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

/* ===== CSS VARIABLES — DARK THEME (default) ===== */
:root {
  --bg-body: #0a0e1a;
  --bg-card: #12172b;
  --bg-card-alt: #161d33;
  --bg-input: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.07);
  --green: #00d084;
  --green-glow: rgba(0,208,132,0.18);
  --purple: #7c3aed;
  --purple-glow: rgba(124,58,237,0.15);
  --text: #f0f4f8;
  --text-sec: #8892a4;
  --warning: #facc15;
  --danger: #ef4444;
  --info: #3b82f6;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.25);
  --transition: .25s ease;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --header-bg: rgba(10,14,26,0.85);
  --sidebar-bg: #0f1322;
  --topbar-bg: rgba(18,23,43,0.85);
  --overlay-bg: rgba(0,0,0,0.55);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg-body: #f4f6fa;
  --bg-card: #ffffff;
  --bg-card-alt: #f9fafb;
  --bg-input: rgba(0,0,0,0.03);
  --border: rgba(0,0,0,0.08);
  --green: #00b870;
  --green-glow: rgba(0,184,112,0.12);
  --purple: #6d5dfc;
  --purple-glow: rgba(109,93,252,0.1);
  --text: #1a1a2e;
  --text-sec: #6b7280;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --header-bg: rgba(244,246,250,0.9);
  --sidebar-bg: #ffffff;
  --topbar-bg: rgba(255,255,255,0.9);
  --overlay-bg: rgba(0,0,0,0.3);
}

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{overflow-x:hidden;width:100%}
body{
  background:var(--bg-body);color:var(--text);font-family:var(--font);
  line-height:1.6;transition:background var(--transition),color var(--transition);
}
a{color:var(--green);text-decoration:none;transition:var(--transition)}
a:hover{opacity:.85}
img{max-width:100%;display:block}

/* ===== CONTAINER ===== */
.container{max-width:1200px;margin:0 auto;padding:0 20px;width:100%}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 22px;border-radius:var(--radius-sm);font-weight:600;font-size:.95rem;
  cursor:pointer;transition:var(--transition);border:none;font-family:var(--font);
}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 0 20px var(--green-glow)}
.btn-primary:hover{box-shadow:0 0 30px var(--green-glow);transform:translateY(-1px)}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--green);color:var(--green)}
.btn-sm{padding:6px 14px;font-size:.85rem}
.btn-block{width:100%}
.btn-icon{
  width:40px;height:40px;padding:0;border-radius:50%;
  background:var(--bg-input);border:1px solid var(--border);color:var(--text);
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  transition:var(--transition);font-size:1.1rem;
}
.btn-icon:hover{border-color:var(--green);color:var(--green)}

/* ===== CARD ===== */
.card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;transition:transform var(--transition),box-shadow var(--transition),background var(--transition);
  overflow:hidden;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}

/* ===== IMAGE PLACEHOLDER ===== */
.img-placeholder{
  width:100%;aspect-ratio:16/9;border-radius:var(--radius-sm);
  border:2px dashed var(--border);display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:8px;color:var(--text-sec);
  background:var(--bg-input);transition:var(--transition);overflow:hidden;
  position:relative;
}
.img-placeholder.square{aspect-ratio:1/1}
.img-placeholder.portrait{aspect-ratio:3/4}
.img-placeholder.hero-img{aspect-ratio:4/3}
.img-placeholder .icon{font-size:2rem;opacity:.5}
.img-placeholder .label{font-size:.8rem;opacity:.7}
.img-placeholder img{
  position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;
}

/* ===== STATUS ===== */
.status{display:inline-flex;align-items:center;gap:6px;font-size:.85rem}
.status-dot{width:8px;height:8px;border-radius:50%}
.status-dot.on{background:var(--green);box-shadow:0 0 8px var(--green)}
.status-dot.off{background:var(--danger);box-shadow:0 0 8px var(--danger)}

/* ===== BADGE ===== */
.badge{padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:600}
.badge-green{background:rgba(0,208,132,.12);color:var(--green)}
.badge-warning{background:rgba(250,204,21,.12);color:var(--warning)}
.badge-danger{background:rgba(239,68,68,.12);color:var(--danger)}
.badge-info{background:rgba(59,130,246,.12);color:var(--info)}

