/* ===== VARIABLES ===== */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --success: #16A34A;
  --success-dark: #15803D;
  --bg: #F8FAFC;
  --white: #FFFFFF;
  --text: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,.1);
  --radius: 8px;
}

body.dark {
  --bg: #0F172A;
  --white: #1E293B;
  --text: #F1F5F9;
  --text-muted: #94A3B8;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
}
body.dark #site-header { background: #1E293B; }
body.dark .form-panel,
body.dark fieldset,
body.dark .faq-q,
body.dark .faq-a,
body.dark .step-card,
body.dark .blog-card,
body.dark #invoice-preview,
body.dark .history-modal-content,
body.dark .history-card { background: var(--white); }
body.dark input,body.dark textarea,body.dark select { background:#0F172A;color:var(--text);border-color:var(--border); }
body.dark .btn-outline,body.dark .btn-ghost { background:var(--white);color:var(--text-muted);border-color:var(--border); }
body.dark footer { background:#020617; }
body.dark .ad-slot { background:#1E293B;border-color:#334155;color:#475569; }

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px;scroll-behavior:smooth;overflow-x:hidden;width:100%}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;width:100%;min-height:100vh}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
button{cursor:pointer;font-family:inherit}
textarea{resize:vertical}

/* ===== LAYOUT ===== */
.container{max-width:1200px;margin:0 auto;padding:0 16px;width:100%}
body{overflow-x:hidden}
#site-header,footer,.hero,.tool-grid,.how-section,.faq-section,.blog-section{max-width:100%;overflow-x:hidden}

/* ===== HEADER ===== */
#site-header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;transition:box-shadow .2s}
#site-header.scrolled{box-shadow:0 2px 12px rgba(0,0,0,.1)}
#site-header .inner{display:flex;align-items:center;justify-content:space-between;height:58px}
.site-logo{font-size:1.2rem;font-weight:700;color:var(--primary);letter-spacing:-.5px;white-space:nowrap}
.site-logo span{color:var(--text)}
nav{display:flex;align-items:center;gap:4px}
nav a{padding:6px 10px;font-size:.85rem;color:var(--text-muted);font-weight:500;border-radius:6px;transition:color .15s}
nav a:hover{color:var(--primary);text-decoration:none}
.btn-nav{background:var(--success);color:var(--white)!important;padding:7px 14px;border-radius:6px;font-size:.85rem;font-weight:600}
.btn-nav:hover{background:var(--success-dark);text-decoration:none!important}
.btn-theme{background:none;border:1px solid var(--border);border-radius:6px;padding:5px 9px;font-size:1rem;cursor:pointer;line-height:1;transition:background .15s}
.btn-theme:hover{background:var(--bg)}

/* ===== HERO ===== */
.hero{padding:36px 0 20px;text-align:center}
.hero h1{font-size:2.1rem;font-weight:700;color:var(--text);margin-bottom:10px;line-height:1.25}
.hero p{color:var(--text-muted);font-size:1rem;max-width:540px;margin:0 auto 18px}
.trust-badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:10px}
.badge{background:#EFF6FF;color:var(--primary);border:1px solid #BFDBFE;border-radius:20px;padding:5px 14px;font-size:.8rem;font-weight:500}
.hero-arrow{color:var(--text-muted);font-size:1.4rem;animation:bounce .8s ease infinite alternate}
@keyframes bounce{to{transform:translateY(6px)}}

/* ===== AD SLOTS ===== */
.ad-slot{background:#F1F5F9;border:1px dashed #CBD5E1;display:flex;align-items:center;justify-content:center;color:#94A3B8;font-size:.7rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}
.ad-leaderboard{width:100%;height:90px;margin:12px 0;border-radius:var(--radius)}
.ad-rectangle{width:300px;max-width:100%;height:250px;margin:0 auto 16px;border-radius:var(--radius)}
.ad-banner{width:100%;max-width:320px;height:100px;margin:16px auto;border-radius:var(--radius)}
@media(max-width:600px){.ad-banner{max-width:100%}}
@media(max-width:768px){.ad-leaderboard{height:50px}}

/* ===== MAIN TOOL GRID ===== */
.tool-grid{display:grid;grid-template-columns:55% 1fr;gap:24px;padding:8px 0 40px;align-items:start}

