/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 25%, #16213e 50%, #0f3460 75%, #533483 100%);
    color: #ffffff;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Background Effects */
.bg-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: linear-gradient(45deg, #00d4ff, #ff6b6b);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.particle:nth-child(1) {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 60%;
    left: 80%;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    top: 80%;
    left: 40%;
    animation-delay: 4s;
}

.particle:nth-child(4) {
    top: 30%;
    left: 70%;
    animation-delay: 1s;
}

.particle:nth-child(5) {
    top: 70%;
    left: 10%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 1;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 0.8;
    }
}

@keyframes fadeInUp {
    from { 
        opacity: 0; 
        transform: translateY(50px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideInLeft {
    from { 
        opacity: 0; 
        transform: translateX(-50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

@keyframes slideInRight {
    from { 
        opacity: 0; 
        transform: translateX(50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

@keyframes scaleIn {
    from { 
        opacity: 0; 
        transform: scale(0.8); 
    }
    to { 
        opacity: 1; 
        transform: scale(1); 
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

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

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes backgroundPulse {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 60px;
    padding: 40px 0;
}

.company-name {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #00d4ff, #ff6b6b, #4ecdc4);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease-in-out infinite;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
    letter-spacing: 2px;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 80px;
    align-items: start;
}

/* Features Section */
.features-section {
    position: relative;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s ease-out;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0, 212, 255, 0.2);
}

.feature-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.feature-icon {
    font-size: 2rem;
    margin-right: 15px;
}

.feature-header h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #00d4ff;
}

.feature-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.feature-btn {
    padding: 15px 25px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-align: left;
    animation: scaleIn 0.6s ease-out;
    animation-fill-mode: both;
}

.feature-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.3s;
}

.feature-btn:hover::before {
    left: 100%;
}

.feature-btn.primary {
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
    color: white;
}

.feature-btn.secondary {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    color: white;
}

.feature-btn.tertiary {
    background: linear-gradient(135deg, #45b7d1, #96c93d);
    color: white;
}

.feature-btn.quaternary {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
}

.feature-btn.quinary {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    color: white;
}

.feature-btn.senary {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
    color: white;
}

.feature-btn.septenary {
    background: linear-gradient(135deg, #fa709a, #fee140);
    color: white;
}

.feature-btn:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    animation: heartbeat 0.6s ease-in-out;
}

/* Product Section */
.product-section {
    position: relative;
}

.product-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 25px;
    padding: 50px;
    text-align: center;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    animation: slideInRight 0.8s ease-out;
}

.product-card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    animation: rotate 8s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    100% {
        transform: rotate(360deg);
    }
}

.product-card:hover {
    transform: scale(1.02);
    box-shadow: 0 35px 70px rgba(0, 212, 255, 0.2);
}

.logo-container {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    padding: 20px 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    animation: bounce 1s ease-out;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    margin-right: 10px;
}

.logo-ai {
    font-size: 1.5rem;
    font-weight: 600;
    color: #ffff00;
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 10px;
    border-radius: 8px;
}

.product-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #00d4ff, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.product-subtitle {
    font-size: 1.3rem;
    color: #4ecdc4;
    margin-bottom: 25px;
    font-weight: 500;
}

.product-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    max-width: 500px;
    margin: 0 auto;
}

/* Product Features Showcase */
.features-showcase {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 41, 59, 0.95) 100%);
    position: relative;
    overflow: hidden;
}

.features-showcase::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.1) 0%, transparent 50%);
    pointer-events: none;
    animation: backgroundPulse 8s ease-in-out infinite;
}

@keyframes backgroundPulse {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.showcase-section {
    max-width: 1200px;
    margin: 0 auto 100px auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.showcase-section:nth-child(1) { animation-delay: 0.2s; }
.showcase-section:nth-child(2) { animation-delay: 0.4s; }
.showcase-section:nth-child(3) { animation-delay: 0.6s; }
.showcase-section:nth-child(4) { animation-delay: 0.8s; }

