/* KSM × TECH / BOOK IS YOUR FRIEND PAGE STYLES */

/* ──────────────────────────────────────────────────────────
   BYF PRODUCT PAGE — "Bibliotherapy Expressive" palette
   Primary: Expressive Plum  #69548D
   Secondary: Soft Teal      #406560
   Tertiary: Dusty Rose      #7B5455
   Dark bg: warm plum-black  #16121B
   ────────────────────────────────────────────────────────── */

:root {
    --byf-plum:           #69548D;
    --byf-plum-light:     #B79FDE;
    --byf-plum-dim:       #D4BBFC;
    --byf-plum-deep:      #240E45;
    --byf-teal:           #406560;
    --byf-teal-light:     #C2EBE4;
    --byf-rose:           #7B5455;
    --byf-rose-light:     #CD9F9F;
    --byf-amber:          #FFDA73;
    --byf-amber-deep:     #4A3300;
    --byf-bg:             #16121B;
    --byf-surface:        #211B29;
    --byf-surface-high:   #2A2333;
    --byf-surface-top:    #352D40;
    --byf-text:           #E8E1EC;
    --byf-text-dim:       #CDC5D3;
    --byf-outline:        #968FA0;
}

.byf-page { background: var(--byf-bg); color: var(--byf-text); }
.byf-page section { padding: 110px 0; position: relative; }
.byf-page .container,
.byf-page .bf-narrow {
    width: min(1200px, calc(100% - 48px));
    margin: 0 auto;
}
.byf-page .bf-narrow { max-width: 880px; }

/* ─── HERO — Split: pitch + book preview ─── */
.bf-hero {
    padding: 180px 24px 100px !important;
    position: relative;
    overflow: hidden;
}

.bf-hero::before {
    content: '';
    position: absolute;
    top: 60px;
    right: -200px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(105, 84, 141, 0.12) 0%, transparent 60%);
    z-index: 0;
}

.bf-hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(64, 101, 96, 0.08) 0%, transparent 60%);
    z-index: 0;
}

.bf-hero-grid {
    width: min(1200px, calc(100% - 48px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: center;
    position: relative;
    z-index: 2;
}

@media (max-width: 960px) {
    .bf-hero-grid { grid-template-columns: 1fr; gap: 48px; }
}

.bf-deva {
    font-family: var(--devanagari);
    font-weight: 600;
    font-size: clamp(20px, 2.4vw, 28px);
    color: var(--byf-plum-dim);
    margin-bottom: 18px;
    letter-spacing: 0.01em;
    line-height: 1;
}

.bf-title {
    font-family: var(--display);
    font-size: clamp(40px, 5vw, 64px);
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    color: var(--byf-text);
}

.bf-title em {
    font-style: italic;
    color: var(--byf-plum-dim);
}

.bf-version-pill {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--byf-outline);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.bf-version-pill .dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--byf-plum-light);
    animation: bf-pulse-dot 2.2s ease-in-out infinite;
}

@keyframes bf-pulse-dot {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; box-shadow: 0 0 8px var(--byf-plum-light); }
}

.bf-h1 {
    font-family: var(--display);
    font-size: clamp(28px, 3vw, 38px);
    font-weight: 300;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--byf-text);
}

.bf-h1 em {
    font-style: italic;
    color: var(--byf-plum-dim);
}

.bf-lead {
    font-family: var(--body);
    font-size: 17px;
    line-height: 1.75;
    color: var(--byf-text-dim);
    max-width: 580px;
}

.bf-lead strong {
    color: var(--byf-text);
    font-weight: 500;
}

.bf-cta-row {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.bf-btn {
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.06em;
    padding: 14px 28px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.bf-btn-primary {
    background: var(--byf-plum);
    color: #fff;
}

.bf-btn-primary:hover {
    background: var(--byf-plum-light);
    color: var(--byf-plum-deep);
    transform: translateY(-1px);
}

.bf-btn-ghost {
    background: transparent;
    color: var(--byf-text-dim);
    border: 1px solid var(--byf-outline);
}

.bf-btn-ghost:hover {
    border-color: var(--byf-plum-dim);
    color: var(--byf-plum-dim);
}

.bf-hero-meta {
    margin-top: 28px;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--byf-outline);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bf-hero-meta .emph {
    color: var(--byf-plum-dim);
}

/* ─── HERO BOOK VISUAL ─── */
.bf-demo-book {
    background: var(--byf-surface);
    border: 1px solid rgba(183, 159, 222, 0.12);
    border-radius: 0;
    padding: 40px 32px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 380px;
}

.bf-demo-book::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, rgba(105, 84, 141, 0.15), transparent 50%, rgba(64, 101, 96, 0.1));
    z-index: 0;
    pointer-events: none;
}

.bf-book-art {
    position: relative;
    z-index: 1;
    width: 200px;
    height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bf-book-art svg {
    width: 100%;
    height: 100%;
    color: var(--byf-plum-light);
    filter: drop-shadow(0 0 24px rgba(183, 159, 222, 0.2));
}

