/* =====================================================
   QuestSaber Landing Page — landing.css
   Bricolage Grotesque + Space Mono
   Reads CSS vars from config.js (--bg-color, --surface-color, --primary-color, --neon-blue, --text-main, --text-muted, --border-color)
   ===================================================== */

/* --- Reset & Foundations --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Fallbacks — config.js overrides these at runtime */
    --bg-color: #09090b;
    --surface-color: rgba(24, 24, 29, 0.6);
    --primary-color: #6366f1;
    --neon-blue: #00f0ff;
    --rose: #f697ff;
    --text-main: #ffffff;
    --text-muted: #a1a1aa;
    --border-color: rgba(255, 255, 255, 0.1);

    /* Landing-specific tokens */
    --lp-display: var(--font-family, 'Inter', sans-serif);
    --lp-mono: var(--font-family, 'Inter', sans-serif);
    --lp-radius-sm: 12px;
    --lp-radius-md: 20px;
    --lp-radius-lg: 28px;
    --lp-radius-xl: 36px;
    --lp-transition: 0.45s cubic-bezier(0.19, 1, 0.22, 1);
    --lp-blur: 22px;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-color);
    color: var(--text-main);
    font-family: var(--lp-display);
    line-height: 1.55;
    overflow-x: hidden;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: var(--lp-display);
    color: var(--text-main);
}

.mono {
    font-family: var(--lp-mono);
}

/* --- Grain Overlay --- */
.grain-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.035;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 180px;
}

/* --- Mesh Gradient Blobs --- */
.mesh-blob {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    pointer-events: none;
    z-index: 0;
    will-change: transform;
}

.mesh-blob--1 {
    width: 700px;
    height: 700px;
    top: -15%;
    left: -10%;
    background: radial-gradient(circle, var(--primary-color), transparent 70%);
    opacity: 0.08;
    animation: blobDrift1 25s ease-in-out infinite alternate;
}

.mesh-blob--2 {
    width: 500px;
    height: 500px;
    top: 40%;
    right: -8%;
    background: radial-gradient(circle, var(--neon-blue), transparent 70%);
    opacity: 0.06;
    animation: blobDrift2 30s ease-in-out infinite alternate;
}

.mesh-blob--3 {
    width: 400px;
    height: 400px;
    bottom: 5%;
    left: 25%;
    background: radial-gradient(circle, var(--primary-color), transparent 70%);
    opacity: 0.05;
    animation: blobDrift3 22s ease-in-out infinite alternate;
}

@keyframes blobDrift1 {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(80px, 50px) scale(1.15);
    }
}

@keyframes blobDrift2 {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(-60px, -40px) scale(1.1);
    }
}

@keyframes blobDrift3 {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(40px, -30px) scale(1.2);
    }
}

/* --- Navigation --- */
.lp-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1.5rem, 4vw, 4rem);
    height: 72px;
    background: color-mix(in srgb, var(--bg-color) 70%, transparent);
    backdrop-filter: blur(var(--lp-blur)) saturate(1.6);
    -webkit-backdrop-filter: blur(var(--lp-blur)) saturate(1.6);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--lp-transition), box-shadow var(--lp-transition);
}

.lp-nav.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.lp-nav__logo {
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1;
}

.lp-nav__logo span {
    color: var(--primary-color);
}

.lp-nav__links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.lp-nav__link {
    padding: 8px 18px;
    border-radius: var(--lp-radius-sm);
    font-weight: 600;
    font-size: 0.92rem;
    letter-spacing: 0.2px;
    color: var(--text-muted);
    transition: color var(--lp-transition), background var(--lp-transition);
    position: relative;
}

.lp-nav__link:hover {
    color: var(--text-main);
    background: color-mix(in srgb, var(--text-main) 6%, transparent);
}

.lp-nav__link--icon {
    padding: 8px 12px;
}

.lp-nav__link--icon i {
    width: 20px;
    height: 20px;
    display: block;
}

.lp-nav__mobile {
    display: none;
}

.lp-nav__mobile i {
    width: 26px;
    height: 26px;
}

/* --- Mobile Drawer --- */
.mobile-drawer {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
}

.mobile-drawer.open {
    opacity: 1;
    pointer-events: auto;
}

.mobile-drawer__inner {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background: color-mix(in srgb, var(--bg-color) 95%, var(--primary-color) 5%);
    border-left: 1px solid var(--border-color);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

.mobile-drawer.open .mobile-drawer__inner {
    transform: translateX(0);
}

.mobile-drawer__close {
    align-self: flex-end;
    padding: 8px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.mobile-drawer__close i {
    width: 28px;
    height: 28px;
}

.mobile-drawer__link {
    font-size: 1.3rem;
    font-weight: 700;
    padding: 16px 20px;
    border-radius: var(--lp-radius-sm);
    color: var(--text-muted);
    transition: all 0.25s ease;
}

