/* =========================================================
   NexaMobile - Shared Stylesheet
   Modern, responsive, and accessible UI for all pages.
========================================================= */

:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-alt: #eef3fb;
    --text: #0f172a;
    --text-soft: #475569;
    --border: #d9e2f1;
    --brand: #0b5cff;
    --brand-2: #00b8d9;
    --accent: #ff7a18;
    --success: #0f9f6e;
    --danger: #dc2626;
    --shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    --radius-lg: 1.2rem;
    --radius-md: 0.8rem;
    --radius-sm: 0.5rem;
    --container: min(1160px, 92%);
    --header-height: 84px;
    --speed: 220ms ease;
}

body.dark {
    --bg: #081126;
    --surface: #101d35;
    --surface-alt: #162743;
    --text: #eef4ff;
    --text-soft: #b8cae8;
    --border: #294465;
    --brand: #4f8dff;
    --brand-2: #29d3f7;
    --accent: #ff9952;
    --shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "DM Sans", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 10% 8%, rgba(11, 92, 255, 0.14), transparent 30%),
        radial-gradient(circle at 92% 2%, rgba(0, 184, 217, 0.14), transparent 25%),
        var(--bg);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    width: var(--container);
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: -999px;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
    background: var(--surface);
    color: var(--text);
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    z-index: 999;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--surface) 87%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
    min-height: var(--header-height);
}

.nav-wrap {
    min-height: var(--header-height);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem;
}

.header-tools {
    justify-self: end;
    width: min(430px, 100%);
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.brand {
    font-family: "Sora", sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.2px;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.brand-mark {
    width: 1.7rem;
    aspect-ratio: 1;
    border-radius: 0.45rem;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    box-shadow: 0 10px 20px rgba(11, 92, 255, 0.26);
}

.search-form {
    width: 100%;
    max-width: 360px;
    position: relative;
}

.header-tools .search-form {
    max-width: none;
}

.search-form input {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--surface-alt);
    color: var(--text);
    border-radius: 999px;
    padding: 0.6rem 2.5rem 0.6rem 1rem;
    font-size: 0.95rem;
}

.search-form button {
    position: absolute;
    right: 0.35rem;
    top: 50%;
    transform: translateY(-50%);
    border: none;
    background: var(--brand);
    color: #fff;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.nav-menu a {
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.35rem 0.35rem;
    border-radius: 0.4rem;
    transition: color var(--speed), background-color var(--speed);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--brand);
    background: color-mix(in srgb, var(--brand) 12%, transparent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-left: 0.4rem;
}

.icon-btn {
    border: 1px solid var(--border);
    width: 2.3rem;
    height: 2.3rem;
    border-radius: 999px;
    background: var(--surface-alt);
    color: var(--text);
    cursor: pointer;
    display: grid;
    place-items: center;
    position: relative;
}

.icon-btn:hover {
    border-color: var(--brand);
    color: var(--brand);
}

.cart-badge {
    position: absolute;
    top: -0.2rem;
    right: -0.2rem;
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-size: 0.72rem;
    display: grid;
    place-items: center;
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 0.22rem;
}

.hamburger span {
    width: 1.2rem;
    height: 2px;
    background: currentColor;
    transition: transform var(--speed), opacity var(--speed);
}

body.nav-open .hamburger span:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}

body.nav-open .hamburger span:nth-child(2) {
    opacity: 0;
}

body.nav-open .hamburger span:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
}

.hero {
    padding: 3.4rem 0 2.6rem;
    position: relative;
    overflow: clip;
}

.hero-grid {
    display: grid;
    gap: 1.5rem;
    align-items: center;
    grid-template-columns: 1.15fr 1fr;
}

.hero-copy h1 {
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.08;
    font-family: "Sora", sans-serif;
    margin-bottom: 1rem;
}

.hero-copy p {
    color: var(--text-soft);
    max-width: 56ch;
    margin-bottom: 1.4rem;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 0.7rem 1.3rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--speed), box-shadow var(--speed), background var(--speed);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(120deg, var(--brand), var(--brand-2));
    box-shadow: 0 10px 24px rgba(11, 92, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 32px rgba(11, 92, 255, 0.34);
}