.bf-book-label {
    font-family: var(--devanagari);
    font-size: 28px;
    font-weight: 600;
    color: var(--byf-plum-dim);
    text-align: center;
    margin-top: 20px;
    text-shadow: 0 0 40px rgba(212, 187, 252, 0.25);
    position: relative;
    z-index: 1;
}

.bf-book-caption {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--byf-outline);
    text-align: center;
    margin-top: 10px;
    position: relative;
    z-index: 1;
}

.bf-mood-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 24px;
    position: relative;
    z-index: 1;
}

.bf-mood-chip {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    padding: 6px 14px;
    border-radius: 0;
    border: 1px solid;
    transition: all 0.3s ease;
}

.bf-mood-chip.plum {
    border-color: rgba(183, 159, 222, 0.3);
    color: var(--byf-plum-dim);
    background: rgba(105, 84, 141, 0.12);
}

.bf-mood-chip.teal {
    border-color: rgba(194, 235, 228, 0.2);
    color: var(--byf-teal-light);
    background: rgba(64, 101, 96, 0.12);
}

.bf-mood-chip.rose {
    border-color: rgba(205, 159, 159, 0.25);
    color: var(--byf-rose-light);
    background: rgba(123, 84, 85, 0.12);
}

.bf-mood-chip.amber {
    border-color: rgba(255, 218, 115, 0.2);
    color: var(--byf-amber);
    background: rgba(74, 51, 0, 0.15);
}

/* ─── SECTION COMMON ─── */
.bf-section-num {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--byf-plum-light);
    display: block;
    margin-bottom: 18px;
}

.bf-h2 {
    font-family: var(--display);
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 300;
    line-height: 1.2;
    color: var(--byf-text);
    margin-bottom: 24px;
}

.bf-h2 em {
    font-style: italic;
    color: var(--byf-plum-dim);
}

.bf-section-lead {
    font-family: var(--body);
    font-size: 17px;
    line-height: 1.75;
    color: var(--byf-text-dim);
    max-width: 700px;
}

/* ─── WHAT IT IS ─── */
.bf-what {
    border-top: 1px solid var(--byf-surface-high);
}

/* ─── THREE-STEP FLOW ─── */
.bf-three-step {
    width: min(1200px, calc(100% - 48px));
    margin: 64px auto 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

@media (max-width: 768px) {
    .bf-three-step { grid-template-columns: 1fr; }
}

.bf-step {
    background: var(--byf-surface);
    border: 1px solid var(--byf-surface-high);
    padding: 40px 32px;
    transition: border-color 0.3s, transform 0.3s;
}

.bf-step:hover {
    border-color: var(--byf-plum-light);
    transform: translateY(-3px);
}

.bf-step-num {
    font-family: var(--mono);
    font-size: 32px;
    font-weight: 300;
    color: var(--byf-plum-light);
    margin-bottom: 16px;
    opacity: 0.7;
}

.bf-step h3 {
    font-family: var(--display);
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 14px;
    color: var(--byf-text);
}

.bf-step p {
    font-family: var(--body);
    font-size: 15px;
    line-height: 1.7;
    color: var(--byf-text-dim);
}

/* ─── COMPARISON SECTION ─── */
.bf-comparison {
    border-top: 1px solid var(--byf-surface-high);
}

.bf-compare-grid {
    width: min(1200px, calc(100% - 48px));
    margin: 56px auto 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

@media (max-width: 768px) {
    .bf-compare-grid { grid-template-columns: 1fr; }
}

.bf-compare-card {
    background: var(--byf-surface);
    border: 1px solid var(--byf-surface-high);
    padding: 40px 32px;
}

.bf-compare-card h3 {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--byf-outline);
    margin-bottom: 20px;
}

.bf-compare-card p {
    font-family: var(--body);
    font-size: 15px;
    line-height: 1.7;
    color: var(--byf-text-dim);
    margin-bottom: 12px;
}

.bf-compare-card strong {
    color: var(--byf-text);
}

.bf-compare-special {
    border-color: var(--byf-plum);
    background: linear-gradient(135deg, var(--byf-surface) 0%, rgba(105, 84, 141, 0.08) 100%);
}

.bf-compare-special h3 {
    color: var(--byf-plum-dim);
}

.bf-muted {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--byf-outline);
    font-style: italic;
    margin-top: 8px;
}

/* ─── SHELVES / FEELINGS ─── */
.bf-feelings {
    border-top: 1px solid var(--byf-surface-high);
}

.bf-feelings-grid {
    width: min(1200px, calc(100% - 48px));
    margin: 56px auto 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.bf-feeling {
    background: var(--byf-surface);
    border: 1px solid var(--byf-surface-high);
    padding: 32px 28px;
    transition: border-color 0.3s, transform 0.3s;
}

.bf-feeling:hover {
    transform: translateY(-2px);
}

.bf-feeling-tag {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    margin-bottom: 14px;
    display: inline-block;
    padding: 4px 10px;
    border: 1px solid;
}

