:root {
    --navy-blue: #0B1F5B;
    --warm-yellow: #F2C94C;
    --soft-gray: #D9D9E6;
    --white: #ffffff;
    --dark-gray: #333333;
    --shadow: 0 10px 40px rgba(0,0,0,0.1);
    --shadow-hover: 0 15px 50px rgba(0,0,0,0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--soft-gray);
    color: var(--dark-gray);
}

/* Registration Page Split Screen */
.split-screen {
    display: flex;
    min-height: 100vh;
}

.left-side {
    flex: 1;
    background: url('/static/images/student.jpeg') center/cover no-repeat;
    position: relative;
}

.left-side::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(11,31,91,0.85), rgba(242,201,76,0.3));
}

.right-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    padding: 3rem;
    overflow-y: auto;
}

.form-container {
    max-width: 520px;
    width: 100%;
    padding: 1rem;
}

.logo {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo-img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 1.5rem;
    border: 3px solid var(--warm-yellow);
    box-shadow: var(--shadow);
}

.logo h1 {
    color: var(--navy-blue);
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo .subtitle {
    color: var(--warm-yellow);
    font-size: 1.2rem;
    letter-spacing: 3px;
    font-weight: 600;
    text-transform: uppercase;
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.logo .subtitle::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--warm-yellow);
    border-radius: 2px;
}

.form-group {
    margin-bottom: 1.8rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--navy-blue);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--soft-gray);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.form-group input:focus {
    outline: none;
    border-color: var(--warm-yellow);
    box-shadow: 0 0 0 4px rgba(242,201,76,0.2);
    transform: translateY(-1px);
}

.form-group input::placeholder {
    color: #bbb;
    font-size: 0.95rem;
}

.btn {
    width: 100%;
    padding: 14px;
    background: var(--warm-yellow);
    color: var(--navy-blue);
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    background: #e0b530;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--navy-blue);
    color: var(--white);
}

.btn-secondary:hover {
    background: #0d295c;
    transform: translateY(-2px);
}

.link {
    text-align: center;
    margin-top: 2rem;
}

.link a {
    color: var(--warm-yellow);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.link a:hover {
    color: var(--navy-blue);
    text-decoration: underline;
}

/* Login Page with Background */
.login-bg {
    background: url('/static/images/group.jpeg') center/cover no-repeat fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.login-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11,31,91,0.7);
}

.login-card {
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--shadow);
    max-width: 480px;
    width: 90%;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dashboard */
.dashboard-container {
    background: var(--soft-gray);
    min-height: 100vh;
}

.navbar {
    background: var(--white);
    padding: 1rem 2rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.navbar-brand img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--warm-yellow);
}

.navbar-brand h2 {
    color: var(--navy-blue);
    font-size: 1.3rem;
    font-weight: 600;
}

.navbar-brand span {
    color: var(--warm-yellow);
    font-weight: 500;
    font-size: 0.9rem;
}

.logout-btn {
    background: var(--warm-yellow);
    color: var(--navy-blue);
    padding: 0.6rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: #e0b530;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.main-content {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.welcome-card {
    background: linear-gradient(135deg, var(--navy-blue), var(--warm-yellow));
    color: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.5s ease-out;
}

.welcome-card h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.welcome-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.progress-section {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.progress-section h3 {
    color: var(--navy-blue);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.progress-bar-container {
    background: var(--soft-gray);
    border-radius: 15px;
    height: 35px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-bar-fill {
    background: linear-gradient(90deg, var(--warm-yellow), #f7dc6f);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--navy-blue);
    font-weight: bold;
    transition: width 0.5s ease;
    font-size: 0.9rem;
}

/* TWO COLUMN LAYOUT - Playlists on Left, Referral on Right */
.two-column-layout {
    display: flex;
    gap: 2rem;
    width: 100%;
}

.playlists-column {
    flex: 2;
    min-width: 0;
}

.referral-column {
    flex: 1;
    min-width: 280px;
}

.playlist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.playlist-card {
    background: var(--white);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.playlist-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.playlist-card.locked {
    opacity: 0.8;
    background: #f8f9fa;
}

.playlist-card h3 {
    color: var(--navy-blue);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.unlock-btn {
    background: var(--warm-yellow);
    color: var(--navy-blue);
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 0.9rem;
}

.unlock-btn:hover {
    background: #e0b530;
    transform: translateY(-2px);
}

/* Referral Card */
.referral-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    position: sticky;
    top: 20px;
    transition: transform 0.3s ease;
}

.referral-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.referral-img-area {
    background: linear-gradient(135deg, #FF6B35, #F7931E);
    padding: 1.5rem;
    text-align: center;
}

.referral-img-area img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 12px;
    border: 3px solid white;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.referral-info-area {
    padding: 1.2rem;
}

.earn-badge {
    background: linear-gradient(135deg, #FF6B35, #F7931E);
    color: white;
    display: inline-block;
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: bold;
    margin-bottom: 0.8rem;
}

.referral-info-area h3 {
    color: var(--navy-blue);
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
    font-weight: 800;
}

