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

:root {
    --primary-main: #4ECDC4;
    --primary-dark: #26A69A;
    --primary-light: #B2EBF2;
    --secondary-main: #64B5F6;
    --accent-pink: #FFCCD5;
    --bg-gradient: linear-gradient(135deg, #E0F7FA 0%, #F0F9FF 100%);
    --card-bg: #FFFFFF;
    --text-main: #2C3E50;
    --text-secondary: #546E7A;
    --border-color: #E0F2F1;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 999px;
    --shadow-sm: 0 2px 8px rgba(38, 166, 154, 0.08);
    --shadow-md: 0 4px 16px rgba(38, 166, 154, 0.12);
    --shadow-lg: 0 8px 24px rgba(38, 166, 154, 0.15);
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    line-height: 1.6;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    background: var(--card-bg);
    box-shadow: var(--shadow-lg);
}

/* ========== 侧边栏 ========== */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, var(--primary-dark) 0%, var(--primary-main) 100%);
    color: white;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    text-align: center;
    margin-bottom: 16px;
}

.sidebar-logo {
    width: 70px;
    height: 70px;
    background: white;
    border-radius: var(--radius-full);
    padding: 6px;
    margin: 0 auto 12px;
    animation: float 3s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.sidebar-header h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.sidebar-header p {
    font-size: 13px;
    opacity: 0.9;
}

/* 学习统计面板 */
.stats-panel {
    display: flex;
    justify-content: space-around;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    padding: 12px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 2px;
}

.stat-label {
    font-size: 11px;
    opacity: 0.9;
}

.main-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.nav-item {
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-align: left;
    font-size: 15px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(4px);
}

.nav-item.active {
    background: white;
    color: var(--primary-dark);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.nav-icon {
    font-size: 18px;
}

.session-list {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding: 0 4px;
}

.session-header span {
    font-size: 14px;
    opacity: 0.9;
}

.session-tools {
    display: flex;
    gap: 8px;
}

.new-session-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s;
}

.new-session-btn:hover {
    background: white;
    color: var(--primary-dark);
}

.session-container {
    flex: 1;
    overflow-y: auto;
}

.session-item {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-bottom: 4px;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.session-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.session-item.active {
    background: white;
    color: var(--primary-dark);
    font-weight: 500;
}

.session-name {
    font-size: 14px;
    flex: 1;
}

.session-delete {
    width: 20px;
    height: 20px;
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: 16px;
    cursor: pointer;
    border-radius: 4px;
    line-height: 1;
    opacity: 0;
    transition: all 0.2s;
}

.session-item:hover .session-delete {
    opacity: 1;
}

.session-delete:hover {
    background: rgba(255, 0, 0, 0.2);
    color: white;
}

.session-item.active .session-delete {
    color: var(--text-secondary);
}

.sidebar-footer {
    margin-top: auto;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-avatar {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: var(--radius-full);
    padding: 3px;
    margin-bottom: 8px;
}

.sidebar-footer p {
    font-size: 12px;
    opacity: 0.9;
}

/* ========== 主内容区 ========== */
.main-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.view {
    display: none;
    height: 100%;
    flex-direction: column;
}

.view.active {
    display: flex;
}

/* ========== 聊天模块 ========== */
.chat-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 24px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding-right: 8px;
    margin-bottom: 20px;
}

.welcome-card {
    text-align: center;
    padding: 40px 20px;
}

.welcome-avatar {
    width: 120px;
    height: 160px;
    margin-bottom: 16px;
    animation: bounce 2s infinite ease-in-out;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.welcome-card h2 {
    font-size: 24px;
    color: var(--text-main);
    margin-bottom: 8px;
}

.welcome-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.welcome-functions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.func-card {
    padding: 10px 18px;
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
}

/* 快捷提问 */
.quick-questions {
    margin-top: 24px;
}

.qq-title {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.qq-list {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.qq-item {
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: var(--radius-full);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.qq-item:hover {
    border-color: var(--primary-main);
    color: var(--primary-dark);
    background: var(--primary-light);
}

.chat-message {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    animation: slideIn 0.3s ease-out;
}

.chat-message.assistant {
    flex-direction: row;
}

.chat-message.user {
    flex-direction: row-reverse;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    overflow: hidden;
}

