/* ============================================================
   best.free — modern SaaS design system
   Built on Bootstrap 5; this sheet restyles + adds components.
   Brand blue #2563EB. KISS, generous whitespace, big tap targets.
   ============================================================ */

:root {
    --bf-blue:       #2563EB;
    --bf-blue-dark:  #1D4ED8;
    --bf-blue-700:   #1E40AF;
    --bf-blue-50:    #EFF4FF;
    --bf-blue-100:   #DCE7FE;
    --bf-ink:        #0F172A;
    --bf-body:       #475569;
    --bf-muted:      #64748B;
    --bf-border:     #E5E9F0;
    --bf-border-2:   #D9E0EC;
    --bf-bg:         #F7F9FC;
    --bf-white:      #FFFFFF;
    --bf-radius:     16px;
    --bf-radius-sm:  12px;
    --bf-radius-pill: 999px;
    --bf-shadow-sm:  0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.05);
    --bf-shadow:     0 4px 16px rgba(15,23,42,.07);
    --bf-shadow-lg:  0 18px 48px rgba(15,23,42,.14);
    --bf-shadow-blue:0 10px 30px rgba(37,99,235,.28);
    --bf-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

/* ---------- Base ---------- */
html { -webkit-text-size-adjust: 100%; }
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: var(--bf-font);
    color: var(--bf-body);
    background: var(--bf-white);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    letter-spacing: -0.005em;
}
main { flex: 1; }

h1, h2, h3, h4, h5, h6, .navbar-brand {
    color: var(--bf-ink);
    font-weight: 700;
    letter-spacing: -0.02em;
}
h1 { line-height: 1.12; }
a { color: var(--bf-blue); text-decoration: none; }
a:hover { color: var(--bf-blue-dark); }
.text-muted { color: var(--bf-muted) !important; }

/* ---------- Navbar ---------- */
.navbar.site-nav {
    background: rgba(255,255,255,.88) !important;
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--bf-border);
    padding-top: .6rem;
    padding-bottom: .6rem;
}
.navbar.site-nav .navbar-brand {
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--bf-ink);
    letter-spacing: -0.03em;
}
.navbar.site-nav .navbar-brand::before {
    content: "";
    display: inline-block;
    width: 11px; height: 11px;
    margin-right: .5rem;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--bf-blue), #60A5FA);
    vertical-align: middle;
}
.navbar.site-nav .nav-link {
    color: #334155;
    font-weight: 500;
    border-radius: 8px;
    padding: .4rem .8rem !important;
    transition: color .15s, background .15s;
}
.navbar.site-nav .nav-link:hover { color: var(--bf-blue); background: var(--bf-blue-50); }
.navbar.site-nav .nav-link.active { color: var(--bf-blue); font-weight: 600; }
.navbar.site-nav .navbar-toggler { border: 0; padding: .25rem .4rem; }
.navbar.site-nav .navbar-toggler:focus { box-shadow: none; }

/* ---------- Buttons ---------- */
.btn {
    font-weight: 600;
    border-radius: var(--bf-radius-sm);
    padding: .6rem 1.25rem;
    transition: transform .12s ease, box-shadow .2s ease, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn-lg { padding: .85rem 1.8rem; font-size: 1.05rem; border-radius: 14px; }
.btn-primary {
    background: var(--bf-blue);
    border-color: var(--bf-blue);
    box-shadow: 0 1px 2px rgba(37,99,235,.25);
}
.btn-primary:hover, .btn-primary:focus {
    background: var(--bf-blue-dark);
    border-color: var(--bf-blue-dark);
    box-shadow: var(--bf-shadow-blue);
}
.btn-outline-primary {
    color: var(--bf-blue);
    border-color: var(--bf-border-2);
    background: var(--bf-white);
}
.btn-outline-primary:hover {
    background: var(--bf-blue);
    border-color: var(--bf-blue);
    box-shadow: var(--bf-shadow-blue);
}
.btn-success { border-radius: var(--bf-radius-sm); }

/* ---------- Forms ---------- */
.form-control, .form-select {
    border-radius: var(--bf-radius-sm);
    border-color: var(--bf-border-2);
    padding: .65rem .9rem;
    color: var(--bf-ink);
}
.form-control-lg { padding: .9rem 1.1rem; border-radius: 14px; }
.form-control:focus, .form-select:focus {
    border-color: var(--bf-blue);
    box-shadow: 0 0 0 4px rgba(37,99,235,.14);
}
.form-label { font-weight: 600; color: var(--bf-ink); }

/* ---------- Hero ---------- */
.bf-hero {
    position: relative;
    background:
        radial-gradient(900px 380px at 50% -120px, rgba(37,99,235,.14), transparent 70%),
        linear-gradient(180deg, var(--bf-blue-50) 0%, #FBFCFE 70%, var(--bf-white) 100%);
    border-bottom: 1px solid var(--bf-border);
    padding: 4.5rem 0 4rem;
    text-align: center;
}
.bf-hero h1 {
    font-size: clamp(2.3rem, 5.2vw, 3.6rem);
    margin-bottom: 1rem;
    letter-spacing: -0.035em;
}
.bf-hero .lead {
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    color: var(--bf-body);
    max-width: 640px;
    margin: 0 auto 2rem;
}
.bf-hero .bf-search {
    max-width: 620px;
    margin: 0 auto;
    background: var(--bf-white);
    border-radius: var(--bf-radius-pill);
    box-shadow: var(--bf-shadow), 0 0 0 1px var(--bf-border);
    padding: .4rem .4rem .4rem 1.2rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.bf-hero .bf-search .form-control {
    border: 0;
    box-shadow: none !important;
    font-size: 1.05rem;
    padding-left: .25rem;
}
.bf-hero .bf-search .btn { border-radius: var(--bf-radius-pill); white-space: nowrap; }
.bf-trust {
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .5rem 1.4rem;
    color: var(--bf-muted);
    font-size: .92rem;
    font-weight: 500;
}
.bf-trust span { display: inline-flex; align-items: center; gap: .35rem; }
.bf-trust span::before {
    content: "✓";
    color: #16A34A;
    font-weight: 800;
}

/* ---------- Section rhythm ---------- */
.bf-section { padding: 3.5rem 0; }
.bf-section-tight { padding: 2.5rem 0; }
.section-head { margin-bottom: 1.75rem; }
.section-head h2 { font-size: 1.7rem; margin-bottom: .35rem; }
.section-head .sub { color: var(--bf-muted); margin: 0; }
.eyebrow {
    text-transform: uppercase;
    letter-spacing: .08em;
    font-size: .78rem;
    font-weight: 700;
    color: var(--bf-blue);
    margin-bottom: .5rem;
}

/* ---------- Cards ---------- */
.card {
    border: 1px solid var(--bf-border);
    border-radius: var(--bf-radius);
    box-shadow: none;
}
.card.shadow-sm { box-shadow: var(--bf-shadow-sm) !important; }

/* Tool card (homepage popular, hub, category, search) */
.tool-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bf-white);
    border: 1px solid var(--bf-border);
    border-radius: var(--bf-radius);
    padding: 1.15rem 1.25rem;
    transition: transform .16s ease, box-shadow .2s ease, border-color .2s ease;
}
a.tool-card, .tool-card a { text-decoration: none; }
.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--bf-blue-100);
    box-shadow: var(--bf-shadow);
}
.tool-card .tc-icon {
    width: 44px; height: 44px;
    flex: 0 0 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    line-height: 1;
    border-radius: 12px;
    background: var(--bf-blue-50);
    margin-bottom: .85rem;
}
.tool-card .tc-title {
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--bf-ink);
    margin: 0 0 .3rem;
}
.tool-card .tc-desc {
    font-size: .9rem;
    color: var(--bf-muted);
    margin: 0;
    line-height: 1.5;
}
.tool-card .tc-arrow {
    margin-top: auto;
    padding-top: .85rem;
    color: var(--bf-blue);
    font-weight: 600;
    font-size: .9rem;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity .2s, transform .2s;
}
.tool-card:hover .tc-arrow { opacity: 1; transform: translateX(0); }

/* Category card with tool links list */
.cat-card { height: 100%; }
.cat-card .cat-head { display: flex; align-items: center; gap: .7rem; margin-bottom: .35rem; }
.cat-card .tc-icon { margin-bottom: 0; }
.cat-card .cat-links { list-style: none; padding: 0; margin: .85rem 0 0; }
.cat-card .cat-links li { margin-bottom: .15rem; }
.cat-card .cat-links a {
    display: block;
    padding: .4rem .6rem;
    border-radius: 9px;
    color: #334155;
    font-weight: 500;
    font-size: .94rem;
}
.cat-card .cat-links a:hover { background: var(--bf-blue-50); color: var(--bf-blue); }

/* ---------- Tool widget (the big one) ---------- */
.tool-stage {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}
.tool-header { text-align: center; max-width: 720px; margin: 0 auto 2rem; }
.tool-header h1 { font-size: clamp(2rem, 4.5vw, 2.9rem); margin-bottom: .65rem; }
.tool-header .lead { color: var(--bf-body); font-size: 1.15rem; margin: 0; }

.tool-widget {
    background: var(--bf-white);
    border: 1px solid var(--bf-border);
    border-radius: 20px;
    box-shadow: var(--bf-shadow);
    padding: 1.75rem;
}
@media (min-width: 576px) { .tool-widget { padding: 2.25rem; } }

/* Big primary submit inside any widget = full width, centered, prominent */
.tool-widget form > button[type="submit"],
.tool-widget form .widget-actions button[type="submit"] {
    display: block;
    width: 100%;
    font-size: 1.1rem;
    padding: .95rem 1.5rem;
    border-radius: 14px;
    margin-top: .25rem;
}
.tool-widget .form-text { color: var(--bf-muted); }
.tool-widget form > .text-muted.small { text-align: center; }

/* ---------- Dropzone (injected by tools.js) ---------- */
.bf-dropzone {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: .25rem;
    padding: 2.5rem 1.25rem;
    border: 2px dashed var(--bf-border-2);
    border-radius: 16px;
    background: var(--bf-bg);
    cursor: pointer;
    transition: border-color .15s, background .15s, transform .1s;
    margin-bottom: 1.25rem;
}
.bf-dropzone:hover { border-color: var(--bf-blue); background: var(--bf-blue-50); }
.bf-dropzone.is-dragover {
    border-color: var(--bf-blue);
    background: var(--bf-blue-50);
    box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}
.bf-dropzone.has-file { border-style: solid; border-color: var(--bf-blue-100); background: var(--bf-white); }
.bf-dropzone .dz-icon {
    width: 56px; height: 56px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 16px;
    background: var(--bf-blue-50);
    color: var(--bf-blue);
    margin-bottom: .6rem;
}
.bf-dropzone .dz-icon svg { width: 28px; height: 28px; }
.bf-dropzone .dz-title { font-weight: 700; color: var(--bf-ink); font-size: 1.08rem; }
.bf-dropzone .dz-title .dz-browse { color: var(--bf-blue); text-decoration: underline; }
.bf-dropzone .dz-hint { color: var(--bf-muted); font-size: .9rem; margin-top: .1rem; }
.bf-dropzone .dz-files { width: 100%; margin-top: .25rem; }
.bf-dropzone .dz-file {
    display: inline-flex; align-items: center; gap: .55rem;
    background: var(--bf-blue-50);
    border: 1px solid var(--bf-blue-100);
    border-radius: 10px;
    padding: .5rem .85rem;
    margin: .25rem;
    font-size: .92rem;
    color: var(--bf-ink);
    max-width: 100%;
}
.bf-dropzone .dz-file .dz-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 260px; }
.bf-dropzone .dz-file .dz-size { color: var(--bf-muted); }
.bf-dropzone .dz-clear {
    margin-top: .5rem;
    background: none; border: 0;
    color: var(--bf-muted);
    font-size: .85rem;
    text-decoration: underline;
    cursor: pointer;
}
.bf-dropzone .dz-clear:hover { color: var(--bf-blue); }

/* Spinner state on submit */
.btn .bf-spinner {
    display: inline-block;
    width: 1.05em; height: 1.05em;
    border: 2px solid rgba(255,255,255,.5);
    border-top-color: #fff;
    border-radius: 50%;
    margin-right: .5rem;
    vertical-align: -.15em;
    animation: bf-spin .7s linear infinite;
}
@keyframes bf-spin { to { transform: rotate(360deg); } }

/* ---------- How it works ---------- */
.steps { counter-reset: step; }
.step-card { text-align: center; padding: 1.5rem 1rem; }
.step-num {
    width: 52px; height: 52px;
    margin: 0 auto 1rem;
    display: flex; align-items: center; justify-content: center;
    border-radius: 16px;
    background: var(--bf-blue);
    color: #fff;
    font-weight: 800;
    font-size: 1.3rem;
    box-shadow: var(--bf-shadow-blue);
}
.step-card h3 { font-size: 1.15rem; margin-bottom: .4rem; }
.step-card p { color: var(--bf-muted); margin: 0; }

