/* ─── LANDING SECTIONS ────────────────────────────────────────────────────
   Секции лендинга: pain, mechanics, demo, why, final-cta.
   Используется только: landing.html
   ─────────────────────────────────────────────────────────────────────── */

/* ── PAIN ── */

.pain {
    background: var(--white);
    padding: 0;
}

.pain-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.pain-card {
    position: relative;
    padding: 40px 44px 40px 76px;
    border: 1px solid var(--border);
    border-top: none;
    border-left: none;
}

.pain-card + .pain-card {
    border-left: none;
}

.pain-label {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 36px;
    background: linear-gradient(160deg, #1a7a97 0%, #093348 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .2em;
    color: rgba(255,255,255,.88);
    text-transform: uppercase;
    user-select: none;
}

.pain-text {
    font-size: clamp(1.05rem, 1.3vw, 1.15rem);
    font-weight: 500;
    line-height: 1.65;
    color: var(--text-1);
}

.pain-text em {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-weight: 700;
}

/* ── MECHANICS ── */

.mechanics {
    background: var(--light-bg);
    padding: 96px var(--pad);
}

.mechanics-inner {
    max-width: var(--W);
    margin: 0 auto;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.step {
    position: relative;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 36px 36px;
    overflow: hidden;
}

.step-num {
    position: absolute;
    top: -10px;
    right: 16px;
    font-size: 8rem;
    font-weight: 800;
    line-height: 1;
    color: rgba(27,122,148,.11);
    letter-spacing: -.04em;
    user-select: none;
    pointer-events: none;
}

.step-icon {
    display: block;
    width: 44px;
    height: 44px;
    margin-bottom: 20px;
    object-fit: contain;
}

.step-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 8px;
}

.step-desc {
    font-size: .9375rem;
    color: var(--text-2);
    line-height: 1.65;
}

/* ── DEMO ── */

.demo {
    background: var(--white);
    padding: 96px var(--pad);
}

.demo-inner {
    max-width: var(--W);
    margin: 0 auto;
}

.demo-intro {
    margin-bottom: 72px;
}

.demo-intro-eyebrow {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 20px;
}

.demo-intro-heading {
    font-size: clamp(2.25rem, 4vw, 3.25rem);
    font-weight: 800;
    letter-spacing: -.04em;
    color: var(--text-1);
    line-height: 1.1;
    margin-bottom: 14px;
}

.demo-intro-heading .num {
    color: var(--teal);
}

.demo-intro-sub {
    font-size: clamp(.9375rem, 1.4vw, 1.0625rem);
    color: var(--text-2);
    line-height: 1.6;
}

.demo-activity-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 0 rgba(34,197,94,.4);
    animation: livePulse 2s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes livePulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,.4); }
    50%       { box-shadow: 0 0 0 5px rgba(34,197,94,0); }
}

.demo-block {
    margin-bottom: 80px;
}

.demo-block:last-child {
    margin-bottom: 0;
}

.demo-eyebrow {
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 12px;
}

.demo-heading {
    font-size: clamp(1.375rem, 2.5vw, 1.75rem);
    font-weight: 700;
    letter-spacing: -.025em;
    color: var(--text-1);
    margin-bottom: 32px;
}

/* YouTube gallery */

.yt-slider-outer {
    position: relative;
}

.yt-slider {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 12px 0 20px;
    margin: -12px 0 -20px;
}

.yt-slider::-webkit-scrollbar {
    display: none;
}

.yt-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background: var(--light-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--t-base), box-shadow var(--t-base);
    text-decoration: none;
    color: inherit;
}

.yt-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 28px rgba(0,0,0,.09);
}

.yt-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: flex-end;
    padding: 14px;
    position: relative;
    overflow: hidden;
    border-radius: 12px 12px 0 0;
}

.yt-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.yt-body {
    padding: 16px;
}

.yt-channel {
    font-size: .75rem;
    font-weight: 600;
    color: var(--teal);
    margin-bottom: 4px;
}

.yt-title {
    font-size: .875rem;
    font-weight: 600;
    line-height: 1.45;
    color: var(--text-1);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.yt-pills-wrap {
    position: relative;
    max-height: 58px;
    overflow: hidden;
}

.yt-pills-wrap::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 24px;
    background: linear-gradient(transparent, #f7f8fa);
    pointer-events: none;
}

.yt-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.yt-pill {
    font-size: .72rem;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    background: var(--teal-bg);
    color: var(--teal-dark);
    border: 1px solid rgba(27,122,148,.15);
}