.referral-info-area p {
    color: #666;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.name-card {
    background: #f8f9fa;
    padding: 0.8rem;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 1rem;
    border: 1px dashed var(--warm-yellow);
}

.name-card small {
    color: #888;
    font-size: 0.6rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.student-name {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--navy-blue);
    margin: 0.3rem 0;
    word-break: break-word;
}

.copy-btn-sm {
    background: var(--warm-yellow);
    color: var(--navy-blue);
    border: none;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.copy-btn-sm:hover {
    background: #e0b530;
    transform: scale(1.05);
}

.steps {
    margin-top: 0.8rem;
}

.step {
    font-size: 0.75rem;
    padding: 0.4rem 0;
    color: #555;
    border-bottom: 1px solid #eee;
}

.step:last-child {
    border-bottom: none;
}

/* Lesson Detail Page */
.lesson-list {
    background: var(--white);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.lesson-list h2 {
    color: var(--navy-blue);
    margin-bottom: 1.5rem;
}

.lesson-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--soft-gray);
    transition: all 0.3s ease;
}

.lesson-item:hover {
    background: rgba(242,201,76,0.05);
    padding-left: 1.2rem;
}

.lesson-item.completed {
    background: linear-gradient(90deg, #e8f5e9, transparent);
    border-radius: 10px;
}

.completed-badge {
    color: #4caf50;
    font-weight: bold;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 16px;
}

.back-btn {
    background: var(--navy-blue);
    color: var(--white);
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: #0d295c;
    transform: translateX(-3px);
}

/* Messages */
.message {
    padding: 1rem 1.5rem;
    margin: 1rem;
    border-radius: 12px;
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    box-shadow: var(--shadow);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.message.success {
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
}

.message.error {
    background: linear-gradient(135deg, #f44336, #da190b);
    color: white;
}

.message.warning {
    background: linear-gradient(135deg, var(--warm-yellow), #e0b530);
    color: var(--navy-blue);
}

.message.info {
    background: linear-gradient(135deg, var(--navy-blue), #0d295c);
    color: white;
}

/* Form validation styles */
.error-message {
    color: #f44336 !important;
    font-size: 0.8rem;
    margin-top: 0.3rem;
    padding: 0.3rem 0;
    animation: fadeInUp 0.3s ease-out;
}

input.error {
    border-color: #f44336 !important;
    background-color: #ffebee !important;
}

input.error:focus {
    border-color: #f44336 !important;
    box-shadow: 0 0 0 4px rgba(244, 67, 54, 0.1) !important;
}

.password-strength {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.password-hint, .code-hint {
    font-size: 0.7rem;
    color: #666;
    display: block;
    margin-top: 0.3rem;
}

input.valid {
    border-color: #4caf50;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

input.error {
    animation: shake 0.3s ease-in-out;
}

/* Responsive Design */
@media (max-width: 968px) {
    .split-screen {
        flex-direction: column;
    }
    .left-side {
        min-height: 250px;
    }
    .right-side {
        padding: 2rem;
    }
    .form-container {
        max-width: 100%;
    }
    .logo h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 900px) {
    .two-column-layout {
        flex-direction: column;
    }
    
    .referral-card {
        position: static;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .referral-img-area img {
        max-width: 150px;
    }
    
    .playlist-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    .navbar-brand {
        flex-direction: column;
        text-align: center;
    }
    .main-content {
        padding: 1rem;
    }
    .welcome-card h1 {
        font-size: 1.5rem;
    }
    .message {
        top: 10px;
        right: 10px;
        left: 10px;
    }
}

@media (max-width: 600px) {
    .playlist-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 2rem;
        width: 95%;
    }
    .form-group input {
        padding: 12px;
    }
    .btn {
        padding: 12px;
    }
}

/* Message container styles */
#message-container {
    position: fixed;
    top: 20px;
    right: 20px;
    left: 20px;
    z-index: 9999;
    pointer-events: none;
}

.message {
    position: relative;
    padding: 15px 35px 15px 20px;
    margin-bottom: 10px;
    border-radius: 8px;
    animation: slideIn 0.3s ease-out;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    pointer-events: auto;
    word-wrap: break-word;
    white-space: normal;
}

@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;
    }
}

.message-close {
    position: absolute;
    right: 10px;
    top: 10px;
    background: none;
    border: none;
    color: inherit;
    font-size: 20px;
    cursor: pointer;
    pointer-events: auto;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.message-close:hover {
    opacity: 1;
}

/* Mobile responsive */
@media (max-width: 768px) {
    #message-container {
        top: 10px;
        right: 10px;
        left: 10px;
    }
    
    .message {
        margin-left: 0;
        margin-right: 0;
        font-size: 13px;
        padding: 12px 30px 12px 15px;
    }
    
    .message-close {
        font-size: 18px;
        right: 8px;
        top: 8px;
    }
}

.message.success {
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
}

.message.error {
    background: linear-gradient(135deg, #f44336, #da190b);
    color: white;
}

.message.warning {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
}

.message.info {
    background: linear-gradient(135deg, var(--navy-blue), #0d295c);
    color: white;
}

