/* ==========================================================================
   Logic Typing Tutor — Homepage
   ========================================================================== */

/* Top utility bar */
.utility-bar {
    background: linear-gradient(90deg, var(--color-ink), var(--color-deep-teal));
    padding: var(--space-3) var(--space-5);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    font-size: var(--font-size-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    gap: var(--space-4);
    color: var(--color-steel);
}

.utility-bar a {
    text-decoration: none;
    color: var(--color-ice);
    font-weight: 600;
    transition: color var(--duration-base) var(--ease-out);
}

.utility-bar a:hover {
    color: var(--color-bright-teal);
}

.utility-bar__item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.utility-bar__icon {
    color: var(--color-bright-teal);
}

.social-nav {
    display: flex;
    gap: var(--space-4);
    list-style: none;
    margin: 0;
    padding: 0;
}

.social-nav a {
    display: inline-flex;
    color: var(--color-steel);
    transition: color var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out);
}

.social-nav a:hover {
    color: var(--color-white);
    transform: translateY(-2px);
}

/* Site header */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.125rem 2.25rem;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.site-logo {
    font-size: 1.625rem;
    font-weight: 800;
    color: var(--color-navy);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    letter-spacing: var(--letter-spacing-tight);
    text-decoration: none;
}

.site-logo__icon {
    font-size: 1.875rem;
    color: var(--color-teal);
}

/* Primary navigation */
.primary-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    list-style: none;
    margin: 0;
    padding: 0;
}

.primary-nav__list a,
.primary-nav__list summary {
    position: relative;
    text-decoration: none;
    color: var(--color-navy);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: var(--letter-spacing-wide);
    transition: color var(--duration-base) var(--ease-out);
    cursor: pointer;
    list-style: none;
}

.primary-nav__list summary::-webkit-details-marker {
    display: none;
}

.primary-nav__list a::after,
.primary-nav__list summary::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.5rem;
    width: 0;
    height: 2px;
    background: var(--color-bright-teal);
    transition: width var(--duration-base) var(--ease-out);
}

.primary-nav__list a:hover,
.primary-nav__list a:focus-visible,
.primary-nav__list details[open] > summary,
.primary-nav__list summary:hover {
    color: var(--color-teal);
}

.primary-nav__list a:hover::after,
.primary-nav__list a:focus-visible::after,
.primary-nav__list details[open] > summary::after,
.primary-nav__list summary:hover::after {
    width: 100%;
}

/* Dropdown — keyboard accessible via <details> */
.nav-dropdown {
    position: relative;
}

.nav-dropdown__panel {
    position: absolute;
    top: calc(100% + 0.75rem);
    left: 0;
    min-width: 15.625rem;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    overflow: hidden;
    border-top: 3px solid var(--color-bright-teal);
    z-index: 200;
}

.nav-dropdown__panel a {
    display: block;
    padding: 0.8125rem var(--space-4);
    color: var(--color-navy);
    text-transform: capitalize;
    font-weight: 600;
    border-bottom: 1px solid rgba(16, 57, 68, 0.08);
    transition: background var(--duration-base) var(--ease-out), color var(--duration-base) var(--ease-out), padding-left var(--duration-base) var(--ease-out);
}

.nav-dropdown__panel a::after {
    display: none;
}

.nav-dropdown__panel a:hover,
.nav-dropdown__panel a:focus-visible {
    background: var(--color-ice);
    color: var(--color-teal);
    padding-left: 1.375rem;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    font-size: 1.75rem;
    color: var(--color-teal);
    cursor: pointer;
    background: none;
    border: none;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
}

.menu-toggle:focus-visible {
    box-shadow: var(--focus-ring);
}

/* Mobile navigation */
.mobile-nav {
    display: none;
    flex-direction: column;
    background: var(--color-navy);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav.is-open {
    display: block;
}

.mobile-nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav__list a {
    padding: 0.9375rem var(--space-5);
    text-decoration: none;
    color: var(--color-ice);
    text-transform: uppercase;
    font-size: var(--font-size-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    letter-spacing: 0.0625em;
    transition: background var(--duration-base) var(--ease-out), color var(--duration-base) var(--ease-out);
}

.mobile-nav__list a:hover,
.mobile-nav__list a:focus-visible {
    background: var(--color-deep-teal);
    color: var(--color-bright-teal);
}

.mobile-nav__exam-link {
    padding-left: 2.125rem;
    font-size: var(--font-size-xs);
    text-transform: capitalize;
    color: var(--color-on-dark);
}

/* Hero */
.hero {
    position: relative;
    min-height: 32.5rem;
    display: grid;
    place-items: center;
    padding: var(--space-10) var(--space-5);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    max-width: none;
    object-fit: cover !important;
    object-position: center center !important;
    z-index: 0;
}