.yt-cta-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background: linear-gradient(160deg, #071e2a 0%, #0c3545 55%, #145f73 100%);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    text-align: left;
    padding: 32px 28px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.yt-cta-card::before {
    content: '';
    position: absolute;
    top: -60px; right: -60px;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(20,95,115,.55) 0%, transparent 70%);
    pointer-events: none;
}

.yt-cta-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    background: rgba(255,255,255,.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: rgba(255,255,255,.9);
}

.yt-cta-heading {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.3;
    margin-bottom: 8px;
}

.yt-cta-heading em {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-weight: 700;
}

.yt-cta-sub {
    font-size: .8125rem;
    color: rgba(255,255,255,.5);
    line-height: 1.5;
    margin-bottom: 24px;
}

.yt-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 11px 20px;
    border-radius: 10px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.18);
    color: var(--white);
    font-size: .875rem;
    font-weight: 700;
    transition: background var(--t-fast), border-color var(--t-fast);
}

.yt-cta-card:hover .yt-cta-btn {
    background: rgba(255,255,255,.2);
    border-color: rgba(255,255,255,.3);
}

/* Article demo — интерактивный отрывок с подсказками */

.demo-article-wrap {
    max-width: 760px;
    margin: 0 auto;
}

.article-source {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    text-decoration: none;
    color: inherit;
}

.article-badge {
    font-size: .7rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--text-3);
    background: var(--light-bg);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: 6px;
}

.article-title-label {
    font-size: .875rem;
    font-weight: 500;
    color: var(--text-2);
    font-style: italic;
}

.article-box {
    background: var(--light-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 40px;
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-1);
}

.article-hint {
    font-size: .8rem;
    color: var(--text-3);
    margin-top: 10px;
    text-align: center;
}

/* Highlighted word with tooltip */
.hw {
    position: relative;
    display: inline;
    background: rgba(27,122,148,.1);
    border-bottom: 2px solid var(--teal);
    border-radius: 3px;
    padding: 1px 2px;
    cursor: pointer;
    transition: background var(--t-fast);
}

.hw:hover {
    background: rgba(27,122,148,.2);
}

.hw-tip {
    display: none;
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-1);
    color: var(--white);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: .8125rem;
    white-space: nowrap;
    z-index: 50;
    box-shadow: 0 8px 24px rgba(0,0,0,.2);
    text-align: center;
    line-height: 1.5;
    min-width: 150px;
}

.hw-tip::after {
    content: '';
    position: absolute;
    top: 100%; left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--text-1);
}

.hw-tip .tip-w {
    display: block;
    font-size: .7rem;
    color: rgba(255,255,255,.5);
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.hw-tip .tip-t {
    display: block;
    font-weight: 600;
}

.hw.open .hw-tip {
    display: block;
}

/* Quiz section */

.quiz-section-bg {
    background: var(--light-bg);
    border-radius: 20px;
    padding: 32px;
}

.quiz-outer {
    max-width: 720px;
    margin: 0 auto;
}

.quiz-card {
    background: var(--white);
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 24px rgba(0,0,0,.07);
    overflow: hidden;
}

.quiz-word-area {
    padding: 52px 64px 40px;
    text-align: center;
    background: linear-gradient(155deg, #e8f6fb 0%, var(--white) 55%);
    border-bottom: 1px solid var(--border);
}

.quiz-mode-prompt {
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: 20px;
}

.quiz-word {
    font-size: 3.25rem;
    font-weight: 800;
    letter-spacing: -.02em;
    color: var(--text-1);
    line-height: 1.1;
    animation: wordPop .3s cubic-bezier(.34,1.56,.64,1);
}

@keyframes wordPop { from { transform: scale(.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.quiz-ipa {
    font-size: .875rem;
    color: var(--text-3);
    margin-top: 6px;
    min-height: 22px;
}

.quiz-opts-section {
    padding: 32px 48px 40px;
}

.quiz-opts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.quiz-opt {
    padding: 18px 22px;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-1);
    background: var(--white);
    text-align: left;
    line-height: 1.4;
    transition: border-color var(--t-fast), background var(--t-fast);
    animation: optFade .3s ease-out both;
    cursor: pointer;
}

.quiz-opt:nth-child(1) { animation-delay: .04s; }
.quiz-opt:nth-child(2) { animation-delay: .08s; }
.quiz-opt:nth-child(3) { animation-delay: .12s; }
.quiz-opt:nth-child(4) { animation-delay: .16s; }

@keyframes optFade { from { transform: translateY(6px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.quiz-opt:hover:not(:disabled)  { border-color: var(--teal); background: var(--teal-bg); }
.quiz-opt:active:not(:disabled) { transform: scale(.99); }
.quiz-opt:disabled              { cursor: default; }