/* Add to the end of your style.css file */

/* Mobile Navbar Fix - Adds extra padding on mobile */
@media (max-width: 768px) {
    .navbar {
        padding: 0.5rem 1rem !important;
        flex-direction: column !important;
        gap: 0.5rem !important;
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        z-index: 1000 !important;
        background: white !important;
        box-shadow: 0 2px 15px rgba(0,0,0,0.1) !important;
    }
    
    .navbar-brand {
        width: 100% !important;
        justify-content: center !important;
    }
    
    .navbar-brand h2 {
        font-size: 0.9rem !important;
        text-align: center !important;
    }
    
    .navbar-brand h2 span {
        display: none !important;
    }
    
    .navbar-brand img {
        width: 35px !important;
        height: 35px !important;
    }
    
    .navbar > div:last-child {
        width: 100% !important;
        justify-content: center !important;
        flex-wrap: wrap !important;
        gap: 8px !important;
    }
    
    .logout-btn {
        padding: 0.3rem 0.8rem !important;
        font-size: 0.8rem !important;
    }
    
    .navbar span[style*="color: var(--navy-blue)"] {
        font-size: 0.8rem !important;
    }
    
    /* Increase padding-top for all pages with fixed navbar */
    .main-content {
        padding-top: 130px !important;
    }
    
    /* Extra padding for pages with multiple navbar rows */
    .dashboard-container .main-content {
        padding-top: 140px !important;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding-top: 150px !important;
    }
    
    .dashboard-container .main-content {
        padding-top: 160px !important;
    }
}


/* ============ COURSE OUTLINE — BOOK-CATALOG TREE STYLE ============ */
.outline-section {
    background: var(--white);
    padding: 1.8rem 2.2rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    width: 100%;
}

.outline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.outline-header h3 {
    color: var(--navy-blue);
    font-size: 1.35rem;
    font-weight: 700;
}

.outline-chevron {
    color: var(--navy-blue);
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.outline-chevron.open {
    transform: rotate(180deg);
}

.outline-body {
    margin-top: 1.3rem;
    border-top: 1px solid var(--soft-gray);
    padding-top: 1.2rem;
    width: 100%;
}

/* --- top-level course node --- */
.outline-course-title {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--soft-gray);
    padding: 0.8rem 1.1rem;
    border-radius: 10px;
    font-weight: 700;
    color: var(--navy-blue);
    font-size: 1.05rem;
    cursor: pointer;
    margin-bottom: 0.4rem;
    margin-top: 1rem;
}

/* --- tree wrapper: vertical guide line running down the left, like a book index --- */
.outline-tree {
    position: relative;
    margin-left: 14px;
    padding-left: 22px;
    border-left: 2px dashed var(--soft-gray);
}

.outline-lessons.outline-tree {
    border-left: 2px dashed #f0d97a;
}

/* --- each playlist "chapter" row --- */
.outline-playlist {
    position: relative;
    margin: 0.6rem 0;
}

/* horizontal branch connecting the vertical guide to this row */
.outline-playlist::before {
    content: '';
    position: absolute;
    left: -22px;
    top: 18px;
    width: 22px;
    height: 2px;
    background: var(--soft-gray);
}

.outline-playlist-header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    cursor: pointer;
    padding: 0.5rem 0.4rem;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.outline-playlist-header:hover {
    background: #f8f9fa;
}

.outline-playlist-name {
    font-weight: 600;
    color: var(--navy-blue);
    font-size: 1rem;
}

/* dotted "book index" leader line between title and count */
.outline-connector {
    flex: 1 1 40px;
    border-bottom: 1px dotted #ccc;
    height: 0;
    align-self: center;
    min-width: 20px;
}

.outline-count {
    color: #888;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.outline-chevron-sm {
    font-size: 0.75rem;
    color: #aaa;
    margin-left: 4px;
}

/* --- lesson "page" rows --- */
.outline-lesson {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    padding: 0.45rem 0.4rem;
    font-size: 0.95rem;
    color: #444;
    line-height: 1.4;
}

.outline-lesson::before {
    content: '';
    position: absolute;
    left: -22px;
    top: 17px;
    width: 22px;
    height: 2px;
    background: #f0d97a;
}

.outline-lesson-name {
    word-break: break-word;
}

.outline-lesson.completed .outline-lesson-name {
    color: #2e7d32;
}

.outline-status {
    color: #2e7d32;
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
}

.outline-lesson-empty {
    font-size: 0.88rem;
    color: #999;
    font-style: italic;
    padding: 0.4rem 0;
}

.outline-node-icon {
    flex-shrink: 0;
}

.outline-goto-wrap {
    margin: 0.5rem 0 0.8rem 0;
}

.outline-goto-btn {
    display: inline-block;
    background: var(--warm-yellow);
    color: var(--navy-blue);
    padding: 0.4rem 0.9rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
}

@media (max-width: 768px) {
    .outline-section {
        padding: 1.3rem;
    }
    .outline-tree {
        margin-left: 8px;
        padding-left: 16px;
    }
    .outline-playlist::before,
    .outline-lesson::before {
        left: -16px;
        width: 16px;
    }
}