/* ============================================
   Flashing Light: Morse Trainer — "Chartroom Instrument" theme
   A dark, low-glare maritime console where a single warm
   signal lamp is the only thing that glows.
   Color roles:
   - Canvas/surfaces: near-black blue-steel charcoal, layered by elevation
   - Lamp/accent: one warm amber (the signal lamp), used sparingly
   - Text: warm-neutral off-white on dark (never pure white, low glare)
   Brand class prefix: fl-
   ============================================ */

:root {
    /* ---- Canvas / surfaces (near-black, layered by elevation) ---- */
    --fl-bg: #0A0E14;          /* page background — the darkened chartroom */
    --fl-surface: #0F1620;     /* raised / alternating section band */
    --fl-surface-2: #18232F;   /* cards, callouts, screenshot placeholders */
    --fl-surface-3: #212B39;   /* hovered card / raised callout */

    /* ---- Borders / hairlines (instrument-panel seams) ---- */
    --fl-border: #243140;      /* default 1px hairline */
    --fl-border-strong: #3A4658; /* hover / focus border */

    /* ---- Lamp / accent (the single warm signal lamp) ---- */
    --fl-amber: #FFB23E;       /* primary lamp accent */
    --fl-amber-bright: #FFC766;/* lamp "lit" highlight / hover / glow core */
    --fl-amber-deep: #C77E1A;  /* pressed/active + amber on light chips */
    --fl-glow: rgba(255, 178, 62, 0.28); /* glow halo for lamp + primary button */
    --fl-amber-soft: rgba(255, 178, 62, 0.12); /* translucent wash for pills/icon chips */

    /* ---- Signal green (a "free / included" tick only) ---- */
    --fl-signal-green: #4ADE80;

    /* ---- Text (warm-neutral on dark — accessibility-checked) ---- */
    --fl-text: #EAF0F6;        /* primary body/heading (~15:1 on --fl-bg, AAA) */
    --fl-muted: #93A1B0;       /* secondary/lead/footer text (~6.3:1, AA) */
    --fl-dim: #5C748A;         /* dimmest — mono eyebrow ticks, captions */

    /* ---- Type system (system stack — no web-font dependency) ---- */
    --fl-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --fl-font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

    /* ---- Shape ---- */
    --fl-radius: 0.75rem;
    --fl-radius-sm: 0.5rem;
    --fl-radius-lg: 1.25rem;
    --fl-shadow: 0 0.75rem 2rem rgba(0, 0, 0, 0.45);
}

html {
    font-size: 14px;
    position: relative;
    min-height: 100%;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    margin-bottom: 0;
    background-color: var(--fl-bg);
    color: var(--fl-text);
    font-family: var(--fl-font-sans);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--fl-amber);
    text-decoration: none;
}

a:hover {
    color: var(--fl-amber-bright);
    text-decoration: underline;
}

/* ============================================
   Mono "instrument marking" accents
   ============================================ */
.fl-eyebrow {
    display: inline-block;
    font-family: var(--fl-font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--fl-amber);
    margin-bottom: 0.75rem;
}

.fl-readout {
    font-family: var(--fl-font-mono);
    font-variant-numeric: tabular-nums;
    color: var(--fl-text);
}

.fl-trustline {
    font-family: var(--fl-font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--fl-muted);
}

/* ============================================
   Morse dot/dash rule — the signature divider
   Built from spans (.fl-dot / .fl-dash); a decodable signal.
   ============================================ */
.fl-morse-rule {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 1.5rem auto;
    opacity: 0.85;
}

.fl-morse-rule .fl-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--fl-amber);
}

.fl-morse-rule .fl-dash {
    width: 18px;
    height: 6px;
    border-radius: 3px;
    background: var(--fl-amber);
}

.fl-morse-rule .fl-gap {
    width: 12px;
}

/* ============================================
   Navbar
   ============================================ */
.fl-navbar {
    background: var(--fl-surface);
    border-bottom: 1px solid var(--fl-border);
    padding: 0.75rem 0;
}

.fl-navbar .navbar-brand {
    color: var(--fl-text) !important;
    font-size: 1.25rem;
}

