/* ===== Erixpack Landing — mobile-first ===== */
:root {
    --primary: #1557d4;
    --primary-dark: #0b1e3a;
    --primary-light: #e8f0fd;
    --accent: #f08c1e;
    --accent-dark: #d97706;
    --ink: #16233a;
    --muted: #54657e;
    --bg: #ffffff;
    --bg-alt: #f4f8fd;
    --border: #d9e4f5;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(11, 30, 58, .10);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Hind Siliguri', 'Noto Sans Bengali', sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 18px;
}

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

a { color: var(--primary); text-decoration: none; }

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    font-family: inherit;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    text-align: center;
    transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 6px 18px rgba(240, 140, 30, .35);
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }

.btn-light {
    background: #fff;
    color: var(--primary-dark);
}
.btn-light:hover { background: var(--primary-light); }

.btn-sm  { padding: 8px 16px;  font-size: .9rem; }
.btn-lg  { padding: 14px 30px; font-size: 1.1rem; }
.btn-block { width: 100%; }

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 10px;
    padding-bottom: 10px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    object-fit: cover;
    border: 1px solid var(--border);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: .3px;
}
.brand-tag { font-size: .72rem; color: var(--muted); }
.header-cta { white-space: nowrap; }

/* ===== Hero ===== */
.hero {
    background: linear-gradient(160deg, var(--primary-light) 0%, #fff 70%);
    padding: 44px 0 40px;
}
.hero-copy h1 {
    font-size: 1.9rem;
    line-height: 1.3;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 14px;
}
.hero-sub {
    font-size: 1.05rem;
    color: var(--muted);
    margin-bottom: 22px;
}
.hero-facts {
    list-style: none;
    display: grid;
    gap: 10px;
    margin-bottom: 26px;
}
.hero-facts li {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: 4px 10px;
    box-shadow: 0 2px 8px rgba(11,30,58,.06);
}
.fact-label { color: var(--muted); font-size: .9rem; }
.fact-value { font-weight: 700; color: var(--primary-dark); }
.hero-media { margin-top: 30px; }
.hero-img {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.size-media img {
    max-width: 230px;
    margin: 0 auto 14px;
    border-radius: 12px;
}

/* ===== Sections ===== */
.section { padding: 52px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--primary-dark);
    text-align: center;
    margin-bottom: 12px;
    line-height: 1.35;
}
.section-sub {
    text-align: center;
    color: var(--muted);
    max-width: 640px;
    margin: 0 auto 30px;
}

/* ===== Product ===== */
.size-grid {
    display: grid;
    gap: 18px;
    margin-bottom: 22px;
}
.size-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow);
}
.size-card h3 {
    font-size: 1.4rem;
    color: var(--primary);
    margin-bottom: 6px;
}
.size-card p { color: var(--muted); font-size: .95rem; }

.info-cards { display: grid; gap: 14px; }
.info-card {
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}
.info-card h4 { font-size: .95rem; font-weight: 600; opacity: .9; margin-bottom: 4px; }
.info-card p { font-size: .95rem; opacity: .95; }
.info-big { font-size: 1.8rem; font-weight: 700; }

/* ===== Audience ===== */
.audience-grid {
    display: grid;
    gap: 12px;
    max-width: 720px;
    margin: 0 auto;
}
.audience-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}
.aud-icon { font-size: 1.4rem; line-height: 1; }

/* ===== Form ===== */
.form-wrap { max-width: 680px; margin: 0 auto; }
.form-note-box {
    background: #fff8ed;
    border: 1px solid #f3ddba;
    border-radius: var(--radius);
    padding: 10px 14px;
    font-size: .9rem;
    margin: 0 auto 20px;
    max-width: 560px;
}
.inquiry-form {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 14px;
    box-shadow: var(--shadow);
}
.form-errors {
    background: #fdf0ee;
    border: 1px solid #f2c4bc;
    color: #a33b2a;
    border-radius: 10px;
    padding: 10px 14px;
    margin-bottom: 14px;
    font-size: .88rem;
}
.form-errors ul { margin: 6px 0 0 18px; }

.field { margin-bottom: 12px; }
.field label, .field-label {
    display: block;
    font-weight: 600;
    font-size: .87rem;
    margin-bottom: 4px;
}
.req { color: #d33; }
.opt { color: var(--muted); font-weight: 400; font-size: .8rem; }
.field input[type="text"],
.field input[type="tel"],
.field input[type="email"],
.field select,
.field textarea {
    width: 100%;
    font-family: inherit;
    font-size: .92rem;
    color: var(--ink);
    background: #fbfdfc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 9px 12px;
    transition: border-color .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
}
.field textarea { resize: vertical; }

.radio-group { display: flex; flex-wrap: wrap; gap: 8px; }
.radio-chip input { position: absolute; opacity: 0; pointer-events: none; }
.radio-chip span {
    display: inline-block;
    padding: 7px 16px;
    font-size: .88rem;
    border: 1.5px solid var(--border);
    border-radius: 30px;
    background: #fbfdfc;
    font-weight: 600;
    cursor: pointer;
    transition: all .15s ease;
}
.radio-chip input:checked + span {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.radio-chip input:focus-visible + span { outline: 2px solid var(--primary); outline-offset: 2px; }

.form-note {
    font-size: .82rem;
    color: var(--muted);
    text-align: center;
    margin-bottom: 10px;
}