.quiz-opt.correct { border-color: #16a34a !important; border-width: 2px; background: #f0fdf4 !important; color: #166534; font-weight: 600; pointer-events: none; }
.quiz-opt.wrong   { border-color: #dc2626 !important; border-width: 2px; background: #fef2f2 !important; color: #991b1b; font-weight: 600; pointer-events: none; animation: shake .4s ease; }
.quiz-opt.dim     { opacity: .25; pointer-events: none; }

@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)} }

.quiz-btn-next {
    width: 100%;
    margin-top: 20px;
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: .9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t-base), color var(--t-base);
}

.quiz-btn-next.idle {
    background: var(--light-bg);
    color: var(--text-3);
    border: 1.5px solid var(--border);
    cursor: not-allowed;
}

.quiz-btn-next.ready {
    background: var(--teal);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.quiz-btn-next.ready:hover { background: var(--teal-dark); }

.quiz-btn-next.ready::before {
    content: '';
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: 0%;
    background: rgba(255,255,255,.18);
    pointer-events: none;
}

.quiz-btn-next.ready.filling::before {
    width: 100%;
    transition: width 3000ms linear;
}

.quiz-done {
    display: none;
    background: var(--white);
    border-radius: 20px;
    border: 1px solid var(--border);
    padding: 52px 40px;
    text-align: center;
    animation: fadeUp .4s ease both;
}

.quiz-done.show { display: block; }

@keyframes fadeUp { from { transform: translateY(14px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.quiz-done-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.quiz-done-sub {
    font-size: .9375rem;
    color: var(--text-2);
    line-height: 1.65;
    margin-bottom: 32px;
    max-width: 380px;
    margin-left: auto;
    margin-right: auto;
}

.quiz-again {
    display: block;
    font-size: .8125rem;
    color: var(--text-3);
    font-weight: 500;
    margin-top: 12px;
    cursor: pointer;
}

.quiz-again:hover { color: var(--text-2); }

.demo-cta-row {
    margin-top: 56px;
    text-align: center;
}

/* ── WHY ── */

.why {
    background: var(--light-bg);
    padding: 96px var(--pad);
}

.why-inner {
    max-width: var(--W);
    margin: 0 auto;
}

.why-intro {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.8;
    color: var(--text-2);
    max-width: 620px;
    margin: 0 auto 64px;
    text-align: center;
}

.why-intro em,
.why .section-title em,
.why-tagline em {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-weight: 700;
    color: var(--text-1);
}

.why-tagline em {
    color: inherit;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    margin-bottom: 36px;
}

.stat {
    background: var(--white);
    border: 1px solid var(--border);
    padding: 52px 40px;
    text-align: center;
}

.stat:first-child { border-radius: 16px 0 0 16px; }
.stat:last-child  { border-radius: 0 16px 16px 0; }
.stat + .stat     { border-left: none; }

.stat-num {
    font-size: clamp(2.75rem, 5vw, 4.25rem);
    font-weight: 800;
    letter-spacing: -.04em;
    color: var(--teal);
    line-height: 1;
    margin-bottom: 14px;
}

.stat-desc {
    font-size: .9375rem;
    color: var(--text-2);
    line-height: 1.55;
    margin-bottom: 10px;
}

.stat-src {
    font-size: .75rem;
    color: var(--text-3);
}

.why-tagline {
    text-align: center;
    font-size: 1rem;
    color: var(--text-2);
    font-style: italic;
}

/* ── FINAL CTA ── */

.final-cta {
    background: linear-gradient(150deg, #071e2a 0%, #0c3545 40%, #145f73 100%);
    padding: 0 var(--pad);
    overflow: hidden;
}

.final-cta-inner {
    max-width: var(--W);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 64px;
    padding: clamp(64px, 8vw, 96px) 0;
}

.final-cta-title {
    font-size: clamp(2.25rem, 4vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -.04em;
    color: var(--white);
    margin-bottom: 16px;
}

.final-cta-sub {
    font-size: clamp(1rem, 1.8vw, 1.125rem);
    color: rgba(255,255,255,.5);
    margin-bottom: 40px;
}

.final-cta-media {
    display: flex;
    align-items: center;
    justify-content: center;
}

.final-cta-photo {
    width: 100%;
    max-width: 520px;
    height: 340px;
    object-fit: cover;
    object-position: center;
    border-radius: 20px;
    display: block;
}