.fl-navbar .nav-link {
    color: var(--fl-muted) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.2s ease;
}

.fl-navbar .nav-link:hover,
.fl-navbar .nav-link.active {
    color: var(--fl-text) !important;
}

.fl-navbar .navbar-toggler {
    border-color: var(--fl-border);
}

/* ---- Logo badge (a small lit lamp / dot-dash mark) ---- */
.fl-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: radial-gradient(circle at 50% 38%, var(--fl-amber-bright) 0%, var(--fl-amber) 62%, var(--fl-amber-deep) 100%);
    color: var(--fl-bg);
    border-radius: 8px;
    font-family: var(--fl-font-mono);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 1px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 0 14px 1px var(--fl-glow);
}

.fl-logo-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: radial-gradient(circle at 50% 38%, var(--fl-amber-bright) 0%, var(--fl-amber) 62%, var(--fl-amber-deep) 100%);
    color: var(--fl-bg);
    border-radius: 6px;
    font-family: var(--fl-font-mono);
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 1px;
}

/* ============================================
   Hero — the darkened lamp, lit once
   ============================================ */
.fl-hero {
    background:
        radial-gradient(circle at 50% 22%, var(--fl-glow) 0%, rgba(255, 178, 62, 0) 42%),
        var(--fl-bg);
    padding: 7rem 0;
    color: var(--fl-text);
    text-align: center;
}

.fl-hero h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.fl-hero .lead {
    font-size: 1.25rem;
    color: var(--fl-muted);
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}

/* ---- The hero signal-lamp beacon ---- */
.fl-lamp {
    width: 120px;
    height: 120px;
    margin: 0 auto 1.75rem;
    border-radius: 50%;
    background: radial-gradient(circle at 50% 42%, var(--fl-amber-bright) 0%, var(--fl-amber) 55%, var(--fl-amber-deep) 100%);
    border: 2px solid var(--fl-border-strong);
    box-shadow:
        0 0 0 8px var(--fl-glow),
        0 0 60px 8px rgba(255, 178, 62, 0.35);
    animation: fl-lamp-pulse 2.4s ease-in-out infinite;
}

@keyframes fl-lamp-pulse {
    0%, 100% {
        box-shadow: 0 0 0 6px var(--fl-glow), 0 0 44px 6px rgba(255, 178, 62, 0.28);
    }
    50% {
        box-shadow: 0 0 0 10px var(--fl-glow), 0 0 70px 12px rgba(255, 178, 62, 0.42);
    }
}

/* Respect photosensitivity / reduced-motion — freeze the lamp steady-lit */
@media (prefers-reduced-motion: reduce) {
    .fl-lamp {
        animation: none;
    }
}

/* ============================================
   Feature sections — continuous dark field,
   elevation (not color) carries the rhythm.
   ============================================ */
.fl-section {
    background: var(--fl-bg);
    padding: 6rem 0;
    color: var(--fl-text);
}

.fl-section-alt {
    background: var(--fl-surface);
    padding: 6rem 0;
    color: var(--fl-text);
    border-top: 1px solid var(--fl-border);
    border-bottom: 1px solid var(--fl-border);
}

.fl-section-title,
.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--fl-text);
    margin-bottom: 1.25rem;
}

.fl-section .lead,
.fl-section-alt .lead,
.fl-section-intro {
    color: var(--fl-muted);
}

/* ============================================
   Cards (feature / benefit) — flat instrument panels
   ============================================ */
.fl-card,
.feature-card,
.benefit-card {
    background: var(--fl-surface-2);
    border: 1px solid var(--fl-border);
    border-radius: var(--fl-radius);
    padding: 2rem;
    color: var(--fl-text);
    height: 100%;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.fl-card:hover,
.feature-card:hover,
.benefit-card:hover {
    transform: translateY(-4px);
    border-color: var(--fl-amber);
    box-shadow: 0 0.5rem 1.75rem var(--fl-glow);
}

.fl-card h5,
.feature-card h5,
.benefit-card h5,
.fl-card h4,
.feature-card h4 {
    color: var(--fl-text);
}

.fl-card p,
.feature-card p,
.benefit-card p {
    color: var(--fl-muted);
}

/* Card icons — single amber accent across all icons (lamp discipline) */
.fl-icon,
.feature-icon,
.benefit-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2.25rem;
    color: var(--fl-amber);
    margin-bottom: 1rem;
}

/* Optional rounded icon chip variant */
.fl-icon-chip {
    width: 52px;
    height: 52px;
    border-radius: var(--fl-radius-sm);
    background: var(--fl-amber-soft);
    color: var(--fl-amber);
    font-size: 1.6rem;
    margin-bottom: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   Gated / free pills — honest feature marking
   ============================================ */
.fl-pill-gated,
.fl-pill-free {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--fl-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    line-height: 1;
}

.fl-pill-gated {
    color: var(--fl-amber);
    background: var(--fl-amber-soft);
    border: 1px solid var(--fl-amber);
}

.fl-pill-free {
    color: var(--fl-muted);
    background: transparent;
    border: 1px solid var(--fl-border-strong);
}

/* ============================================
   Screenshot placeholders — empty instrument bezel
   ============================================ */
.screenshot-placeholder,
.fl-shot {
    background: var(--fl-surface-2);
    border: 2px dashed var(--fl-border-strong);
    border-radius: var(--fl-radius);
    padding: 3rem 2rem;
    text-align: center;
    min-height: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--fl-dim);
}

.screenshot-placeholder i,
.fl-shot i {
    color: var(--fl-dim);
}

.screenshot-placeholder p,
.fl-shot p,
.fl-shot-caption {
    font-family: var(--fl-font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--fl-dim);
    margin-top: 1rem;
    margin-bottom: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn-download {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: var(--fl-radius);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

/* Primary amber button — the "lit lamp" */
.btn-primary,
.fl-btn-primary {
    color: var(--fl-bg);
    background-color: var(--fl-amber);
    border-color: var(--fl-amber);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
.fl-btn-primary:hover,
.fl-btn-primary:focus {
    color: var(--fl-bg);
    background-color: var(--fl-amber-bright);
    border-color: var(--fl-amber-bright);
    box-shadow: 0 0.5rem 1.5rem var(--fl-glow);
    transform: translateY(-3px);
}

/* Outline (ghost) button — secondary on dark */
.btn-outline-lamp,
.fl-btn-outline {
    color: var(--fl-amber);
    background: transparent;
    border: 1px solid var(--fl-amber);
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: var(--fl-radius);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn-outline-lamp:hover,
.fl-btn-outline:hover {
    color: var(--fl-bg);
    background-color: var(--fl-amber);
    transform: translateY(-3px);
    box-shadow: 0 0.5rem 1.5rem var(--fl-glow);
}

/* "Coming soon" App Store button — HONEST placeholder, not a dead link.
   Two-line stack; not a navigation link. */
.btn-appstore-soon {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.6rem 1.4rem;
    background: var(--fl-surface-2);
    border: 1px solid var(--fl-amber);
    border-radius: var(--fl-radius);
    color: var(--fl-text);
    text-align: left;
    cursor: default;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.btn-appstore-soon:hover {
    box-shadow: 0 0.5rem 1.5rem var(--fl-glow);
    transform: translateY(-3px);
}

.btn-appstore-soon .bi {
    font-size: 1.85rem;
    color: var(--fl-amber);
}

.btn-appstore-soon .fl-appstore-stack {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.btn-appstore-soon .fl-appstore-top {
    font-family: var(--fl-font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--fl-dim);
}

.btn-appstore-soon .fl-appstore-bottom {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--fl-text);
}

/* ============================================
   CTA band
   ============================================ */
.cta-section,
.fl-cta {
    background:
        radial-gradient(circle at 50% 0%, var(--fl-glow) 0%, rgba(255, 178, 62, 0) 45%),
        var(--fl-surface);
    border-top: 1px solid var(--fl-border);
    padding: 5rem 0;
    color: var(--fl-text);
    text-align: center;
}

.cta-section .lead,
.fl-cta .lead {
    color: var(--fl-muted);
}

/* ============================================
   Content pages (Privacy / Support / Terms)
   Dark instrument surface — text kept highly legible.
   ============================================ */
.content-page {
    background: var(--fl-bg);
    padding: 3.5rem 0;
    color: var(--fl-text);
}

