/* ==========================================================================
   Rupantor — project site
   Dark, quiet, typography-led. One accent, used sparingly.
   ========================================================================== */

:root {
    --bg:            #08090c;
    --bg-raised:     #0e1015;
    --surface:       rgba(255, 255, 255, 0.028);
    --surface-hover: rgba(255, 255, 255, 0.055);
    --line:          rgba(255, 255, 255, 0.09);
    --line-strong:   rgba(255, 255, 255, 0.18);

    --text:          #f4f5f7;
    --text-soft:     #a5abb8;
    --text-faint:    #6d7482;

    --accent:        #6d8cff;
    --accent-soft:   rgba(109, 140, 255, 0.14);
    --mint:          #34d399;
    --bkash:         #e2136e;
    --nagad:         #ee7623;

    --radius:        16px;
    --radius-sm:     10px;
    --maxw:          1140px;

    --font-body:     'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-display:  'Outfit', 'Inter', system-ui, sans-serif;
    --font-mono:     'JetBrains Mono', ui-monospace, 'SF Mono', Consolas, monospace;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

img { max-width: 100%; display: block; }

code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 6px;
    color: #dfe3ea;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.skip-link {
    position: absolute; left: -9999px; top: 12px; z-index: 999;
    background: var(--text); color: #000; padding: 10px 18px; border-radius: 8px;
    font-weight: 600; text-decoration: none;
}
.skip-link:focus { left: 24px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Ambient background ---------- */
.aurora { position: fixed; inset: 0; z-index: -2; overflow: hidden; pointer-events: none; }
.aurora-blob { position: absolute; border-radius: 50%; filter: blur(150px); opacity: 0.5; }
.blob-a {
    top: -280px; left: -180px; width: 720px; height: 720px;
    background: radial-gradient(circle, rgba(109, 140, 255, 0.5), transparent 68%);
}
.blob-b {
    top: 340px; right: -260px; width: 640px; height: 640px;
    background: radial-gradient(circle, rgba(52, 211, 153, 0.26), transparent 68%);
}
.grid-overlay {
    position: fixed; inset: 0; z-index: -1; pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 40%, transparent 100%);
}

/* ---------- Navbar ---------- */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(8, 9, 12, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-mark { width: 32px; height: 32px; border-radius: 8px; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; }
.brand-tag {
    font-size: 0.68rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
    color: var(--mint); background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.24);
    padding: 3px 9px; border-radius: 999px; white-space: nowrap;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
    color: var(--text-soft); text-decoration: none; font-size: 0.92rem; font-weight: 500;
    transition: color 0.18s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-ghost {
    display: inline-flex; align-items: center; gap: 7px;
    border: 1px solid var(--line); background: var(--surface);
    padding: 7px 14px; border-radius: 999px;
    transition: background 0.18s ease, border-color 0.18s ease;
}
.nav-ghost:hover { background: var(--surface-hover); border-color: var(--line-strong); }
.nav-ghost svg { width: 16px; height: 16px; }

@media (max-width: 820px) {
    .brand-tag { display: none; }
    .nav-links { gap: 18px; }
    .nav-links a:not(.nav-ghost) { display: none; }
}

/* ---------- Shared typography ---------- */
h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.028em; line-height: 1.12; }

.section { padding: 112px 24px 0; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.kicker {
    font-size: 0.75rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); font-weight: 700; }
.section-sub { color: var(--text-soft); font-size: 1.04rem; margin-top: 16px; }