/* ===== FORM PANEL ===== */
.form-panel{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:24px;box-shadow:var(--shadow);min-width:0}
fieldset{border:none;margin-bottom:20px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;min-width:0}
legend{font-size:.78rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;padding:0 6px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:10px}
.form-row.full{grid-template-columns:1fr}
.form-group{display:flex;flex-direction:column;gap:4px;min-width:0}
label{font-size:.78rem;font-weight:500;color:#475569}
input[type=text],input[type=email],input[type=date],input[type=number],input[type=tel],textarea,select{
  width:100%;max-width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;
  font-family:inherit;font-size:.875rem;color:var(--text);background:var(--white);transition:border-color .15s}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
textarea{min-height:72px}

/* Logo upload */
.logo-upload-area{border:2px dashed var(--border);border-radius:var(--radius);padding:12px;text-align:center;cursor:pointer;transition:border-color .15s;position:relative}
.logo-upload-area:hover{border-color:var(--primary)}
.logo-upload-area input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.logo-upload-area p{font-size:.78rem;color:#94A3B8;margin:0;pointer-events:none}
#logo-preview{max-height:56px;max-width:150px;display:none;margin:6px auto 0;border-radius:4px}

/* Currency */
.currency-row{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.currency-row label{white-space:nowrap;margin:0;font-weight:600;font-size:.85rem}
.currency-row select{max-width:220px}

/* Due date quick buttons */
.quick-btns{display:flex;gap:5px;margin-top:5px;flex-wrap:wrap}
.quick-btn{background:#EFF6FF;color:var(--primary);border:1px solid #BFDBFE;border-radius:4px;padding:3px 9px;font-size:.75rem;font-weight:600;cursor:pointer;transition:background .15s}
.quick-btn:hover{background:#DBEAFE}

/* Client database row */
.client-db-row{display:flex;gap:6px;align-items:center;margin-bottom:10px}
.client-db-row select{flex:1;font-size:.82rem}
.btn-client-save{background:var(--primary);color:#fff;border:none;border-radius:6px;padding:6px 10px;font-size:.78rem;font-weight:600;cursor:pointer;white-space:nowrap}
.btn-client-save:hover{background:var(--primary-dark)}
.btn-client-del{background:var(--bg);color:#EF4444;border:1px solid var(--border);border-radius:6px;padding:6px 8px;font-size:.82rem;cursor:pointer}
.btn-client-del:hover{background:#FEF2F2}

/* Total in words */
.inv-total-words{font-size:.68rem;color:var(--text-muted);font-style:italic;margin-top:4px;padding-top:4px;border-top:1px dashed var(--border)}

/* ===== LINE ITEMS ===== */
.items-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.items-table{width:100%;border-collapse:collapse;margin-bottom:10px;font-size:.84rem}
.items-table th{background:var(--bg);font-weight:600;color:var(--text-muted);padding:8px 6px;text-align:left;border-bottom:2px solid var(--border);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em}
.items-table td{padding:5px 4px;border-bottom:1px solid #F1F5F9;vertical-align:middle}
.items-table th:nth-child(1),.items-table td:nth-child(1){width:6%;text-align:center;color:var(--text-muted)}
.items-table th:nth-child(2),.items-table td:nth-child(2){width:38%}
.items-table th:nth-child(3),.items-table td:nth-child(3){width:14%}
.items-table th:nth-child(4),.items-table td:nth-child(4){width:16%}
.items-table th:nth-child(5),.items-table td:nth-child(5){width:16%;text-align:right}
.items-table th:nth-child(6),.items-table td:nth-child(6){width:10%;text-align:center}
.item-amount{font-weight:500;padding-right:4px}
.btn-del{background:none;border:none;color:#EF4444;font-size:1.1rem;padding:2px 6px;border-radius:4px;transition:background .15s}
.btn-del:hover{background:#FEF2F2}
.btn-add-item{background:#EFF6FF;color:var(--primary);border:1px solid #BFDBFE;border-radius:6px;padding:8px 16px;font-size:.84rem;font-weight:600;margin-bottom:14px;transition:background .15s}
.btn-add-item:hover{background:#DBEAFE}