.hero__cta {
    position: relative;
    z-index: 1;
}

.hero .btn-download {
    position: relative;
    overflow: hidden;
    z-index: 1;
    border-radius: 50px;
    border: none;
    background: transparent;
    color: #ffffff;
    box-shadow: none;
    transform: translateY(-70px) !important;
    transition: box-shadow var(--duration-base) var(--ease-out);
}

.hero .btn-download::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300%;
    height: 300%;
    background: conic-gradient(from 0deg, transparent 70%, #00ff88 100%);
    transform: translate(-50%, -50%) rotate(0deg);
    transform-origin: center center;
    z-index: -2;
    animation: spin-circular 2.5s linear infinite;
}

.hero .btn-download::after {
    content: "";
    position: absolute;
    inset: 3px;
    border-radius: 50px;
    background: #28a745;
    z-index: -1;
    transition: background var(--duration-base) var(--ease-out);
}

.hero .btn-download__label,
.hero .btn-download i {
    position: relative;
    z-index: 2;
}

.hero .btn-download:hover {
    background: transparent;
    color: #ffffff;
    transform: translateY(-70px) !important;
    box-shadow: none;
}

.hero .btn-download:hover::after {
    background: #218838;
}

.hero .btn-download:focus-visible {
    box-shadow: var(--focus-ring);
    transform: translateY(-70px) !important;
}

@keyframes spin-circular {
    0% {
        transform: translate(-50%, -50%) rotate(0deg);
    }

    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero .btn-download::before {
        animation: none;
        transform: translate(-50%, -50%) rotate(0deg);
    }
}

/* Exams list */
.exams-section {
    padding: 2.125rem var(--space-5) 3.5rem;
    text-align: center;
}

.exams-section__text {
    font-size: clamp(1.1875rem, 2.5vw, var(--font-size-xl));
    line-height: var(--line-height-base);
    color: var(--color-deep-teal);
    font-weight: 700;
    max-width: var(--container-narrow);
    margin: 0 auto;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
}

.exams-section__guides {
    margin-top: var(--space-6);
}

.exams-section__guides-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3) var(--space-5);
    list-style: none;
    margin: 0;
    padding: 0;
}

.exams-section__guides-list a {
    color: var(--color-teal);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--font-size-base);
}

.exams-section__guides-list a:hover,
.exams-section__guides-list a:focus-visible {
    color: var(--color-deep-teal);
    text-decoration: underline;
}

/* Contact / About combined section */
.contact-section {
    padding: var(--space-20) var(--space-5);
    background:
        radial-gradient(circle at top center, rgba(53, 184, 200, 0.18), transparent 34%),
        linear-gradient(135deg, var(--color-navy) 0%, var(--color-ink) 100%);
    color: var(--color-white);
    text-align: center;
    position: relative;
    overflow: hidden;
    scroll-margin-top: var(--header-sticky-offset);
}

.contact-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.04), transparent);
    pointer-events: none;
}

.contact-section .container {
    position: relative;
    z-index: 1;
}

.contact-about {
    margin-bottom: 4.875rem;
}

.contact-section .section-heading {
    color: var(--color-white);
}

.about-description {
    max-width: 58.125rem;
    margin: 2.125rem auto 3.25rem;
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-on-dark);
}

.about-description strong {
    color: var(--color-bright-teal);
}

/* Feature cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(16.25rem, 1fr));
    gap: var(--space-8);
    max-width: var(--container-max);
    margin: 0 auto;
}

.feature-card {
    background: rgba(255, 255, 255, 0.94);
    padding: var(--space-10) var(--space-6);
    border: 1px solid rgba(16, 57, 68, 0.08);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition:
        transform var(--duration-slow) var(--ease-out),
        box-shadow var(--duration-slow) var(--ease-out),
        border-color var(--duration-slow) var(--ease-out);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.feature-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    width: 100%;
    height: 0;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-deep-teal) 58%, var(--color-teal) 100%);
    transition: height var(--duration-slow) var(--ease-out);
    z-index: -1;
}

.feature-card:hover,
.feature-card:focus-within {
    transform: translateY(-0.9375rem);
    border-color: rgba(53, 184, 200, 0.45);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover::before,
.feature-card:focus-within::before {
    height: 100%;
}

.feature-card:hover .icon-box,
.feature-card:focus-within .icon-box {
    background: rgba(255, 255, 255, 0.14);
    color: var(--color-white);
}

.feature-card:hover h3,
.feature-card:hover p,
.feature-card:focus-within h3,
.feature-card:focus-within p {
    color: var(--color-white);
}

