:root[data-theme="modern"] {
    --bg-color: #ffffff;
    --text-color: #1A1A1A;
    --primary-color: #1A1A1A;
    --secondary-color: #f0f0f0;
    --text-inverse: #ffffff;
    --accent: #0066FF;
}

:root[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #ffffff;
    --primary-color: #0066FF;
    --secondary-color: #111111;
    --text-inverse: #ffffff;
    --accent: #0066FF;
}

:root[data-theme="neon"] {
    --bg-color: #0B0E14;
    --text-color: #ffffff;
    --primary-color: #CCFF00;
    --secondary-color: #151a24;
    --text-inverse: #0B0E14;
    --accent: #CCFF00;
}

:root[data-theme="gradient"] {
    --bg-color: #2D004F;
    --text-color: #ffffff;
    --primary-color: #FF00CC;
    --secondary-color: #400073;
    --text-inverse: #ffffff;
    --accent: #FF00CC;
}

:root[data-theme="clean"] {
    --bg-color: #F5F5F7;
    --text-color: #002366;
    --primary-color: #002366;
    --secondary-color: #ffffff;
    --text-inverse: #ffffff;
    --accent: #0066FF;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.8s ease-in-out, color 0.8s ease-in-out;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Typography */
h1 { font-size: 4rem; font-weight: 700; line-height: 1.1; margin-bottom: 24px; }
h2 { font-size: 3rem; font-weight: 600; margin-bottom: 16px; }
p { font-size: 1.25rem; font-weight: 300; opacity: 0.8; }
.mega-title { font-size: 5vw; }

/* Buttons & Interactive Elements */
button, a.btn-outline {
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-inverse);
}

.btn-primary:hover {
    opacity: 0.8;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--nav-text, var(--text-color));
    color: var(--nav-text, var(--text-color));
}

.btn-outline:hover {
    background: var(--text-color);
    color: var(--bg-color);
}

/* Navbar Layer */
.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    padding: 24px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    
    /* Default (At top): Transparent Background, Bright White Text */
    --nav-text: #ffffff;
    background: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.5s ease-in-out;
}

/* Scrolled State */
.navbar.scrolled {
    --nav-text: #ffffff; /* Lock strictly to white */
    background: rgba(10, 10, 15, 0.85); /* Deep dark glass matching the flashy hero */
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--nav-text);
    letter-spacing: -1px;
    transition: color 0.5s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 8px;
    filter: drop-shadow(0 0 6px rgba(0, 191, 255, 0.5));
    transition: transform 0.3s ease, filter 0.3s ease;
}

.logo:hover .nav-logo-img {
    transform: rotate(10deg) scale(1.1);
    filter: drop-shadow(0 0 10px rgba(0, 191, 255, 0.9));
}

.anchor-menu a {
    text-decoration: none;
    color: var(--nav-text);
    font-weight: 500;
    font-size: 0.95rem;
    opacity: 0.8;
    transition: opacity 0.3s, color 0.5s;
    margin-right: 24px;
}

.anchor-menu a:hover {
    opacity: 1;
}

/* Dropdowns */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropbtn {
    background: transparent;
    color: var(--nav-text);
    border: none;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 500;
    transition: color 0.5s;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--bg-color);
    min-width: 160px;
    box-shadow: 0px 8px 32px rgba(0,0,0,0.1);
    border: 1px solid rgba(128,128,128,0.2);
    border-radius: 12px;
    padding: 8px 0;
    z-index: 1;
    transition: all 0.8s ease-in-out;
}

.dropdown:hover .dropdown-content {
    display: block;
    animation: fadeIn 0.3s forwards;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.dropdown-content a:hover {
    background-color: var(--secondary-color);
}

.auth-menu {
    min-width: 200px;
    padding: 16px;
}

.user-info p {
    font-size: 0.9rem;
    margin-bottom: 4px;
    opacity: 1;
}

.user-name { font-weight: 600; font-size: 1rem !important; }
.user-id { opacity: 0.6; }
hr { border: 0; height: 1px; background: rgba(128,128,128,0.2); margin: 12px 0; }