/* Totals */
.totals-section{margin-left:auto;max-width:300px}
.totals-row{display:flex;justify-content:space-between;align-items:center;padding:5px 0;font-size:.875rem;color:#475569;border-bottom:1px solid #F8FAFC}
.totals-row input[type=number]{width:64px;text-align:right;padding:3px 6px;font-size:.84rem}
.totals-row.grand{font-size:1.05rem;font-weight:700;color:var(--text);border-top:2px solid var(--text);border-bottom:none;padding-top:8px;margin-top:4px}

/* ===== ACTION BAR ===== */
.action-bar{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 18px;border-radius:var(--radius);font-size:.875rem;font-weight:600;border:none;transition:all .15s;white-space:nowrap}
.btn-success{background:var(--success);color:var(--white)}
.btn-success:hover{background:var(--success-dark)}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{background:var(--white);color:#475569;border:1px solid var(--border)}
.btn-outline:hover{background:var(--bg)}
.btn-ghost{background:var(--bg);color:var(--text-muted);border:1px solid var(--border)}
.btn-ghost:hover{background:#F1F5F9}
.autosave-pill{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;color:var(--success);background:#F0FDF4;border:1px solid #BBF7D0;border-radius:20px;padding:3px 10px;margin-top:8px;height:22px;opacity:0;transition:opacity .3s}

/* ===== PREVIEW PANEL ===== */
.preview-panel{position:sticky;top:70px;min-width:0}
.preview-label{font-size:.75rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}

/* Invoice preview */
#invoice-preview{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 4px 24px rgba(0,0,0,.1);padding:32px;font-size:.8rem;color:var(--text);line-height:1.5;min-width:0;overflow-wrap:break-word}
.inv-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px;gap:12px}
.inv-logo{max-height:60px;max-width:130px;object-fit:contain}
.inv-logo-placeholder{width:70px;height:36px;background:#F1F5F9;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:.6rem;color:#94A3B8}
.inv-title-block{text-align:right}
.inv-title{font-size:1.7rem;font-weight:800;color:var(--primary);letter-spacing:1px}
.inv-meta{font-size:.72rem;color:var(--text-muted);margin-top:4px}
.inv-meta strong{color:var(--text)}
.inv-parties{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--border)}
.inv-party-label{font-size:.62rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;margin-bottom:3px}
.inv-party-name{font-weight:700;font-size:.88rem}
.inv-party-detail{font-size:.75rem;color:var(--text-muted);overflow-wrap:break-word;word-break:break-word}
.inv-table{width:100%;border-collapse:collapse;margin-bottom:18px}
.inv-table th{background:var(--primary);color:var(--white);font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;padding:7px 8px;text-align:left}
.inv-table th:last-child,.inv-table td:last-child{text-align:right}
.inv-table tr:nth-child(even) td{background:#F8FAFC}
.inv-table td{padding:6px 8px;font-size:.78rem;border-bottom:1px solid #F1F5F9}
.inv-totals{margin-left:auto;max-width:190px}
.inv-tr{display:flex;justify-content:space-between;font-size:.78rem;padding:3px 0;color:var(--text-muted)}
.inv-tr.grand{font-size:.92rem;font-weight:700;color:var(--text);border-top:2px solid var(--text);padding-top:5px;margin-top:3px}
.inv-notes{margin-top:18px;padding-top:14px;border-top:1px solid var(--border);font-size:.76rem;color:var(--text-muted)}
.inv-notes strong{display:block;color:var(--text);margin-bottom:2px;font-size:.78rem}
.inv-footer-line{margin-top:20px;text-align:center;font-size:.62rem;color:#CBD5E1;border-top:1px solid #F1F5F9;padding-top:8px}

/* ===== SHARE BANNER ===== */
#share-banner{display:none;background:#EFF6FF;border:1px solid #BFDBFE;border-radius:var(--radius);padding:14px 16px;margin-top:14px;text-align:center;animation:slideUp .3s ease}
@keyframes slideUp{from{transform:translateY(10px);opacity:0}to{transform:translateY(0);opacity:1}}
#share-banner p{font-size:.875rem;font-weight:600;margin-bottom:10px}
.share-btns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.btn-twitter{background:#000;color:var(--white)}
.btn-twitter:hover{background:#333}
.btn-whatsapp{background:#25D366;color:var(--white)}
.btn-whatsapp:hover{background:#1ebe5d}