/* ===== FORMS ===== */
.form-group{margin-bottom:20px}
.form-group label{display:block;margin-bottom:6px;font-size:.9rem;color:var(--text-sec);font-weight:500}
.form-control{
  width:100%;padding:11px 14px;background:var(--bg-input);border:1px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text);font-size:.95rem;font-family:var(--font);
  transition:var(--transition);
}
.form-control:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px var(--green-glow)}
select.form-control{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238892a4' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}
select.form-control option{background:var(--bg-card);color:var(--text)}

/* ===== TOGGLE SWITCH ===== */
.switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.slider{position:absolute;cursor:pointer;inset:0;background:var(--text-sec);transition:.3s;border-radius:24px}
.slider::before{content:"";position:absolute;height:18px;width:18px;left:3px;bottom:3px;background:#fff;transition:.3s;border-radius:50%}
input:checked+.slider{background:var(--green)}
input:checked+.slider::before{transform:translateX(20px)}

/* ===== LANGUAGE SWITCHER ===== */
.lang-sw{display:flex;gap:2px;background:var(--bg-input);border-radius:6px;padding:2px}
.lang-btn{
  background:transparent;border:none;color:var(--text-sec);padding:4px 8px;
  border-radius:4px;cursor:pointer;font-size:.8rem;font-weight:600;
  transition:var(--transition);font-family:var(--font);
}
.lang-btn.active{background:var(--green);color:#fff}
.lang-btn:hover:not(.active){color:var(--text)}
.lang-btn.loading{opacity:.4;pointer-events:none}

/* ===== THEME TOGGLE ===== */
.theme-toggle{
  width:38px;height:38px;border-radius:50%;border:1px solid var(--border);
  background:var(--bg-input);cursor:pointer;display:flex;align-items:center;
  justify-content:center;font-size:1.1rem;transition:var(--transition);color:var(--text);
}
.theme-toggle:hover{border-color:var(--green);color:var(--green)}

/* ============================================
   HEADER / NAVBAR
   ============================================ */
.navbar{
  position:sticky;top:0;z-index:100;background:var(--header-bg);
  backdrop-filter:blur(16px);border-bottom:1px solid var(--border);
  transition:background var(--transition);
}
.navbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;gap:20px;
}
.logo{font-size:1.35rem;font-weight:800;color:var(--text);white-space:nowrap;display:flex;align-items:center;gap:6px}
.logo span{color:var(--green)}
.nav-center{display:flex;gap:28px;align-items:center}
.nav-center a{color:var(--text-sec);font-size:.9rem;font-weight:500;white-space:nowrap}
.nav-center a:hover{color:var(--green)}
.nav-right{display:flex;align-items:center;gap:10px}
.burger{
  display:none;width:38px;height:38px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:transparent;cursor:pointer;flex-direction:column;align-items:center;
  justify-content:center;gap:5px;
}
.burger span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}

/* Mobile drawer */
.mobile-drawer{
  display:none;position:fixed;top:64px;left:0;right:0;bottom:0;z-index:90;
}
.mobile-drawer.open{display:flex}
.mobile-drawer-overlay{position:absolute;inset:0;background:var(--overlay-bg)}
.mobile-drawer-panel{
  position:relative;width:280px;max-width:80vw;background:var(--bg-card);
  border-right:1px solid var(--border);padding:24px;display:flex;flex-direction:column;
  gap:16px;overflow-y:auto;z-index:1;animation:slideIn .25s ease;
}
@keyframes slideIn{from{transform:translateX(-100%)}to{transform:translateX(0)}}
.mobile-drawer-panel a{color:var(--text);font-size:1rem;padding:10px 0;border-bottom:1px solid var(--border)}
.mobile-drawer-panel a:hover{color:var(--green)}

/* ============================================
   HERO
   ============================================ */
.hero{padding:80px 0 60px;display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.hero-title{font-size:3.2rem;font-weight:800;line-height:1.15;margin-bottom:16px}
.hero-title .accent{color:var(--green)}
.hero-sub{color:var(--text-sec);font-size:1.1rem;margin-bottom:32px;max-width:520px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-visual{position:relative}
.hero-visual .img-placeholder{aspect-ratio:4/3;border-radius:var(--radius);font-size:.9rem}
.hero-glow{
  position:absolute;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,var(--green-glow),transparent 70%);
  top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;z-index:0;
}
.hero-visual .img-placeholder{position:relative;z-index:1}

/* ============================================
   SECTIONS
   ============================================ */
.section{padding:80px 0;overflow:hidden}
.section-header{text-align:center;max-width:600px;margin:0 auto 48px}
.section-tag{
  display:inline-block;font-size:.8rem;font-weight:600;text-transform:uppercase;
  letter-spacing:1.5px;color:var(--green);margin-bottom:10px;
}
.section-title{font-size:2.2rem;font-weight:800;margin-bottom:12px}
.section-desc{color:var(--text-sec);font-size:1rem}

.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* Feature card */
.feature-card{padding:28px}
.feature-card .feature-icon{
  width:48px;height:48px;border-radius:12px;display:flex;align-items:center;
  justify-content:center;font-size:1.4rem;margin-bottom:16px;
  background:linear-gradient(135deg,var(--green-glow),var(--purple-glow));
}
.feature-card h3{font-size:1.1rem;margin-bottom:8px;font-weight:700}
.feature-card p{color:var(--text-sec);font-size:.9rem}
.feature-card .img-placeholder{margin-top:16px;aspect-ratio:2/1}

/* Steps */
.step-card{text-align:center;padding:32px 24px}
.step-num{
  width:44px;height:44px;border-radius:50%;display:inline-flex;align-items:center;
  justify-content:center;font-weight:800;font-size:1.1rem;margin-bottom:16px;
  background:linear-gradient(135deg,var(--green),var(--purple));color:#fff;
}
.step-card h3{font-size:1.05rem;margin-bottom:8px}
.step-card p{color:var(--text-sec);font-size:.9rem}

/* Industry tags */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tag{
  padding:8px 18px;border-radius:20px;border:1px solid var(--border);
  font-size:.9rem;color:var(--text-sec);transition:var(--transition);cursor:default;
}
.tag:hover{border-color:var(--green);color:var(--green)}

/* Pricing */
.pricing-card{text-align:center;padding:32px;position:relative}
.pricing-card.featured{border-color:var(--green);box-shadow:0 0 30px var(--green-glow)}
.pricing-badge{
  position:absolute;top:-1px;left:50%;transform:translateX(-50%);
  background:var(--green);color:#fff;padding:4px 16px;border-radius:0 0 8px 8px;
  font-size:.75rem;font-weight:700;
}
.pricing-card h3{font-size:1.3rem;margin:8px 0 16px}
.pricing-price{font-size:1rem;color:var(--text-sec);margin-bottom:24px}

/* FAQ */
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;transition:var(--transition)}
.faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem}
.faq-q .arrow{transition:transform .3s;font-size:.8rem;color:var(--text-sec)}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{display:none;padding:0 20px 16px;color:var(--text-sec);font-size:.9rem}
.faq-item.open .faq-a{display:block}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info h3{margin-bottom:16px}
.contact-info p{color:var(--text-sec);margin-bottom:24px}
.contact-info .img-placeholder{aspect-ratio:4/3}

/* Footer */
.footer{border-top:1px solid var(--border);padding:40px 0;margin-top:60px}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-copy{color:var(--text-sec);font-size:.85rem}

/* ============================================
   LOGIN
   ============================================ */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}
.login-card{max-width:420px;width:100%;padding:40px}

/* ============================================
   DASHBOARD LAYOUT
   ============================================ */
.dash{display:flex;min-height:100vh;width:100%;position:relative}
.sidebar-overlay{display:none;position:fixed;inset:0;background:var(--overlay-bg);z-index:45}
.sidebar-overlay.active{display:block}

.sidebar{
  width:240px;background:var(--sidebar-bg);border-right:1px solid var(--border);
  position:fixed;top:0;bottom:0;left:0;display:flex;flex-direction:column;
  z-index:50;transition:transform .3s;overflow-y:auto;
}
.sidebar-head{padding:18px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.sidebar-close{display:none;background:none;border:none;color:var(--text);font-size:1.4rem;cursor:pointer}
.sidebar-nav{flex:1;padding:12px 0}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:11px 20px;color:var(--text-sec);
  font-size:.9rem;font-weight:500;transition:var(--transition);border-left:3px solid transparent;
}
.nav-item:hover,.nav-item.active{color:var(--green);background:var(--bg-input);border-left-color:var(--green)}
.sidebar-foot{padding:16px 20px;border-top:1px solid var(--border)}

.dash-main{flex:1;margin-left:240px;display:flex;flex-direction:column;min-height:100vh;width:calc(100% - 240px)}
.topbar{
  height:64px;background:var(--topbar-bg);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;padding:0 24px;
  position:sticky;top:0;z-index:40;gap:16px;
}
.topbar-left{display:flex;align-items:center;gap:12px}
.topbar-right{display:flex;align-items:center;gap:12px}
.topbar-burger{display:none;background:none;border:none;color:var(--text);font-size:1.3rem;cursor:pointer}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--purple);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;color:#fff;flex-shrink:0}

