/* ═══════════════════════════════════════════════════════
   FLOWGRAPH · Landing
   Warm editorial theme — merged best-of
   ═══════════════════════════════════════════════════════ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg:        #F2F2F0;
    --bg-alt:    #FAFAF8;
    --text:      #1F1F1F;
    --text-2:    #5A5A5A;
    --text-3:    #888888;
    --border:    #DCDCDA;
    --border-2:  #CBCBC9;
    --green:     #1BA36C;
    --accent:    #6072A5;
    --purple:    #8055D0;
    --container: 1060px;
    --r-sm:      8px;
    --r-md:      12px;
    --r-lg:      16px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

img { max-width: 100%; display: block; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 40px;
}


/* ─────────────────────────────────────── NAV */

.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(245, 240, 230, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 40px;
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-logo-text {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links a {
    font-size: 13px;
    color: var(--text-2);
    font-weight: 450;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-dl {
    background: var(--purple) !important;
    color: #fff !important;
    padding: 6px 14px !important;
    border-radius: 7px !important;
    font-weight: 600 !important;
    transition: opacity 0.2s !important;
}

.nav-dl:hover { opacity: 0.75; }


/* ─────────────────────────────────────── HERO */

.hero {
    padding: 128px 0 88px;
    background: var(--bg);
}

.hero-eyebrow {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: 26px;
}

.hero-title {
    font-size: clamp(40px, 5.5vw, 66px);
    font-weight: 670;
    letter-spacing: -2.5px;
    line-height: 1.04;
    color: var(--text);
    margin-bottom: 22px;
    max-width: 640px;
}

.hero-sub {
    font-size: 16px;
    color: var(--text-2);
    line-height: 1.7;
    max-width: 430px;
    margin-bottom: 36px;
}

.hero-btns {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.btn-dark {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--purple);
    color: #fff;
    padding: 11px 20px;
    border-radius: 9px;
    font-size: 14px;
    font-weight: 600;
    transition: opacity 0.2s, transform 0.18s;
}

.btn-dark:hover {
    opacity: 0.75;
    transform: translateY(-1px);
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-2);
    padding: 11px 18px;
    border-radius: 9px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--border-2);
    background: var(--bg-alt);
    transition: border-color 0.2s, color 0.2s;
}

.btn-ghost:hover {
    border-color: var(--text-2);
    color: var(--text);
}

.hero-note {
    font-size: 12px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.note-dot {
    width: 3px;
    height: 3px;
    background: var(--border-2);
    border-radius: 50%;
    flex-shrink: 0;
}


/* ─────────────────────────────────────── SECTIONS */

.section { padding: 88px 0; }
.section-alt  { background: var(--bg-alt); }
.section-warm { background: var(--bg); }

.eyebrow {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: 12px;
}

.sec-title {
    font-size: clamp(26px, 3.2vw, 38px);
    font-weight: 670;
    letter-spacing: -1.2px;
    color: var(--text);
    line-height: 1.1;
    margin-bottom: 14px;
}

.sec-body {
    font-size: 15px;
    color: var(--text-2);
    line-height: 1.75;
    max-width: 440px;
}


/* ─────────────────────────────────────── THREE PANELS (interface) */

.panels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.panel-card {
    background: var(--bg-alt);
    padding: 28px 26px 32px;
}

.panel-num {
    font-size: 13px;
    color: var(--text-3);
    margin-bottom: 14px;
}

.panel-card h3 {
    font-size: 15px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 8px;
    letter-spacing: -0.2px;
}

.panel-card p {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.65;
}


/* ─────────────────────────────────────── HOW IT WORKS */

.how-grid {
    display: grid;
    grid-template-columns: 1fr 1.7fr;
    gap: 80px;
    align-items: start;
}

.how-header { padding-top: 4px; }

.how-steps {
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    background: var(--bg-alt);
}

.how-step {
    display: flex;
    gap: 18px;
    padding: 24px 26px;
    border-bottom: 1px solid var(--border);
}

.how-step:last-child { border-bottom: none; }

.how-num {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-3);
    letter-spacing: 0.5px;
    padding-top: 2px;
    flex-shrink: 0;
    width: 18px;
}

.how-step h3 {
    font-size: 14px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 5px;
    letter-spacing: -0.2px;
}

.how-step p {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}


/* ─────────────────────────────────────── FEATURES */

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.feat {
    background: var(--bg-alt);
    padding: 24px 26px;
}

.feat h3 {
    font-size: 14px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 5px;
    letter-spacing: -0.2px;
}

.feat p {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}


/* ─────────────────────────────────────── COMPARE */

.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.compare-side {
    background: var(--bg-alt);
    padding: 28px 28px 32px;
}

.compare-tag {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-3);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 8px;
    margin-bottom: 16px;
}

.compare-tag-good {
    color: var(--green);
    background: rgba(27, 163, 108, 0.06);
    border-color: rgba(27, 163, 108, 0.2);
}

.compare-side h3 {
    font-size: 15px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}

.compare-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.compare-list li {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.55;
    padding-left: 18px;
    position: relative;
}

.compare-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-3);
    font-size: 12px;
}

.compare-list-good li::before {
    content: '✓';
    color: var(--green);
    font-size: 11px;
}


/* ─────────────────────────────────────── AGENTS */

.agents-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.agent-item {
    background: var(--bg-alt);
    padding: 26px 26px 28px;
}

.agent-type {
    font-size: 10px;
    font-weight: 700;
    color: var(--purple);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 7px;
}

.agent-item h3 {
    font-size: 15px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.agent-item p {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}

.presets-row {
    margin-top: 20px;
    padding: 20px 24px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.presets-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-3);
    letter-spacing: 1.2px;
    text-transform: uppercase;
    white-space: nowrap;
    flex-shrink: 0;
}

.preset-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.preset-tag {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-2);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 4px 10px;
}


/* ─────────────────────────────────────── QUICK START */

.qs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.qs-step {
    background: var(--bg-alt);
    padding: 26px 22px 28px;
}

.qs-num {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-3);
    letter-spacing: 0.5px;
    margin-bottom: 14px;
}

.qs-step h3 {
    font-size: 14px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 6px;
    letter-spacing: -0.2px;
}

.qs-step p {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}

.qs-note {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-3);
    line-height: 1.55;
}

.qs-step code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 12px;
    background: var(--bg);
    padding: 1px 5px;
    border-radius: 4px;
    border: 1px solid var(--border);
}


/* ─────────────────────────────────────── CONCEPTS */

.concepts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 40px;
}

.concept {
    background: var(--bg-alt);
    padding: 22px 24px;
}

.concept-term {
    font-size: 13px;
    font-weight: 650;
    color: var(--text);
    margin-bottom: 5px;
    letter-spacing: -0.2px;
}

.concept-def {
    font-size: 12px;
    color: var(--text-2);
    line-height: 1.6;
}


/* ─────────────────────────────────────── DOWNLOAD */

.download-section {
    background: var(--text);
    padding: 96px 0;
}

.download-section .eyebrow { color: rgba(255, 255, 255, 0.3); }
.download-section .sec-title { color: #fff; }
.download-section .sec-body { color: rgba(255, 255, 255, 0.45); }

.btn-white {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    color: var(--text);
    padding: 12px 22px;
    border-radius: 9px;
    font-size: 14px;
    font-weight: 700;
    transition: opacity 0.2s, transform 0.18s;
    margin-top: 36px;
}

.btn-white:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

.dl-meta {
    margin-top: 14px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.25);
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.dl-meta a { color: rgba(255, 255, 255, 0.38); transition: color 0.2s; }
.dl-meta a:hover { color: rgba(255, 255, 255, 0.65); }

.dl-privacy {
    margin-top: 22px;
    max-width: 520px;
    padding: 16px 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--r-md);
    background: rgba(255, 255, 255, 0.04);
}

.dl-privacy p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.38);
    line-height: 1.7;
}

.dl-legal {
    margin-top: 10px;
    font-size: 12px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.dl-legal a { color: rgba(255, 255, 255, 0.28); transition: color 0.2s; }
.dl-legal a:hover { color: rgba(255, 255, 255, 0.6); }


/* ─────────────────────────────────────── FOOTER */

.footer {
    background: var(--text);
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-logo {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.3);
}

.footer-legal {
    display: flex;
    gap: 18px;
}

.footer-legal a {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.28);
    transition: color 0.2s;
}

.footer-legal a:hover { color: rgba(255, 255, 255, 0.6); }

.footer-copy {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.18);
}


/* ─────────────────────────────────────── PROVIDERS */

.providers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    margin-top: 52px;
}

.provider-card {
    background: var(--bg-alt);
    padding: 22px 24px 26px;
}

.provider-card-any {
    grid-column: 1 / -1;
    background: var(--bg);
}

.provider-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.provider-name {
    font-size: 14px;
    font-weight: 650;
    color: var(--text);
    letter-spacing: -0.2px;
}

.provider-badge {
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 2px 7px;
    border-radius: 4px;
}

.provider-badge-local {
    color: var(--green);
    background: rgba(27, 163, 108, 0.08);
    border: 1px solid rgba(27, 163, 108, 0.2);
}

.provider-badge-cloud {
    color: var(--accent);
    background: rgba(96, 114, 165, 0.08);
    border: 1px solid rgba(96, 114, 165, 0.2);
}

.provider-badge-fast {
    color: var(--purple);
    background: rgba(128, 85, 208, 0.08);
    border: 1px solid rgba(128, 85, 208, 0.2);
}

.provider-badge-custom {
    color: var(--text-3);
    background: var(--bg);
    border: 1px solid var(--border);
}

.provider-desc {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.6;
}


/* ─────────────────────────────────────── RESPONSIVE */

@media (max-width: 900px) {
    .panels-grid     { grid-template-columns: 1fr; }
    .how-grid        { grid-template-columns: 1fr; gap: 36px; }
    .features-grid   { grid-template-columns: 1fr; }
    .compare-grid    { grid-template-columns: 1fr; }
    .agents-grid     { grid-template-columns: 1fr 1fr; }
    .qs-grid         { grid-template-columns: 1fr 1fr; }
    .concepts-grid   { grid-template-columns: 1fr 1fr; }
    .providers-grid  { grid-template-columns: 1fr 1fr; }
    .provider-card-any { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
    .container       { padding: 0 20px; }
    .nav-container   { padding: 0 20px; }
    .hero-title      { font-size: 36px; letter-spacing: -1.5px; }
    .nav-links       { display: none; }
    .agents-grid     { grid-template-columns: 1fr; }
    .qs-grid         { grid-template-columns: 1fr; }
    .concepts-grid   { grid-template-columns: 1fr; }
    .providers-grid  { grid-template-columns: 1fr; }
    .footer-content  { flex-direction: column; align-items: flex-start; gap: 10px; }
    .presets-row     { flex-direction: column; align-items: flex-start; gap: 12px; }
}