/* ===== TOAST ===== */
#toast{position:fixed;bottom:24px;right:24px;background:var(--text);color:var(--white);padding:10px 18px;border-radius:var(--radius);font-size:.85rem;font-weight:500;z-index:9999;opacity:0;transform:translateY(8px);transition:opacity .25s,transform .25s;pointer-events:none}
#toast.show{opacity:1;transform:translateY(0)}

/* ===== HOW IT WORKS ===== */
.how-section{padding:40px 24px;border-top:1px solid var(--border)}
.how-section h2,.faq-section h2,.blog-section h2{font-size:1.5rem;font-weight:700;text-align:center;margin-bottom:24px}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step-card{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:24px;text-align:center;box-shadow:var(--shadow)}
.step-num{width:44px;height:44px;background:var(--primary);color:var(--white);border-radius:50%;font-size:1.1rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 12px}
.step-card h3{font-size:.95rem;font-weight:600;margin-bottom:6px}
.step-card p{font-size:.84rem;color:var(--text-muted);margin:0}

/* ===== FAQ ===== */
.faq-section{padding:40px 24px;border-top:1px solid var(--border)}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;overflow:hidden}
.faq-q{width:100%;background:var(--white);border:none;text-align:left;padding:14px 16px;font-size:.9rem;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:inherit;color:var(--text);transition:background .15s}
.faq-q:hover{background:var(--bg)}
.faq-q .arrow{transition:transform .25s;color:var(--text-muted);font-size:.8rem}
.faq-q[aria-expanded=true]{background:#EFF6FF}
.faq-q[aria-expanded=true] .arrow{transform:rotate(180deg);color:var(--primary)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;font-size:.875rem;color:#475569;padding:0 16px;background:var(--white)}
.faq-a.open{max-height:300px;padding:0 16px 14px}

/* ===== BLOG CARDS ===== */
.blog-section{padding:40px 24px;border-top:1px solid var(--border)}
.blog-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.blog-card{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow);transition:box-shadow .2s,transform .2s}
.blog-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.1);transform:translateY(-2px)}
.blog-card-tag{font-size:.72rem;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}
.blog-card h3{font-size:.9rem;font-weight:600;margin-bottom:6px;color:var(--text);line-height:1.4}
.blog-card p{font-size:.8rem;color:var(--text-muted);margin:0 0 10px}
.blog-card a.read-more{font-size:.8rem;font-weight:600;color:var(--primary)}

/* ===== BLOG PAGE ===== */
.blog-hero{background:linear-gradient(135deg,#EFF6FF,#F8FAFC);padding:40px 0 28px;border-bottom:1px solid var(--border)}
.blog-hero .breadcrumb{font-size:.8rem;color:var(--text-muted);margin-bottom:10px}
.blog-hero .breadcrumb a{color:var(--text-muted)}
.blog-hero h1{font-size:1.9rem;font-weight:700;max-width:700px;line-height:1.3;margin-bottom:10px}
.blog-hero .meta{font-size:.82rem;color:var(--text-muted)}
.blog-body{max-width:760px;margin:0 auto;padding:32px 16px 60px}
.blog-body h2{font-size:1.25rem;font-weight:700;margin:28px 0 10px;color:var(--text)}
.blog-body h3{font-size:1rem;font-weight:600;margin:20px 0 8px}
.blog-body p{color:#475569;margin-bottom:14px;line-height:1.75}
.blog-body ul,.blog-body ol{padding-left:22px;margin-bottom:14px;color:#475569}
.blog-body li{margin-bottom:6px;line-height:1.7}
.blog-body table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.875rem}
.blog-body th{background:var(--primary);color:var(--white);padding:9px 12px;text-align:left;font-weight:600}
.blog-body td{padding:9px 12px;border-bottom:1px solid var(--border)}
.blog-body tr:nth-child(even) td{background:var(--bg)}
.blog-cta{background:linear-gradient(135deg,#EFF6FF,#DBEAFE);border:1px solid #BFDBFE;border-radius:12px;padding:24px;text-align:center;margin:32px 0}
.blog-cta h3{font-size:1.1rem;font-weight:700;margin-bottom:6px}
.blog-cta p{color:var(--text-muted);font-size:.875rem;margin-bottom:14px}
.btn-cta{background:var(--success);color:var(--white);padding:12px 28px;border-radius:var(--radius);font-size:.95rem;font-weight:700;display:inline-block}
.btn-cta:hover{background:var(--success-dark);text-decoration:none}