/* ---------- Hero ---------- */
.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 64px; align-items: center;
    padding-top: 92px; padding-bottom: 24px;
}
.eyebrow {
    display: inline-flex; align-items: center; gap: 9px;
    font-size: 0.8rem; font-weight: 600; color: var(--text-soft);
    background: var(--surface); border: 1px solid var(--line);
    padding: 6px 14px; border-radius: 999px; margin-bottom: 26px;
}
.pulse {
    width: 7px; height: 7px; border-radius: 50%; background: var(--mint);
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
    animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
    0%   { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
    70%  { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
    100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero h1 { font-size: clamp(2.4rem, 5.2vw, 3.85rem); font-weight: 800; }
.gradient-text {
    background: linear-gradient(100deg, #8fa8ff 0%, #6d8cff 42%, #34d399 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
    color: var(--text-soft); font-size: 1.08rem; margin-top: 22px; max-width: 56ch;
}
.free-note {
    display: flex; align-items: flex-start; gap: 11px;
    margin-top: 24px; padding: 14px 18px;
    background: rgba(52, 211, 153, 0.06);
    border: 1px solid rgba(52, 211, 153, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.94rem; color: #cfe9dd; max-width: 56ch;
}
.free-note svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; color: var(--mint); }

/* ---------- Buttons ---------- */
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.cta-row.center { justify-content: center; }

.btn {
    display: inline-flex; align-items: center; gap: 13px;
    padding: 13px 22px; border-radius: 12px;
    text-decoration: none; font-family: var(--font-body);
    border: 1px solid transparent;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.btn-stack { display: flex; flex-direction: column; line-height: 1.25; text-align: left; }
.btn-title { font-weight: 600; font-size: 0.95rem; }
.btn-meta { font-size: 0.74rem; opacity: 0.72; }

.btn-primary {
    background: linear-gradient(180deg, #ffffff 0%, #dfe2e8 100%);
    color: #0a0b0e;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset, 0 10px 30px rgba(0, 0, 0, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(255, 255, 255, 0.12); }

.btn-outline {
    background: var(--surface); color: var(--text); border-color: var(--line);
    backdrop-filter: blur(8px);
}
.btn-outline:hover { background: var(--surface-hover); border-color: var(--line-strong); transform: translateY(-2px); }

.trust-row {
    display: flex; flex-wrap: wrap; gap: 22px; list-style: none;
    margin-top: 28px; font-size: 0.85rem; color: var(--text-faint);
}
.trust-row li { display: inline-flex; align-items: center; gap: 7px; }
.trust-row svg { width: 15px; height: 15px; }

/* ---------- App mockup ---------- */
.hero-visual { perspective: 1600px; }
.app-mock {
    background: linear-gradient(160deg, #12141a 0%, #0b0d11 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 40px 90px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.03) inset;
    transform: rotateY(-7deg) rotateX(3deg);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.app-mock:hover { transform: rotateY(-2deg) rotateX(1deg); }

.mock-bar {
    display: flex; align-items: center; gap: 7px;
    padding: 11px 14px; border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
}
.mock-bar .dot { width: 9px; height: 9px; border-radius: 50%; background: rgba(255, 255, 255, 0.16); }
.mock-title {
    margin-left: auto; margin-right: auto;
    font-size: 0.72rem; color: var(--text-faint); letter-spacing: 0.05em;
}
.mock-body { display: grid; grid-template-columns: 148px 1fr; min-height: 340px; }
.mock-side { border-right: 1px solid var(--line); padding: 12px 10px; display: flex; flex-direction: column; gap: 3px; }
.mock-nav {
    display: flex; align-items: center; gap: 9px;
    font-size: 0.76rem; color: var(--text-faint);
    padding: 8px 10px; border-radius: 7px;
}
.mock-nav svg { width: 14px; height: 14px; }
.mock-nav.is-active { background: rgba(255, 255, 255, 0.06); color: var(--text); }

.mock-main { padding: 14px; }
.mock-search {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.75rem; color: var(--text-faint);
    background: rgba(0, 0, 0, 0.3); border: 1px solid var(--line);
    border-radius: 8px; padding: 8px 12px; margin-bottom: 14px;
}
.mock-search svg { width: 13px; height: 13px; }
.mock-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mock-card {
    background: rgba(255, 255, 255, 0.028);
    border: 1px solid var(--line);
    border-radius: 10px; padding: 12px;
}
.mock-card header { font-size: 0.72rem; font-weight: 600; color: var(--text); margin-bottom: 10px; }
.mock-card header span { color: var(--text-faint); font-weight: 400; }
.specimen { font-size: 1.02rem; color: #e8eaef; margin-bottom: 12px; line-height: 1.35; }
.specimen.bn { font-size: 1.08rem; }
.specimen.bold { font-weight: 700; }
.specimen.serif { font-family: Georgia, 'Times New Roman', serif; font-style: italic; }
.specimen.mono { font-family: var(--font-mono); font-size: 0.8rem; color: #9fd8c0; }
.pill {
    font-size: 0.63rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
    color: var(--text-faint); border: 1px solid var(--line);
    padding: 3px 8px; border-radius: 999px;
}
.pill.on { color: var(--mint); border-color: rgba(52, 211, 153, 0.3); background: rgba(52, 211, 153, 0.08); }

