/* =========================================
   Variables & Theme
   ========================================= */
:root {
    /* Colors */
    --color-bg-body: #0a0a0f;
    --color-bg-card: #151520;
    --color-bg-card-hover: #1c1c2a;
    
    --color-primary: #6366f1; /* Indigo 500 */
    --color-primary-hover: #4f46e5;
    --color-accent: #06b6d4; /* Cyan 500 */
    
    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    
    --color-border: #2d2d3f;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
    --gradient-text: linear-gradient(to right, #818cf8, #22d3ee);

    /* Spacing */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-norm: 0.3s ease;
}

/* =========================================
   Reset & Base
   ========================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: --color-bg-body;
    background: radial-gradient(circle at 50% 0%, #1a1b2e 0%, #0a0a0f 60%);
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* =========================================
   Typography
   ========================================= */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: #fff;
}

.section__title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* =========================================
   Components: Buttons
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
    flex-wrap: wrap;
}

.btn__sub {
    font-size: 0.8em;
    font-weight: 400;
    opacity: 0.8;
    margin-left: 0.2rem;
}

.btn--primary {
    background-color: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn--outline {
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    background: rgba(255,255,255,0.05);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.btn--large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn--full {
    width: 100%;
}

/* =========================================
   Header
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header__container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo__icon {
    color: var(--color-accent);
}

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

.nav__link {
    color: var(--color-text-muted);
    font-weight: 500;
}

.nav__link:hover {
    color: #fff;
}

.header__controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-switcher {
    display: flex;
    gap: 0.25rem;
    background: rgba(255,255,255,0.05);
    padding: 4px;
    border-radius: var(--radius-sm);
}

.lang-btn {
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
}

.lang-btn:hover {
    color: #fff;
}

.lang-btn.active {
    background-color: var(--color-border);
    color: #fff;
}

.burger-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
}

.burger-btn span {
    width: 100%;
    height: 3px;
    background-color: #fff;
    border-radius: 2px;
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    padding-top: calc(var(--header-height) + 4rem);
    padding-bottom: 5rem;
    position: relative;
    overflow: hidden;
}

.hero__container { /* Added container class for centering */
    display: flex;
    justify-content: center;
    text-align: center;
}

.hero__content {
    max-width: 800px;
    z-index: 1;
}

.hero__title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* Background Glow Effect */
.hero__bg {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(99,102,241,0.2) 0%, rgba(0,0,0,0) 70%);
    z-index: 0;
    pointer-events: none;
}

/* =========================================
   Features Grid
   ========================================= */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: var(--transition-norm);
}

.card:hover {
    transform: translateY(-5px);
    background: var(--color-bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
}

.feature-card__icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* =========================================
   Pricing
   ========================================= */
.pricing-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-card--popular {
    border-color: var(--color-primary);
    background: linear-gradient(to bottom, #11111c, var(--color-bg-card));
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
}

.pricing-card__title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.pricing-card__price {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: #fff;
}

.pricing-card__price span {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.pricing-card__saving {
    display: inline-block;
    background: rgba(6, 182, 212, 0.2);
    color: var(--color-accent);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    align-self: center;
}

.pricing-card__features {
    margin-bottom: 2rem;
    flex-grow: 1;
    text-align: left;
    padding-left: 1rem; 
}

.pricing-card__features li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
    color: var(--color-text-muted);
}

.pricing-card__features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* =========================================
   How To / Steps
   ========================================= */
.howto .steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    background: var(--color-bg-card);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.step__num {
    background: var(--color-primary);
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

/* =========================================
   FAQ
   ========================================= */
.accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion__item {
    border-bottom: 1px solid var(--color-border);
}

.accordion__btn {
    width: 100%;
    padding: 1.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 500;
    text-align: left;
}

.accordion__btn .icon {
    font-size: 1.5rem;
    color: var(--color-accent);
    transition: transform var(--transition-fast);
}

.accordion__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-norm);
}

.accordion__content p {
    padding-bottom: 1.5rem;
    color: var(--color-text-muted);
}

.accordion__item.active .accordion__btn .icon {
    transform: rotate(45deg);
}

.accordion__item.active .accordion__content {
    max-height: 200px; /* Arbitrary large height */
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background: #050508;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--color-border);
    margin-top: 4rem;
}

.footer__container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer__desc {
    margin-top: 1rem;
    color: var(--color-text-muted);
    max-width: 300px;
}

.footer__col h4 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer__link {
    display: block;
    margin-bottom: 0.8rem;
    color: var(--color-text-muted);
}

.footer__link:hover {
    color: #fff;
    text-decoration: underline;
}

.footer__bottom {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
    .header__container {
        padding: 0 1rem;
    }
    
    .nav {
        display: none; /* Mobile menu implementation usually requires JS to toggle */
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--color-bg-card);
        flex-direction: column;
        padding: 2rem;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav.active {
        display: flex;
    }

    .burger-btn {
        display: flex;
    }

    .header__controls { 
        margin-right: 1rem; /* Space before burger */
    }

    .tg-btn-header {
        display: none; /* Hide header CTA on mobile to save space */
    }
    
    .hero__title {
        font-size: 2.2rem;
    }
    
    .footer__container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer__desc {
        margin: 1rem auto;
    }
}