:root {
    --font-main: 'Inter', sans-serif;
    --hue-primary: 240;
    --hue-secondary: 285;
    --hue-accent: 180;
    --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-medium: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 32px;
    --radius-pill: 50px;
}

.theme-dark {
    --c-primary: hsl(var(--hue-primary), 85%, 65%);
    --c-secondary: hsl(var(--hue-secondary), 85%, 65%);
    --c-accent: hsl(var(--hue-accent), 85%, 65%);
    --bg-main: #0A0A0F;
    --bg-content: #121218;
    --bg-header: rgba(10, 10, 15, 0.65);
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --text-primary: #ECEFF1;
    --text-secondary: #90A4AE;
    --text-muted: #546E7A;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-hover: rgba(255, 255, 255, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --glow-primary: hsla(var(--hue-primary), 85%, 65%, 0.3);
    --glow-secondary: hsla(var(--hue-secondary), 85%, 65%, 0.2);
    --gradient-main: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
    --scrollbar-thumb: var(--c-primary);
    --scrollbar-track: var(--bg-content);
}

.theme-light {
    --c-primary: hsl(var(--hue-primary), 75%, 55%);
    --c-secondary: hsl(var(--hue-secondary), 75%, 55%);
    --c-accent: hsl(var(--hue-accent), 75%, 55%);
    --bg-main: #F5F7FA;
    --bg-content: #FFFFFF;
    --bg-header: rgba(255, 255, 255, 0.65);
    --bg-card: rgba(255, 255, 255, 0.6);
    --bg-card-hover: rgba(255, 255, 255, 1);
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #9CA3AF;
    --border-color: rgba(0, 0, 0, 0.1);
    --border-color-hover: rgba(0, 0, 0, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-primary: hsla(var(--hue-primary), 85%, 65%, 0.4);
    --glow-secondary: hsla(var(--hue-secondary), 85%, 65%, 0.3);
    --gradient-main: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
    --scrollbar-thumb: var(--c-primary);
    --scrollbar-track: var(--bg-main);
}

.theme-cyberpunk {
    --hue-primary: 270;
    --hue-secondary: 180;
    --c-primary: hsl(var(--hue-primary), 95%, 65%);
    --c-secondary: hsl(var(--hue-secondary), 95%, 65%);
    --bg-main: #0A001A;
    --bg-content: #140033;
    --text-primary: #F0F0F0;
    --text-secondary: #8A8A8A;
    --border-color: hsla(var(--hue-secondary), 95%, 65%, 0.4);
}

.theme-lofi {
    --hue-primary: 190;
    --hue-secondary: 30;
    --c-primary: hsl(var(--hue-primary), 45%, 65%);
    --c-secondary: hsl(var(--hue-secondary), 45%, 65%);
    --bg-main: #F0EAD6;
    --bg-content: #F9F6EE;
    --text-primary: #4A4A4A;
    --text-secondary: #7A7A7A;
    --border-color: #DCDCDC;
}

.theme-synthwave {
    --hue-primary: 300;
    --hue-secondary: 200;
    --c-primary: hsl(var(--hue-primary), 95%, 70%);
    --c-secondary: hsl(var(--hue-secondary), 95%, 70%);
    --bg-main: #1A0033;
    --bg-content: #2A004D;
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --border-color: hsla(var(--hue-primary), 95%, 70%, 0.5);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background-color var(--transition-medium), color var(--transition-medium);
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background-color: var(--scrollbar-thumb);
    border-radius: 10px;
    border: 3px solid var(--scrollbar-track);
}

.container {
    width: 90%;
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    color: var(--c-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--c-secondary);
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

.section-title {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    text-align: center;
    margin-bottom: 4rem;
    font-weight: 800;
    opacity: 0;
    transform: translateY(25px);
    animation: slideUpFade 1s forwards;
    animation-delay: 0.2s;
}

.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    overflow: hidden;
}

.background-aurora {
    position: absolute;
    width: 250vw;
    height: 250vh;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle at 20% 30%, var(--glow-primary), transparent 35%),
                radial-gradient(circle at 80% 70%, var(--glow-secondary), transparent 35%);
    animation: auroraRotate 60s linear infinite;
}

