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

:root {
    /* Color Palette inspired by the provided image */
    --primary-purple: #6B46C1;
    --secondary-purple: #8B5CF6;
    --accent-purple: #A855F7;
    --dark-bg: #0F0F23;
    --darker-bg: #0A0A1A;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #FFFFFF;
    --text-secondary: #B4B4B4;
    --text-muted: #8B8B8B;
    --gradient-primary: linear-gradient(135deg, #0F0F23 0%, #1A1A3A 50%, #2D1B69 100%);
    --gradient-card: linear-gradient(135deg, rgba(107, 70, 193, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    --shadow-primary: 0 10px 40px rgba(107, 70, 193, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --border-radius: 16px;
    --border-radius-small: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--gradient-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 35, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: block;
    overflow: hidden;
}

.logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 50%;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-purple), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-purple);
    transition: var(--transition);
}

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

.nav-mobile {
    display: none;
}

.mobile-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    padding: 30px 20px 40px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(107, 70, 193, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(168, 85, 247, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    justify-content: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    min-width: 360px;
    justify-content: center;
}

.cta-button.primary {
    background: linear-gradient(135deg, var(--primary-purple), var(--accent-purple));
    color: white;
    box-shadow: var(--shadow-primary);
}

.cta-button.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 50px rgba(107, 70, 193, 0.4);
}

.cta-button.secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
}

.cta-button.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

/* Character Section */
.hero-character {
    display: flex;
    justify-content: center;
    align-items: center;
}

.character-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.character-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 2;
    box-shadow: 0 20px 60px rgba(107, 70, 193, 0.4);
    /* 移除动画效果 */
    /* animation: float 6s ease-in-out infinite; */
    display: block;
    border: 3px solid var(--accent-purple);
}

.character-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(107, 70, 193, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    /* 移除动画效果 */
    /* animation: pulse 4s ease-in-out infinite; */
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* Section Styles */
section {
    padding: 40px 0;
    position: relative;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Features Section */
.features {
    background: rgba(0, 0, 0, 0.2);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

/* PC端 Why Choose GrokAni 2x2 布局 */
@media (min-width: 769px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
    }
}

.feature-card {
    background: var(--gradient-card);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card);
    border-color: var(--primary-purple);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Models Section */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

/* PC端 Supported AI Models 2x2 布局 */
@media (min-width: 769px) {
    .models-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
    }
}

.model-card {
    background: var(--gradient-card);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.model-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card);
    border-color: var(--primary-purple);
}

.model-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.model-icon {
    font-size: 2rem;
}

.model-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.model-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.api-link {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.api-link:hover {
    color: var(--secondary-purple);
    transform: translateX(4px);
}

.api-link.disabled {
    color: var(--text-muted);
    cursor: not-allowed;
}

/* Setup Section */
.setup {
    background: rgba(0, 0, 0, 0.2);
}

.setup-steps {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.step {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    background: var(--gradient-card);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.step:hover {
    transform: translateX(8px);
    border-color: var(--primary-purple);
}

.step-number {
    background: linear-gradient(135deg, var(--primary-purple), var(--accent-purple));
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    padding: 1rem;
    background: var(--gradient-card);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-small);
    backdrop-filter: blur(10px);
}

.feature-check {
    color: var(--accent-purple);
    font-weight: 700;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: var(--darker-bg);
    border-top: 1px solid var(--card-border);
    padding: 3rem 0 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-logo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.footer-brand-name {
    font-size: 1.2rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-purple), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-link-external {
    color: var(--accent-purple);
    text-decoration: none;
}

.footer-link-external:hover {
    text-decoration: underline;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-mobile {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-character {
        order: -1;
    }

    .character-image {
        width: 200px;
        height: 200px;
    }

    .character-glow {
        width: 280px;
        height: 280px;
    }

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

    .cta-button {
        min-width: 160px;
        padding: 14px 24px;
    }

    .features-grid,
    .models-grid {
        grid-template-columns: 1fr;
    }

    .step {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 1rem;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .container {
        padding: 0 15px;
    }

    section {
        padding: 60px 0;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .cta-button {
        width: 100%;
        max-width: 280px;
    }
}

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

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

::-webkit-scrollbar-track {
    background: var(--darker-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-purple);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-purple);
}

/* Advanced Visual Enhancements */

/* Glassmorphism effects */
.glass-effect {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Enhanced button hover effects */
.cta-button.primary {
    position: relative;
    overflow: hidden;
}

.cta-button.primary::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;
}

.cta-button.primary:hover::before {
    left: 100%;
}

/* Particle animation background */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(2px 2px at 20px 30px, rgba(107, 70, 193, 0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(168, 85, 247, 0.2), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(139, 92, 246, 0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(107, 70, 193, 0.2), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(168, 85, 247, 0.3), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: sparkle 20s linear infinite;
    pointer-events: none;
    opacity: 0.6;
}

@keyframes sparkle {
    0% {
        transform: translateY(0px);
    }

    100% {
        transform: translateY(-100px);
    }
}

/* Enhanced card hover effects */
.feature-card,
.model-card {
    position: relative;
    overflow: hidden;
}

.feature-card::before,
.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(107, 70, 193, 0.1) 0%, rgba(168, 85, 247, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.feature-card:hover::before,
.model-card:hover::before {
    opacity: 1;
}

/* Loading states */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(107, 70, 193, 0.3);
    border-top: 2px solid var(--primary-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

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

/* Enhanced mobile styles */
@media (max-width: 768px) {
    .hero::after {
        background-size: 100px 50px;
        animation-duration: 15s;
    }

    .character-image {
        animation-duration: 4s;
    }

    .character-glow {
        animation-duration: 3s;
    }
}

/* Print styles */
@media print {

    .header,
    .footer,
    .hero-character,
    .nav-mobile {
        display: none !important;
    }

    body {
        background: white !important;
        color: black !important;
    }

    .hero-title,
    .section-title {
        color: black !important;
        -webkit-text-fill-color: black !important;
    }

    .cta-button {
        border: 2px solid black !important;
        background: white !important;
        color: black !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #FFFFFF;
        --text-secondary: #E0E0E0;
        --card-border: rgba(255, 255, 255, 0.3);
        --primary-purple: #8B5CF6;
        --accent-purple: #A855F7;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .character-image,
    .character-glow {
        animation: none !important;
    }

    .hero::after {
        animation: none !important;
    }
}

/* Focus visible for better accessibility */
.cta-button:focus-visible,
.nav-link:focus-visible,
.api-link:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Enhanced scrollbar for webkit browsers */
::-webkit-scrollbar-corner {
    background: var(--darker-bg);
}

/* Selection styling */
::selection {
    background: rgba(107, 70, 193, 0.3);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(107, 70, 193, 0.3);
    color: var(--text-primary);
}

/* Enhanced typography */
.hero-title {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.section-title {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Improved link states */
.api-link {
    position: relative;
    display: inline-block;
}

.api-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-purple);
    transition: width 0.3s ease;
}

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

/* Enhanced mobile touch targets */
@media (max-width: 768px) {

    .cta-button,
    .nav-link,
    .api-link {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-link {
        padding: 12px 0;
    }
}