:root {
    --bg-color: #050505;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --brand-primary: #3b82f6;
    /* Blue */
    --brand-secondary: #8b5cf6;
    /* Purple */
    --accent: #10b981;

    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
}

/* Animated Ambient Blobs */
.blob {
    position: absolute;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.6;
    animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, rgba(5, 5, 5, 0) 70%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2) 0%, rgba(5, 5, 5, 0) 70%);
    animation-delay: -5s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(5%, 10%) scale(1.1);
    }

    100% {
        transform: translate(-5%, -5%) scale(0.9);
    }
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: rgba(5, 5, 5, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-item:hover {
    color: var(--text-primary);
}

/* Buttons */
.btn-primary,
.btn-primary-outline,
.btn-secondary {
    font-family: var(--font-body);
    font-weight: 500;
    border-radius: 9999px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    border: none;
    box-shadow: 0 4px 14px 0 rgba(139, 92, 246, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

.btn-primary-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-decoration: none;
}

.btn-primary-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 9999px;
    color: #93c5fd;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s ease-out;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.gradient-text {
    background: linear-gradient(to right, var(--brand-primary), var(--brand-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 90%;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

/* Status Indicator */
.status-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--glass-bg);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    width: fit-content;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.status-indicator.loading {
    background-color: #fbbf24;
    box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.4);
    animation: pulse 1.5s infinite;
}

.status-indicator.connected {
    background-color: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

.status-indicator.error {
    background-color: #ef4444;
    box-shadow: 0 0 8px #ef4444;
}

#status-text {
    font-size: 0.85rem;
    font-family: monospace;
    color: var(--text-secondary);
}

/* Glass Card right side */
.hero-visual {
    position: relative;
    animation: fadeIn 1.2s ease-out 0.3s both;
}

.glass-card {
    background: rgba(20, 20, 20, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 20px;
    padding: 2rem;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease, border-color 0.5s ease;
}

.glass-card:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
    border-color: rgba(139, 92, 246, 0.3);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
}

.card-dots {
    display: flex;
    gap: 6px;
}

.card-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
}

.learning-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    transition: all 0.3s ease;
    cursor: default;
}

.learning-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.item-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.item-info h4 {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0.2rem;
}

.item-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.item-progress {
    margin-left: auto;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font-heading);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.7);
    }

    70% {
        box-shadow: 0 0 0 6px rgba(251, 191, 36, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(251, 191, 36, 0);
    }
}

/* Responsive */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .status-container {
        margin: 0 auto;
    }

    .hero-subtitle {
        margin: 0 auto 2.5rem;
    }

    .glass-card {
        transform: none;
    }

    .glass-card:hover {
        transform: none;
    }

    .navbar {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .nav-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}

/* ----- Site footer (首页等) ----- */
.site-footer {
    margin-top: 4rem;
    padding: 2rem 5% 2.5rem;
    border-top: 1px solid var(--glass-border);
    background: rgba(5, 5, 5, 0.55);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.site-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem 2rem;
}

.site-footer-brand {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.site-footer-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 1.25rem;
}

.site-footer-link {
    background: none;
    border: none;
    padding: 0;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    text-decoration: none;
    transition: color 0.2s ease;
}

.site-footer-link:hover {
    color: var(--brand-primary);
}

/* ----- Legal / info Modal ----- */
.legal-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    box-sizing: border-box;
}

.legal-modal.is-open {
    display: flex;
}

.legal-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    cursor: pointer;
}

.legal-modal-panel {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 560px;
    max-height: min(85vh, 720px);
    display: flex;
    flex-direction: column;
    background: rgba(20, 20, 20, 0.92);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow), 0 0 0 1px rgba(255, 255, 255, 0.04);
    animation: legalModalIn 0.25s ease-out;
}

@keyframes legalModalIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.legal-modal-header {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.25rem 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.legal-modal-header h2 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.35;
    margin: 0;
}

.legal-modal-close {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    font-size: 1.35rem;
    line-height: 1;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.legal-modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.legal-modal-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 1rem 1.25rem 1.35rem;
    -webkit-overflow-scrolling: touch;
}

.legal-modal-body p {
    margin: 0 0 1rem;
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.88);
}

.legal-modal-body p:last-child {
    margin-bottom: 0;
}

.legal-modal-body ul {
    margin: 0 0 1rem;
    padding-left: 1.15rem;
    font-size: 0.88rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

.legal-modal-body li {
    margin-bottom: 0.65rem;
}

.legal-modal-body li:last-child {
    margin-bottom: 0;
}

.legal-modal-body a {
    color: var(--brand-primary);
    text-decoration: none;
    word-break: break-all;
}

.legal-modal-body a:hover {
    text-decoration: underline;
}

.legal-modal-sub {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--text-secondary);
}

@media (max-width: 480px) {
    .site-footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .legal-modal-panel {
        max-height: 90vh;
    }
}