.hidden { display: none !important; }

/* Chat Widget */
.chat-widget {
    position: fixed;
    bottom: 32px; right: 32px;
    z-index: 1000;
}

.chat-toggle {
    width: 60px; height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--text-inverse);
    font-size: 1.5rem;
    border: none;
    box-shadow: 0 10px 24px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.chat-toggle:hover {
    transform: scale(1.1);
}

.chat-window {
    position: absolute;
    bottom: 80px; right: 0;
    width: 350px;
    background: var(--bg-color);
    border: 1px solid rgba(128,128,128,0.2);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    overflow: hidden;
    transform-origin: bottom right;
    animation: popup 0.3s ease-out forwards;
    transition: background-color 0.8s ease-in-out;
}

.chat-header {
    background: var(--primary-color);
    color: var(--text-inverse);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h4 { font-weight: 500; }

.close-chat {
    background: transparent; color: var(--text-inverse); border: none;
    font-size: 1.5rem; cursor: pointer;
}

.chat-body {
    padding: 16px;
    height: 250px;
    overflow-y: auto;
    background: var(--secondary-color);
}

.bot-msg {
    background: var(--bg-color);
    color: var(--text-color);
    padding: 12px;
    border-radius: 12px 12px 12px 0;
    display: inline-block;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.chat-input {
    display: flex;
    padding: 12px;
    border-top: 1px solid rgba(128,128,128,0.1);
}

.chat-input input {
    flex: 1;
    border: none;
    padding: 10px;
    border-radius: 8px;
    background: var(--secondary-color);
    color: var(--text-color);
    outline: none;
}

.chat-input button {
    background: transparent; color: var(--primary-color);
    border: none; font-size: 1.5rem; cursor: pointer; padding: 0 10px;
}

@keyframes popup {
    0% { opacity: 0; transform: scale(0.9) translateY(20px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes fadeIn {
    0% { opacity: 0; transform: translateY(-10px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* Stacking Cards Section */
.stack-container {
    position: relative;
    width: 100vw;
}

.card {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 100px 5% 80px;
    overflow: hidden;
    background-color: var(--bg-color);
    border-bottom: 1px solid rgba(128,128,128,0.1);
    will-change: transform;
    transition: background-color 0.8s ease-in-out, color 0.8s ease-in-out;
}

.card.bg-alt {
    background-color: var(--secondary-color);
}

.card-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1400px;
    gap: 5%;
    opacity: 0; /* Handled by GSAP */
    transform: translateY(50px);
}

.row-reverse {
    flex-direction: row-reverse;
}

.text-content {
    flex: 1;
    max-width: 600px;
}

.visual-content {
    flex: 1;
    max-width: 700px;
    height: auto;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0,0,0,0.15);
    background: rgba(128,128,128,0.1);
}

.visual-content img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease-out;
}

.visual-content:hover img {
    transform: scale(1.05);
}

/* Contact CTA Section */
.form-wrapper {
    background: transparent;
    box-shadow: none;
    display: flex;
    justify-content: flex-end;
}

.contact-form {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(128, 128, 128, 0.15);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 500px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.input-group input,
.input-group textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(128, 128, 128, 0.2);
    color: var(--text-color);
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.input-group textarea {
    resize: vertical;
    min-height: 120px;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 15px rgba(207, 255, 4, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 16px !important;
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 8px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease, opacity 0.3s;
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ── Field Validation ─────────────────────────────────────────── */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.field-error {
    display: none;
    font-size: 0.78rem;
    color: #ff4d6d;
    font-weight: 500;
    padding-left: 4px;
    animation: errorSlide 0.2s ease-out;
}

@keyframes errorSlide {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.input-group.has-error input,
.input-group.has-error textarea {
    border-color: #ff4d6d !important;
    background: rgba(255, 77, 109, 0.06) !important;
    box-shadow: 0 0 0 2px rgba(255, 77, 109, 0.2) !important;
}