/* ---------- FAQ accordion ---------- */
.accordion { --bs-accordion-border-color: var(--bf-border); border-radius: var(--bf-radius); overflow: hidden; }
.accordion-item { border-color: var(--bf-border); }
.accordion-button {
    font-weight: 600;
    color: var(--bf-ink);
    padding: 1.05rem 1.25rem;
}
.accordion-button:not(.collapsed) { color: var(--bf-blue); background: var(--bf-blue-50); box-shadow: none; }
.accordion-button:focus { box-shadow: 0 0 0 3px rgba(37,99,235,.18); border-color: var(--bf-blue); }
.accordion-body { color: var(--bf-body); }

/* ---------- Developer / API teaser ---------- */
.api-teaser {
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    border-radius: 22px;
    color: #E2E8F0;
    padding: 2.5rem;
}
.api-teaser h2 { color: #fff; }
.api-teaser .eyebrow { color: #93C5FD; }
.api-teaser pre {
    background: rgba(2,6,23,.6);
    border: 1px solid rgba(148,163,184,.18);
    border-radius: 14px;
    padding: 1.1rem 1.2rem;
    margin: 0;
    overflow-x: auto;
}
.api-teaser pre code { color: #BAE6FD; font-size: .9rem; }
.api-teaser .btn-light { background: #fff; color: var(--bf-ink); font-weight: 700; border: 0; }

/* ---------- API docs section on tool pages ---------- */
.nav-tabs .nav-link { color: var(--bf-muted); font-weight: 600; border-radius: 10px 10px 0 0; }
.nav-tabs .nav-link.active { color: var(--bf-blue); }
pre { border-radius: var(--bf-radius-sm); }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: .9rem; }
.breadcrumb-item a { color: var(--bf-muted); }
.breadcrumb-item.active { color: var(--bf-ink); }

/* ---------- Sidebar cards on tool page ---------- */
.side-card { border: 1px solid var(--bf-border); border-radius: var(--bf-radius); }
.side-card .side-title { font-size: .76rem; text-transform: uppercase; letter-spacing: .07em; color: var(--bf-muted); font-weight: 700; }
.side-card a.side-link {
    display: block; padding: .5rem .65rem; border-radius: 9px;
    color: #334155; font-weight: 500;
}
.side-card a.side-link:hover { background: var(--bf-blue-50); color: var(--bf-blue); }

/* ---------- Author hero ---------- */
.author-hero { display: flex; align-items: center; gap: 1.1rem; margin-bottom: 1.5rem; }
.author-hero .avatar {
    width: 88px; height: 88px; flex: 0 0 88px;
    border-radius: 50%;
    background: var(--bf-blue);
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--bf-shadow);
}

/* ---------- Footer ---------- */
footer.site-footer {
    background: var(--bf-bg);
    border-top: 1px solid var(--bf-border);
    margin-top: 3rem;
}
footer.site-footer a { color: var(--bf-muted); font-weight: 500; }
footer.site-footer a:hover { color: var(--bf-blue); }
footer.site-footer .brand { font-weight: 800; color: var(--bf-ink); }

/* ---------- Pricing (kept) ---------- */
.pricing-card { border-radius: var(--bf-radius); transition: transform 0.2s; }
.pricing-card:hover { transform: translateY(-5px); }
.pricing-card.featured { border: 2px solid var(--bf-blue); }
#card-element { border: 1px solid var(--bf-border-2); padding: 0.75rem; border-radius: var(--bf-radius-sm); }
.spinner-border-sm { width: 1rem; height: 1rem; }

/* ---------- Utility ---------- */
.hidden { display: none !important; }
.alert ul { margin: 0; padding-left: 1rem; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
    .navbar.site-nav .navbar-nav { padding: .5rem 0; }
}
@media (max-width: 768px) {
    .display-4 { font-size: 2rem; }
    .bf-hero { padding: 3rem 0 2.75rem; }
    .bf-hero .bf-search { flex-direction: column; padding: .9rem; border-radius: 18px; gap: .6rem; }
    .bf-hero .bf-search .form-control { width: 100%; text-align: center; }
    .bf-hero .bf-search .btn { width: 100%; }
    .bf-section { padding: 2.5rem 0; }
    .api-teaser { padding: 1.75rem; }
}