:root{--primary:#2563eb;--primary-dark:#1d4ed8;--success:#16a34a;--warning:#f59e0b;--danger:#dc2626;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.1)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:var(--gray-800);line-height:1.6;background:#fff}
a{color:var(--primary);text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
button,.btn{cursor:pointer;font-family:inherit;border:none;border-radius:var(--radius);font-weight:600;transition:all .2s}
.btn-primary{background:var(--primary);color:#fff;padding:12px 24px;font-size:16px}.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:var(--gray-100);color:var(--gray-700);padding:10px 20px;font-size:14px;border:1px solid var(--gray-200)}.btn-secondary:hover{background:var(--gray-200)}
.btn-sm{padding:6px 14px;font-size:13px}
.btn-danger{background:var(--danger);color:#fff;padding:8px 16px}
input,select,textarea{font-family:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--gray-300);border-radius:var(--radius);width:100%;outline:none;transition:border .2s}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
label{font-weight:500;font-size:14px;color:var(--gray-700);display:block;margin-bottom:4px}
/* NAV */
nav{background:#fff;border-bottom:1px solid var(--gray-200);padding:12px 0;position:sticky;top:0;z-index:100}
nav .container{display:flex;justify-content:space-between;align-items:center}
.logo{font-size:20px;font-weight:800;color:var(--gray-900)}.logo span{color:var(--primary)}
nav ul{list-style:none;display:flex;gap:8px}
nav a{color:var(--gray-600);padding:8px 14px;border-radius:var(--radius);font-weight:500;font-size:14px}
nav a:hover,nav a.active{background:var(--gray-100);color:var(--gray-900)}
/* HERO */
.hero{padding:80px 0;text-align:center;background:linear-gradient(135deg,#eff6ff 0%,#fff 100%)}
.hero h1{font-size:48px;font-weight:800;color:var(--gray-900);line-height:1.1;max-width:700px;margin:0 auto}
.hero p{font-size:20px;color:var(--gray-500);margin:16px auto 0;max-width:550px}
.hero .btn-primary{margin-top:32px;padding:16px 40px;font-size:18px}
/* SECTIONS */
.section{padding:60px 0}
.section h2{font-size:32px;font-weight:700;text-align:center;margin-bottom:12px}
.section .subtitle{text-align:center;color:var(--gray-500);margin-bottom:40px;font-size:18px}
.pain{background:var(--gray-50);padding:40px 0;text-align:center}
.pain p{font-size:18px;color:var(--gray-600);max-width:600px;margin:0 auto}
.pain strong{color:var(--danger)}
/* FEATURES */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px}
.feature-card{padding:24px;border:1px solid var(--gray-200);border-radius:12px;text-align:center}
.feature-card .icon{font-size:36px;margin-bottom:12px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{color:var(--gray-500);font-size:14px}
/* PRICING */
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;max-width:900px;margin:0 auto}
.price-card{border:2px solid var(--gray-200);border-radius:12px;padding:32px;text-align:center}
.price-card.popular{border-color:var(--primary);position:relative}
.price-card.popular::before{content:'MOST POPULAR';position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;padding:2px 12px;border-radius:12px;font-size:11px;font-weight:700}
.price-card .price{font-size:42px;font-weight:800;color:var(--gray-900)}.price-card .price span{font-size:16px;color:var(--gray-400);font-weight:400}
.price-card h3{font-size:20px;margin-bottom:4px}
.price-card ul{list-style:none;margin:20px 0;text-align:left}
.price-card li{padding:6px 0;font-size:14px;color:var(--gray-600)}
.price-card li::before{content:'✓ ';color:var(--success);font-weight:700}