@media (max-width: 960px) {
    .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 64px; }
    .app-mock { transform: none; }
    .app-mock:hover { transform: none; }
}

/* ---------- Bento feature grid ---------- */
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { background: var(--surface-hover); border-color: var(--line-strong); transform: translateY(-3px); }
.card.span-2 { grid-column: span 2; }
.card-icon {
    width: 42px; height: 42px; border-radius: 11px;
    display: grid; place-items: center; margin-bottom: 18px;
    background: var(--accent-soft); border: 1px solid rgba(109, 140, 255, 0.26);
    color: #a9bcff;
}
.card-icon svg { width: 20px; height: 20px; }
.card h3 { font-size: 1.12rem; font-weight: 600; margin-bottom: 9px; }
.card p { color: var(--text-soft); font-size: 0.94rem; }

@media (max-width: 900px) {
    .bento { grid-template-columns: 1fr 1fr; }
    .card.span-2 { grid-column: span 2; }
}
@media (max-width: 620px) {
    .bento { grid-template-columns: 1fr; }
    .card.span-2 { grid-column: span 1; }
}

/* ---------- Steps ---------- */
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li {
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 28px; position: relative;
}
.step-no {
    font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
    color: var(--accent); letter-spacing: 0.1em;
}
.steps h3 { font-size: 1.08rem; font-weight: 600; margin: 12px 0 8px; }
.steps p { color: var(--text-soft); font-size: 0.93rem; }

.build-box {
    margin-top: 20px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center;
    background: linear-gradient(140deg, rgba(109, 140, 255, 0.07), transparent 65%), var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius); padding: 32px;
}
.build-copy h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
.build-copy p { color: var(--text-soft); font-size: 0.94rem; }
.code-block {
    background: rgba(0, 0, 0, 0.42); border: 1px solid var(--line);
    border-radius: var(--radius-sm); padding: 18px 20px;
    font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.9;
    color: #b8d8cb; overflow-x: auto;
}
.code-block code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }

@media (max-width: 860px) {
    .steps { grid-template-columns: 1fr; }
    .build-box { grid-template-columns: 1fr; gap: 22px; }
}

/* ---------- Donation ---------- */
.donate-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.donate-card {
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 26px;
    display: flex; flex-direction: column;
    transition: border-color 0.2s ease, background 0.2s ease;
}
.donate-card:hover { border-color: var(--line-strong); background: var(--surface-hover); }
.donate-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.donate-badge {
    display: inline-flex; align-items: center; gap: 7px;
    font-family: var(--font-display); font-weight: 700; font-size: 0.9rem;
    padding: 6px 14px; border-radius: 8px; color: #fff;
}
.donate-badge svg { width: 15px; height: 15px; }
.donate-badge.bkash { background: var(--bkash); }
.donate-badge.nagad { background: var(--nagad); }
.donate-badge.bank  { background: rgba(255, 255, 255, 0.08); border: 1px solid var(--line-strong); color: var(--text); }
.donate-type { font-size: 0.72rem; color: var(--text-faint); letter-spacing: 0.05em; text-transform: uppercase; }
.donate-label { font-size: 0.78rem; color: var(--text-faint); letter-spacing: 0.05em; text-transform: uppercase; }
.donate-value {
    font-family: var(--font-mono); font-size: 1.42rem; font-weight: 500;
    color: var(--text); letter-spacing: 0.02em; margin: 6px 0 22px;
}