.bf-feeling-tag.plum   { color: var(--byf-plum-dim); border-color: rgba(183, 159, 222, 0.3); }
.bf-feeling-tag.teal   { color: var(--byf-teal-light); border-color: rgba(194, 235, 228, 0.25); }
.bf-feeling-tag.rose   { color: var(--byf-rose-light); border-color: rgba(205, 159, 159, 0.25); }
.bf-feeling-tag.amber  { color: var(--byf-amber); border-color: rgba(255, 218, 115, 0.25); }

.bf-feeling h3 {
    font-family: var(--display);
    font-size: 20px;
    font-weight: 500;
    color: var(--byf-text);
    margin-bottom: 10px;
}

.bf-feeling p {
    font-family: var(--body);
    font-size: 14px;
    line-height: 1.65;
    color: var(--byf-text-dim);
}

/* ─── HOW IT WORKS ─── */
.bf-how {
    border-top: 1px solid var(--byf-surface-high);
}

.bf-how-grid {
    width: min(1200px, calc(100% - 48px));
    margin: 56px auto 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

.bf-how-step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 32px;
    padding: 40px 0;
    border-bottom: 1px solid var(--byf-surface-high);
    align-items: start;
}

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

@media (max-width: 600px) {
    .bf-how-step { grid-template-columns: 1fr; gap: 12px; }
}

.bf-how-num {
    font-family: var(--mono);
    font-size: 36px;
    font-weight: 300;
    color: var(--byf-plum-light);
    opacity: 0.6;
}

.bf-how-step h3 {
    font-family: var(--display);
    font-size: 22px;
    font-weight: 500;
    color: var(--byf-text);
    margin-bottom: 10px;
}

.bf-how-step p {
    font-family: var(--body);
    font-size: 15px;
    line-height: 1.7;
    color: var(--byf-text-dim);
}

/* ─── LANGUAGES ─── */
.bf-languages {
    border-top: 1px solid var(--byf-surface-high);
}

.bf-lang-grid {
    width: min(1200px, calc(100% - 48px));
    margin: 48px auto 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 768px) {
    .bf-lang-grid { grid-template-columns: 1fr; }
}

.bf-lang-card {
    background: var(--byf-surface);
    border: 1px solid var(--byf-surface-high);
    padding: 36px 28px;
    text-align: center;
    transition: border-color 0.3s;
}

.bf-lang-card:hover { border-color: var(--byf-plum-light); }

.bf-lang-script {
    font-size: 32px;
    margin-bottom: 12px;
    display: block;
}

.bf-lang-card h3 {
    font-family: var(--display);
    font-size: 20px;
    font-weight: 500;
    color: var(--byf-text);
    margin-bottom: 8px;
}

.bf-lang-card p {
    font-family: var(--body);
    font-size: 14px;
    line-height: 1.6;
    color: var(--byf-text-dim);
}

/* ─── STATUS ─── */
.bf-status {
    border-top: 1px solid var(--byf-surface-high);
    text-align: center;
}

.bf-status-label {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    color: var(--byf-plum-light);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    padding: 8px 20px;
    border: 1px solid rgba(183, 159, 222, 0.25);
}

.bf-status-label .dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--byf-plum-light);
    animation: bf-pulse-dot 2.2s ease-in-out infinite;
}

.bf-status-body {
    font-family: var(--body);
    font-size: 17px;
    line-height: 1.75;
    color: var(--byf-text-dim);
    max-width: 600px;
    margin: 0 auto 32px;
}

.bf-status-body strong { color: var(--byf-text); }

/* ─── CLOSING ─── */
.bf-closing {
    border-top: 1px solid var(--byf-surface-high);
    text-align: center;
    padding: 80px 0 !important;
}

.bf-closing-quote {
    font-family: var(--display);
    font-size: clamp(22px, 2.8vw, 32px);
    font-weight: 300;
    font-style: italic;
    color: var(--byf-text-dim);
    max-width: 680px;
    margin: 0 auto 32px;
    line-height: 1.5;
}

.bf-closing-quote em {
    color: var(--byf-plum-dim);
    font-style: italic;
}

.bf-back-link {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--byf-outline);
    text-decoration: none;
    letter-spacing: 0.06em;
    transition: color 0.2s;
}

.bf-back-link:hover { color: var(--byf-plum-dim); }

/* ─── REVEAL ANIMATION ─── */
.byf-page .reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.byf-page .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── HEADER & LOGO THEME OVERRIDES ─── */
.byf-page .header.scrolled {
    background: rgba(22, 18, 27, 0.88);
    border-bottom-color: rgba(183, 159, 222, 0.18);
}

.byf-page .logo-mark {
    color: var(--byf-plum-light) !important;
}

.byf-page .logo-x {
    color: var(--byf-plum-light) !important;
}

.byf-page .nav a {
    color: var(--byf-text-dim);
}

.byf-page .nav a:hover {
    color: var(--byf-plum-dim);
}

.byf-page .nav a::after {
    background: var(--byf-plum-light);
}

.byf-page .nav-cta {
    color: var(--byf-text) !important;
    border-color: rgba(183, 159, 222, 0.28) !important;
}

.byf-page .nav-cta:hover {
    background: var(--byf-plum-light) !important;
    color: var(--byf-bg) !important;
    border-color: var(--byf-plum-light) !important;
}