/* ============================================
   DESIGN SYSTEM — AtharsTech Landing
   Pure CSS. No frameworks. No utility classes.
   Adapted from PteroPay Gateway aesthetic.
   ============================================ */

/* --- Typography --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

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

.landing {
    --font: 'Inter', var(--font-family), -apple-system, BlinkMacSystemFont, sans-serif;
    --black: #09090b;
    --white: #fafafa;
    --gray-50: #f4f4f5;
    --gray-100: #e4e4e7;
    --gray-300: #d4d4d8;
    --gray-400: #a1a1aa;
    --gray-500: #71717a;
    --gray-600: #52525b;
    --gray-800: #27272a;
    --gray-900: #18181b;
    --gray-950: #09090b;
    --color-primary: 255, 255, 255;
    --border: rgba(255,255,255,0.08);
    --surface: rgba(255,255,255,0.03);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

    font-family: var(--font);
    background: var(--black);
    color: var(--white);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    scroll-behavior: smooth;
}

/* --- Grid Background (fading) --- */
.landing::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
    pointer-events: none;
    z-index: 0;
}

/* --- Ambient Glow --- */
.landing::after {
    content: '';
    position: fixed;
    top: -40%;
    left: 50%;
    transform: translateX(-50%);
    width: 900px;
    height: 700px;
    background: radial-gradient(circle, rgba(var(--color-primary), 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.landing-inner {
    position: relative;
    z-index: 1;
}

/* --- Container --- */
.l-container {
    max-width: 1100px;
    margin: 0 auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

/* --- Navbar --- */
.l-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
    backdrop-filter: blur(20px) saturate(1.6);
    -webkit-backdrop-filter: blur(20px) saturate(1.6);
    background: rgba(9,9,11,0.7);
    border-bottom: 1px solid transparent;
    border-image: linear-gradient(to right, transparent, rgba(255,255,255,0.15), transparent) 1;
}
.l-nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.l-logo {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.625rem;
}
.l-logo-icon {
    width: 2rem;
    height: 2rem;
    border-radius: 0.5rem;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}
.l-logo-icon svg {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--black);
}
.l-nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.l-nav-link {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    transition: color 0.2s, background 0.2s;
}
.l-nav-link:hover {
    color: var(--white);
    background: rgba(255,255,255,0.06);
}
.l-nav-cta {
    background: var(--white);
    color: var(--black);
    font-weight: 700;
    font-size: 0.875rem;
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    text-decoration: none;
    transition: transform 0.2s var(--ease-out-expo), box-shadow 0.2s;
    margin-left: 0.5rem;
}
.l-nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(255,255,255,0.1);
}

/* --- Animations --- */
@keyframes appear {
    from {
        opacity: 0;
        transform: translateY(32px) scale(0.98);
        filter: blur(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
@keyframes pulse-ring {
    0% { transform: scale(1); opacity: 0.4; }
    100% { transform: scale(1.8); opacity: 0; }
}
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.appear {
    animation: appear 0.9s var(--ease-out-expo) both;
}
.appear-d1 { animation-delay: 0.1s; }
.appear-d2 { animation-delay: 0.25s; }
.appear-d3 { animation-delay: 0.4s; }
.appear-d4 { animation-delay: 0.55s; }

/* --- Hero Section --- */
.l-hero {
    padding: 8rem 0 5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.l-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 1rem;
    border-radius: 9999px;
    border: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--gray-400);
    margin-bottom: 2rem;
}
.l-badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgb(var(--color-primary));
    position: relative;
}
.l-badge-dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: rgb(var(--color-primary));
    animation: pulse-ring 2s ease-out infinite;
}

.l-hero-title {
    font-size: clamp(2.75rem, 7vw, 5.5rem);
    font-weight: 900;
    letter-spacing: -0.05em;
    line-height: 0.95;
    margin-bottom: 1.75rem;
    max-width: 800px;
}
.l-hero-title-grad {
    display: inline-block;
    background: linear-gradient(to right, var(--white) 20%, rgba(255,255,255,0.4) 50%, var(--white) 80%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding-bottom: 0.1em;
    animation: shimmer 6s linear infinite;
}

.l-hero-sub {
    font-size: 1.125rem;
    color: var(--gray-300);
    max-width: 580px;
    line-height: 1.8;
    font-weight: 400;
    margin-bottom: 2.5rem;
}

