@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Ma+Shan+Zheng&family=Zhi+Mang+Xing&family=Orbitron:wght@400;700;900&family=Dancing+Script:wght@400;700&display=swap');

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: #333;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    text-size-adjust: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    max-width: 100vw;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@media (max-width: 768px) {
    body {
        background-attachment: scroll;
    }
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100vw;
    overflow-x: hidden;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22.5px 45px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.title {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 47.25px;
    color: #4a54d1;
    font-weight: 700;
}

.controls {
    display: flex;
    gap: 25.5px;
    align-items: center;
}

.btn {
    background: #4a54d1;
    color: white;
    border: none;
    padding: 8.25px 17.25px;
    border-radius: 21px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6.75px;
}

.btn:hover {
    background: #3a44c1;
    transform: translateY(-3.75px);
    box-shadow: 0 8.25px 25.5px rgba(74, 84, 209, 0.3);
}

.slide-counter {
    background: rgba(74, 84, 209, 0.1);
    padding: 13.5px 27px;
    border-radius: 33.75px;
    font-weight: 500;
    color: #4a54d1;
    order: 1;
}

#nextBtn {
    order: 2;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: row;
}

.slide-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 67.5px;
    min-width: 0;
}

.slide {
    background: white;
    border-radius: 33.75px;
    padding: 101.25px;
    max-width: 1518.75px;
    width: 100%;
    min-height: 843.75px;
    box-shadow: 0 33.75px 101.25px rgba(0,0,0,0.1);
    display: none;
    position: relative;
    overflow: hidden;
}

.slide.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8.25px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.slide-icon {
    font-size: 135px;
    margin-bottom: 51px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.slide h1 {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 81px;
    color: #4a54d1;
    margin-bottom: 33.75px;
    text-shadow: 3.75px 3.75px 6.75px rgba(0,0,0,0.1);
}

.slide h2 {
    font-family: 'Zhi Mang Xing', serif;
    font-size: 60.75px;
    color: #667eea;
    margin-bottom: 42px;
    font-weight: 400;
}

.slide h3 {
    font-size: 40.5px;
    color: #764ba2;
    margin-bottom: 33.75px;
    font-weight: 600;
}

.slide p {
    font-size: 30.75px;
    line-height: 1.8;
    color: #555;
    margin-bottom: 25.5px;
    max-width: 1181.25px;
}

.highlight {
    background: linear-gradient(135deg, #667eea20, #764ba220);
    padding: 5.25px 13.5px;
    border-radius: 8.25px;
    font-weight: 600;
    color: #4a54d1;
}

.emphasis {
    font-size: 47.25px;
    font-weight: 700;
    color: #764ba2;
    text-shadow: 1.5px 1.5px 5.25px rgba(0,0,0,0.1);
}

.script-area {
    background: rgba(255, 255, 255, 0.95);
    border-left: 5.25px solid #4a54d1;
    padding: 33.75px;
    width: 675px;
    overflow-y: auto;
    transition: all 0.3s ease;
    flex-shrink: 0;
}


.script-content {
    font-size: 24px;
    line-height: 1.6;
    color: #666;
}

.script-title {
    font-weight: 700;
    color: #4a54d1;
    margin-bottom: 17.25px;
    display: flex;
    align-items: center;
    gap: 17.25px;
}


.quote {
    font-style: italic;
    font-size: 33.75px;
    color: #764ba2;
    border-left: 6.75px solid #667eea;
    padding-left: 33.75px;
    margin: 33.75px 0;
    background: rgba(102, 126, 234, 0.05);
    padding: 33.75px;
    border-radius: 17.25px;
}

.key-points {
    text-align: left;
    max-width: 1012.5px;
}

.key-points ul {
    list-style: none;
    padding: 0;
}

.key-points li {
    margin: 25.5px 0;
    padding: 25.5px 33.75px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 17.25px;
    border-left: 6.75px solid #667eea;
    font-size: 27px;
    position: relative;
}

.key-points li::before {
    content: '✦';
    color: #667eea;
    font-weight: bold;
    position: absolute;
    left: -3.75px;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(84.75px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide.active {
    animation: slideIn 0.5s ease-out;
}