/* ===== PAGE CONTENT (about/contact/privacy) ===== */
.page-content{max-width:720px;margin:40px auto;padding:0 16px 60px}
.page-content h1{font-size:1.8rem;font-weight:700;margin-bottom:8px}
.page-content h2{font-size:1.1rem;font-weight:700;margin:26px 0 8px}
.page-content p,.page-content li{color:#475569;line-height:1.75;margin-bottom:10px}
.page-content ul{padding-left:20px}
.highlight-box{background:#EFF6FF;border-left:4px solid var(--primary);padding:14px 18px;border-radius:0 8px 8px 0;margin:20px 0}
.highlight-box p{margin:0;font-weight:500;color:var(--text)}
.contact-form .form-group{margin-bottom:14px}
.contact-form label{display:block;font-size:.82rem;font-weight:500;color:#475569;margin-bottom:4px}
.contact-form input,.contact-form textarea,.contact-form select{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:6px;font-family:inherit;font-size:.9rem}
.contact-form textarea{min-height:110px;resize:vertical}
.btn-submit{background:var(--primary);color:var(--white);border:none;padding:11px 28px;border-radius:var(--radius);font-size:.9rem;font-weight:600;cursor:pointer;width:100%}
.btn-submit:hover{background:var(--primary-dark)}
.success-msg{display:none;background:#F0FDF4;border:1px solid #86EFAC;border-radius:var(--radius);padding:12px;color:var(--success);font-weight:500;text-align:center;margin-top:10px}

/* ===== ERROR PAGES ===== */
.error-page{text-align:center;padding:80px 16px;max-width:520px;margin:0 auto}
.error-code{font-size:7rem;font-weight:800;color:var(--border);line-height:1}
.error-page h1{font-size:1.6rem;font-weight:700;margin:12px 0 10px}
.error-page p{color:var(--text-muted);font-size:.95rem;margin-bottom:28px;line-height:1.7}
.error-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:24px}
.error-links{display:flex;gap:12px;align-items:center;justify-content:center;font-size:.85rem;flex-wrap:wrap}
.error-links span{color:var(--text-muted)}
@media(max-width:600px){
  .error-code{font-size:5rem}
  .error-page h1{font-size:1.3rem}
  .error-actions{flex-direction:column;align-items:center}
  .error-actions .btn{width:100%;max-width:280px;justify-content:center}
}

/* ===== FOOTER ===== */
footer{background:#1E293B;color:#94A3B8;padding:28px 0;margin-top:40px}
footer .inner{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:16px}
.footer-brand .site-logo{color:#60A5FA}
.footer-brand .site-logo span{color:var(--white)}
.footer-brand p{font-size:.8rem;margin-top:4px;color:#64748B}
.footer-links{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
footer a{color:#94A3B8;font-size:.84rem}
footer a:hover{color:var(--white)}
.footer-copy{width:100%;font-size:.78rem;border-top:1px solid #334155;padding-top:14px;margin-top:8px;color:#475569;text-align:center}

/* ===== SEO CONTENT SECTION ===== */
.seo-section{padding:40px 24px;border-top:1px solid var(--border);max-width:1200px}
.seo-section h2{font-size:1.25rem;font-weight:700;margin:28px 0 10px;color:var(--text)}
.seo-section h2:first-child{margin-top:0}
.seo-section p{color:#475569;line-height:1.8;margin-bottom:12px;font-size:.93rem}
.seo-section ul,.seo-section ol{padding-left:22px;margin-bottom:14px;color:#475569}
.seo-section li{margin-bottom:6px;line-height:1.75;font-size:.92rem}
@media(max-width:600px){
  .seo-section{padding:28px 16px}
  .seo-section h2{font-size:1.1rem}
  .seo-section p,.seo-section li{font-size:.88rem}
}

/* ===== MOBILE FAB ===== */
.mobile-fab{display:none;position:fixed;bottom:18px;right:18px;z-index:200;background:var(--success);color:var(--white);border:none;border-radius:50px;padding:13px 20px;font-size:.875rem;font-weight:700;box-shadow:0 4px 16px rgba(22,163,74,.4);gap:6px;align-items:center;cursor:pointer}

