/* ==========================================================================
   HTMLLab Global Premium Style Sheet
   Includes dynamic dark/light HSL palettes, glassmorphism, responsive styles, 
   micro-interactions, and animations.
   ========================================================================== */

/* Import Inter Font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- Root Variables & Theme Palettes --- */
:root {
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Harmonious Light HSL Palette */
    --bg-base: hsl(220, 30%, 97%);
    --bg-card: rgba(255, 255, 255, 0.7);
    --border-card: rgba(255, 255, 255, 0.5);
    
    --text-primary: hsl(224, 25%, 12%);
    --text-secondary: hsl(224, 15%, 40%);
    --text-muted: hsl(224, 10%, 55%);
    
    --color-primary: hsl(262, 80%, 55%);
    --color-primary-glow: hsla(262, 80%, 55%, 0.15);
    --color-secondary: hsl(190, 90%, 42%);
    --color-secondary-glow: hsla(190, 90%, 42%, 0.15);
    --color-accent: hsl(325, 85%, 55%);
    
    --border-input: hsl(224, 15%, 85%);
    --bg-input: rgba(255, 255, 255, 0.8);
    
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 30px rgba(100, 110, 140, 0.1);
    --shadow-lg: 0 20px 50px rgba(100, 110, 140, 0.15);
    --shadow-glow: 0 0 25px hsla(262, 80%, 55%, 0.2);
    
    --nav-bg: rgba(255, 255, 255, 0.75);
    --nav-border: rgba(0, 0, 0, 0.05);
    
    --glow-orb-1: hsla(262, 90%, 60%, 0.12);
    --glow-orb-2: hsla(190, 90%, 55%, 0.12);
    --glow-orb-3: hsla(325, 90%, 65%, 0.08);

    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    
    --transition-smooth: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-fast: all 0.18s ease-in-out;
}

/* Dark Mode Scheme Override */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-base: hsl(224, 25%, 5%);
        --bg-card: rgba(13, 17, 28, 0.65);
        --border-card: rgba(255, 255, 255, 0.07);
        
        --text-primary: hsl(224, 20%, 94%);
        --text-secondary: hsl(224, 12%, 75%);
        --text-muted: hsl(224, 10%, 50%);
        
        --color-primary: hsl(262, 85%, 62%);
        --color-primary-glow: hsla(262, 85%, 62%, 0.25);
        --color-secondary: hsl(190, 95%, 48%);
        --color-secondary-glow: hsla(190, 95%, 48%, 0.25);
        --color-accent: hsl(325, 90%, 60%);
        
        --border-input: rgba(255, 255, 255, 0.1);
        --bg-input: rgba(10, 12, 22, 0.6);
        
        --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
        --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.45);
        --shadow-glow: 0 0 30px hsla(262, 85%, 62%, 0.25);
        
        --nav-bg: rgba(10, 13, 23, 0.75);
        --nav-border: rgba(255, 255, 255, 0.05);
        
        --glow-orb-1: hsla(262, 95%, 55%, 0.15);
        --glow-orb-2: hsla(190, 95%, 45%, 0.12);
        --glow-orb-3: hsla(325, 95%, 60%, 0.08);
    }
}

/* --- Core Elements & Dynamic Background --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: background-color 0.5s ease, color 0.3s ease;
}

/* Ambient Glowing Orbs Background */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    animation: float 25s infinite ease-in-out alternate;
}

.orb-1 {
    width: 50vw;
    height: 50vw;
    background: var(--glow-orb-1);
    top: -10vw;
    left: -10vw;
}

.orb-2 {
    width: 45vw;
    height: 45vw;
    background: var(--glow-orb-2);
    bottom: -10vw;
    right: -10vw;
    animation-delay: -5s;
    animation-duration: 30s;
}

.orb-3 {
    width: 35vw;
    height: 35vw;
    background: var(--glow-orb-3);
    top: 30%;
    left: 60%;
    animation-delay: -12s;
    animation-duration: 20s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(5%, 8%) scale(1.15);
    }
    100% {
        transform: translate(-3%, -5%) scale(0.9);
    }
}

/* --- Layout Structure --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

main {
    flex: 1;
    padding-top: 120px;
    padding-bottom: 80px;
}

/* --- Navigation Header --- */
.header-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
}

.header-nav.scrolled {
    height: 70px;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.logo-link:hover {
    transform: translateY(-1px);
}

.logo-img {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    transition: var(--transition-smooth);
}

.logo-link:hover .logo-img {
    transform: scale(1.08) rotate(3deg);
    box-shadow: 0 6px 15px rgba(138, 43, 226, 0.25);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    font-size: 1.25rem;
    box-shadow: 0 4px 10px rgba(138, 43, 226, 0.3);
}

.logo-text span {
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-item a {
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 10px 18px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-item a:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.08);
}

.nav-item.active a {
    color: var(--color-primary);
    font-weight: 600;
    background-color: var(--color-primary-glow);
}

/* Mobile Menu Toggle button */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* --- Hero Headers for Pages --- */
.hero-section {
    text-align: center;
    margin-bottom: 48px;
    animation: fadeIn 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.hero-tag {
    display: inline-block;
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-primary);
    background: var(--color-primary-glow);
    border-radius: 30px;
    margin-bottom: 16px;
    border: 1px solid rgba(138, 43, 226, 0.15);
}

.hero-title {
    font-size: 2.85rem;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
    margin-bottom: 16px;
}

.hero-title span {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Premium Layout & Cards --- */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--border-radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    animation: slideUp 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.glass-card:hover {
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(138, 43, 226, 0.2);
}