.mobile-drawer__link:hover {
    background: color-mix(in srgb, var(--primary-color) 12%, transparent);
    color: var(--text-main);
}

/* --- Hero --- */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px clamp(1.5rem, 5vw, 5rem) 80px;
    gap: 24px;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    border-radius: 100px;
    font-family: var(--lp-mono);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--rose);
    background: color-mix(in srgb, var(--rose) 8%, transparent);
    border: 1px solid color-mix(in srgb, var(--rose) 20%, transparent);
    opacity: 0;
    transform: translateY(20px);
    animation: heroReveal 0.8s 0.2s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

.hero__title {
    font-size: clamp(3.2rem, 8vw, 7rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -2.5px;
    opacity: 0;
    transform: translateY(30px);
    animation: heroReveal 0.9s 0.35s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

.hero__title--accent {
    background: linear-gradient(135deg, var(--primary-color), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__sub {
    max-width: 560px;
    font-size: clamp(1.05rem, 1.8vw, 1.25rem);
    color: var(--text-muted);
    line-height: 1.7;
    font-weight: 400;
    opacity: 0;
    transform: translateY(25px);
    animation: heroReveal 0.85s 0.5s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

.hero__cta-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
    opacity: 0;
    transform: translateY(25px);
    animation: heroReveal 0.85s 0.65s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

.hero__scroll-hint {
    position: absolute;
    bottom: 32px;
    color: var(--text-muted);
    opacity: 0;
    animation: heroReveal 0.8s 1s cubic-bezier(0.19, 1, 0.22, 1) forwards, floatBounce 2.5s 1.8s ease-in-out infinite;
}

@keyframes heroReveal {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes floatBounce {

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

    50% {
        transform: translateY(10px);
    }
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 30px;
    border-radius: var(--lp-radius-sm);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.2px;
    transition: all var(--lp-transition);
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 24px color-mix(in srgb, var(--primary-color) 35%, transparent);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px color-mix(in srgb, var(--primary-color) 50%, transparent);
    filter: brightness(1.15);
}

.btn--ghost {
    background: color-mix(in srgb, var(--text-main) 6%, transparent);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn--ghost:hover {
    background: color-mix(in srgb, var(--text-main) 12%, transparent);
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--text-main) 25%, transparent);
}

.btn--glass {
    background: color-mix(in srgb, var(--surface-color) 80%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn--glass:hover {
    background: color-mix(in srgb, var(--primary-color) 12%, transparent);
    border-color: color-mix(in srgb, var(--primary-color) 30%, transparent);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px color-mix(in srgb, var(--primary-color) 15%, transparent);
}

/* --- Section Tags --- */
.section-tag {
    display: inline-block;
    font-family: var(--lp-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--neon-blue);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 12px;
}

.section-sub {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 520px;
    line-height: 1.6;
}

/* --- Features Grid --- */
.features {
    position: relative;
    z-index: 1;
    padding: 80px clamp(1.5rem, 5vw, 5rem) 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.features__header {
    margin-bottom: 56px;
}

.features__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
}

/* --- Feature Card --- */
.feature-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 36px;
    border-radius: var(--lp-radius-lg);
    background: color-mix(in srgb, var(--surface-color) 65%, transparent);
    backdrop-filter: blur(var(--lp-blur));
    -webkit-backdrop-filter: blur(var(--lp-blur));
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform var(--lp-transition), box-shadow var(--lp-transition), border-color var(--lp-transition);
    cursor: pointer;
    /* Reveal animation */
    opacity: 0;
    transform: translateY(40px);
}

.feature-card.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s cubic-bezier(0.19, 1, 0.22, 1), transform 0.7s cubic-bezier(0.19, 1, 0.22, 1), box-shadow var(--lp-transition), border-color var(--lp-transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: color-mix(in srgb, var(--primary-color) 40%, transparent);
    box-shadow:
        0 16px 48px color-mix(in srgb, var(--primary-color) 10%, transparent),
        0 0 0 1px color-mix(in srgb, var(--primary-color) 15%, transparent);
}

.feature-card.revealed:hover {
    transform: translateY(-6px);
}

.feature-card__glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), color-mix(in srgb, var(--primary-color) 8%, transparent) 0%, transparent 60%);
    pointer-events: none;
    transition: opacity 0.4s ease;
    opacity: 0;
}

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

.feature-card__icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: var(--lp-radius-md);
    background: color-mix(in srgb, var(--primary-color) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--primary-color) 25%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    transition: all var(--lp-transition);
}

.feature-card__icon-wrap i {
    width: 26px;
    height: 26px;
}

.feature-card:hover .feature-card__icon-wrap {
    background: color-mix(in srgb, var(--primary-color) 20%, transparent);
    box-shadow: 0 0 20px color-mix(in srgb, var(--primary-color) 25%, transparent);
    transform: scale(1.05);
}