/* DASHBOARD */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:#fff;border:1px solid var(--gray-200);border-radius:12px;padding:20px}
.stat-card .label{font-size:13px;color:var(--gray-500);text-transform:uppercase;letter-spacing:.5px}
.stat-card .value{font-size:28px;font-weight:700;color:var(--gray-900);margin-top:4px}
.stat-card .count{font-size:13px;color:var(--gray-400)}
.stat-card.danger .value{color:var(--danger)}
/* TABLE */
.table-wrap{background:#fff;border:1px solid var(--gray-200);border-radius:12px;overflow:hidden}
table{width:100%;border-collapse:collapse}
th{background:var(--gray-50);text-align:left;padding:12px 16px;font-size:13px;color:var(--gray-500);text-transform:uppercase;letter-spacing:.5px}
td{padding:12px 16px;border-top:1px solid var(--gray-100);font-size:14px}
tr:hover{background:var(--gray-50)}
.badge{display:inline-block;padding:2px 10px;border-radius:12px;font-size:12px;font-weight:600}
.badge-draft{background:var(--gray-100);color:var(--gray-600)}
.badge-sent{background:#dbeafe;color:#1e40af}
.badge-viewed{background:#e0e7ff;color:#3730a3}
.badge-paid{background:#dcfce7;color:#166534}
.badge-overdue{background:#fee2e2;color:#991b1b}
/* MODAL */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:200;align-items:center;justify-content:center}
.modal-overlay.active{display:flex}
.modal{background:#fff;border-radius:12px;padding:32px;width:90%;max-width:640px;max-height:90vh;overflow-y:auto}
.modal h2{margin-bottom:20px}
.form-row{margin-bottom:16px}
.form-row-inline{display:flex;gap:12px}
.form-row-inline>*{flex:1}
/* LINE ITEMS */
.line-items{margin:16px 0}
.line-item{display:flex;gap:8px;margin-bottom:8px;align-items:center}
.line-item input{font-size:13px;padding:8px}
.line-item .desc{flex:3}.line-item .qty{flex:1}.line-item .rate{flex:1}.line-item .amt{flex:1;text-align:right;font-weight:600;font-size:13px;color:var(--gray-600)}
.remove-item{background:none;color:var(--gray-400);font-size:18px;width:30px;padding:0}
.remove-item:hover{color:var(--danger)}
.totals-section{text-align:right;padding:16px 0;border-top:1px solid var(--gray-200)}
.totals-section .grand-total{font-size:24px;font-weight:700}
/* TABS */
.tabs{display:flex;gap:4px;margin-bottom:24px;border-bottom:2px solid var(--gray-200);padding-bottom:0}
.tab{padding:10px 16px;font-weight:500;color:var(--gray-500);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;font-size:14px}
.tab.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-content{display:none}.tab-content.active{display:block}
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:12px}
/* FOOTER */
footer{background:var(--gray-900);color:var(--gray-400);padding:40px 0;text-align:center;font-size:14px}
footer a{color:var(--gray-300)}
/* LOGIN */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--gray-50)}
.login-card{background:#fff;padding:40px;border-radius:12px;box-shadow:var(--shadow);width:90%;max-width:400px;text-align:center}
.login-card h1{margin-bottom:8px}.login-card p{color:var(--gray-500);margin-bottom:24px}
.login-card input{margin-bottom:16px}
.login-card .btn-primary{width:100%}
.success-msg{background:#dcfce7;color:#166534;padding:12px;border-radius:var(--radius);margin-top:16px;display:none}
/* APP */
.app-layout{min-height:100vh;background:var(--gray-50)}
.app-content{padding:24px 0}
.empty-state{text-align:center;padding:60px 20px;color:var(--gray-400)}
.empty-state .icon{font-size:48px;margin-bottom:12px}
@media(max-width:768px){
.hero h1{font-size:32px}.hero p{font-size:16px}
.stats-grid{grid-template-columns:1fr 1fr}
.modal{padding:20px;width:95%}
.line-item{flex-wrap:wrap}.line-item .desc{flex:1 1 100%}
.table-wrap{overflow-x:auto}
nav ul{gap:2px}nav a{padding:8px 10px;font-size:13px}
}