/* =====================================================================
   Yarana Smart Home — Landing Page Styles
   Theme: Premium SaaS, Light default + Dark mode toggle
   Colors: White/soft-gray base, #10b981 green + #0ea5e9 sky-blue brand
   ===================================================================== */

/* ── Google Fonts loaded in HTML ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── CSS Variables ─────────────────────────────────────────────────── */
:root {
    --c-green:    #10b981;
    --c-blue:     #0ea5e9;
    --c-green-d:  #059669;
    --c-blue-d:   #0284c7;
    --c-bg:       #ffffff;
    --c-bg-2:     #f8fafc;
    --c-bg-3:     #f1f5f9;
    --c-border:   #e2e8f0;
    --c-text:     #0f172a;
    --c-text-2:   #475569;
    --c-text-3:   #94a3b8;
    --c-card:     #ffffff;
    --c-shadow:   rgba(15,23,42,0.08);
    --c-shadow-d: rgba(15,23,42,0.16);
    --radius:     16px;
    --radius-sm:  10px;
    --transition: 0.25s ease;
}
[data-theme="dark"] {
    --c-bg:     #0a0f1e;
    --c-bg-2:   #0f1729;
    --c-bg-3:   #151f35;
    --c-border: #1e2d4a;
    --c-text:   #e2e8f0;
    --c-text-2: #94a3b8;
    --c-text-3: #475569;
    --c-card:   #0f1729;
    --c-shadow:   rgba(0,0,0,0.3);
    --c-shadow-d: rgba(0,0,0,0.5);
}

/* ── Reset ─────────────────────────────────────────────────────────── */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; scroll-padding-top:70px; }
body {
    font-family:'Inter',system-ui,-apple-system,sans-serif;
    font-size:16px; line-height:1.6;
    background:var(--c-bg); color:var(--c-text);
    transition: background var(--transition), color var(--transition);
}
img { max-width:100%; height:auto; }
a { color:var(--c-blue); text-decoration:none; }
a:hover { text-decoration:underline; }
ul { list-style:none; }
button { cursor:pointer; font-family:inherit; }

/* ── Container ─────────────────────────────────────────────────────── */
.container { max-width:1180px; margin:0 auto; padding:0 24px; }

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn {
    display:inline-flex; align-items:center; gap:8px;
    padding:12px 24px; border-radius:50px;
    font-size:15px; font-weight:600; border:none;
    transition:all var(--transition); cursor:pointer; text-decoration:none;
    white-space:nowrap;
}
.btn-primary {
    background:linear-gradient(135deg,var(--c-green),var(--c-blue));
    color:#fff; box-shadow:0 4px 20px rgba(16,185,129,.35);
}
.btn-primary:hover {
    transform:translateY(-2px);
    box-shadow:0 8px 30px rgba(16,185,129,.45);
    text-decoration:none; color:#fff;
}
.btn-secondary {
    background:var(--c-bg-3); color:var(--c-text);
    border:1.5px solid var(--c-border);
}
.btn-secondary:hover { background:var(--c-border); text-decoration:none; color:var(--c-text); }
.btn-outline {
    background:transparent; color:var(--c-green);
    border:1.5px solid var(--c-green);
}
.btn-outline:hover { background:var(--c-green); color:#fff; text-decoration:none; }
.btn-sm { padding:8px 18px; font-size:13px; }

/* ── Section commons ───────────────────────────────────────────────── */
.section-header { text-align:center; margin-bottom:56px; }
.section-label {
    display:inline-block; padding:6px 16px; border-radius:50px;
    background:rgba(16,185,129,.12); color:var(--c-green);
    font-size:12px; font-weight:700; letter-spacing:.08em;
    text-transform:uppercase; margin-bottom:14px;
}
.section-title { font-size:clamp(26px,4vw,40px); font-weight:800; margin-bottom:14px; letter-spacing:-.02em; }
.section-title span { background:linear-gradient(135deg,var(--c-green),var(--c-blue)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.section-subtitle { color:var(--c-text-2); font-size:17px; max-width:540px; margin:0 auto; }
section { padding:96px 0; }
section:nth-child(even) { background:var(--c-bg-2); }