.btn-secondary {
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--brand);
}

.hero-carousel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 0.75rem;
    position: relative;
}

.slides {
    overflow: hidden;
    border-radius: calc(var(--radius-lg) - 0.3rem);
    aspect-ratio: 16 / 10;
    position: relative;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transform: translateX(18px);
    transition: opacity 450ms ease, transform 450ms ease;
}

.slide.active {
    opacity: 1;
    transform: translateX(0);
}

.slide img {
    height: 100%;
    object-fit: cover;
}

.slide-caption {
    position: absolute;
    left: 0.9rem;
    bottom: 0.9rem;
    background: color-mix(in srgb, #000 50%, transparent);
    color: #fff;
    border-radius: 0.6rem;
    padding: 0.45rem 0.65rem;
    font-size: 0.9rem;
}

.carousel-controls {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    margin-top: 0.7rem;
}

.carousel-dot {
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 999px;
    border: none;
    background: color-mix(in srgb, var(--text) 20%, transparent);
    cursor: pointer;
}

.carousel-dot.active {
    background: var(--brand);
}

.stats {
    padding-bottom: 2.4rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    text-align: center;
}

.stat-card strong {
    display: block;
    font-family: "Sora", sans-serif;
    font-size: 1.35rem;
    margin-bottom: 0.2rem;
}

.section {
    padding: 2.8rem 0;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 0.75rem;
    margin-bottom: 1.35rem;
}

.section-head h2 {
    font-family: "Sora", sans-serif;
    font-size: clamp(1.4rem, 2.4vw, 2rem);
    margin-bottom: 0.25rem;
}

.section-head p {
    color: var(--text-soft);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.6rem;
    background: color-mix(in srgb, var(--brand) 13%, transparent);
    color: var(--brand);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.phone-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    box-shadow: 0 10px 18px rgba(15, 23, 42, 0.06);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    transition: transform var(--speed), box-shadow var(--speed);
}

.phone-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.phone-media {
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: var(--surface-alt);
}

.phone-media img {
    height: 100%;
    object-fit: cover;
    transition: transform 500ms ease;
}

.phone-card:hover .phone-media img {
    transform: scale(1.05);
}

.phone-content {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.phone-title {
    font-family: "Sora", sans-serif;
    font-size: 1rem;
}

.phone-specs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.pill {
    font-size: 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    padding: 0.2rem 0.5rem;
    color: var(--text-soft);
}

.price {
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 0.2rem;
}

.card-actions {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    margin-top: auto;
}

.ghost-link {
    font-size: 0.9rem;
    color: var(--brand);
    font-weight: 600;
}

.filter-row {
    display: flex;
    gap: 0.55rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.filter-btn {
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text);
    padding: 0.5rem 0.9rem;
    cursor: pointer;
    font-size: 0.9rem;
}

.filter-btn.active,
.filter-btn:hover {
    border-color: var(--brand);
    color: var(--brand);
}

.highlight-panel {
    background: linear-gradient(130deg, color-mix(in srgb, var(--brand) 14%, var(--surface)), var(--surface));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.4rem;
}

.compare-wrap {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1rem;
    align-items: start;
}

.compare-controls {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    position: sticky;
    top: calc(var(--header-height) + 0.75rem);
}

.compare-controls label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
    font-weight: 600;
}

.compare-controls select {
    width: 100%;
    margin-bottom: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background: var(--surface-alt);
    color: var(--text);
    padding: 0.55rem;
}

.compare-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
}

.compare-table th,
.compare-table td {
    border-bottom: 1px solid var(--border);
    padding: 0.75rem;
    text-align: left;
    vertical-align: top;
}

.compare-table th {
    background: color-mix(in srgb, var(--brand) 12%, var(--surface));
    font-family: "Sora", sans-serif;
}

.deals-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.deal-card {
    border-radius: var(--radius-md);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
    overflow: hidden;
}

.deal-content {
    padding: 1rem;
}

.ribbon {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    border-radius: 999px;
    padding: 0.25rem 0.55rem;
    font-size: 0.78rem;
}