/* Mobile First - Base styles for mobile devices */
@media (max-width: 480px) {
    body {
        font-size: 14px;
        overflow-y: auto;
        position: relative;
        -webkit-text-size-adjust: none;
        -moz-text-size-adjust: none;
        text-size-adjust: none;
    }

    .container {
        height: auto;
        overflow: visible;
    }

    .header {
        padding: 11.25px 17.25px;
        flex-wrap: wrap;
        gap: 11.25px;
    }

    .title {
        font-size: 22.5px;
        order: 1;
        flex: 1;
        text-align: left;
    }

    .controls {
        order: 2;
        width: 100%;
        justify-content: space-between;
        gap: 9px;
        flex-wrap: wrap;
    }

    .btn {
        padding: 9px 12px;
        font-size: 10.5px;
        min-height: 33px;
        border-radius: 16.5px;
    }

    .slide-counter {
        padding: 6px 9px;
        font-size: 10.5px;
        border-radius: 15px;
    }

    .slide-area {
        padding: 22.5px 17.25px;
    }

    .slide {
        padding: 33.75px 22.5px;
        border-radius: 17.25px;
        min-height: auto;
    }

    .slide-icon {
        font-size: 67.5px;
        margin-bottom: 22.5px;
    }

    .slide h1 {
        font-size: 31.5px;
        margin-bottom: 17.25px;
    }

    .slide h2 {
        font-size: 24.75px;
        margin-bottom: 17.25px;
    }

    .slide h3 {
        font-size: 20.25px;
        margin-bottom: 13.5px;
    }

    .slide p {
        font-size: 18px;
        line-height: 1.6;
        margin-bottom: 13.5px;
    }

    .emphasis {
        font-size: 22.5px;
    }

    .quote {
        font-size: 20.25px;
        padding: 17.25px;
        margin: 17.25px 0;
        border-radius: 9px;
    }

    .key-points li {
        margin: 13.5px 0;
        padding: 17.25px 22.5px;
        font-size: 18px;
        border-radius: 11.25px;
    }

    .script-area {
        width: 100%;
        border-left: none;
        border-top: 3.75px solid #4a54d1;
        padding: 17.25px;
        height: auto;
    }

    .script-content {
        font-size: 18px;
        line-height: 1.5;
		margin-bottom: 100px;
    }

    .script-title {
        font-size: 18px;
        margin-bottom: 11.25px;
        gap: 11.25px;
    }

    .main-content {
        flex-direction: column;
        flex: none;
        height: auto;
        min-height: 100vh;
    }
}

/* Small tablets and large phones */
@media (min-width: 481px) and (max-width: 768px) {
    .header {
        padding: 17.25px 22.5px;
        flex-wrap: wrap;
        gap: 17.25px;
    }

    .title {
        font-size: 31.5px;
    }

    .btn {
        padding: 7.5px 13.5px;
        font-size: 11.25px;
        min-height: 36px;
    }

    .slide-area {
        padding: 33.75px 22.5px;
    }

    .slide {
        padding: 56.25px 33.75px;
        border-radius: 22.5px;
    }

    .slide-icon {
        font-size: 90px;
        margin-bottom: 28.5px;
    }

    .slide h1 {
        font-size: 40.5px;
        margin-bottom: 22.5px;
    }

    .slide h2 {
        font-size: 33.75px;
        margin-bottom: 22.5px;
    }

    .slide h3 {
        font-size: 27px;
        margin-bottom: 18px;
    }

    .slide p {
        font-size: 20.25px;
        line-height: 1.7;
        margin-bottom: 18px;
    }

    .emphasis {
        font-size: 27px;
    }

    .quote {
        font-size: 22.5px;
        padding: 22.5px;
        margin: 22.5px 0;
    }

    .key-points li {
        margin: 18px 0;
        padding: 20.25px 28.5px;
        font-size: 20.25px;
    }

    .script-area {
        width: 100%;
        border-left: none;
        border-top: 4.5px solid #4a54d1;
        padding: 22.5px;
        height: auto;
    }

    .script-content {
        font-size: 20.25px;
    }

    .main-content {
        flex-direction: column;
        flex: none;
        height: auto;
        min-height: 100vh;
    }
}

/* Tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    .header {
        padding: 20.25px 33.75px;
    }