/* ── Header / Nav ──────────────────────────────────────────────────── */
.site-header {
    position:sticky; top:0; z-index:1000;
    background:rgba(255,255,255,0.85); backdrop-filter:blur(16px);
    border-bottom:1px solid var(--c-border);
    transition:background var(--transition), border-color var(--transition);
}
[data-theme="dark"] .site-header { background:rgba(10,15,30,0.85); }
.navbar {
    display:flex; align-items:center; justify-content:space-between;
    padding:14px 0; gap:24px;
}
.logo { display:flex; align-items:center; gap:10px; font-weight:700; font-size:18px; color:var(--c-text); text-decoration:none; }
.logo-img { width:36px; height:36px; border-radius:8px; }
.logo-accent { color:var(--c-green); }
.nav-links { display:flex; align-items:center; gap:4px; }
.nav-link { padding:8px 12px; border-radius:8px; color:var(--c-text-2); font-size:14px; font-weight:500; transition:all var(--transition); }
.nav-link:hover { color:var(--c-text); background:var(--c-bg-3); text-decoration:none; }
.nav-link.active { color:var(--c-green); font-weight:600; }
.nav-actions { display:flex; align-items:center; gap:8px; }
.theme-btn {
    background:none; border:1.5px solid var(--c-border);
    color:var(--c-text-2); width:38px; height:38px;
    border-radius:50%; display:grid; place-items:center; font-size:16px;
    transition:all var(--transition);
}
.theme-btn:hover { border-color:var(--c-green); color:var(--c-green); }
.mobile-menu-btn { display:none; background:none; border:none; color:var(--c-text); font-size:22px; }

/* ── Hero ───────────────────────────────────────────────────────────── */
.hero { padding:100px 0 80px; overflow:hidden; position:relative; }
.hero-bg {
    position:absolute; inset:0; z-index:0;
    background:radial-gradient(ellipse 80% 60% at 50% -10%,rgba(16,185,129,.1) 0%,transparent 70%),
              radial-gradient(ellipse 50% 50% at 90% 50%,rgba(14,165,233,.08) 0%,transparent 60%);
}
.hero-content { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; position:relative; z-index:1; }
.hero-badge {
    display:inline-flex; align-items:center; gap:6px;
    background:rgba(16,185,129,.12); color:var(--c-green);
    border:1px solid rgba(16,185,129,.25); border-radius:50px;
    padding:6px 14px; font-size:13px; font-weight:600; margin-bottom:20px;
}
.hero-title { font-size:clamp(32px,5vw,56px); font-weight:800; letter-spacing:-.03em; line-height:1.1; margin-bottom:18px; }
.hero-title span { background:linear-gradient(135deg,var(--c-green),var(--c-blue)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero-subtitle { font-size:18px; color:var(--c-text-2); margin-bottom:10px; }
.hero-tagline { font-size:15px; color:var(--c-text-3); margin-bottom:32px; }
.hero-cta { display:flex; gap:12px; flex-wrap:wrap; margin-bottom:40px; }
.hero-badges { display:flex; flex-wrap:wrap; gap:10px; }
.hero-badge-item {
    display:flex; align-items:center; gap:6px;
    background:var(--c-bg-2); border:1px solid var(--c-border);
    border-radius:50px; padding:6px 14px; font-size:13px; font-weight:500; color:var(--c-text-2);
}
.hero-badge-item span { font-size:16px; }

/* Phone mockup */
.hero-visual { display:flex; justify-content:center; align-items:center; position:relative; }
.phone-mockup {
    width:260px; height:520px; border-radius:36px;
    border:8px solid var(--c-border);
    background:var(--c-bg-2); overflow:hidden; position:relative;
    box-shadow:0 40px 80px var(--c-shadow-d);
    animation:float 5s ease-in-out infinite;
}
[data-theme="dark"] .phone-mockup { border-color:#1e2d4a; }
@keyframes float { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-16px); } }
.phone-notch { width:80px; height:24px; background:var(--c-border); border-radius:0 0 16px 16px; margin:0 auto 12px; }
.phone-screen { padding:0 12px; }
.phone-appbar { display:flex; justify-content:space-between; align-items:center; margin-bottom:14px; font-size:13px; font-weight:600; }
.phone-status { font-size:10px; padding:3px 8px; border-radius:50px; background:rgba(16,185,129,.15); color:var(--c-green); }
.phone-device-card {
    background:var(--c-bg-3); border-radius:14px; padding:12px; margin-bottom:10px;
    border:1px solid var(--c-border);
}
[data-theme="dark"] .phone-device-card { background:var(--c-bg-3); }
.phone-device-name { font-size:12px; font-weight:600; margin-bottom:8px; }
.phone-relays { display:grid; grid-template-columns:1fr 1fr; gap:6px; }
.relay-btn {
    padding:6px 4px; border-radius:8px; text-align:center;
    font-size:10px; font-weight:600;
}
.relay-btn.on { background:rgba(16,185,129,.2); color:var(--c-green); }
.relay-btn.off { background:rgba(148,163,184,.15); color:var(--c-text-3); }
.phone-footer { margin-top:12px; display:flex; justify-content:space-around; }
.phone-nav-item { font-size:9px; text-align:center; color:var(--c-text-3); }
.phone-nav-item.active { color:var(--c-green); }

