/* ==========================================================
   RESPONSIVE BREAKPOINTS — scoped to .landing-v3
   - 1540px        Desktop narrow (typography scale-down)
   - 1400px        Desktop compact (phone shrinks)
   - 1279px        Tablet landscape (phone smaller, content adapts)
   - 1023px        Tablet portrait (phone inline, stacked layouts)
   - 767px         Mobile (compact everything)
   ========================================================== */

/* ========== DESKTOP NARROW (≤1540px) ========== */
@media (max-width: 1540px) {
    .landing-v3 .library-hero__title { font-size: 40px; }
    .landing-v3 .library-hero__subtitle { font-size: 28px; }
}

/* ========== DESKTOP COMPACT (≤1400px) ========== */
@media (max-width: 1400px) {
    .landing-v3 {
        --phone-width: 250px;
        --phone-height: 520px;
    }
}

/* ========== TABLET LANDSCAPE (≤1279px) ========== */
@media (max-width: 1279px) {
    .landing-v3 {
        --phone-width: 220px;
        --phone-height: 460px;
        --text-section-title: 32px;
    }

    /* Hero */
    .landing-v3 .library-hero__title { font-size: 40px; }
    .landing-v3 .library-hero__subtitle { font-size: 28px; }

    /* Features strip */
    .landing-v3 .feature-icon-block { max-width: 200px; }
    .landing-v3 .feature-icon-block__icon { width: 56px; height: 68px; }
    .landing-v3 .feature-icon-block__text { font-size: 15px; }

    /* How it works */
    .landing-v3 .how-it-works__visual { width: 300px; }

    /* Training */
    .landing-v3 .training-grid { grid-template-columns: repeat(2, 1fr); }

    /* Stats */
    .landing-v3 .stats-strip__inner { gap: 48px; }
    .landing-v3 .stat-block__number { font-size: 40px; }
}

/* ========== TABLET PORTRAIT (≤1023px) ========== */
@media (max-width: 1023px) {
    .landing-v3 {
        --phone-width: 240px;
        --phone-height: 500px;
    }

    /* Phone — static, centered */
    .landing-v3 .phone-fixed {
        position: static;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 40px 0;
        margin: 0 auto;
    }

    /* Header */
    .landing-v3 .header__nav { display: none; }

    /* Hero */
    .landing-v3 .library-hero { min-height: auto; }
    .landing-v3 .library-hero .container {
        /* tablet: header-total без дополнительного воздуха */
        padding-top: var(--header-total);
        padding-right: var(--side-pad);
        text-align: center;
    }
    .landing-v3 .library-hero__title { font-size: 36px; }
    .landing-v3 .library-hero__subtitle { font-size: 24px; }
    .landing-v3 .library-hero__cta-block { align-items: center; }
    .landing-v3 .library-hero__stores { justify-content: center; }

    /* Features strip */
    .landing-v3 .features-strip .container { padding-right: var(--side-pad); }
    .landing-v3 .features-strip__inner {
        flex-direction: column;
        gap: 32px;
        align-items: center;
    }

    /* How it works */
    .landing-v3 .how-it-works .container { padding-right: var(--side-pad); }
    .landing-v3 .how-it-works__inner {
        flex-direction: column;
        text-align: center;
    }
    .landing-v3 .how-it-works__visual { width: 260px; margin: 0 auto; }
    .landing-v3 .how-it-works--reverse .how-it-works__inner { flex-direction: column; }

    /* Training */
    .landing-v3 .training-v3 .container { padding-right: var(--side-pad); }
    .landing-v3 .training-v3__title { text-align: center; }
    .landing-v3 .training-v3__subtitle { text-align: center; margin-left: auto; margin-right: auto; }
    .landing-v3 .training-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 100%;
    }

    /* Stats */
    .landing-v3 .stats-strip__inner {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    /* Books */
    .landing-v3 .books-section__title { text-align: center; }
    .landing-v3 .books-section__desc { text-align: center; margin-left: auto; margin-right: auto; }
    .landing-v3 .books-grid { max-width: 100%; }

    /* Classla */
    .landing-v3 .classla-block { flex-direction: column; align-items: center; text-align: center; }
    .landing-v3 .classla-block__bar { width: 60px; min-height: 3px; }
}

/* ========== MOBILE (≤767px) ========== */
@media (max-width: 767px) {
    .landing-v3 {
        --phone-width: 200px;
        --phone-height: 420px;
        --side-pad: 20px;
        --header-height: 70px;
        --text-section-title: 26px;
        --text-body-lg: 16px;
        --text-body: 14px;
        --text-body-sm: 13px;
        --section-pad-lg: 60px;
        --section-pad-md: 48px;
        --section-pad-sm: 40px;
    }

    /* Header */
    .landing-v3 .header__logo span { font-size: var(--text-body); }
    .landing-v3 .header__login { font-size: var(--text-body-sm); padding: 10px 24px; }

    /* Hero */
    .landing-v3 .library-hero .container { padding-top: calc(var(--header-total) + 10px); padding-bottom: 40px; }
    .landing-v3 .library-hero__title { font-size: 28px; line-height: 1.4; }
    .landing-v3 .library-hero__subtitle { font-size: 20px; margin-bottom: 32px; }
    .landing-v3 .library-hero__stores { gap: 16px; }
    .landing-v3 .library-hero__store-badge:first-child { width: 120px; }
    .landing-v3 .library-hero__store-badge:last-child { width: 135px; }

    /* Buttons */
    .landing-v3 .btn-primary { font-size: 20px; padding: 14px 28px; }

    /* Phone */
    .landing-v3 .phone-fixed { padding: 24px 0; }

    /* Features strip */
    .landing-v3 .features-strip .container { padding-top: 30px; padding-bottom: 40px; }

    /* Training */
    .landing-v3 .training-grid { grid-template-columns: 1fr; }
    .landing-v3 .training-v3__sm2 { padding: 16px 20px; }

    /* Stats */
    .landing-v3 .stat-block__number { font-size: 36px; }

    /* Books */
    .landing-v3 .books-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 20px; }

    /* Footer */
    .landing-v3 .footer__columns { flex-direction: column; gap: 24px; }
    .landing-v3 .footer__bottom { flex-direction: column; gap: 12px; }
}