/* ════════════════════════════════
   CryptoQR — Light Theme Styles
════════════════════════════════ */

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

:root {
    --accent:       #00a37a;
    --accent-dark:  #008a67;
    --accent-light: rgba(0, 163, 122, 0.08);
    --accent-ring:  rgba(0, 163, 122, 0.18);

    --bg:           #f8fafc;
    --bg2:          #ffffff;
    --bg3:          #f1f5f9;

    --text:         #0f172a;
    --text2:        #64748b;
    --text3:        #94a3b8;

    --border:       #e2e8f0;
    --border-hover: #cbd5e1;

    --radius:       14px;
    --shadow-sm:    0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md:    0 4px 16px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.05);
    --shadow-lg:    0 10px 40px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.06);
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg3); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ══════════════════════════════════
   HEADER
══════════════════════════════════ */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 40px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 0 var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
}
.logo-icon { width: 32px; height: 32px; }
.logo-text {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
}
.logo-text span { color: var(--accent); }

.header-nav {
    display: flex;
    gap: 28px;
}
.header-nav a {
    color: var(--text2);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color .2s;
}
.header-nav a:hover { color: var(--text); }

/* ══════════════════════════════════
   HERO
══════════════════════════════════ */
.hero {
    text-align: center;
    padding: 80px 24px 60px;
    background: linear-gradient(180deg, #f0fdf9 0%, #f8fafc 100%);
    border-bottom: 1px solid var(--border);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: var(--accent-light);
    border: 1px solid var(--accent-ring);
    color: var(--accent);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.83rem;
    font-weight: 600;
    margin-bottom: 22px;
}

.hero h1 {
    font-size: clamp(2rem, 5.5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.18;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    color: var(--text);
}

.hero p {
    font-size: 1.05rem;
    color: var(--text2);
    max-width: 520px;
    margin: 0 auto 44px;
    line-height: 1.7;
}

/* ══════════════════════════════════
   GENERATOR CARD
══════════════════════════════════ */
.generator-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    max-width: 560px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.input-group { margin-bottom: 18px; }

.input-label {
    display: block;
    font-size: 0.76rem;
    font-weight: 700;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.select-wrap { position: relative; }
.select-arrow {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.network-select {
    width: 100%;
    padding: 12px 40px 12px 14px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 0.93rem;
    outline: none;
    cursor: pointer;
    transition: border-color .2s, box-shadow .2s;
    appearance: none;
    -webkit-appearance: none;
}
.network-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-ring);
}
.network-select option,
.network-select optgroup {
    background: #fff;
    color: var(--text);
}
.network-select optgroup { font-size: 0.78rem; color: var(--text2); }

.address-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 0.92rem;
    font-family: 'Courier New', 'Lucida Console', monospace;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    resize: none;
    line-height: 1.55;
}
.address-input::placeholder {
    color: var(--text3);
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 0.92rem;
}
.address-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-ring);
}
.address-input.input-error { border-color: #ef4444 !important; }

.error-msg {
    display: none;
    align-items: center;
    gap: 6px;
    color: #dc2626;
    font-size: 0.82rem;
    margin-top: 7px;
    padding: 8px 12px;
    background: #fef2f2;
    border-radius: 8px;
    border: 1px solid #fecaca;
}
.error-msg.visible { display: flex; }

.generate-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border: none;
    border-radius: 10px;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s, opacity .2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    letter-spacing: 0.01em;
    box-shadow: 0 4px 14px rgba(0, 163, 122, 0.3);
}
.generate-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 22px rgba(0, 163, 122, 0.38);
}
.generate-btn:active { transform: translateY(0); }

.privacy-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 14px;
    font-size: 0.77rem;
    color: var(--text3);
}

/* ══════════════════════════════════
   TRUST STRIP
══════════════════════════════════ */
.trust-strip {
    display: flex;
    justify-content: center;
    gap: 28px;
    padding: 22px 24px;
    flex-wrap: wrap;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.85rem;
    color: var(--text2);
    font-weight: 500;
}
.trust-item span { font-size: 1rem; }