.content-page h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--fl-text);
    margin-bottom: 1.5rem;
}

.content-page h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2.25rem;
    margin-bottom: 1rem;
    color: var(--fl-amber);
}

.content-page h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.65rem;
    color: var(--fl-text);
}

.content-page p,
.content-page li {
    color: var(--fl-muted);
    line-height: 1.75;
}

.content-page ul,
.content-page ol {
    margin-bottom: 1.25rem;
    padding-left: 1.4rem;
}

.content-page li {
    margin-bottom: 0.4rem;
}

.content-page li::marker {
    color: var(--fl-amber-deep);
}

.content-page strong {
    color: var(--fl-text);
}

.content-page a {
    color: var(--fl-amber);
}

.content-page .lead {
    color: var(--fl-muted);
    font-size: 1.25rem;
}

.content-page .text-muted {
    color: var(--fl-dim) !important;
}

/* Cards inside content pages (e.g. Support contact/FAQ) */
.content-page .card {
    background: var(--fl-surface-2);
    border: 1px solid var(--fl-border);
    border-radius: var(--fl-radius);
    color: var(--fl-text);
}

.content-page .card .text-muted,
.content-page .card p {
    color: var(--fl-muted) !important;
}

.content-page .card h4,
.content-page .card h5,
.content-page .card h6 {
    color: var(--fl-text);
}

/* ============================================
   Info callout
   ============================================ */
.info-callout,
.fl-info-callout {
    background: var(--fl-surface-2);
    border: 1px solid var(--fl-border);
    border-left: 4px solid var(--fl-amber);
    border-radius: var(--fl-radius-sm);
    padding: 1.5rem 2rem;
    margin: 1.75rem 0;
    color: var(--fl-text);
}

.info-callout p,
.fl-info-callout p {
    color: var(--fl-muted);
}

.info-callout a,
.fl-info-callout a {
    color: var(--fl-amber);
}

/* ============================================
   Footer
   ============================================ */
.fl-footer {
    background-color: var(--fl-bg);
    border-top: 1px solid var(--fl-border);
    color: var(--fl-text);
    padding: 3rem 0 1.5rem;
    margin-top: 0;
}

.fl-footer .fl-footer-tagline {
    color: var(--fl-muted);
}

.fl-footer a {
    color: var(--fl-muted);
    transition: color 0.2s ease;
}

.fl-footer a:hover {
    color: var(--fl-amber) !important;
    text-decoration: none;
}

.fl-footer hr {
    border-color: var(--fl-border);
}

.fl-footer .fl-copyright {
    font-family: var(--fl-font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--fl-dim);
}

/* ============================================
   Focus states (visible amber ring on dark)
   ============================================ */
.btn:focus,
.btn:active:focus,
.btn-link.nav-link:focus,
.form-control:focus,
.form-check-input:focus,
a:focus-visible,
.btn-appstore-soon:focus-visible {
    outline: none;
    box-shadow: 0 0 0 0.15rem var(--fl-bg), 0 0 0 0.3rem var(--fl-amber);
}

/* ============================================
   Bootstrap utility overrides (amber accent)
   ============================================ */
.text-primary {
    color: var(--fl-amber) !important;
}

.bg-primary {
    background-color: var(--fl-amber) !important;
}

.text-muted {
    color: var(--fl-muted) !important;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .fl-hero {
        padding: 4rem 0;
    }

    .fl-hero h1 {
        font-size: 2rem;
    }

    .fl-hero .lead {
        font-size: 1.1rem;
    }

    .fl-lamp {
        width: 88px;
        height: 88px;
        margin-bottom: 1.25rem;
    }

    .fl-section,
    .fl-section-alt {
        padding: 3.5rem 0;
    }

    .cta-section,
    .fl-cta {
        padding: 3.5rem 0;
    }

    .fl-section-title,
    .section-title {
        font-size: 1.75rem;
    }

    .content-page {
        padding: 2.5rem 0;
    }

    .content-page h1 {
        font-size: 1.85rem;
    }
}