.feature-card__title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.feature-card__desc {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.65;
    flex: 1;
}

.feature-card__stat {
    font-size: 0.88rem;
    color: var(--neon-blue);
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.feature-card__stat .mono {
    font-weight: 700;
    font-size: 1.1rem;
}

.feature-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.feature-card__meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.feature-card__arrow {
    position: absolute;
    top: 28px;
    right: 28px;
    color: var(--text-muted);
    opacity: 0;
    transform: translate(-6px, 6px);
    transition: all var(--lp-transition);
}

.feature-card:hover .feature-card__arrow {
    opacity: 1;
    transform: translate(0, 0);
    color: var(--primary-color);
}

/* Card sizing variants */

/* --- FAQ Section --- */
.faq {
    position: relative;
    z-index: 1;
    padding: 60px clamp(1.5rem, 5vw, 5rem);
    max-width: 1200px;
    margin: 0 auto;
}

.faq__header {
    text-align: center;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(20px);
}

.faq__header.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s cubic-bezier(0.19, 1, 0.22, 1), transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}

.faq__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.faq__item {
    background: color-mix(in srgb, var(--surface-color) 40%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--lp-radius-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: transform var(--lp-transition), box-shadow var(--lp-transition), border-color var(--lp-transition);
}

.faq__item.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s cubic-bezier(0.19, 1, 0.22, 1), transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}

.faq__item:hover {
    transform: translateY(-4px);
    border-color: color-mix(in srgb, var(--primary-color) 30%, transparent);
    box-shadow: 0 8px 32px color-mix(in srgb, var(--primary-color) 8%, transparent);
}

.faq__item.revealed:hover {
    transform: translateY(-4px);
}

.faq__question {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
    letter-spacing: -0.3px;
}

.faq__answer {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.faq__answer strong {
    color: var(--text-main);
    font-weight: 600;
}

/* --- Final CTA --- */
.final-cta {
    position: relative;
    z-index: 1;
    padding: 80px clamp(1.5rem, 5vw, 5rem) 120px;
    max-width: 1200px;
    margin: 0 auto;
}

.final-cta__inner {
    text-align: center;
    padding: 64px 48px;
    border-radius: var(--lp-radius-xl);
    background: color-mix(in srgb, var(--surface-color) 50%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
}

.final-cta__inner.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s cubic-bezier(0.19, 1, 0.22, 1), transform 0.7s cubic-bezier(0.19, 1, 0.22, 1);
}

.final-cta__inner::before {
    content: '';
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 300px;
    background: radial-gradient(ellipse, color-mix(in srgb, var(--primary-color) 15%, transparent), transparent 70%);
    pointer-events: none;
}

.final-cta__title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 12px;
    position: relative;
}

.final-cta__sub {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 480px;
    margin: 0 auto 32px;
    line-height: 1.6;
    position: relative;
}

.final-cta__links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
}

/* --- Footer --- */
.lp-footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border-color);
    background: color-mix(in srgb, var(--bg-color) 90%, transparent);
}

.lp-footer__inner {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 56px clamp(1.5rem, 5vw, 5rem) 40px;
}

.lp-footer__brand {
    max-width: 300px;
}

.lp-footer__tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 12px;
    line-height: 1.5;
}

.lp-footer__links {
    display: flex;
    gap: 64px;
}

.lp-footer__col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lp-footer__col h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-family: var(--lp-mono);
    margin-bottom: 4px;
}

.lp-footer__col a {
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: color 0.25s ease;
    font-weight: 500;
}

.lp-footer__col a:hover {
    color: var(--text-main);
}

.lp-footer__bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px clamp(1.5rem, 5vw, 5rem);
    border-top: 1px solid var(--border-color);
}

.lp-footer__bottom p {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-family: var(--lp-mono);
}

/* ============================
   RESPONSIVE
   ============================ */

@media (max-width: 900px) {
    .lp-nav__links {
        display: none;
    }

    .lp-nav__mobile {
        display: flex;
    }

    .features__grid {
        grid-template-columns: 1fr;
    }

    .feature-card--lg {
        grid-row: span 1;
        min-height: auto;
    }

    .faq__grid {
        grid-template-columns: 1fr;
    }

    .final-cta__inner {
        padding: 40px 24px;
    }

    .lp-footer__inner {
        flex-direction: column;
        gap: 32px;
    }

    .lp-footer__links {
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero__title {
        letter-spacing: -1.5px;
    }

    .btn {
        padding: 12px 22px;
        font-size: 0.92rem;
    }

    .feature-card {
        padding: 28px;
        border-radius: var(--lp-radius-md);
    }

    .final-cta__links {
        flex-direction: column;
        align-items: stretch;
    }

    .final-cta__links .btn {
        justify-content: center;
    }
}