.msg-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.chat-message.user .msg-avatar {
    background: var(--secondary-main);
    color: white;
}

.msg-bubble {
    max-width: 70%;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 16px 18px;
    box-shadow: var(--shadow-sm);
}

.chat-message.user .msg-bubble {
    background: linear-gradient(135deg, var(--primary-main), var(--primary-dark));
    color: white;
}

.msg-content {
    line-height: 1.7;
}

/* 思考动画 */
.thinking-text {
    color: var(--text-secondary);
}

.thinking-dots::after {
    content: '';
    animation: thinkingDots 1.5s steps(4, end) infinite;
}

@keyframes thinkingDots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* 打字机光标 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    background: var(--primary-main);
    margin-left: 2px;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.chat-input-box {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    padding: 16px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.chat-input-box:focus-within {
    border-color: var(--primary-main);
    box-shadow: 0 0 0 4px rgba(78, 205, 196, 0.1);
}

.chat-input-box textarea {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-size: 15px;
    max-height: 120px;
    font-family: inherit;
}

.input-tools {
    display: flex;
    gap: 8px;
}

.tool-btn {
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover {
    border-color: var(--primary-main);
    color: var(--primary-dark);
}

.send-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-main), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========== 测评模块 ========== */
.exam-container {
    height: 100%;
    overflow-y: auto;
    padding: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.exam-step {
    display: none;
}

.exam-step.active {
    display: block;
}

.gen-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding: 24px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.gen-avatar {
    width: 70px;
    height: 70px;
    animation: float 3s infinite ease-in-out;
}

.gen-text h3 {
    font-size: 20px;
    margin-bottom: 4px;
}

.gen-text p {
    color: var(--text-secondary);
}

.gen-settings {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
}

.setting-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    outline: none;
    transition: all 0.3s;
}

.setting-group input:focus {
    border-color: var(--primary-main);
}

.difficulty-group {
    display: flex;
    gap: 16px;
}

.difficulty-item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}

.difficulty-item:hover {
    border-color: var(--primary-main);
}

.difficulty-item:has(input:checked) {
    border-color: var(--primary-main);
    background: var(--primary-light);
}

.difficulty-item input {
    display: none;
}

.btn-primary {
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--primary-main), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-full {
    width: 100%;
    padding: 16px;
    font-size: 16px;
}

.btn-secondary {
    padding: 12px 20px;
    background: white;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.question-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 24px;
}

.question-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-main));
    color: white;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.question-header h3 {
    font-size: 18px;
}

.question-tools-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dim-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.dim-badge {
    font-size: 12px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-weight: 500;
}

.favorite-btn {
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    transition: transform 0.2s;
}

.favorite-btn:hover {
    transform: scale(1.2);
}

.question-body {
    padding: 24px;
}

.question-material {
    background: var(--bg-gradient);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    line-height: 1.8;
}

.question-content {
    line-height: 1.8;
    font-weight: 500;
}

.question-tools {
    padding: 0 24px 12px;
}

.hint-box {
    margin: 0 24px 24px;
    padding: 16px;
    background: #FFF8E1;
    border-left: 4px solid #FFB74D;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: #E65100;
}

.answer-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.answer-card h4 {
    margin-bottom: 12px;
    color: var(--text-main);
}

.answer-card textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    outline: none;
    resize: vertical;
    margin-bottom: 16px;
    font-family: inherit;
    transition: all 0.3s;
}

.answer-card textarea:focus {
    border-color: var(--primary-main);
}

.answer-tools {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* 你的答案卡片 */
.your-answer-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.your-answer-card h4 {
    margin-bottom: 12px;
    color: var(--text-main);
}

.your-answer-content {
    padding: 16px;
    background: var(--bg-gradient);
    border-radius: var(--radius-md);
    line-height: 1.7;
}

.report-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.report-avatar {
    width: 60px;
    height: 60px;
}

.report-header h3 {
    font-size: 20px;
}

.report-header p {
    color: var(--text-secondary);
}

.report-grid {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.chart-card, .eval-card, .suggestions-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.chart-card h3, .eval-card h3, .suggestions-card h3 {
    margin-bottom: 16px;
    font-size: 18px;
}