/* ===== HISTORY MODAL ===== */
.history-modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:300;align-items:center;justify-content:center;padding:20px}
.history-modal-content{background:var(--white);border-radius:12px;max-width:800px;width:100%;max-height:90vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.history-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--border)}
.history-header h2{font-size:1.3rem;font-weight:700;margin:0}
.history-close{background:none;border:none;font-size:1.5rem;color:var(--text-muted);cursor:pointer;padding:4px 8px;border-radius:4px;transition:background .15s}
.history-close:hover{background:var(--bg)}
.history-list{padding:20px;overflow-y:auto;flex:1}
.history-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:16px;margin-bottom:12px;transition:box-shadow .2s}
.history-card:hover{box-shadow:0 2px 8px rgba(0,0,0,.1)}
.history-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.history-card-header strong{font-size:1rem}
.status-badge{display:inline-block;padding:2px 8px;border-radius:4px;color:var(--white);font-size:.7rem;font-weight:600;margin-left:6px}
.history-card-body{margin-bottom:12px;font-size:.875rem;color:var(--text-muted);display:grid;grid-template-columns:1fr 1fr;gap:6px}
.history-card-actions{display:flex;gap:8px}
.btn-history-load,.btn-history-delete{padding:6px 14px;border-radius:6px;font-size:.8rem;font-weight:600;border:none;cursor:pointer;transition:all .15s}
.btn-history-load{background:var(--primary);color:var(--white)}
.btn-history-load:hover{background:var(--primary-dark)}
.btn-history-delete{background:var(--bg);color:#EF4444;border:1px solid var(--border)}
.btn-history-delete:hover{background:#FEF2F2}

/* ===== PRINT ===== */
@media print{
  #site-header,.hero,.form-panel,.action-bar,.how-section,.faq-section,.blog-section,footer,.ad-slot,#share-banner,.preview-label,.mobile-fab,#toast{display:none!important}
  .tool-grid{display:block!important}
  .preview-panel{position:static!important}
  #invoice-preview{box-shadow:none!important;border:none!important;padding:0!important}
  body{background:#fff}
}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .blog-grid{grid-template-columns:repeat(2,1fr)}
  .tool-grid{grid-template-columns:1fr;gap:16px}
  .preview-panel{position:static;margin-top:20px}
}
@media(max-width:900px){
  .tool-grid{grid-template-columns:1fr}
  .preview-panel{position:static}
  .steps-grid{grid-template-columns:1fr}
}
@media(max-width:600px){
  /* General */
  body{overflow-x:hidden}
  .container{padding:0 12px;width:100%;max-width:100%}

  /* Header */
  #site-header .inner{height:52px}
  .site-logo{font-size:1rem}
  nav a:not(.btn-nav){display:none}
  nav .btn-nav{display:none}

  /* Hero */
  .hero{padding:24px 0 16px}
  .hero h1{font-size:1.5rem;line-height:1.2}
  .hero p{font-size:.9rem}
  .trust-badges{gap:6px}
  .badge{font-size:.72rem;padding:4px 10px}

  /* Forms */
  .form-panel{padding:14px 12px;width:100%;box-sizing:border-box;min-width:0}
  fieldset{padding:12px 10px;margin-bottom:14px;width:100%;box-sizing:border-box;min-width:0}
  legend{font-size:.72rem}
  .form-row{grid-template-columns:1fr;gap:8px;width:100%}
  .form-row.full{grid-template-columns:1fr}
  .form-group{width:100%;min-width:0}
  input[type=text],input[type=email],input[type=date],input[type=number],input[type=tel],textarea,select{
    font-size:16px; /* prevent iOS zoom */
    padding:9px 10px;width:100%;max-width:100%;box-sizing:border-box}
  label{font-size:.75rem}
  .currency-row{flex-wrap:wrap;gap:8px}
  .currency-row select{max-width:100%;flex:1}

  /* Quick date buttons */
  .quick-btns{gap:4px}
  .quick-btn{font-size:.72rem;padding:3px 7px}

  /* Client DB */
  .client-db-row{flex-wrap:wrap}
  .client-db-row select{width:100%}