.l-hero-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* --- Buttons --- */
.l-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.25s var(--ease-out-expo);
}
.l-btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1rem;
}
.l-btn-primary {
    background: linear-gradient(180deg, var(--white) 0%, #e4e4e7 100%);
    color: var(--black);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1), 0 4px 16px rgba(255,255,255,0.06), inset 0 1px 0 rgba(255,255,255,1);
}
.l-btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 24px rgba(255,255,255,0.12), inset 0 1px 0 rgba(255,255,255,1);
}
.l-btn-primary:active {
    transform: scale(0.97);
}
.l-btn-ghost {
    background: rgba(255,255,255,0.02);
    color: var(--gray-300);
    border: 1px solid var(--border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.l-btn-ghost:hover {
    color: var(--white);
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,255,255,0.15);
}

/* --- Marquee / Trust Logos --- */
.l-marquee-wrap {
    border-top: 1px solid transparent;
    border-image: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent) 1;
    padding: 3rem 0;
    overflow: hidden;
}
.l-marquee-label {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}
.l-marquee-track {
    display: flex;
    width: max-content;
    animation: marquee 30s linear infinite;
}
.l-marquee-track:hover {
    animation-play-state: paused;
}
.l-marquee-set {
    display: flex;
    align-items: center;
    gap: 4rem;
    padding: 0 2rem;
    flex-shrink: 0;
}
.l-marquee-item {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-500);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    transition: color 0.3s;
    user-select: none;
    letter-spacing: 0.02em;
}
.l-marquee-item:hover {
    color: var(--gray-300);
}
.l-marquee-item svg {
    width: 1rem;
    height: 1rem;
    opacity: 0.6;
}
.l-marquee-sep {
    color: var(--gray-800);
    user-select: none;
    font-size: 0.75rem;
}
.l-marquee-container {
    position: relative;
}
.l-marquee-fade-l,
.l-marquee-fade-r {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 80px;
    z-index: 2;
    pointer-events: none;
}
.l-marquee-fade-l {
    left: 0;
    background: linear-gradient(to right, var(--black), transparent);
}
.l-marquee-fade-r {
    right: 0;
    background: linear-gradient(to left, var(--black), transparent);
}

/* --- Section --- */
.l-section {
    padding: 6rem 0;
}
.l-section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.l-section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}
.l-section-sub {
    color: var(--gray-400);
    font-size: 1.0625rem;
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

/* --- Features Grid --- */
.l-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border-radius: 1.5rem;
    overflow: hidden;
    border: 1px solid var(--border);
}
@media (max-width: 768px) {
    .l-features {
        grid-template-columns: 1fr;
    }
}
.l-feature {
    background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 100%);
    padding: 2.5rem;
    transition: background 0.5s, box-shadow 0.5s;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.02);
}
.l-feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(var(--color-primary), 0.06), transparent 70%);
    opacity: 0;
    transition: opacity 0.5s;
    pointer-events: none;
}
.l-feature:hover::before {
    opacity: 1;
}
.l-feature:hover {
    background: rgba(255,255,255,0.02);
}
.l-feature-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.75rem;
    background: rgba(var(--color-primary), 0.08);
    border: 1px solid rgba(var(--color-primary), 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: rgb(var(--color-primary));
    transition: transform 0.3s var(--ease-out-expo), background 0.3s;
}
.l-feature:hover .l-feature-icon {
    transform: scale(1.1) rotate(4deg);
    background: rgba(var(--color-primary), 0.14);
}
.l-feature-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}
.l-feature h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.625rem;
    letter-spacing: -0.01em;
}
.l-feature p {
    color: var(--gray-400);
    font-size: 0.9375rem;
    line-height: 1.65;
}

/* --- Bento Grid --- */
.l-bento {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}
@media (max-width: 768px) {
    .l-bento { grid-template-columns: 1fr; }
}
.l-bento-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 100%);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    padding: 2.5rem;
    transition: transform 0.4s var(--ease-out-expo), border-color 0.4s, box-shadow 0.4s;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.02);
}
.l-bento-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.15);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05), 0 10px 30px rgba(0,0,0,0.5);
}
.l-bento-card--wide {
    grid-column: span 2;
}
@media (max-width: 768px) {
    .l-bento-card--wide { grid-column: span 1; }
}
.l-bento-num {
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: 0.75rem;
    background: linear-gradient(180deg, var(--white), var(--gray-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.l-bento-label {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