    .title {
        font-size: 36px;
    }

    .btn {
        padding: 9px 18px;
        font-size: 12.75px;
    }

    .slide-area {
        padding: 45px 28.5px;
    }

    .slide {
        padding: 67.5px 45px;
        border-radius: 28.5px;
    }

    .slide-icon {
        font-size: 101.25px;
        margin-bottom: 33.75px;
    }

    .slide h1 {
        font-size: 54px;
        margin-bottom: 24.75px;
    }

    .slide h2 {
        font-size: 40.5px;
        margin-bottom: 28.5px;
    }

    .slide h3 {
        font-size: 31.5px;
        margin-bottom: 22.5px;
    }

    .slide p {
        font-size: 22.5px;
        line-height: 1.7;
        margin-bottom: 20.25px;
    }

    .emphasis {
        font-size: 31.5px;
    }

    .quote {
        font-size: 24.75px;
        padding: 28.5px;
        margin: 28.5px 0;
    }

    .key-points li {
        margin: 20.25px 0;
        padding: 22.5px 31.5px;
        font-size: 22.5px;
    }

    .script-area {
        width: 393.75px;
        padding: 28.5px;
    }

    .script-content {
        font-size: 21.75px;
    }

    .main-content {
        flex-direction: row;
    }
}

/* Small desktops */
@media (min-width: 1025px) and (max-width: 1366px) {
    .header {
        padding: 22.5px 39.75px;
    }

    .title {
        font-size: 40.5px;
    }

    .slide-area {
        padding: 56.25px 39.75px;
    }

    .slide {
        padding: 78.75px 56.25px;
    }

    .slide-icon {
        font-size: 112.5px;
        margin-bottom: 39.75px;
    }

    .slide h1 {
        font-size: 65.25px;
        margin-bottom: 28.5px;
    }

    .slide h2 {
        font-size: 49.5px;
        margin-bottom: 33.75px;
    }

    .slide h3 {
        font-size: 33.75px;
        margin-bottom: 27px;
    }

    .slide p {
        font-size: 24.75px;
        line-height: 1.75;
        margin-bottom: 22.5px;
    }

    .emphasis {
        font-size: 36px;
    }

    .quote {
        font-size: 27px;
        padding: 28.5px;
        margin: 28.5px 0;
    }

    .key-points li {
        margin: 22.5px 0;
        padding: 22.5px 31.5px;
        font-size: 24.75px;
    }

    .script-area {
        width: 450px;
        padding: 31.5px;
    }

    .script-content {
        font-size: 22.5px;
    }
}

/* Large desktops */
@media (min-width: 1367px) and (max-width: 1536px) {
    .script-area {
        width: 506.25px;
    }
}

/* Extra large desktops */
@media (min-width: 1537px) {
    .script-area {
        width: 675px;
    }
}

/* Landscape orientation adjustments for mobile/tablet */
@media (max-width: 1024px) and (orientation: landscape) {
    .slide-area {
        padding: 22.5px 17.25px;
    }

    .slide {
        padding: 33.75px 28.5px;
        min-height: auto;
    }

    .slide-icon {
        font-size: 56.25px;
        margin-bottom: 17.25px;
    }

    .slide h1 {
        font-size: 36px;
        margin-bottom: 17.25px;
    }

    .slide h2 {
        font-size: 27px;
        margin-bottom: 13.5px;
    }

    .slide p {
        font-size: 18px;
        margin-bottom: 13.5px;
    }

    .script-area {
        height: auto;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .btn {
        border: 0.5625px solid rgba(255,255,255,0.3);
    }
}

/* Tim 学院 Logo */
.tim-logo {
    position: fixed;
    bottom: 30px;
    left: 30px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.85) 100%);
    padding: 10px 13px;
    border-radius: 13px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    animation: logoFloat 3s ease-in-out infinite alternate;
    text-decoration: none;
}

.tim-logo:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.25), 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

.logo-icon {
    width: 25px;
    height: 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #4a54d1 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: bold;
    box-shadow: 0 3px 8px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.logo-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.3) 50%, transparent 70%);
    transform: rotate(45deg);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    50% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-tim {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    font-weight: 900;
    background: linear-gradient(135deg, #4a54d1 0%, #667eea 50%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.logo-academy {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 16px;
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0.5px 0.5px 1.5px rgba(0, 0, 0, 0.1);
    font-weight: 400;
}