/* Floating signals */
.signal-badge {
    position:absolute; padding:8px 14px; border-radius:50px;
    font-size:12px; font-weight:600; border:1px solid var(--c-border);
    background:var(--c-card); box-shadow:0 4px 16px var(--c-shadow);
    display:flex; align-items:center; gap:6px;
}
.signal-1 { top:60px; right:-20px; animation:pulse-badge 3s ease-in-out infinite; }
.signal-2 { bottom:100px; right:-30px; animation:pulse-badge 3s ease-in-out 1s infinite; }
.signal-3 { top:200px; left:-40px; animation:pulse-badge 3s ease-in-out 2s infinite; }
@keyframes pulse-badge { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.85;transform:scale(.97)} }
.dot { width:8px; height:8px; border-radius:50%; }
.dot.green { background:var(--c-green); }
.dot.blue  { background:var(--c-blue); }

/* ── Stats bar ──────────────────────────────────────────────────────── */
.stats-bar { padding:28px 0; background:var(--c-bg-2); border-top:1px solid var(--c-border); border-bottom:1px solid var(--c-border); }
.stats-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:0; }
.stat-item { text-align:center; padding:16px; border-right:1px solid var(--c-border); }
.stat-item:last-child { border-right:none; }
.stat-number { font-size:32px; font-weight:800; background:linear-gradient(135deg,var(--c-green),var(--c-blue)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.stat-label { font-size:13px; color:var(--c-text-2); font-weight:500; margin-top:2px; }

/* ── Features grid ──────────────────────────────────────────────────── */
.features-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:24px; }
.feature-card {
    background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius);
    padding:28px; transition:all var(--transition);
}
.feature-card:hover {
    transform:translateY(-4px);
    border-color:var(--c-green);
    box-shadow:0 12px 40px var(--c-shadow-d);
}
.feature-icon {
    width:52px; height:52px; border-radius:14px; margin-bottom:18px;
    display:grid; place-items:center; font-size:24px;
    background:linear-gradient(135deg,rgba(16,185,129,.15),rgba(14,165,233,.15));
}
.feature-title { font-size:17px; font-weight:700; margin-bottom:10px; }
.feature-desc { font-size:14px; color:var(--c-text-2); line-height:1.6; }

/* ── Screenshots carousel ───────────────────────────────────────────── */
.screenshot-wrap { overflow-x:auto; padding-bottom:16px; }
.screenshot-carousel { display:flex; gap:20px; padding:8px 0; width:max-content; }
.screenshot-item { flex:0 0 200px; }
.screenshot-item img {
    width:100%; border-radius:16px; border:3px solid var(--c-border);
    box-shadow:0 8px 30px var(--c-shadow);
    transition:transform var(--transition);
}
.screenshot-item:hover img { transform:scale(1.04); }
.screenshot-caption { font-size:13px; color:var(--c-text-2); text-align:center; margin-top:8px; }
.screenshots-empty { text-align:center; padding:40px; color:var(--c-text-3); font-style:italic; }

/* ── How it works ───────────────────────────────────────────────────── */
.steps-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:24px; }
.step-card {
    background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius);
    padding:28px; position:relative; transition:all var(--transition);
}
.step-card:hover { transform:translateY(-4px); box-shadow:0 12px 40px var(--c-shadow-d); }
.step-number {
    position:absolute; top:-14px; left:28px;
    width:28px; height:28px; border-radius:50%;
    background:linear-gradient(135deg,var(--c-green),var(--c-blue));
    color:#fff; font-weight:700; font-size:13px;
    display:grid; place-items:center;
}
.step-icon { font-size:28px; margin-bottom:14px; margin-top:10px; }
.step-title { font-size:16px; font-weight:700; margin-bottom:8px; }
.step-desc { font-size:14px; color:var(--c-text-2); }