.final-cta-photo-placeholder {
    width: 100%;
    max-width: 520px;
    height: 340px;
    border-radius: 20px;
    background: rgba(255,255,255,.06);
    border: 1.5px dashed rgba(255,255,255,.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: rgba(255,255,255,.3);
    font-size: .875rem;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    /* Pain */
    .pain-grid { grid-template-columns: 1fr; }
    .pain-card {
        padding: 28px 24px 28px 52px;
        border-top: 1px solid var(--border);
        border-left: none !important;
        border-right: none;
    }
    .pain-card:first-child { border-top: none; }
    .pain-label { width: 24px; font-size: .6rem; letter-spacing: .15em; }
    .pain-text  { font-size: .9375rem; }

    /* Mechanics */
    .mechanics { padding: 56px 20px; }
    .section-title { font-size: clamp(1.5rem, 6.5vw, 2rem); margin-bottom: 36px; }
    .steps { grid-template-columns: 1fr; gap: 10px; }
    .step { padding: 24px 20px 24px 28px; border-radius: 16px; }
    .step-num { font-size: 4rem; top: -4px; right: 10px; }
    .step-icon { width: 36px; height: 36px; margin-bottom: 14px; }
    .step-title { font-size: 1rem; margin-bottom: 8px; }
    .step-desc  { font-size: .875rem; }

    /* Demo */
    .demo { padding: 56px 20px; }
    .demo-intro { margin-bottom: 44px; }
    .demo-intro-heading { font-size: clamp(2rem, 9vw, 2.75rem); }
    .demo-intro-sub { font-size: .9375rem; }
    .demo-block { margin-bottom: 52px; }
    .demo-eyebrow  { font-size: .7rem; }
    .demo-heading  { font-size: clamp(1.25rem, 5.5vw, 1.625rem); margin-bottom: 20px; }

    /* YouTube slider */
    .yt-slider-outer { margin: 0 -20px; padding: 0 20px; }
    .yt-card { flex: 0 0 255px; }
    .yt-thumb { aspect-ratio: 16 / 9; }
    .yt-body  { padding: 14px 16px 16px; }
    .yt-title { font-size: .8125rem; margin-bottom: 10px; }
    .yt-cta-card { flex: 0 0 230px; padding: 24px 22px; }
    .yt-cta-heading { font-size: 1.375rem; }
    .yt-cta-sub { font-size: .8125rem; }

    /* Article demo */
    .article-source { flex-direction: column; gap: 4px; margin-bottom: 16px; }
    .article-box {
        position: relative;
        padding: 22px 20px;
        max-height: 300px;
        overflow: hidden;
        border-radius: 14px;
        font-size: .9375rem;
        line-height: 1.75;
    }
    .article-box::after {
        content: '';
        position: absolute;
        bottom: 0; left: 0; right: 0;
        height: 72px;
        background: linear-gradient(transparent, var(--light-bg));
        pointer-events: none;
    }
    .article-hint { margin-top: 8px; }

    /* Quiz */
    .quiz-section-bg { padding: 0; border-radius: 16px; overflow: hidden; }
    .quiz-card { border-radius: 16px; }
    .quiz-word-area { padding: 36px 24px 28px; }
    .quiz-word { font-size: 2.375rem; }
    .quiz-mode-prompt { font-size: .75rem; margin-bottom: 10px; }
    .quiz-opts { grid-template-columns: 1fr; gap: 10px; }
    .quiz-opts-section { padding: 20px 20px 24px; }
    .quiz-opt { padding: 14px 20px; font-size: .9375rem; border-radius: 12px; }
    .quiz-btn-next { width: 100%; margin-top: 16px; padding: 14px 20px; }

    /* Why */
    .why { padding: 56px 20px; }
    .why-intro { font-size: .9375rem; margin-bottom: 36px; }
    .why .section-title { font-size: clamp(1.5rem, 6.5vw, 2rem); }
    .why-tagline { font-size: .9375rem; }
    .stats { grid-template-columns: 1fr; gap: 0; border-radius: 16px; overflow: hidden; }
    .stat { padding: 32px 24px; text-align: left; }
    .stat:first-child { border-radius: 0; }
    .stat:last-child  { border-radius: 0; }
    .stat + .stat { border-left: none; border-top: 1px solid var(--border); }
    .stat-num { font-size: clamp(2.5rem, 10vw, 3.25rem); }

    /* Final CTA */
    .final-cta { padding: 0 20px; }
    .final-cta-inner { grid-template-columns: 1fr; gap: 0; padding: 56px 0 0; }
    .final-cta-content { padding-bottom: 40px; }
    .final-cta-title { font-size: clamp(1.75rem, 7vw, 2.25rem); }
    .final-cta-sub { font-size: .9375rem; }
    .final-cta-media { justify-content: flex-start; }
    .final-cta-photo { width: 100%; max-width: 100%; height: 240px; border-radius: 16px 16px 0 0; }
    .btn-final { width: 100%; justify-content: center; }
}