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.25rem 0;
    z-index: 1000;
    background-color: var(--bg-header);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-medium), border-color var(--transition-medium), transform var(--transition-medium);
    transform: translateY(-100%);
    animation: slideDownIn 1s forwards;
    animation-delay: 0.5s;
}

.main-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -1px;
    color: var(--text-primary);
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.nav-link::before,
.nav-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: 0;
    left: 0;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: transform var(--transition-medium) cubic-bezier(0.19, 1, 0.22, 1);
}

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

.nav-link:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-link::after {
    transform-origin: right;
    transition-delay: 0.05s;
}

.nav-link:hover::after {
    transform: scaleX(0);
    transform-origin: left;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.theme-switcher {
    position: relative;
}

.theme-toggle-btn {
    background: var(--bg-content);
    border: 1px solid var(--border-color);
    cursor: pointer;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: all var(--transition-medium);
}

.theme-toggle-btn:hover {
    border-color: var(--border-color-hover);
    transform: scale(1.1);
}

.theme-options-container {
    position: absolute;
    top: 120%;
    right: 0;
    background: var(--bg-content);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    pointer-events: none;
}

.theme-options-container.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.theme-option {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-option:hover {
    background-color: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    z-index: 1;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 5px 20px hsla(var(--hue-primary), 85%, 65%, 0.2), 0 2px 5px var(--shadow-color);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px hsla(var(--hue-primary), 85%, 65%, 0.3), 0 4px 10px var(--shadow-color);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 50%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

.btn-secondary {
    background-color: var(--bg-content);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-hover);
    color: var(--c-primary);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    border-radius: var(--radius-lg);
}

.btn-cta {
    padding: 1.25rem 3.5rem;
    font-size: 1.25rem;
    border-radius: var(--radius-pill);
}

.hamburger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.bar {
    display: block;
    width: 28px;
    height: 3px;
    margin: 6px auto;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-medium);
}

.hamburger-menu.active .bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger-menu.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active .bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 120px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 55%;
    opacity: 0;
    transform: translateX(-30px);
    animation: slideInFromLeft 1.2s forwards;
    animation-delay: 1s;
}

.hero-title {
    font-size: clamp(2.8rem, 6vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 2rem;
    letter-spacing: -2px;
}

.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.animated-gradient {
    background-size: 250% auto;
    animation: gradientFlow 8s ease-in-out infinite;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 90%;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
}

.hero-visual {
    width: 40%;
    position: relative;
    opacity: 0;
    transform: scale(0.8);
    animation: scaleUpFade 1.2s forwards;
    animation-delay: 1.2s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image {
    width: 70%;
    border-radius: var(--radius-xl);
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 0 80px var(--glow-primary));
    animation: heroFloat 8s ease-in-out infinite;
}

.visual-glow-ring {
    position: absolute;
    width: 120%;
    height: 120%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--c-primary);
    border-radius: var(--radius-xl);
    opacity: 0.3;
    animation: glowRingPulse 8s ease-in-out infinite;
    z-index: 1;
}

.visual-glow-ring::before {
    content: '';
    position: absolute;
    width: 110%;
    height: 110%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--c-secondary);
    border-radius: var(--radius-xl);
    opacity: 0.2;
    animation-delay: 0.5s;
}

.features-section {
    padding: 8rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium), background var(--transition-medium);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    animation: slideUpFade 1s forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.3s; }
.feature-card:nth-child(2) { animation-delay: 0.5s; }
.feature-card:nth-child(3) { animation-delay: 0.7s; }
.feature-card:nth-child(4) { animation-delay: 0.9s; }

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(255, 255, 255, 0.08), transparent 40%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    z-index: 2;
}

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

.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    border-color: var(--border-color-hover);
    background: var(--bg-card-hover);
}

.feature-card-content {
    position: relative;
    z-index: 3;
}

.feature-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--gradient-main);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    color: #fff;
    box-shadow: 0 10px 20px -5px hsla(var(--hue-primary), 85%, 65%, 0.3);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.feature-card:hover .feature-icon-wrapper {
    transform: translateY(-8px) scale(1.1);
    box-shadow: 0 15px 30px -5px hsla(var(--hue-primary), 85%, 65%, 0.4);
}

.feature-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.statistics-section {
    padding: 7rem 0;
    background-color: var(--bg-content);
    position: relative;
    overflow: hidden;
}