.dash-content{padding:24px;flex:1;width:100%;overflow-x:hidden}
.page-title{font-size:1.6rem;font-weight:700;margin-bottom:24px}

/* Stat cards grid */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.stat-card{padding:20px}
.stat-card .stat-label{font-size:.85rem;color:var(--text-sec);margin-bottom:6px}
.stat-card .stat-value{font-size:1.6rem;font-weight:700}
.stat-card .stat-value.green{color:var(--green)}

/* Tables */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-card)}
table{width:100%;border-collapse:collapse;white-space:nowrap}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border);font-size:.9rem}
th{color:var(--text-sec);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.5px}
tr:hover{background:var(--bg-input)}

/* Tabs */
.tabs{display:flex;gap:4px;padding:4px;background:var(--bg-input);border-radius:var(--radius-sm);flex-wrap:wrap;margin-bottom:24px;width:fit-content}
.tab{padding:8px 16px;border-radius:6px;color:var(--text-sec);cursor:pointer;font-size:.85rem;font-weight:600;transition:var(--transition);white-space:nowrap}
.tab.active{background:var(--green);color:#fff}
.tab:hover:not(.active){color:var(--text)}

/* Filter bar */
.filter-bar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:24px}
.filter-bar select{width:auto;min-width:160px}

/* Chart container */
.chart-box{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}
.chart-box h3{font-size:1.1rem;font-weight:700;margin-bottom:16px}
.chart-area{width:100%;height:300px;position:relative}

/* Device card */
.device-card{padding:20px}
.device-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:16px}
.device-meta{font-size:.85rem;color:var(--text-sec)}
.device-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0;text-align:center}
.device-stats .ds-val{font-size:1.2rem;font-weight:700}
.device-stats .ds-label{font-size:.75rem;color:var(--text-sec)}
.device-footer{display:flex;justify-content:space-between;align-items:center;padding-top:16px;border-top:1px solid var(--border)}

/* Alert card */
.alert-card{padding:20px;border-left:4px solid var(--border)}
.alert-card.level-danger{border-left-color:var(--danger)}
.alert-card.level-warning{border-left-color:var(--warning)}
.alert-card.level-info{border-left-color:var(--info)}
.alert-card.level-success{border-left-color:var(--green)}
.alert-card.unread{background:var(--bg-card-alt)}
.alert-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.alert-head h3{font-size:1rem}
.alert-time{font-size:.8rem;color:var(--text-sec)}

/* Utility */
.d-flex{display:flex}.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}
.items-center{align-items:center}.justify-between{justify-content:space-between}
.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.gap-24{gap:24px}
.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}
.mt-16{margin-top:16px}.mt-24{margin-top:24px}
.text-center{text-align:center}.text-green{color:var(--green)}.text-sec{color:var(--text-sec)}
.text-danger{color:var(--danger)}.text-warning{color:var(--warning)}

/* ============================================
   RESPONSIVE
   ============================================ */
@media(max-width:1200px){
  .hero-title{font-size:2.6rem}
  .nav-center{gap:20px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:1024px){
  .dash-main{margin-left:0;width:100%}
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-close{display:block}
  .topbar-burger{display:block}
  .sidebar-overlay.active{display:block}
}

@media(max-width:768px){
  .nav-center,.nav-right .btn,.nav-right .lang-sw{display:none}
  .burger{display:flex}
  .hero{grid-template-columns:1fr;text-align:center;padding:40px 0}
  .hero-sub{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:48px 0}
  .section-title{font-size:1.6rem}
  .footer-inner{flex-direction:column;text-align:center}
  .filter-bar{flex-direction:column;align-items:stretch}
  .filter-bar select{width:100%}
  .tabs{width:100%}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:576px){
  .hero-title{font-size:2rem}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .stat-grid{grid-template-columns:1fr}
  .device-stats{grid-template-columns:1fr;text-align:left}
  .pricing-card{padding:24px}
  .dash-content{padding:16px}
  .card{padding:16px}
  .topbar{padding:0 16px}
  .alert-head{flex-direction:column;align-items:flex-start;gap:4px}
}

@media(max-width:375px){
  .hero-title{font-size:1.7rem}
  .section-title{font-size:1.4rem}
  .btn{font-size:.85rem;padding:8px 16px}
}