.bank-details { display: flex; flex-direction: column; gap: 11px; margin-bottom: 22px; }
.bank-details > div { display: flex; justify-content: space-between; align-items: baseline; gap: 14px; }
.bank-details dt { font-size: 0.78rem; color: var(--text-faint); white-space: nowrap; }
.bank-details dd { font-size: 0.9rem; color: var(--text); text-align: right; font-weight: 500; }
.bank-details dd.mono { font-family: var(--font-mono); font-size: 0.86rem; letter-spacing: 0.01em; }

.copy-btn {
    margin-top: auto;
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; padding: 11px 16px;
    background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line);
    border-radius: var(--radius-sm); color: var(--text);
    font-family: var(--font-body); font-size: 0.86rem; font-weight: 500;
    cursor: pointer; transition: background 0.18s ease, border-color 0.18s ease;
}
.copy-btn:hover { background: rgba(255, 255, 255, 0.1); border-color: var(--line-strong); }
.copy-btn svg { width: 15px; height: 15px; }
.copy-btn.copied { color: var(--mint); border-color: rgba(52, 211, 153, 0.35); background: rgba(52, 211, 153, 0.1); }

@media (max-width: 900px) { .donate-grid { grid-template-columns: 1fr; } }

/* ---------- Free ways to help ---------- */
.free-ways { margin-top: 48px; }
.free-ways h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 18px; }
.free-ways-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.way {
    display: flex; align-items: flex-start; gap: 13px;
    padding: 20px; border: 1px solid var(--line); border-radius: var(--radius-sm);
    background: var(--surface); text-decoration: none; color: var(--text);
    transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.way:hover { background: var(--surface-hover); border-color: var(--line-strong); transform: translateY(-2px); }
.way svg { width: 19px; height: 19px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }
.way span { display: flex; flex-direction: column; font-size: 0.86rem; color: var(--text-soft); line-height: 1.5; }
.way strong { color: var(--text); font-size: 0.94rem; font-weight: 600; margin-bottom: 2px; }

@media (max-width: 820px) { .free-ways-grid { grid-template-columns: 1fr; } }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 10px; max-width: 780px; }
.faq details {
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius-sm); padding: 18px 22px;
    transition: border-color 0.18s ease;
}
.faq details[open] { border-color: var(--line-strong); }
.faq summary {
    cursor: pointer; font-weight: 600; font-size: 0.98rem;
    list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: '+'; font-size: 1.3rem; color: var(--text-faint); font-weight: 400;
    transition: transform 0.2s ease; line-height: 1;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--text-soft); font-size: 0.94rem; margin-top: 12px; }

/* ---------- Closer ---------- */
.closer { text-align: center; padding: 128px 24px 108px; }
.closer h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 700; }
.closer > p { color: var(--text-soft); margin-top: 14px; font-size: 1.05rem; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 44px 0 34px; background: rgba(255, 255, 255, 0.012); }
.footer-inner {
    display: flex; justify-content: space-between; align-items: center;
    gap: 28px; flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 13px; }
.footer-brand .brand-mark { opacity: 0.85; }
.footer-name { font-family: var(--font-display); font-weight: 600; font-size: 1rem; }
.footer-note { font-size: 0.82rem; color: var(--text-faint); }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-links a {
    color: var(--text-soft); text-decoration: none; font-size: 0.88rem;
    transition: color 0.18s ease;
}
.footer-links a:hover { color: var(--text); }
.copyright { margin-top: 30px; font-size: 0.8rem; color: var(--text-faint); }

/* ---------- Copy toast ---------- */
.toast {
    position: fixed; left: 50%; bottom: 32px; transform: translate(-50%, 24px);
    background: #16181f; border: 1px solid var(--line-strong);
    color: var(--text); padding: 12px 22px; border-radius: 999px;
    font-size: 0.88rem; font-weight: 500;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
    opacity: 0; pointer-events: none; z-index: 200;
    transition: opacity 0.24s ease, transform 0.24s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }