/* ============================================================
   MediQuiz — Landing page CSS
   Mobile-first (375px). BEM methodology. Independent from dashboard.css.
   ============================================================ */

/* ------------------------------------------------------------
   Design tokens
   ------------------------------------------------------------ */
:root {
    --color-primary:        #2563EB;
    --color-primary-hover:  #1D4ED8;
    --color-primary-light:  #EFF6FF;
    --color-accent:         #059669;
    --color-accent-light:   #ECFDF5;
    --color-premium:        #7C3AED;
    --color-premium-light:  #F5F3FF;

    --color-bg:             #F8FAFC;
    --color-surface:        #FFFFFF;
    --color-border:         #E2E8F0;

    --color-text:           #0F172A;
    --color-text-secondary: #475569;
    --color-text-muted:     #94A3B8;
    --color-text-on-primary:#FFFFFF;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs:   0.75rem;
    --font-size-sm:   0.875rem;
    --font-size-base: 1rem;
    --font-size-lg:   1.125rem;
    --font-size-xl:   1.25rem;
    --font-size-2xl:  1.5rem;
    --font-size-3xl:  1.875rem;
    --font-size-4xl:  2.25rem;
    --font-size-5xl:  3rem;

    --font-weight-normal:   400;
    --font-weight-medium:   500;
    --font-weight-semibold: 600;
    --font-weight-bold:     700;
    --font-weight-extrabold:800;

    --space-1:  0.25rem;
    --space-2:  0.5rem;
    --space-3:  0.75rem;
    --space-4:  1rem;
    --space-5:  1.25rem;
    --space-6:  1.5rem;
    --space-8:  2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    --radius-sm:   0.25rem;
    --radius-md:   0.5rem;
    --radius-lg:   0.75rem;
    --radius-xl:   1rem;
    --radius-2xl:  1.5rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.10), 0 10px 10px -5px rgba(0,0,0,0.04);

    --navbar-height: 64px;
    --container-max: 1160px;
    --container-px:  1rem;

    --transition-fast: 0.12s ease;
    --transition-base: 0.2s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

/* ------------------------------------------------------------
   Container
   ------------------------------------------------------------ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-px);
    padding-right: var(--container-px);
}

/* ------------------------------------------------------------
   Buttons
   ------------------------------------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.625rem var(--space-5);
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    cursor: pointer;
    border: 2px solid transparent;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                color var(--transition-fast),
                box-shadow var(--transition-fast),
                transform var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
}

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

.btn:active {
    transform: translateY(0);
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-on-primary);
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn--ghost:hover {
    background-color: var(--color-primary-light);
}

.btn--ghost-white {
    background-color: transparent;
    color: var(--color-text-on-primary);
    border-color: rgba(255,255,255,0.6);
}

.btn--ghost-white:hover {
    background-color: rgba(255,255,255,0.12);
    border-color: #fff;
}

.btn--lg {
    font-size: var(--font-size-base);
    padding: 0.875rem var(--space-8);
}

/* ------------------------------------------------------------
   Navbar
   ------------------------------------------------------------ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--navbar-height);
    background-color: rgba(248, 250, 252, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar__logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    letter-spacing: -0.02em;
    text-decoration: none;
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.navbar__login {
    display: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.navbar__login:hover {
    color: var(--color-primary);
}

/* ------------------------------------------------------------
   Hero
   ------------------------------------------------------------ */
.hero {
    padding: var(--space-16) 0 var(--space-12);
    background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 50%, #F5F3FF 100%);
    overflow: hidden;
}

.hero__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-10);
}

.hero__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.hero__headline {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.hero__headline em {
    font-style: normal;
    color: var(--color-primary);
}

.hero__subheadline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 480px;
}

.hero__ctas {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    align-items: center;
}

.hero__image {
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border);
    width: 100%;
}

/* ------------------------------------------------------------
   Section shared
   ------------------------------------------------------------ */
.section {
    padding: var(--space-16) 0;
}

.section--alt {
    background-color: var(--color-surface);
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--space-3);
}

.section__subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    max-width: 520px;
    margin: 0 auto;
}

/* ------------------------------------------------------------
   Features
   ------------------------------------------------------------ */
.features__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.feature-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-card__icon {
    width: 44px;
    height: 44px;
    background-color: var(--color-primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    color: var(--color-primary);
    flex-shrink: 0;
}

.feature-card__icon svg {
    width: 22px;
    height: 22px;
}

.feature-card__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.feature-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ------------------------------------------------------------
   Screenshots
   ------------------------------------------------------------ */
.screenshots__tabs {
    display: flex;
    gap: var(--space-2);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: var(--space-1);
    margin-bottom: var(--space-6);
}

.screenshots__tabs::-webkit-scrollbar {
    display: none;
}

.screenshots__tab {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: background-color var(--transition-fast),
                color var(--transition-fast),
                border-color var(--transition-fast);
}

.screenshots__tab.is-active,
.screenshots__tab:hover {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.screenshots__panels {
    position: relative;
}

.screenshots__panel {
    display: none;
}

.screenshots__panel.is-active {
    display: block;
}

.screenshots__panel-inner {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
}

.screenshots__img {
    width: 100%;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.screenshots__caption {
    margin-top: var(--space-5);
    padding: 0 var(--space-2);
}

.screenshots__caption-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.screenshots__caption-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ------------------------------------------------------------
   Pricing
   ------------------------------------------------------------ */
.pricing__grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.plan-card {
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    position: relative;
    transition: box-shadow var(--transition-base);
}

.plan-card:hover {
    box-shadow: var(--shadow-lg);
}

.plan-card--featured {
    border-color: var(--color-premium);
}

.plan-card__badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-premium);
    color: #fff;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.plan-card__name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.plan-card__price {
    margin-bottom: var(--space-6);
}

.plan-card__amount {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-text);
    letter-spacing: -0.04em;
    line-height: 1;
}

.plan-card__amount span {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-secondary);
    letter-spacing: 0;
}

.plan-card__period {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.plan-card__features {
    list-style: none;
    margin-bottom: var(--space-8);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.plan-card__features li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.plan-card__check {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1px;
}

.plan-card__check svg {
    width: 10px;
    height: 10px;
}

.plan-card--featured .plan-card__check {
    background-color: var(--color-premium-light);
    color: var(--color-premium);
}

.plan-card__cta {
    width: 100%;
    justify-content: center;
}

.plan-card--featured .btn--primary {
    background-color: var(--color-premium);
    border-color: var(--color-premium);
}

.plan-card--featured .btn--primary:hover {
    background-color: #6D28D9;
    border-color: #6D28D9;
}

/* ------------------------------------------------------------
   CTA final
   ------------------------------------------------------------ */
.cta-final {
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, #1E40AF 100%);
    text-align: center;
    color: #fff;
}

.cta-final__title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-3);
}

.cta-final__subtitle {
    font-size: var(--font-size-base);
    color: rgba(255,255,255,0.8);
    margin-bottom: var(--space-8);
}

.cta-final__btn {
    background-color: #fff;
    color: var(--color-primary);
    border-color: #fff;
    font-size: var(--font-size-base);
    padding: 0.875rem var(--space-10);
}

.cta-final__btn:hover {
    background-color: #F0F9FF;
    border-color: #F0F9FF;
    box-shadow: var(--shadow-lg);
}

.cta-final__note {
    margin-top: var(--space-4);
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.6);
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.footer {
    background-color: var(--color-text);
    color: rgba(255,255,255,0.7);
    padding: var(--space-8) 0;
}

.footer__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
    text-align: center;
}

.footer__logo {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #fff;
}

.footer__copy {
    font-size: var(--font-size-sm);
}

.footer__links {
    display: flex;
    gap: var(--space-6);
    list-style: none;
}

.footer__links a {
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.6);
    transition: color var(--transition-fast);
}

.footer__links a:hover {
    color: #fff;
}

/* ------------------------------------------------------------
   Responsive — tablet / desktop
   ------------------------------------------------------------ */
@media (min-width: 640px) {
    :root {
        --container-px: 1.5rem;
    }

    .navbar__login {
        display: inline-flex;
    }

    .hero__headline {
        font-size: var(--font-size-4xl);
    }

    .screenshots__panel-inner {
        padding: var(--space-6);
    }

    .pricing__grid {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .plan-card {
        flex: 1 1 280px;
        max-width: 340px;
    }

    .footer__inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

@media (min-width: 1024px) {
    :root {
        --container-px: 2rem;
    }

    .hero {
        padding: var(--space-24) 0 var(--space-20);
    }

    .hero__inner {
        flex-direction: row;
        align-items: center;
        gap: var(--space-16);
    }

    .hero__content {
        flex: 1 1 45%;
        max-width: 560px;
    }

    .hero__headline {
        font-size: var(--font-size-5xl);
    }

    .hero__image-wrap {
        flex: 1 1 50%;
    }

    .section__title {
        font-size: var(--font-size-3xl);
    }

    .features__grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .pricing__grid {
        flex-wrap: nowrap;
        justify-content: center;
        gap: var(--space-6);
    }

    .plan-card {
        flex: 1 1 0;
        max-width: 360px;
    }

    .cta-final__title {
        font-size: var(--font-size-4xl);
    }
}