/* ══════════════════════════════════
   SECTIONS
══════════════════════════════════ */
.section {
    padding: 72px 24px;
    max-width: 1120px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 1.85rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
    color: var(--text);
}

.section-subtitle {
    text-align: center;
    color: var(--text2);
    font-size: 0.97rem;
    margin-bottom: 44px;
}

.divider {
    height: 1px;
    background: var(--border);
}

/* ── Feature Cards ── */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 16px;
}
.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    transition: border-color .2s, box-shadow .2s, transform .2s;
    box-shadow: var(--shadow-sm);
}
.card:hover {
    border-color: var(--accent-ring);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.card-icon { font-size: 1.8rem; margin-bottom: 12px; }
.card h3 { font-size: 0.97rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.card p { font-size: 0.87rem; color: var(--text2); line-height: 1.65; }

/* ── Steps ── */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 20px;
}
.step {
    text-align: center;
    padding: 32px 20px 28px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow .2s, transform .2s;
}
.step:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.step-num {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0 auto 16px;
    box-shadow: 0 4px 12px rgba(0, 163, 122, 0.28);
}
.step h3 { font-size: 0.97rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.step p { font-size: 0.86rem; color: var(--text2); line-height: 1.65; }

/* ── Networks ── */
.networks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
    gap: 12px;
}
.net-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: border-color .2s, box-shadow .2s, transform .2s;
}
.net-card:hover {
    border-color: var(--accent-ring);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.net-logo {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin: 0 auto 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.net-card h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 3px; color: var(--text); }
.net-card p { font-size: 0.78rem; color: var(--text2); }

/* ── FAQ ── */
.faq-list {
    max-width: 740px;
    margin: 0 auto;
}
.faq-item {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: border-color .2s;
}
.faq-item.open {
    border-color: var(--accent-ring);
    box-shadow: 0 0 0 3px var(--accent-ring);
}

.faq-q {
    width: 100%;
    text-align: left;
    padding: 18px 22px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 0.94rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: color .2s;
    font-family: inherit;
}
.faq-q:hover { color: var(--accent); }
.faq-arrow {
    flex-shrink: 0;
    transition: transform .3s ease;
    color: var(--text3);
}
.faq-item.open .faq-arrow {
    transform: rotate(180deg);
    color: var(--accent);
}
.faq-a {
    padding: 0 22px;
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease, padding .3s ease;
    color: var(--text2);
    font-size: 0.88rem;
    line-height: 1.7;
}
.faq-item.open .faq-a {
    max-height: 240px;
    padding: 0 22px 20px;
}

/* ══════════════════════════════════
   FOOTER
══════════════════════════════════ */
footer {
    border-top: 1px solid var(--border);
    background: var(--bg2);
    padding: 40px 24px;
}
.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin: 16px 0;
    flex-wrap: wrap;
}
.footer-links a {
    color: var(--text2);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color .2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy {
    font-size: 0.8rem;
    color: var(--text3);
    text-align: center;
    line-height: 1.7;
}

/* ══════════════════════════════════
   ANIMATIONS
══════════════════════════════════ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp .45s ease forwards; }

@keyframes qr-glow {
    0%, 100% { box-shadow: 0 4px 24px rgba(0,0,0,0.10); }
    50%       { box-shadow: 0 8px 36px rgba(0, 163, 122, 0.18); }
}
.qr-card { animation: qr-glow 3s ease-in-out infinite; }

/* ══════════════════════════════════
   RESPONSIVE
══════════════════════════════════ */
@media (max-width: 768px) {
    header { padding: 12px 20px; }
    .header-nav { display: none; }
    .hero { padding: 52px 16px 40px; }
    .generator-card { padding: 22px 18px; }
    .trust-strip { gap: 14px; padding: 18px 16px; }
    .section { padding: 52px 16px; }
    .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
    .networks-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 500px) {
    .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .networks-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: 1fr; }
}