.icon-box {
    width: 4.375rem;
    height: 4.375rem;
    background: rgba(53, 184, 200, 0.12);
    color: var(--color-teal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto var(--space-5);
    transition: background var(--duration-slow) var(--ease-out), color var(--duration-slow) var(--ease-out);
}

.feature-card h3 {
    font-size: 1.375rem;
    margin-bottom: var(--space-4);
    color: var(--color-navy);
    transition: color var(--duration-slow) var(--ease-out);
}

.feature-card p {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-muted);
    transition: color var(--duration-slow) var(--ease-out);
}

/* Contact cards */
.contact-section .contact-heading {
    font-size: clamp(1.625rem, 3vw, var(--font-size-2xl));
    color: var(--color-white);
    margin-bottom: var(--space-5);
    font-weight: 800;
    position: relative;
    display: inline-block;
    letter-spacing: var(--letter-spacing-tight);
}

.contact-section .contact-heading::after {
    content: "";
    position: absolute;
    width: 4.25rem;
    height: 4px;
    background: linear-gradient(90deg, var(--color-bright-teal), var(--color-teal));
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    border-radius: var(--radius-pill);
}

.contact-description {
    max-width: 47.5rem;
    margin: 2.125rem auto 3.25rem;
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--color-on-dark);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(17.5rem, 1fr));
    gap: var(--space-8);
    max-width: 62.5rem;
    margin: 0 auto;
}

.contact-card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    padding: var(--space-10) var(--space-8);
    border-radius: var(--radius-lg);
    transition:
        transform var(--duration-slow) var(--ease-out),
        background var(--duration-slow) var(--ease-out),
        box-shadow var(--duration-slow) var(--ease-out),
        border-color var(--duration-slow) var(--ease-out);
}

.contact-card:hover,
.contact-card:focus-within {
    transform: translateY(-0.625rem);
    background: rgba(255, 255, 255, 0.11);
    border-color: rgba(53, 184, 200, 0.45);
    box-shadow: 0 1.125rem 2.25rem rgba(0, 0, 0, 0.32);
}

.contact-icon {
    width: 3.75rem;
    height: 3.75rem;
    background: linear-gradient(135deg, var(--color-bright-teal), var(--color-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-white);
    margin: 0 auto var(--space-5);
    box-shadow: 0 0 0.9375rem rgba(53, 184, 200, 0.42);
}

@media (prefers-reduced-motion: no-preference) {
    .contact-icon {
        animation: pulse 2s infinite;
    }
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(53, 184, 200, 0.7); }
    70% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(53, 184, 200, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(53, 184, 200, 0); }
}

.contact-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-4);
    color: var(--color-white);
}

.contact-card p,
.contact-card a {
    font-size: var(--font-size-base);
    line-height: 1.65;
    color: var(--color-on-dark);
    text-decoration: none;
    transition: color var(--duration-base) var(--ease-out);
}

.contact-card a:hover,
.contact-card a:focus-visible {
    color: var(--color-bright-teal);
}

/* Site footer */
.site-footer {
    background: var(--color-ink);
    color: var(--color-steel);
    text-align: center;
    padding: var(--space-6) var(--space-5);
    font-size: var(--font-size-sm);
}

.site-footer a {
    color: var(--color-bright-teal);
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 48rem) {
    .site-header {
        padding: 0.9375rem var(--space-5);
    }

    .primary-nav {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .hero {
        min-height: 23.75rem;
    }

    .hero .btn-download,
    .hero .btn-download:hover,
    .hero .btn-download:focus-visible {
        transform: translateY(-70px) !important;
    }

    .btn-download {
        font-size: var(--font-size-md);
        padding: 1.0625rem var(--space-6);
    }

    .about-description {
        font-size: var(--font-size-base);
        margin-bottom: 2.375rem;
    }

    .contact-section {
        padding: 4.125rem var(--space-4);
        scroll-margin-top: 5.125rem;
    }

    .contact-about {
        margin-bottom: 3.625rem;
    }

    .contact-description {
        font-size: var(--font-size-base);
        margin-bottom: 2.375rem;
    }
}

@media (max-width: 30rem) {
    .utility-bar {
        gap: var(--space-3);
        font-size: var(--font-size-xs);
    }

    .site-logo {
        font-size: 1.3125rem;
    }

    .hero {
        min-height: 20rem;
    }

    .btn-download {
        font-size: var(--font-size-base);
        padding: 0.9375rem var(--space-5);
    }

    .feature-card {
        padding: var(--space-8) 1.375rem;
    }

    .contact-card {
        padding: var(--space-8) 1.375rem;
    }
}