/* --- How It Works --- */
.l-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
    counter-reset: step-counter;
}
@media (max-width: 768px) {
    .l-steps { grid-template-columns: 1fr; }
}
.l-step {
    text-align: center;
    counter-increment: step-counter;
    position: relative;
}
.l-step-num {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.02);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--gray-300);
    transition: all 0.4s var(--ease-out-expo);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}
.l-step:hover .l-step-num {
    border-color: rgba(var(--color-primary), 0.5);
    color: var(--white);
    background: rgba(var(--color-primary), 0.1);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.1), 0 0 20px rgba(var(--color-primary), 0.1);
}
.l-step h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}
.l-step p {
    color: var(--gray-400);
    font-size: 0.9375rem;
    line-height: 1.6;
}
.l-step-line {
    display: none;
}
@media (min-width: 769px) {
    .l-step-line {
        display: block;
        position: absolute;
        top: 1.5rem;
        left: calc(50% + 2rem);
        width: calc(100% - 4rem);
        height: 1px;
        background: var(--border);
    }
    .l-step:last-child .l-step-line { display: none; }
}

/* --- FAQ --- */
.l-faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.l-faq-item {
    border-bottom: 1px solid var(--border);
}
.l-faq-item:first-child {
    border-top: 1px solid var(--border);
}
.l-faq-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    background: none;
    border: none;
    color: var(--white);
    font-family: var(--font);
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    cursor: pointer;
    text-align: left;
    transition: color 0.2s;
}
.l-faq-trigger:hover {
    color: var(--gray-300);
}
.l-faq-chevron {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--gray-500);
    flex-shrink: 0;
    transition: transform 0.3s var(--ease-out-expo);
}
.l-faq-item.open .l-faq-chevron {
    transform: rotate(180deg);
}
.l-faq-body {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.4s var(--ease-out-expo);
}
.l-faq-body-inner {
    overflow: hidden;
}
.l-faq-item.open .l-faq-body {
    grid-template-rows: 1fr;
}
.l-faq-a {
    color: var(--gray-400);
    font-size: 0.9375rem;
    line-height: 1.7;
    padding-bottom: 1.5rem;
}

/* --- CTA Block --- */
.l-cta {
    padding: 6rem 1.5rem;
}
.l-cta-outer {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 2.25rem;
    padding: 1px;
    background: linear-gradient(135deg, rgba(var(--color-primary), 0.3), rgba(255,255,255,0.08), rgba(var(--color-primary), 0.1));
}
.l-cta-card {
    background: var(--white);
    color: var(--black);
    border-radius: 2.25rem;
    padding: 5rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.l-cta-card::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 250px;
    background: radial-gradient(circle, rgba(var(--color-primary), 0.06), transparent 70%);
    pointer-events: none;
}
.l-cta-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 1.25rem;
    position: relative;
}
.l-cta-sub {
    font-size: 1.125rem;
    color: rgba(0,0,0,0.5);
    font-weight: 500;
    margin-bottom: 2.5rem;
    position: relative;
}
.l-cta-btn {
    background: var(--black);
    color: var(--white);
    padding: 1rem 2.5rem;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 1.0625rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.25s var(--ease-out-expo);
    position: relative;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.l-cta-btn:hover {
    transform: scale(1.04);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

/* --- Footer --- */
.l-footer {
    padding: 2.5rem 0;
    text-align: center;
    color: var(--gray-600);
    font-size: 0.8125rem;
    border-top: 1px solid var(--border);
}

/* --- Scroll-triggered reveals --- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-d1 { transition-delay: 0.1s; }
.reveal-d2 { transition-delay: 0.2s; }
.reveal-d3 { transition-delay: 0.3s; }

/* --- Responsive --- */
@media (max-width: 640px) {
    .l-hero { padding: 5rem 0 3rem; }
    .l-hero-sub { font-size: 1rem; }
    .l-section { padding: 4rem 0; }
    .l-nav-link { display: none; }
    .l-feature { padding: 2rem; }
    .l-bento-card { padding: 2rem; }
    .l-cta-card { padding: 3rem 1.5rem; border-radius: 1.5rem; }
    .l-cta-outer { border-radius: 1.5rem; }
    .l-step-line { display: none !important; }
}