.showcase-section:last-child {
    margin-bottom: 0;
}

.showcase-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6, #06b6d4);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    animation: gradientShift 4s ease-in-out infinite;
}

.showcase-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    border-radius: 2px;
    animation: shimmer 2s ease-in-out infinite;
}

/* Chat Demo Styles */
.chat-demo {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    margin: 0 auto;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

.ai-avatar {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.chat-messages {
    margin-bottom: 20px;
}

.message {
    margin-bottom: 15px;
    padding: 15px;
    border-radius: 15px;
    line-height: 1.6;
}

.user-message {
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid rgba(59, 130, 246, 0.3);
    margin-left: 50px;
    border-radius: 20px 20px 5px 20px;
    animation: slideInRight 0.5s ease-out;
    transform-origin: right center;
}

.ai-message {
    background: rgba(168, 85, 247, 0.2);
    border: 1px solid rgba(168, 85, 247, 0.3);
    margin-right: 50px;
    border-radius: 20px 20px 20px 5px;
    animation: slideInLeft 0.5s ease-out;
    transform-origin: left center;
}

.message-controls {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 5px 10px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.control-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.control-btn:hover::before {
    left: 100%;
}

.learn-btn {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border: none;
}

.ai-suggestion {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 15px;
    padding: 20px;
    margin-top: 15px;
}

.suggestion-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    font-weight: 600;
    color: #fbbf24;
}

.suggestion-example {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
    font-style: italic;
}

.suggestion-controls {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.more-btn {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    border: none;
    color: white;
}

.chat-input {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
}

.input-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.tag {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 5px 12px;
    font-size: 0.8rem;
    color: #e2e8f0;
}

.input-area {
    display: flex;
    gap: 10px;
    align-items: center;
}

.chat-input-field {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    padding: 12px 20px;
    color: white;
    font-size: 1rem;
}

.chat-input-field::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.voice-btn {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.voice-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

/* Course Demo Styles */
.course-demo {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.category-tabs {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 20px;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s ease;
    color: #e2e8f0;
}

.tab.active {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border: none;
    color: white;
}

.tab:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.course-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.course-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: scaleIn 0.6s ease-out;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(59, 130, 246, 0.1), rgba(168, 85, 247, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    border-color: rgba(59, 130, 246, 0.5);
}

.course-card:hover::before {
    opacity: 1;
}

.course-image {
    width: 100%;
    height: 120px;
    border-radius: 10px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    position: relative;
    overflow: hidden;
}

.hotel-image {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.meeting-image {
    background: linear-gradient(135deg, #10b981, #3b82f6);
}

.course-image::after {
    content: '🏨';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
}

.meeting-image::after {
    content: '💼';
}

.course-info h4 {
    color: white;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.course-info p {
    color: #cbd5e1;
    line-height: 1.5;
}

.ai-courses h3 {
    color: white;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.ai-course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.ai-course-item {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.ai-course-item:hover {
    transform: translateY(-3px);
    border-color: rgba(59, 130, 246, 0.5);
}

.difficulty-tag {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 30px;
    text-align: center;
}

.difficulty-tag.a1 {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.course-name {
    flex: 1;
    color: white;
    font-size: 0.9rem;
}

.hot-tag {
    background: linear-gradient(135deg, #ef4444, #f59e0b);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
}

/* Tutors Demo Styles */
.tutors-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.tutor-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s ease-out;
}

.tutor-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(168, 85, 247, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tutor-card:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    border-color: rgba(59, 130, 246, 0.5);
}

.tutor-card:hover::before {
    opacity: 1;
}

.tutor-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 20px auto;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    position: relative;
    overflow: hidden;
}

.ruby-avatar {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.cathy-avatar {
    background: linear-gradient(135deg, #10b981, #3b82f6);
}

.linda-avatar {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
}

.tutor-avatar::after {
    content: '👩‍🏫';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem;
}