/* Mobile responsive for logo */
@media (max-width: 480px) {
    .tim-logo {
        bottom: 15px;
        left: 15px;
        padding: 8px 9px;
        border-radius: 10px;
        gap: 5px;
    }

    .logo-icon {
        width: 20px;
        height: 20px;
        font-size: 9px;
    }

    .logo-tim {
        font-size: 7.5px;
        letter-spacing: 0.5px;
    }

    .logo-academy {
        font-size: 9px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .tim-logo {
        bottom: 20px;
        left: 20px;
        padding: 9px 11px;
    }

    .logo-icon {
        width: 23px;
        height: 23px;
        font-size: 10px;
    }

    .logo-tim {
        font-size: 12px;
        letter-spacing: 0.75px;
    }

    .logo-academy {
        font-size: 13px;
    }
}

/* =======================================================
   INDEX.HTML STYLES - Scoped to .homepage only
   ======================================================= */

.homepage .header {
    backdrop-filter: blur(10px);
}

.homepage .title {
    display: flex;
    align-items: center;
    gap: 17.25px;
}

.homepage .navigation {
    display: none;
}

.homepage .main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 67.5px;
    min-width: 0;
    width: 100%;
    max-width: 100vw;
    box-sizing: border-box;
}

.homepage .hero-section {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 33.75px;
    padding: 30px 101.25px 101.25px 101.25px;
    max-width: 1800px;
    width: 100%;
    box-shadow: 0 33.75px 101.25px rgba(0,0,0,0.15), 0 0 0 1px rgba(255, 255, 255, 0.2);
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 67.5px;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8.25px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.homepage .hero-icon {
    font-size: 135px;
    margin-bottom: 5px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.homepage .hero-title {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 96px;
    color: #4a54d1;
    margin-bottom: 33.75px;
    text-shadow: 3.75px 3.75px 6.75px rgba(0,0,0,0.1);
}

.homepage .hero-subtitle {
    font-family: 'Zhi Mang Xing', serif;
    font-size: 60.75px;
    color: #667eea;
    margin-bottom: 51px;
    font-weight: 400;
}

.homepage .hero-description {
    font-size: 30.75px;
    line-height: 1.8;
    color: #555;
    margin-bottom: 33.75px;
    max-width: 1350px;
}

.homepage .hero-quote {
    font-style: italic;
    font-size: 40.5px;
    color: #764ba2;
    border-left: 6.75px solid #667eea;
    padding-left: 33.75px;
    margin: 51px 0;
    background: rgba(102, 126, 234, 0.05);
    padding: 33.75px;
    border-radius: 17.25px;
    font-family: 'Dancing Script', cursive;
    font-weight: 700;
}

.homepage .toc-section {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 33.75px;
    padding: 67.5px 101.25px;
    max-width: 1800px;
    width: 100%;
    box-shadow: 0 33.75px 101.25px rgba(0,0,0,0.15), 0 0 0 1px rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.homepage .toc-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8.25px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.homepage .toc-title {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 54px;
    color: #4a54d1;
    margin-bottom: 51px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 25.5px;
}

.homepage .toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 51px;
    align-items: start;
}

/* Responsive grid adjustments */
@media (max-width: 1200px) {
    .homepage .toc-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 25px;
    }
}

@media (max-width: 900px) {
    .homepage .toc-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 600px) {
    .homepage .toc-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.homepage .chapter-group {
    background: rgba(102, 126, 234, 0.08);
    border-radius: 17.25px;
    padding: 33.75px;
    border-left: 6.75px solid #667eea;
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.homepage .chapter-group:hover {
    background: rgba(102, 126, 234, 0.12);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.2);
}

.homepage .group-title {
    font-size: 27px;
    color: #4a54d1;
    margin-bottom: 25.5px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 17.25px;
}

.homepage .chapter-list {
    list-style: none;
    padding: 0;
}

.homepage .chapter-item {
    margin: 17.25px 0;
    display: flex;
    align-items: center;
    gap: 13.5px;
}

/* Mobile: More compact chapter items */
@media (max-width: 480px) {
    .homepage .chapter-item {
        margin: 6px 0;
        gap: 4px;
    }
    