/* Two-column layout for legal/support */
.content-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
}

/* --- Sidebar Navigation (Legal pages) --- */
.legal-sidebar {
    position: sticky;
    top: 120px;
    align-self: start;
}

.sidebar-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding-left: 8px;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-menu li a {
    display: block;
    text-decoration: none;
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    border-left: 3px solid transparent;
    transition: var(--transition-fast);
}

.sidebar-menu li a:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.sidebar-menu li.active a {
    color: var(--color-primary);
    background-color: var(--color-primary-glow);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

/* --- Document Content Style --- */
.legal-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.legal-content section {
    margin-bottom: 40px;
    scroll-margin-top: 110px; /* Offset for sticky nav */
}

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

.legal-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.legal-content h2::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 24px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
    border-radius: 4px;
}

.legal-content p {
    margin-bottom: 18px;
}

.legal-content ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.legal-content li {
    margin-bottom: 8px;
}

.legal-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.update-date {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-input);
    width: 100%;
}

/* --- Interactive FAQ Accordion (Support) --- */
.faq-section {
    margin-top: 36px;
}

.faq-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-input);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-item:hover {
    border-color: var(--color-primary-glow);
    background: rgba(255, 255, 255, 0.04);
}

.faq-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    padding: 20px 24px;
    text-align: left;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition-fast);
}

.faq-icon-box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-base);
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.faq-icon-box i {
    transition: transform 0.3s ease;
    font-style: normal;
    display: flex;
    align-items: center;
    justify-content: center;
}

.faq-icon-box i::before {
    content: "+";
    font-size: 1.25rem;
    font-weight: 400;
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.35s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.7;
}

/* Expanded state (JS driven) */
.faq-item.expanded {
    border-color: rgba(138, 43, 226, 0.35);
    background: rgba(138, 43, 226, 0.02);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.faq-item.expanded .faq-trigger {
    color: var(--color-primary);
}

.faq-item.expanded .faq-icon-box {
    background-color: var(--color-primary);
    color: white;
    transform: rotate(45deg);
}

.faq-item.expanded .faq-content {
    opacity: 1;
    padding-bottom: 24px;
}

/* --- Support Contact Layout --- */
.support-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: start;
}

.support-channels {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.channel-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-input);
    border-radius: var(--border-radius-md);
    padding: 28px;
    display: flex;
    gap: 20px;
    transition: var(--transition-smooth);
}

.channel-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-secondary-glow);
    background: rgba(255, 255, 255, 0.04);
    box-shadow: var(--shadow-sm);
}

.channel-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: var(--border-radius-sm);
    background: var(--color-secondary-glow);
    color: var(--color-secondary);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.channel-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.channel-info p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.channel-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-secondary);
    transition: var(--transition-fast);
}

.channel-btn:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* --- Premium Contact Form --- */
.form-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
}

.form-label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    font-family: var(--font-family);
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: var(--border-radius-sm);
    padding: 14px 16px;
    font-size: 0.98rem;
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-fast);
    width: 100%;
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
    background-color: rgba(255, 255, 255, 0.95);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* Floating validation message */
.form-error {
    font-size: 0.8rem;
    color: var(--color-accent);
    margin-top: 4px;
    display: none;
    font-weight: 500;
}

.form-group.has-error .form-control {
    border-color: var(--color-accent);
    background-color: rgba(255, 0, 100, 0.02);
}

.form-group.has-error .form-error {
    display: block;
    animation: fadeIn 0.25s ease;
}

.submit-btn {
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 15px 24px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(138, 43, 226, 0.25);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.submit-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(
        to right,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.3) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    transform: skewX(-25deg);
    transition: 0.75s;
    opacity: 0;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(138, 43, 226, 0.35);
}

.submit-btn:hover::after {
    left: 125%;
    opacity: 1;
}

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

/* Success Overlay (Interactive state) */
.form-success-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-radius: var(--border-radius-md);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    z-index: 10;
}

.form-success-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.success-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background-color: hsl(150, 80%, 40%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    box-shadow: 0 6px 20px rgba(46, 139, 87, 0.3);
    animation: scaleIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.success-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.success-desc {
    color: var(--text-secondary);
    max-width: 320px;
    font-size: 0.95rem;
}

/* --- Footer --- */
.footer-nav {
    border-top: 1px solid var(--nav-border);
    background-color: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: 40px 0;
    margin-top: auto;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.footer-links {
    list-style: none;
    display: flex;
    gap: 24px;
}

.footer-links li a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.footer-links li a:hover {
    color: var(--color-primary);
}

.copyright {
    color: var(--text-muted);
}

/* --- Animation Keyframes --- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.6);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .legal-sidebar {
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }
    
    .sidebar-menu {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .sidebar-menu li a {
        padding: 8px 12px;
        border-left: none;
        border-bottom: 3px solid transparent;
    }
    
    .sidebar-menu li.active a {
        border-left-color: transparent;
        border-bottom-color: var(--color-primary);
    }
    
    .support-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .support-channels {
        order: 2;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .glass-card {
        padding: 24px 20px;
        border-radius: var(--border-radius-md);
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--nav-bg);
        border-bottom: 1px solid var(--nav-border);
        flex-direction: column;
        padding: 20px;
        gap: 12px;
        box-shadow: var(--shadow-md);
        backdrop-filter: blur(20px);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-item a {
        display: block;
        padding: 12px 16px;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }
    
    .footer-links {
        justify-content: center;
        flex-wrap: wrap;
        gap: 16px;
    }
}