.chart-container {
    position: relative;
    height: 300px;
}

.total-score {
    text-align: center;
    margin-top: 16px;
    font-size: 16px;
}

.total-score strong {
    font-size: 28px;
    color: var(--primary-dark);
}

.eval-text {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.sw-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.sw-box {
    padding: 16px;
    border-radius: var(--radius-md);
}

.sw-box h4 {
    font-size: 14px;
    margin-bottom: 8px;
}

.sw-box ul {
    padding-left: 18px;
    font-size: 14px;
    color: var(--text-secondary);
}

.sw-box.strengths {
    background: #F0FDF4;
    border: 1px solid #BBF7D0;
}

.sw-box.strengths h4 {
    color: #166534;
}

.sw-box.weaknesses {
    background: #FFFBEB;
    border: 1px solid #FED7AA;
}

.sw-box.weaknesses h4 {
    color: #92400E;
}

.suggestions-list {
    list-style: none;
    padding: 0;
}

.suggestions-list li {
    padding: 12px 16px;
    background: var(--primary-light);
    border-left: 4px solid var(--primary-main);
    margin-bottom: 10px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--primary-dark);
}

.variant-box {
    margin-top: 24px;
    text-align: center;
}

.variant-box h4 {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.variant-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== 学习中心 ========== */
.study-container {
    height: 100%;
    overflow-y: auto;
    padding: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.study-header {
    margin-bottom: 20px;
}

.study-header h2 {
    font-size: 24px;
    margin-bottom: 4px;
}

.study-header p {
    color: var(--text-secondary);
}

.study-nav {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.study-nav-item {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.study-nav-item:hover {
    border-color: var(--primary-main);
}

.study-nav-item.active {
    border-color: var(--primary-main);
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 500;
}

.study-tab {
    display: none;
}

.study-tab.active {
    display: block;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-avatar {
    width: 100px;
    height: 100px;
    margin-bottom: 16px;
    opacity: 0.8;
}

.empty-state p {
    color: var(--text-secondary);
}

.wrong-question-card, .favorite-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.wq-header, .fav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.wq-topic, .fav-topic {
    font-weight: 600;
    color: var(--primary-dark);
}

.wq-score {
    font-size: 14px;
    color: var(--text-secondary);
}

.wq-delete {
    padding: 6px 12px;
    background: #FFEBEE;
    border: none;
    color: #C62828;
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
}

.wq-content, .fav-content {
    padding: 12px;
    background: var(--bg-gradient);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
}

.wq-content > div, .fav-content > div {
    margin-bottom: 8px;
    font-size: 14px;
}

.wq-time, .fav-time {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: right;
}

/* ========== 模态框 ========== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    width: 90%;
    max-width: 600px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    animation: popIn 0.3s ease;
}

.large-modal {
    max-width: 800px;
}

@keyframes popIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    background: var(--primary-dark);
    color: white;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
    line-height: 1.8;
}

/* ========== Toast提示 ========== */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 12px 24px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 10000;
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.info {
    border-left: 4px solid var(--primary-main);
}

.toast.success {
    border-left: 4px solid #4CAF50;
}

.toast.warning {
    border-left: 4px solid #FF9800;
}

.toast.error {
    border-left: 4px solid #F44336;
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-main);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        padding: 12px 16px;
    }
    .sidebar-header {
        margin-bottom: 12px;
    }
    .sidebar-logo {
        width: 50px;
        height: 50px;
    }
    .sidebar-header h2 {
        font-size: 18px;
    }
    .sidebar-header p, .sidebar-footer, .session-list {
        display: none;
    }
    .main-nav {
        flex-direction: row;
    }
    .nav-item {
        justify-content: center;
    }
    .msg-bubble {
        max-width: 85%;
    }
    .report-grid {
        grid-template-columns: 1fr;
    }
    .sw-wrapper {
        grid-template-columns: 1fr;
    }
    .gen-settings {
        padding: 16px;
    }
    .difficulty-group {
        flex-direction: column;
    }
    .answer-tools {
        flex-direction: column;
    }
    .answer-tools button {
        width: 100%;
    }
    .variant-btns {
        flex-direction: column;
    }
    .variant-btns button {
        width: 100%;
    }
    .study-nav {
        justify-content: center;
    }
}