.statistics-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 10% 20%, var(--glow-primary), transparent 40%),
        radial-gradient(circle at 90% 80%, var(--glow-secondary), transparent 40%);
    opacity: 0.3;
    z-index: 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 3rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.stat-item {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUpFade 1s forwards;
    padding: 2rem;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-medium), border-color var(--transition-medium);
}

.stat-item:hover {
    background-color: var(--bg-card);
    border-color: var(--border-color);
}

.stat-item:nth-child(1) { animation-delay: 0.4s; }
.stat-item:nth-child(2) { animation-delay: 0.6s; }
.stat-item:nth-child(3) { animation-delay: 0.8s; }
.stat-item:nth-child(4) { animation-delay: 1.0s; }

.stat-number {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -2px;
}

.stat-item p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.cta-section {
    padding: 9rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120%;
    height: 120%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--glow-primary), transparent 50%);
    opacity: 0.2;
    animation: pulse 10s infinite;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.cta-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.main-footer {
    padding-top: 6rem;
    background-color: var(--bg-content);
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 4rem;
    padding-bottom: 5rem;
}

.footer-info .logo {
    margin-bottom: 1.5rem;
    display: inline-block;
}

.footer-info p {
    color: var(--text-secondary);
    max-width: 300px;
}

.footer-links h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.footer-links ul li {
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
    position: relative;
}

.footer-links a:hover {
    color: var(--c-primary);
    padding-left: 8px;
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: -10px;
    opacity: 0;
    transition: opacity var(--transition-fast), left var(--transition-fast);
}

.footer-links a:hover::before {
    opacity: 1;
    left: -2px;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

@keyframes slideDownIn {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

@keyframes slideUpFade {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInFromLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

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

@keyframes auroraRotate {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

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

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.15; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.25; }
    100% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.15; }
}

@keyframes ripple {
    0% { transform: scale(0, 0) translate(-50%, -50%); opacity: 1; }
    20% { transform: scale(25, 25) translate(-50%, -50%); opacity: 1; }
    100% { opacity: 0; transform: scale(40, 40) translate(-50%, -50%); }
}

@keyframes heroFloat {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

@keyframes glowRingPulse {
   0% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
   50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.1; }
   100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
}

@media (max-width: 1024px) {
   .nav-menu {
       position: fixed;
       top: 0;
       right: -100%;
       width: 60%;
       max-width: 300px;
       height: 100vh;
       background: var(--bg-content);
       flex-direction: column;
       justify-content: center;
       align-items: center;
       gap: 2rem;
       transition: right var(--transition-medium);
       box-shadow: -10px 0 30px rgba(0,0,0,0.2);
   }
   .nav-menu.active {
       display: flex;
       right: 0;
   }
   .hamburger-menu {
       display: block;
   }
   .hero {
       flex-direction: column;
       text-align: center;
       padding-top: 150px;
       min-height: auto;
       padding-bottom: 5rem;
   }
   .hero-content {
       max-width: 100%;
       transform: none;
       animation: slideUpFade 1.2s forwards;
   }
   .hero-subtitle {
       max-width: 700px;
       margin-left: auto;
       margin-right: auto;
   }
   .hero-buttons {
       justify-content: center;
   }
   .hero-visual {
       width: 60%;
       margin-top: 5rem;
       transform: none;
       animation: scaleUpFade 1.2s forwards;
   }
   .footer-container {
       grid-template-columns: 1fr 1fr;
   }
   .footer-info {
       grid-column: 1 / -1;
   }
}

@media (max-width: 768px) {
   .nav-menu {
       display: none;
   }
   .stats-grid {
       grid-template-columns: repeat(2, 1fr);
   }
   .features-grid {
       grid-template-columns: 1fr;
   }
   .hero-title {
       letter-spacing: -1px;
   }
}

@media (max-width: 576px) {
   .stats-grid {
       grid-template-columns: 1fr;
   }
   .footer-container {
       grid-template-columns: 1fr;
       text-align: center;
   }
   .footer-info p {
       margin-left: auto;
       margin-right: auto;
   }
   .hero-buttons {
       flex-direction: column;
       align-items: center;
   }
   .btn {
       width: 80%;
       max-width: 300px;
   }
}