/* ===== FAQ ===== */
.faq-wrap { max-width: 720px; }
.faq-list { display: grid; gap: 10px; }
.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 16px 48px 16px 18px;
    font-weight: 600;
    position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 18px; top: 50%;
    transform: translateY(-50%);
    font-size: 1.4rem;
    color: var(--primary);
    transition: transform .2s ease;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item p {
    padding: 0 18px 16px;
    color: var(--muted);
    border-top: 1px dashed var(--border);
    padding-top: 12px;
    margin: 0 18px 16px;
    padding-left: 0; padding-right: 0;
}

/* ===== Final CTA ===== */
.final-cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    text-align: center;
    padding: 56px 0 84px;
}
.final-cta h2 { font-size: 1.6rem; margin-bottom: 10px; line-height: 1.35; }
.final-cta p { opacity: .9; margin-bottom: 24px; }

/* ===== Footer ===== */
.site-footer { background: #0b1e3a; color: #c5d5ee; }
.footer-grid {
    display: grid;
    gap: 26px;
    padding-top: 44px;
    padding-bottom: 34px;
}
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-tag { color: #8ea9d4; }
.footer-brand p { margin-top: 10px; font-size: .9rem; color: #9cb4d9; }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 10px; }
.footer-contact a { color: #c5d5ee; }
.footer-contact a:hover { color: #fff; }
.social-links { display: flex; gap: 12px; }
.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px; height: 42px;
    border-radius: 50%;
    background: rgba(255,255,255,.08);
    color: #c5d5ee;
    transition: background .15s ease;
}
.social-links a:hover { background: var(--primary); color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding: 16px 0;
    font-size: .85rem;
    color: #8ea9d4;
    text-align: center;
}

/* ===== Tablet & up ===== */
@media (min-width: 640px) {
    .hero-copy h1 { font-size: 2.4rem; }
    .size-grid { grid-template-columns: 1fr 1fr; }
    .info-cards { grid-template-columns: 1fr 1fr; }
    .audience-grid { grid-template-columns: 1fr 1fr; }
    .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .inquiry-form { padding: 24px; }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}

@media (min-width: 900px) {
    .hero { padding: 70px 0; }
    .hero-grid {
        display: grid;
        grid-template-columns: 1.1fr .9fr;
        gap: 40px;
        align-items: center;
    }
    .hero-media { margin-top: 0; }
    .section { padding: 72px 0; }
    .section-title { font-size: 1.9rem; }
    .audience-grid { grid-template-columns: repeat(2, 1fr); }
    .final-cta h2 { font-size: 2rem; }
    .final-cta { padding-bottom: 64px; }
}

@media (min-width: 1100px) {
    .audience-grid { grid-template-columns: repeat(3, 1fr); }
    .audience-item:last-child { grid-column: 1 / -1; max-width: 340px; margin: 0 auto; width: 100%; }
}

/* ===== Mobile compaction ===== */
@media (max-width: 639px) {
    .header-cta { padding: 6px 10px; font-size: .76rem; border-radius: 8px; }
    .brand-logo { width: 38px; height: 38px; }

    .section { padding: 36px 0; }
    .section-title { font-size: 1.3rem; margin-bottom: 8px; }
    .section-sub { font-size: .88rem; margin-bottom: 18px; }

    .hero { padding: 30px 0 28px; }
    .hero-copy h1 { font-size: 1.55rem; }
    .hero-sub { font-size: .95rem; margin-bottom: 16px; }
    .hero-facts { gap: 8px; margin-bottom: 20px; }
    .hero-facts li { padding: 9px 12px; font-size: .9rem; }
    .hero-media { margin-top: 20px; }

    .size-grid { gap: 12px; }
    .size-card { padding: 16px 14px; }
    .size-media img { max-width: 180px; margin-bottom: 8px; }
    .info-cards { gap: 10px; }
    .info-card { padding: 14px; }
    .info-big { font-size: 1.5rem; }

    .audience-grid { gap: 8px; }
    .audience-item { padding: 10px 14px; font-size: .9rem; gap: 10px; }
    .aud-icon { font-size: 1.15rem; }

    .form-note-box { padding: 8px 12px; font-size: .82rem; margin-bottom: 16px; }
    .inquiry-form { padding: 14px 12px; }
    .field { margin-bottom: 9px; }
    .field label, .field-label { font-size: .82rem; margin-bottom: 3px; }
    .field input[type="text"],
    .field input[type="tel"],
    .field input[type="email"],
    .field select,
    .field textarea {
        padding: 7px 10px;
        font-size: .88rem;
        border-radius: 7px;
    }
    .radio-group { gap: 6px; }
    .radio-chip span { padding: 6px 13px; font-size: .82rem; }
    .form-note { font-size: .78rem; margin-bottom: 8px; }
    .btn-lg { padding: 12px 24px; font-size: 1rem; }

    .faq-list { gap: 8px; }
    .faq-item summary { padding: 12px 44px 12px 14px; font-size: .92rem; }
    .faq-item p { padding-top: 10px; margin: 0 14px 12px; font-size: .9rem; }

    .final-cta { padding: 40px 0 72px; }
    .final-cta h2 { font-size: 1.35rem; }
    .final-cta p { font-size: .92rem; margin-bottom: 18px; }

    .footer-grid { gap: 20px; padding-top: 34px; padding-bottom: 26px; }
}