/* ── Hardware section ───────────────────────────────────────────────── */
.device-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; margin-bottom:32px; }
.device-card { background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius); padding:28px; }
.device-card h3 { font-size:18px; font-weight:700; margin-bottom:18px; display:flex; align-items:center; gap:8px; }
.pin-table { width:100%; border-collapse:collapse; }
.pin-table th,.pin-table td { padding:10px 14px; border-bottom:1px solid var(--c-border); font-size:14px; text-align:left; }
.pin-table th { color:var(--c-text-3); font-size:12px; text-transform:uppercase; letter-spacing:.05em; }
.pin-table td code { background:var(--c-bg-3); padding:2px 8px; border-radius:6px; font-family:monospace; font-size:13px; }
.gpio-alert {
    background:rgba(251,191,36,.1); border:1px solid rgba(251,191,36,.3);
    border-radius:var(--radius-sm); padding:18px 20px;
}
.gpio-alert h4 { color:#d97706; margin-bottom:10px; }
.gpio-alert li { color:var(--c-text-2); font-size:14px; margin-bottom:4px; padding-left:12px; position:relative; }
.gpio-alert li::before { content:'⚠'; position:absolute; left:-4px; font-size:11px; }

/* ── Library section ────────────────────────────────────────────────── */
.library-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; }
.library-card { background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius); padding:28px; }
.library-card h3 { font-size:18px; font-weight:700; margin-bottom:14px; }
.library-card p,.library-card li { color:var(--c-text-2); font-size:14px; margin-bottom:8px; }
pre { background:var(--c-bg-3); border:1px solid var(--c-border); border-radius:10px; padding:16px; overflow-x:auto; margin:12px 0; }
code { font-family:'SF Mono',Menlo,Monaco,monospace; font-size:13px; color:var(--c-green); }
pre code { color:var(--c-text); }

/* ── API section ────────────────────────────────────────────────────── */
.api-card { background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius); padding:28px; margin-bottom:16px; }
.api-header { display:flex; align-items:center; gap:12px; margin-bottom:12px; }
.method-badge {
    padding:4px 10px; border-radius:6px; font-size:12px; font-weight:700; font-family:monospace;
}
.method-GET    { background:rgba(14,165,233,.15); color:var(--c-blue); }
.method-POST   { background:rgba(16,185,129,.15); color:var(--c-green); }
.method-PUT    { background:rgba(251,191,36,.15);  color:#d97706; }
.method-DELETE { background:rgba(239,68,68,.15);   color:#dc2626; }
.method-PATCH  { background:rgba(168,85,247,.15);  color:#9333ea; }
.api-endpoint  { font-family:monospace; font-size:13px; color:var(--c-text-2); }
.auth-badge {
    margin-left:auto; padding:3px 10px; border-radius:50px; font-size:11px;
    background:var(--c-bg-3); color:var(--c-text-3);
}
.auth-badge.none { background:rgba(16,185,129,.12); color:var(--c-green); }
.api-title { font-size:15px; font-weight:600; margin-bottom:6px; }
.api-desc  { font-size:14px; color:var(--c-text-2); }

/* ── FAQ accordion ──────────────────────────────────────────────────── */
.faq-list { max-width:760px; margin:0 auto; }
.faq-item { border-bottom:1px solid var(--c-border); }
.faq-question {
    display:flex; justify-content:space-between; align-items:center;
    padding:20px 0; cursor:pointer; font-weight:600; font-size:16px;
    transition:color var(--transition);
}
.faq-question:hover { color:var(--c-green); }
.faq-chevron { transition:transform var(--transition); color:var(--c-text-3); font-size:18px; flex-shrink:0; margin-left:12px; }
.faq-item.open .faq-chevron { transform:rotate(180deg); color:var(--c-green); }
.faq-answer { max-height:0; overflow:hidden; transition:max-height .35s ease; }
.faq-answer p { padding:0 0 20px; color:var(--c-text-2); font-size:15px; line-height:1.7; }

