sidebar .sidebar-nav span,
    .sidebar .sidebar-footer span,
    .sidebar .sidebar-header .logo {
        display: none; /* Hide text on smaller screens */
    }
    .sidebar-nav .nav-link,
    .sidebar-footer .nav-link {
        justify-content: center;
    }
    .page-content {
        margin-left: var(--sidebar-width-collapsed);
        width: calc(100% - var(--sidebar-width-collapsed));
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .card-next-lesson {
        grid-column: 1 / 2;
        grid-row: auto;
    }
    .lesson-layout {
        grid-template-columns: 1fr;
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
    .profile-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .page-content {
        padding: var(--space-3);
    }
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    .page-title {
        font-size: var(--font-size-xl);
    }
    .user-greeting {
        font-size: var(--font-size-base);
    }
    .card {
        padding: var(--space-3);
    }
    .modal {
        width: calc(100% - var(--space-4));
        padding: var(--space-3);
    }
    .modal-body {
        padding-top: var(--space-4);
    }
    
    .resource-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    .resource-list li .btn {
        margin-left: 0;
        margin-top: var(--space-2);
        width: 100%;
    }
}