.tutor-info h4 {
    color: white;
    margin-bottom: 10px;
    font-size: 1.3rem;
    text-align: center;
}

.verified {
    color: #3b82f6;
    font-size: 1rem;
}

.tutor-info p {
    color: #cbd5e1;
    line-height: 1.6;
    margin-bottom: 15px;
    text-align: center;
}

.tutor-stats {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
}

.stat {
    background: rgba(255, 255, 255, 0.1);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: #e2e8f0;
}

.chat-btn {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border: none;
    border-radius: 25px;
    padding: 12px 30px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
    margin: 0 auto;
}

.chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.4);
}

/* Learning Demo Styles */
.learning-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.personal-center {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
}

.user-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    margin: 0 auto 20px auto;
    position: relative;
    overflow: hidden;
}

.user-avatar::after {
    content: '👤';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
}

.start-chat-btn {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    border: none;
    border-radius: 25px;
    padding: 15px 30px;
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
}

.start-chat-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(245, 158, 11, 0.4);
}

.learning-tools {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.tool-item {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.tool-item:hover {
    transform: translateY(-3px);
    border-color: rgba(59, 130, 246, 0.5);
}

.tool-icon {
    font-size: 1.5rem;
}

.daily-plan {
    text-align: left;
}

.daily-plan h4 {
    color: white;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.plan-items {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.plan-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px;
    border-radius: 10px;
}

.plan-icon {
    font-size: 1.2rem;
}

.progress {
    margin-left: auto;
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

.interactive-story {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
}

.story-header {
    text-align: center;
    margin-bottom: 30px;
}

.story-header h4 {
    color: white;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.story-header p {
    color: #cbd5e1;
    line-height: 1.6;
}

.story-scene {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #1e293b, #334155);
    border-radius: 15px;
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.story-scene::after {
    content: '🏕️';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
}

.story-progress h5 {
    color: white;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.progress-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.progress-icon {
    font-size: 1.3rem;
}

.progress-count {
    margin-left: auto;
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

.study-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #3b82f6;
    margin-bottom: 5px;
}

.stat-label {
    color: #cbd5e1;
    font-size: 0.9rem;
}

.study-info {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Enhanced Responsive Design for Features Showcase */
@media (max-width: 1024px) {
    .features-showcase {
        padding: 60px 0;
    }
    
    .showcase-section {
        margin-bottom: 80px;
    }
    
    .tutors-demo {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 25px;
    }
    
    .learning-demo {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .features-showcase {
        padding: 40px 0;
    }
    
    .showcase-section {
        margin-bottom: 60px;
        padding: 0 15px;
    }
    
    .showcase-title {
        font-size: 2rem;
        margin-bottom: 30px;
    }
    
    .chat-demo {
        padding: 20px 15px;
    }
    
    .user-message {
        margin-left: 10px;
    }
    
    .ai-message {
        margin-right: 10px;
    }
    
    .message-controls {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .control-btn {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
    
    .suggestion-controls {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .input-tags {
        gap: 8px;
    }
    
    .tag {
        padding: 4px 10px;
        font-size: 0.75rem;
    }
    
    .course-demo {
        padding: 25px 15px;
    }
    
    .category-tabs {
        gap: 10px;
        justify-content: center;
    }
    
    .tab {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .course-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .ai-course-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .ai-course-item {
        padding: 12px;
        flex-wrap: wrap;
    }
    
    .tutors-demo {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .tutor-card {
        padding: 25px 20px;
    }
    
    .tutor-stats {
        flex-direction: column;
        gap: 10px;
        align-items: center;
    }
    
    .learning-demo {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .personal-center {
        padding: 25px 20px;
    }
    
    .learning-tools {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .study-stats {
        gap: 20px;
        justify-content: center;
    }
    
    .interactive-story {
        padding: 25px 20px;
    }
    
    .story-scene {
        height: 150px;
    }
}

@media (max-width: 480px) {
    .features-showcase {
        padding: 30px 0;
    }
    