/* ── Contact form ───────────────────────────────────────────────────── */
.contact-wrap { display:grid; grid-template-columns:1fr 1.6fr; gap:48px; align-items:start; }
.contact-info h3 { font-size:22px; font-weight:700; margin-bottom:14px; }
.contact-info p { color:var(--c-text-2); margin-bottom:24px; }
.contact-detail { display:flex; align-items:center; gap:12px; margin-bottom:16px; color:var(--c-text-2); font-size:15px; }
.contact-detail-icon { width:40px; height:40px; border-radius:10px; background:var(--c-bg-3); display:grid; place-items:center; font-size:18px; flex-shrink:0; }
.contact-form { background:var(--c-card); border:1px solid var(--c-border); border-radius:var(--radius); padding:32px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; margin-bottom:6px; font-size:13px; font-weight:600; color:var(--c-text-2); }
.form-group input,.form-group select,.form-group textarea {
    width:100%; padding:12px 14px; border-radius:10px;
    border:1.5px solid var(--c-border); background:var(--c-bg);
    color:var(--c-text); font-family:inherit; font-size:15px;
    transition:border-color var(--transition);
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus {
    outline:none; border-color:var(--c-green);
    box-shadow:0 0 0 3px rgba(16,185,129,.12);
}
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea { background:var(--c-bg-3); }
.form-message { margin-top:14px; padding:12px 16px; border-radius:10px; font-size:14px; display:none; }
.form-message.success { background:rgba(16,185,129,.12); color:var(--c-green); display:block; }
.form-message.error   { background:rgba(239,68,68,.12); color:#dc2626; display:block; }

/* ── Footer ─────────────────────────────────────────────────────────── */
.site-footer { background:var(--c-bg-2); border-top:1px solid var(--c-border); padding:56px 0 28px; }
.footer-grid { display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:32px; margin-bottom:40px; }
.footer-col h4 { font-size:15px; font-weight:700; margin-bottom:16px; }
.footer-col p  { font-size:14px; color:var(--c-text-2); margin-bottom:12px; }
.footer-col a  { display:block; font-size:14px; color:var(--c-text-2); margin-bottom:8px; }
.footer-col a:hover { color:var(--c-green); text-decoration:none; }
.footer-logo { display:flex; align-items:center; gap:8px; font-size:18px; font-weight:700; margin-bottom:14px; color:var(--c-text); }
.footer-bottom { border-top:1px solid var(--c-border); padding-top:20px; display:flex; justify-content:space-between; align-items:center; font-size:13px; color:var(--c-text-3); }

/* ── Floating WhatsApp ──────────────────────────────────────────────── */
.floating-wa {
    position:fixed; bottom:28px; right:28px; z-index:999;
    width:52px; height:52px; border-radius:50%;
    background:#25d366; color:#fff;
    display:grid; place-items:center; font-size:26px;
    box-shadow:0 4px 20px rgba(37,211,102,.45);
    transition:all var(--transition); text-decoration:none;
}
.floating-wa:hover { transform:scale(1.1) rotate(-5deg); text-decoration:none; color:#fff; }

/* ── Reveal animations ──────────────────────────────────────────────── */
.reveal {
    opacity:0; transform:translateY(30px);
    transition:opacity .6s ease, transform .6s ease;
}
.reveal.visible { opacity:1; transform:none; }

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width:900px) {
    .hero-content { grid-template-columns:1fr; text-align:center; }
    .hero-badges  { justify-content:center; }
    .hero-cta     { justify-content:center; }
    .hero-visual  { display:none; }
    .device-grid  { grid-template-columns:1fr; }
    .library-grid { grid-template-columns:1fr; }
    .contact-wrap { grid-template-columns:1fr; }
    .footer-grid  { grid-template-columns:1fr 1fr; }
    .stats-grid   { grid-template-columns:repeat(2,1fr); }
    .stat-item:nth-child(2) { border-right:none; }
}
@media (max-width:640px) {
    .nav-links { display:none; flex-direction:column; position:absolute; top:100%; left:0; right:0; background:var(--c-bg); border-bottom:1px solid var(--c-border); padding:16px; }
    .nav-links.open { display:flex; }
    .mobile-menu-btn { display:block; }
    .form-row { grid-template-columns:1fr; }
    .footer-grid { grid-template-columns:1fr; }
    .stats-grid { grid-template-columns:1fr 1fr; }
    section { padding:60px 0; }
    .contact-form { padding:20px; }
}