    .homepage .chapter-icon {
        font-size: 11px;
    }
    
    .homepage .chapter-title {
        line-height: 1.2;
        word-break: keep-all;
        overflow-wrap: break-word;
    }
}

.homepage .chapter-link {
    display: flex;
    align-items: center;
    gap: 13.5px;
    padding: 13.5px 25.5px;
    background: white;
    border-radius: 17.25px;
    text-decoration: none;
    color: #333;
    font-size: 18px;
    transition: all 0.3s ease;
    width: 100%;
    border: 1.5px solid transparent;
}

.homepage .chapter-link:hover {
    background: linear-gradient(135deg, #667eea15, #764ba215);
    border-color: #667eea;
    transform: translateX(6.75px) translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.25);
}

@media (hover: none) and (pointer: coarse) {
    .homepage .chapter-link:hover {
        transform: none;
    }
    
    .homepage .chapter-link:active {
        background: linear-gradient(135deg, #667eea15, #764ba215);
        transform: scale(0.98);
    }
}

.homepage .chapter-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6.75px 13.5px;
    border-radius: 13.5px;
    font-weight: 600;
    min-width: 67.5px;
    text-align: center;
}

.homepage .chapter-title {
    flex: 1;
    font-weight: 500;
}

.homepage .chapter-icon {
    font-size: 20.25px;
    color: #667eea;
}

.homepage .principles-section {
    text-align: left;
    margin-top: 51px;
    padding: 51px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 25.5px;
    border-left: 6.75px solid #4a54d1;
}

.homepage .principles-title {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 40.5px;
    color: #4a54d1;
    margin-bottom: 33.75px;
    text-align: center;
}

.homepage .principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 25.5px;
}

.homepage .principle-item {
    background: white;
    padding: 25.5px;
    border-radius: 17.25px;
    border-left: 4.5px solid #667eea;
    font-size: 18px;
    line-height: 1.6;
    display: flex;
    align-items: center;
    gap: 17.25px;
}

.homepage .principle-icon {
    font-size: 27px;
    color: #667eea;
    min-width: 40.5px;
    text-align: center;
}

/* Tim 学院 Logo */
.tim-logo {
    position: fixed;
    bottom: 30px;
    left: 30px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.85) 100%);
    padding: 10px 13px;
    border-radius: 13px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    animation: logoFloat 3s ease-in-out infinite alternate;
    text-decoration: none;
}

.tim-logo:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.25), 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

.logo-icon {
    width: 25px;
    height: 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #4a54d1 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: bold;
    box-shadow: 0 3px 8px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.logo-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.3) 50%, transparent 70%);
    transform: rotate(45deg);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    50% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-tim {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    font-weight: 900;
    background: linear-gradient(135deg, #4a54d1 0%, #667eea 50%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.logo-academy {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 16px;
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0.5px 0.5px 1.5px rgba(0, 0, 0, 0.1);
    font-weight: 400;
}

/* Extra small devices - phones in portrait */
@media (max-width: 320px) {
    .homepage .toc-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .homepage .chapter-group {
        padding: 15px;
    }
    
    .homepage .hero-section {
        padding: 20px 15px;
    }
    
    .homepage .toc-section {
        padding: 20px 15px;
    }
    
    .homepage .main-content {
        padding: 15px 10px;
    }
    
    .homepage .hero-title {
        font-size: 36px;
        line-height: 1.2;
        word-break: keep-all;
    }
    
    .homepage .hero-subtitle {
        font-size: 24px;
        line-height: 1.3;
    }
    
    .homepage .hero-description {
        font-size: 12px;
        line-height: 1;
    }
    
    .homepage .hero-quote {
        font-size: 16.5px;
        line-height: 1.4;
        padding: 15px;
        margin: 10px 0;
    }
	
    .script-content {
        font-size: 18px;
        line-height: 1.5;
		margin-bottom: 100px;
    }

}

/* Mobile First - Base styles for mobile devices */
@media (max-width: 480px) {
    .homepage .header {
        display: none;
    }

    .homepage .main-content {
        padding: 15px 10px;
    }

    .homepage .hero-section {
        padding: 10px 22px 20px 22px;
        margin-bottom: 20px;
    }

    .homepage .hero-title {
        font-size: 112px;
        margin-bottom: 25px;
        line-height: 1.2;
        word-break: keep-all;
    }