.input-group.has-error .field-error {
    display: block;
}

/* ── Form Highlight (triggered by Contact Us btn) ─────────────── */
@keyframes formPulse {
    0%   { box-shadow: 0 20px 40px rgba(0,0,0,0.2); }
    30%  { box-shadow: 0 0 0 4px var(--primary-color), 0 20px 50px rgba(0,0,0,0.3); }
    70%  { box-shadow: 0 0 0 6px rgba(0,102,255,0.3), 0 20px 50px rgba(0,0,0,0.3); }
    100% { box-shadow: 0 20px 40px rgba(0,0,0,0.2); }
}

.contact-form.highlight {
    animation: formPulse 1.2s ease-in-out;
}

/* ── Success Message ──────────────────────────────────────────── */
.form-success {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 32px;
    text-align: center;
    animation: fadeIn 0.5s ease-out;
}

.form-success .success-icon {
    font-size: 3rem;
    animation: successBounce 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes successBounce {
    0%   { transform: scale(0); opacity: 0; }
    60%  { transform: scale(1.15); opacity: 1; }
    100% { transform: scale(1); }
}

.form-success p {
    font-size: 1.15rem;
    font-weight: 500;
    opacity: 1;
    line-height: 1.8;
    color: var(--text-color);
}

.footer-actions {
    display: flex;
    gap: 16px;
}

/* ----------------------------------- */
/* Sutéra Impact Hero Section          */
/* ----------------------------------- */
.hero-sutera {
    position: relative;
    padding: 0;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: hidden;
    background-color: var(--bg-color); /* Emphasize minimalist background */
}

.hero-sutera-content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-logo-img {
    width: 140px;
    height: 140px;
    object-fit: contain;
    margin-bottom: 32px;
    border-radius: 50%;
    background: rgba(5, 9, 20, 0.6);
    padding: 10px;
    filter: drop-shadow(0 0 30px rgba(0, 191, 255, 0.7));
    animation: heroLogoFloat 4s ease-in-out infinite;
}

@keyframes heroLogoFloat {
    0%, 100% { transform: translateY(0px); filter: drop-shadow(0 0 30px rgba(0, 191, 255, 0.5)); }
    50% { transform: translateY(-12px); filter: drop-shadow(0 0 50px rgba(0, 191, 255, 0.8)); }
}

.sutera-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 24px;
}

.line-mask {
    overflow: hidden;
    display: block;
}

.word {
    font-size: 9vw;
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
    color: #ffffff; /* Forced white for contrast against dark WebGL */
    text-transform: uppercase;
}

.sutera-subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    opacity: 0.8;
    color: #ffffff; /* Forced white */
    margin-top: 16px;
    letter-spacing: 0.05em;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    opacity: 0.6;
    z-index: 10;
    color: #ffffff;
}

.scroll-text {
    font-size: 0.7rem;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: rgba(128,128,128,0.3);
    display: block;
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: #ffffff;
    animation: scrollSlide 2s cubic-bezier(0.77, 0, 0.175, 1) infinite;
}

@keyframes scrollSlide {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(200%); }
}

/* FAQ / GEO Section */
.faq-container {
    max-width: 1400px;
    width: 100%;
    display: flex;
    flex-direction: column;
    padding: 100px 40px 60px;
    gap: 60px;
}

.faq-header .title {
    text-align: center;
    font-size: 3rem;
    margin-bottom: 24px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(128, 128, 128, 0.15);
    border-radius: 16px;
    padding: 32px;
    transition: transform 0.4s ease, border-color 0.4s ease;
}

.faq-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.faq-q {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 16px;
    line-height: 1.4;
}

.faq-a {
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.7;
    line-height: 1.7;
}

/* Final Outtro Section */
.outtro {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    background-color: var(--bg-color);
    overflow: hidden;
    text-align: center;
    padding-top: 100px; /* Offset to center content properly */
}