  /* Logo upload */
  .logo-upload-area{padding:10px;width:100%;box-sizing:border-box}

  /* Line items — scrollable on mobile */
  .items-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -12px;padding:0 12px;width:calc(100% + 24px)}
  .items-table{font-size:.78rem;min-width:340px}
  .items-table th,.items-table td{padding:6px 4px}
  .items-table input{padding:5px 6px;font-size:.78rem;width:100%;max-width:100%;box-sizing:border-box}
  .btn-add-item{font-size:.82rem;padding:8px 14px;width:100%;text-align:center}

  /* Totals */
  .totals-section{max-width:100%;margin-left:0;margin-top:12px;width:100%}
  .totals-row{font-size:.82rem;padding:5px 0}
  .totals-row input{width:60px;font-size:.82rem}

  /* Actions */
  .action-bar{flex-direction:column;gap:8px;margin-top:16px}
  .btn{width:100%;justify-content:center;padding:12px 16px;font-size:.9rem}

  /* Preview — horizontally scrollable to preserve invoice layout */
  .preview-panel{margin-top:20px;position:static;width:100%;box-sizing:border-box;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .preview-label{font-size:.72rem;margin-bottom:6px}
  #invoice-preview{padding:24px 20px;min-width:520px;box-sizing:border-box}

  /* Mobile FAB */
  .mobile-fab{display:flex!important}
  
  /* History Modal */
  .history-modal{padding:0}
  .history-modal-content{max-width:100%;max-height:100vh;border-radius:0}
  .history-header{padding:16px}
  .history-header h2{font-size:1.1rem}
  .history-list{padding:12px}
  .history-card{padding:14px}
  .history-card-body{grid-template-columns:1fr;gap:4px}
  .history-card-actions{flex-direction:column}
  .btn-history-load,.btn-history-delete{width:100%;padding:8px 14px}

  /* Sections */
  .how-section{padding:28px 16px}
  .faq-section{padding:28px 16px}
  .blog-section{padding:28px 16px}
  .how-section h2,.faq-section h2,.blog-section h2{font-size:1.25rem;margin-bottom:18px}
  .steps-grid{grid-template-columns:1fr;gap:14px}
  .step-card{padding:18px}
  .step-num{width:38px;height:38px;font-size:1rem}
  .step-card h3{font-size:.88rem}
  .step-card p{font-size:.8rem}

  /* FAQ */
  .faq-q{padding:12px 14px;font-size:.86rem}
  .faq-a{font-size:.82rem}

  /* Blog */
  .blog-grid{grid-template-columns:1fr;gap:12px}
  .blog-card{padding:16px}
  .blog-card h3{font-size:.85rem}
  .blog-card p{font-size:.78rem}

  /* Share banner */
  #share-banner{padding:12px}
  .share-btns{flex-direction:column;gap:8px}
  .share-btns .btn{width:100%;justify-content:center}

  /* Footer */
  footer{padding:20px 0}
  footer .inner{flex-direction:column;align-items:flex-start;gap:12px}
  .footer-links{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-copy{font-size:.72rem;text-align:left}

  /* Blog Pages */
  .blog-hero{padding:28px 0 20px}
  .blog-hero h1{font-size:1.45rem}
  .blog-hero .meta{font-size:.78rem}
  .blog-body{padding:24px 16px 48px}
  .blog-body h2{font-size:1.1rem;margin:20px 0 8px}
  .blog-body h3{font-size:.95rem;margin:16px 0 6px}
  .blog-body p,.blog-body li{font-size:.88rem}
  .blog-body table{font-size:.78rem;overflow-x:auto;display:block}
  .blog-cta{padding:20px;margin:24px 0}
  .blog-cta h3{font-size:1rem}
  .blog-cta p{font-size:.82rem}
  .btn-cta{font-size:.88rem;padding:11px 24px}

  /* Page Content */
  .page-content{padding:0 16px 48px}
  .page-content h1{font-size:1.5rem}
  .page-content h2{font-size:1rem;margin:20px 0 8px}
  .page-content p,.page-content li{font-size:.88rem}
  .highlight-box{padding:12px 16px}

  /* Contact Form */
  .contact-form input,.contact-form textarea,.contact-form select{font-size:.85rem;padding:8px 11px}
  .btn-submit{font-size:.85rem;padding:10px 24px}
}