    .homepage .hero-subtitle {
        font-size: 72px;
        margin-bottom: 32px;
        line-height: 1.3;
    }

    .homepage .hero-description {
        font-size: 18px;
        margin-bottom: 16px;
        line-height: 1.2;
    }

    .homepage .hero-quote {
        font-size: 48px;
        padding: 20px;
        margin: 25px 0;
        line-height: 1.4;
    }

    .homepage .toc-section {
        padding: 25px 18px;
    }

    .homepage .toc-title {
        font-size: 20px;
        margin-bottom: 18px;
        gap: 8px;
    }

    .homepage .toc-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .homepage .chapter-group {
        padding: 15px;
    }

    .homepage .group-title {
        font-size: 16px;
        margin-bottom: 12px;
        gap: 8px;
    }

    .homepage .chapter-link {
        padding: 10px 12px;
        font-size: 14px;
        gap: 8px;
        min-height: 48px;
        align-items: center;
    }

    .homepage .chapter-number {
        padding: 6px 10px;
        min-width: 40px;
        font-size: 12px;
        border-radius: 8px;
    }

    .homepage .principles-section {
        padding: 25.5px;
        margin-top: 25.5px;
    }

    .homepage .principles-title {
        font-size: 18px;
        margin-bottom: 20px;
    }

    .homepage .principles-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .homepage .principle-item {
        padding: 15px;
        font-size: 14px;
        gap: 12px;
    }

    .homepage .principle-icon {
        font-size: 16px;
        min-width: 32px;
    }
}

/* Small to medium screens - force single column */
@media (max-width: 768px) {
    .homepage .toc-grid {
        grid-template-columns: 1fr !important;
        gap: 20px;
    }
    
    .homepage .chapter-group {
        border-radius: 15px;
        padding: 20px;
    }
    
    .homepage .chapter-link {
        border-radius: 12px;
        transition: all 0.2s ease;
    }
}

/* Small to Medium Mobile/Large Phones */
@media (min-width: 481px) and (max-width: 768px) {
    .homepage .header {
        display: none;
    }

    .homepage .main-content {
        padding: 30px 20px;
    }

    .homepage .hero-section {
        padding: 15px 30px 45px 30px;
        margin-bottom: 30px;
    }

    .homepage .hero-icon {
        font-size: 55px;
        margin-bottom: 8px;
    }

    .homepage .hero-title {
        font-size: 42px;
        margin-bottom: 18px;
    }

    .homepage .hero-subtitle {
        font-size: 28px;
        margin-bottom: 24px;
    }

    .homepage .hero-description {
        font-size: 12px;
        margin-bottom: 18px;
    }

    .homepage .hero-quote {
        font-size: 22px;
        padding: 22px;
        margin: 25px 0;
    }

    .homepage .toc-section {
        padding: 30px 35px;
    }

    .homepage .toc-title {
        font-size: 28px;
        margin-bottom: 25px;
    }

    .homepage .toc-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    .homepage .header {
        display: none;
    }

    .homepage .main-content {
        padding: 45px 33.75px;
    }

    .homepage .hero-section {
        padding: 20px 45px 67.5px 45px;
        margin-bottom: 45px;
    }

    .homepage .hero-icon {
        font-size: 70px;
        margin-bottom: 10px;
    }

    .homepage .hero-title {
        font-size: 54px;
        margin-bottom: 22.5px;
    }

    .homepage .hero-subtitle {
        font-size: 40.5px;
        margin-bottom: 33.75px;
    }

    .homepage .hero-description {
        font-size: 22.5px;
        margin-bottom: 22.5px;
    }

    .homepage .hero-quote {
        font-size: 27px;
        padding: 28.5px;
        margin: 33.75px 0;
    }

    .homepage .toc-section {
        padding: 45px 67.5px;
    }

    .homepage .toc-title {
        font-size: 40.5px;
        margin-bottom: 33.75px;
    }

    .homepage .toc-grid {
        grid-template-columns: 1fr;
        gap: 25.5px;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(22.5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Enhanced entrance animations */
@keyframes staggerFadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-section {
    animation: staggerFadeInUp 0.8s ease-out;
}