.media-stack {
    position: relative;
    overflow: hidden;
}

.media-stack img {
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.parallax {
    background-image:
        linear-gradient(120deg, rgba(8, 17, 38, 0.66), rgba(11, 92, 255, 0.45)),
        url("https://images.unsplash.com/photo-1511707171634-5f897ff02aa9?auto=format&fit=crop&w=1600&q=80");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 2.6rem 1.4rem;
    text-align: center;
}

.testimonials {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
}

.testimonial {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.testimonial p {
    color: var(--text-soft);
}

.newsletter {
    background: linear-gradient(135deg, color-mix(in srgb, var(--brand) 20%, var(--surface)), var(--surface));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.4rem;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.newsletter form {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.newsletter input {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.6rem 0.95rem;
    min-width: 220px;
    background: var(--surface);
    color: var(--text);
}

.list-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.surface-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.1rem;
}

.surface-card ul {
    list-style: disc;
    padding-left: 1.2rem;
}

.surface-card ol {
    list-style: decimal;
    padding-left: 1.2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-card,
.info-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.form-group {
    margin-bottom: 0.8rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 0.55rem;
    padding: 0.65rem;
    background: var(--surface-alt);
    color: var(--text);
    font-family: inherit;
}

.form-group textarea {
    min-height: 130px;
    resize: vertical;
}

.error-msg {
    color: var(--danger);
    font-size: 0.82rem;
    margin-top: 0.2rem;
}

.success-msg {
    color: var(--success);
    font-size: 0.88rem;
    margin-top: 0.3rem;
}

.site-footer {
    margin-top: 2.4rem;
    border-top: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
}

.footer-grid {
    padding: 2rem 0 1.2rem;
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
    gap: 1rem;
}

.footer-col h3 {
    font-family: "Sora", sans-serif;
    font-size: 1rem;
    margin-bottom: 0.45rem;
}

.footer-col a {
    display: inline-block;
    margin: 0.2rem 0;
    color: var(--text-soft);
}

.footer-col a:hover {
    color: var(--brand);
}

.footer-note {
    border-top: 1px solid var(--border);
    padding: 0.8rem 0;
    display: flex;
    justify-content: space-between;
    gap: 0.8rem;
    flex-wrap: wrap;
    font-size: 0.88rem;
    color: var(--text-soft);
}

.reveal {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.show {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    border: none;
    width: 2.7rem;
    height: 2.7rem;
    border-radius: 999px;
    background: linear-gradient(120deg, var(--brand), var(--brand-2));
    color: #fff;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 20px rgba(11, 92, 255, 0.35);
    cursor: pointer;
}

.back-to-top.show {
    display: inline-flex;
}

.float-chip {
    position: fixed;
    z-index: 140;
    pointer-events: none;
    width: 0.85rem;
    aspect-ratio: 1;
    border-radius: 999px;
    background: var(--accent);
    box-shadow: 0 0 0 7px color-mix(in srgb, var(--accent) 20%, transparent);
}

/* Mobile and tablet adjustments */
@media (max-width: 1080px) {
    .card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.1fr 1fr 1fr;
    }
}

@media (max-width: 900px) {
    .hero-grid,
    .compare-wrap,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .compare-controls {
        position: static;
    }

    .testimonials,
    .deals-grid,
    .card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .parallax {
        background-attachment: scroll;
    }
}

@media (max-width: 760px) {
    .nav-wrap {
        grid-template-columns: auto auto;
    }

    .header-tools {
        grid-column: 1 / -1;
        width: 100%;
        justify-self: stretch;
    }

    .search-form {
        margin-top: 0.4rem;
    }

    .hamburger {
        display: inline-flex;
        justify-self: end;
    }

    .nav-menu {
        position: fixed;
        inset: var(--header-height) 0 auto 0;
        background: color-mix(in srgb, var(--surface) 96%, transparent);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
        transform: translateY(-120%);
        transition: transform var(--speed);
    }

    body.nav-open .nav-menu {
        transform: translateY(0);
    }

    .nav-actions {
        margin-left: 0;
    }

    .list-grid,
    .testimonials,
    .deals-grid,
    .card-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 2.2rem 0;
    }

    .hero {
        padding-top: 2.2rem;
    }
}