.outtro-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
}

.outtro-logo-img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    margin-bottom: 40px;
    border-radius: 50%;
    background: rgba(240, 242, 245, 0.8);
    padding: 16px;
    filter: drop-shadow(0 0 30px rgba(0, 191, 255, 0.5));
    animation: heroLogoFloat 5s ease-in-out infinite;
}

.glow-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.super-glow {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(207, 255, 4, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: glowPulse 4s infinite alternate ease-in-out;
}

@keyframes glowPulse {
    0% { transform: scale(0.9); opacity: 0.7; }
    100% { transform: scale(1.1); opacity: 1; }
}

.waiting-text {
    font-size: 5vw;
    font-weight: 800;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
    color: var(--text-color);
    text-shadow: 0 0 30px rgba(207, 255, 4, 0.4);
    text-transform: uppercase;
}

.waiting-sub {
    font-size: 1.5rem;
    opacity: 0.8;
    color: var(--text-color);
    letter-spacing: 0.05em;
    font-weight: 300;
}

.outtro .footer-bottom {
    margin-top: auto;
    padding: 24px;
    width: 100%;
    opacity: 0.6;
    font-size: 0.8rem;
    z-index: 2;
}

/* =========================================== */
/* Responsive — Tablet (≤1024px)               */
/* =========================================== */
@media (max-width: 1024px) {
    .card-content { flex-direction: column; text-align: center; }
    .row-reverse { flex-direction: column; }
    .text-content { margin-bottom: 40px; }
    .navbar { padding: 16px 24px; }
    h1 { font-size: 3rem; }
    h2 { font-size: 2.5rem; }
    .anchor-menu { display: none; }
    .word { font-size: 14vw; }
    .sutera-subtitle { font-size: 1rem; }

    /* Hide Login button and Download CTA on tablets too */
    .auth-container,
    .btn-outline {
        display: none !important;
    }
}

/* =========================================== */
/* Responsive — Mobile (≤768px)                */
/* =========================================== */
@media (max-width: 768px) {
    .navbar {
        padding: 12px 16px;
        gap: 8px;
    }

    .nav-left {
        gap: 12px;
    }

    .nav-right {
        gap: 8px;
    }

    /* Hide Login button and Download CTA on mobile (already hidden at 1024px) */
    .auth-container,
    .btn-outline {
        display: none !important;
    }

    /* Language button — show flag emoji only, adjust padding for emoji size */
    #current-lang {
        font-size: 1.1rem;
        padding: 4px 6px;
        letter-spacing: 0;
    }

    /* Compact dropdown menu */
    .dropdown-content {
        right: 0;
        left: auto;
        min-width: 120px;
        font-size: 0.85rem;
    }

    /* Compact logo */
    .logo {
        font-size: 1.3rem;
        gap: 7px;
    }

    .nav-logo-img {
        width: 28px;
        height: 28px;
    }

    /* Theme switcher stays but smaller */
    .theme-switch .dropbtn {
        font-size: 1rem;
        padding: 4px;
    }

    /* Hero section */
    .word { font-size: 16vw; }
    .hero-logo-img { width: 90px; height: 90px; }
    .sutera-subtitle { font-size: 0.9rem; letter-spacing: 0.02em; }

    /* Outtro section */
    .outtro-logo-img { width: 120px; height: 120px; }
    .waiting-text { font-size: 8vw; }
    .waiting-sub { font-size: 1.1rem; }

    /* Contact form goes full width */
    .contact-section { flex-direction: column; }
    .contact-left, .contact-right { width: 100%; }
}

/* ─── Active Theme Indicator ──────────────────────────────────────────────── */
.dropdown-content a[data-set-theme].theme-active {
    color: var(--primary-color);
    font-weight: 600;
    background-color: rgba(var(--primary-color-rgb, 0, 102, 255), 0.08);
    position: relative;
}

.dropdown-content a[data-set-theme].theme-active::after {
    content: '✓';
    position: absolute;
    right: 16px;
    font-size: 0.85rem;
    color: var(--primary-color);
}