.toc-section {
    animation: staggerFadeInUp 1s ease-out 0.2s both;
}

.homepage .chapter-group {
    animation: staggerFadeInUp 0.6s ease-out calc(var(--index) * 0.1s) both;
}

.homepage .chapter-group:nth-child(1) { --index: 1; }
.homepage .chapter-group:nth-child(2) { --index: 2; }
.homepage .chapter-group:nth-child(3) { --index: 3; }
.homepage .chapter-group:nth-child(4) { --index: 4; }
.homepage .chapter-group:nth-child(5) { --index: 5; }
.homepage .chapter-group:nth-child(6) { --index: 6; }
.homepage .chapter-group:nth-child(7) { --index: 7; }

/* Performance optimizations */
.homepage .chapter-link,
.homepage .chapter-group,
.homepage .nav-btn,
.mobile-menu-toggle {
    will-change: transform;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .homepage .chapter-group:hover {
        transform: none;
    }
    
    .homepage .chapter-link:hover {
        transform: none;
    }
}

/* Enhanced mobile touch targets */
@media (max-width: 768px) {
    .homepage .chapter-link {
        min-height: 52px !important;
        touch-action: manipulation;
    }
    
    .nav-link {
        min-height: 52px !important;
        touch-action: manipulation;
    }
    
    .mobile-menu-toggle {
        min-width: 52px !important;
        min-height: 52px !important;
        touch-action: manipulation;
    }
}

/* Fix text selection and readability on mobile */
@media (max-width: 480px) {
    * {
        -webkit-user-select: text;
        user-select: text;
    }
    
    .homepage .hero-title,
    .homepage .hero-subtitle,
    .homepage .hero-description,
    .homepage .hero-quote {
        text-rendering: optimizeLegibility;
        -webkit-text-size-adjust: none;
        -moz-text-size-adjust: none;
        text-size-adjust: none;
    }
    
    /* Prevent zoom on input focus */
    input[type="text"],
    input[type="email"],
    input[type="search"],
    textarea,
    select {
        font-size: 16px !important;
    }
    
    /* Balanced hero section font sizes for mobile */
    .hero-title, .homepage .hero-title {
        font-size: 42px !important;
        max-width: 100%;
        word-wrap: break-word;
    }
    
    .hero-subtitle, .homepage .hero-subtitle {
        font-size: 27px !important;
    }
    
    .hero-description, .homepage .hero-description {
        font-size: 24px !important;
    }
    
    .hero-quote, .homepage .hero-quote {
        font-size: 18px !important;
        padding: 15px !important;
        line-height: 1.4 !important;
    }
    
    .hero-icon, .homepage .hero-icon {
        font-size: 67.5px !important;
    }
}

/* Override logo icon to use book icon from index.html */
.logo-icon i::before {
    content: "\f518" !important;
}

/* =======================================================
   PAGE TITLE STYLES (flows with the page)
   ======================================================= */

.page-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid rgba(102, 126, 234, 0.2);
}

.page-title-text {
    font-family: 'Ma Shan Zheng', serif;
    font-size: 42px;
    margin: 0;
    background: linear-gradient(135deg, #4a54d1 0%, #667eea 50%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 400;
    letter-spacing: 1px;
}

.page-title-icon {
    font-size: 36px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: bookGlow 3s ease-in-out infinite;
}

@keyframes bookGlow {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Mobile responsive for page title */
@media (max-width: 768px) {
    .page-title-text {
        font-size: 32px;
    }
    
    .page-title-icon {
        font-size: 28px;
    }
    
    .page-title {
        margin-bottom: 20px;
        padding-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .page-title-text {
        font-size: 36px;
    }
    
    .page-title-icon {
        font-size: 30px;
    }
    
    .page-title {
        margin-bottom: 15px;
        padding-bottom: 12px;
        gap: 8px;
    }
}

/* Visitor Map Widget Mobile Styles */
.visitor-map-widget {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    margin-top: 30px;
}

.visitor-map-widget img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

@media (max-width: 480px) {
    .visitor-map-widget {
        padding: 15px 10px;
        margin-top: 20px;
    }
    
    .visitor-map-widget img {
        border-radius: 8px;
        box-shadow: 0 3px 10px rgba(0,0,0,0.15);
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .visitor-map-widget {
        padding: 18px 15px;
        margin-top: 25px;
    }
}