    .showcase-section {
        margin-bottom: 40px;
        padding: 0 10px;
    }
    
    .showcase-title {
        font-size: 1.8rem;
        margin-bottom: 25px;
    }
    
    .chat-demo {
        padding: 15px 10px;
    }
    
    .chat-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .user-message, .ai-message {
        margin-left: 0;
        margin-right: 0;
    }
    
    .ai-suggestion {
        padding: 15px;
    }
    
    .course-demo {
        padding: 20px 10px;
    }
    
    .category-tabs {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }
    
    .tab {
        padding: 6px 12px;
        font-size: 0.85rem;
        min-width: 120px;
        text-align: center;
    }
    
    .course-card {
        padding: 15px;
    }
    
    .course-image {
        height: 100px;
    }
    
    .ai-course-item {
        padding: 10px;
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    
    .tutor-card {
        padding: 20px 15px;
    }
    
    .tutor-avatar {
        width: 60px;
        height: 60px;
    }
    
    .tutor-info h4 {
        font-size: 1.1rem;
    }
    
    .personal-center {
        padding: 20px 15px;
    }
    
    .user-avatar {
        width: 80px;
        height: 80px;
    }
    
    .start-chat-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }
    
    .tool-item {
        padding: 12px;
    }
    
    .daily-plan h4 {
        font-size: 1.1rem;
    }
    
    .plan-item {
        padding: 10px;
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    
    .progress {
        margin-left: 0;
    }
    
    .interactive-story {
        padding: 20px 15px;
    }
    
    .story-scene {
        height: 120px;
    }
    
    .study-stats {
        gap: 15px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

/* Touch-friendly interactions for mobile */
@media (hover: none) and (pointer: coarse) {
    .control-btn, .chat-btn, .start-chat-btn, .tab, .course-card, .ai-course-item, .tutor-card, .tool-item {
        transition: all 0.2s ease;
    }
    
    .control-btn:active, .chat-btn:active, .start-chat-btn:active {
        transform: scale(0.95);
    }
    
    .course-card:active, .tutor-card:active {
        transform: scale(0.98);
    }
    
    .tool-item:active, .ai-course-item:active {
        transform: scale(0.97);
    }
}

/* Company Introduction */
.company-intro {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 50px;
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.company-intro::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #ff6b6b, #4ecdc4, #45b7d1, #f093fb);
    background-size: 300% 100%;
    animation: gradientMove 3s ease-in-out infinite;
}

@keyframes gradientMove {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: #00d4ff;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.intro-content p {
    font-size: 1.1rem;
    line-height: 2;
    color: rgba(255, 255, 255, 0.9);
    text-align: justify;
    text-indent: 2em;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-link {
    color: #4ecdc4;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.3s ease;
    position: relative;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #4ecdc4, #00d4ff);
    transition: width 0.3s ease;
}

.footer-link:hover::after {
    width: 100%;
}

.footer-link:hover {
    color: #00d4ff;
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.separator {
    margin: 0 20px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-address {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .company-name {
        font-size: 2.8rem;
    }
    
    .main-content {
        gap: 40px;
    }
    
    .product-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .company-name {
        font-size: 2.2rem;
        letter-spacing: 1px;
    }
    
    .main-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feature-card,
    .product-card {
        padding: 30px;
    }
    
    .product-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .company-intro {
        padding: 30px;
    }
    
    .intro-content p {
        font-size: 1rem;
        text-indent: 1.5em;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .separator {
        display: none;
    }
}

@media (max-width: 480px) {
    .company-name {
        font-size: 1.8rem;
    }
    
    .feature-card,
    .product-card,
    .company-intro {
        padding: 20px;
    }
    
    .product-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .feature-btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .logo-container {
        padding: 15px 20px;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .logo-ai {
        font-size: 1.2rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #00d4ff, #4ecdc4);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #4ecdc4, #00d4ff);
}