/*
Theme Name: Oopbuy Spreadsheet SEO
Theme URI: https://sheetfinds.com/
Author: Sheetfinds
Author URI: https://sheetfinds.com/
Description: A clean, light, SEO-optimized WordPress theme built around the Oopbuy Spreadsheet topic. Includes a dropdown category navigation, call-to-action buttons that point to sheetfinds.com, and 10 pre-written SEO articles with full internal linking.
Version: 1.0.0
Tested up to: 6.5
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: oopbuy-seo
Tags: blog, one-column, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ============================================================
   RESET & BASE
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    color: #1f2937;
    background: #e8f4fc;
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: #2563eb;
    text-decoration: none;
    transition: color .2s ease;
}
a:hover { color: #1d4ed8; text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
    color: #0f172a;
    line-height: 1.25;
    margin: 0 0 .6em;
    font-weight: 700;
    letter-spacing: -0.01em;
}
h1 { font-size: 2.4rem; }
h2 { font-size: 1.85rem; }
h3 { font-size: 1.35rem; }

p { margin: 0 0 1.1em; }

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(8px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
    gap: 24px;
}

.site-logo a {
    font-size: 1.4rem;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -0.02em;
    text-decoration: none;
}
.site-logo span { color: #2563eb; }

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.site-nav a {
    color: #334155;
    font-weight: 500;
    font-size: 0.95rem;
}
.site-nav a:hover { color: #2563eb; text-decoration: none; }

/* Dropdown */
.dropdown {
    position: relative;
}
.dropdown__toggle {
    background: none;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 8px 14px;
    cursor: pointer;
    font-size: 0.95rem;
    color: #334155;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all .2s ease;
    font-family: inherit;
}
.dropdown__toggle:hover { border-color: #2563eb; color: #2563eb; }
.dropdown__toggle::after {
    content: "";
    width: 8px; height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    margin-top: -3px;
    transition: transform .2s ease;
}
.dropdown.is-open .dropdown__toggle::after { transform: rotate(-135deg); margin-top: 3px; }

.dropdown__menu {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 240px;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, .08);
    padding: 8px;
    display: none;
    max-height: 70vh;
    overflow-y: auto;
}
.dropdown.is-open .dropdown__menu { display: block; }

.dropdown__menu a {
    display: block;
    padding: 10px 14px;
    color: #334155;
    border-radius: 8px;
    font-size: 0.95rem;
    text-decoration: none;
}
.dropdown__menu a:hover { background: #f1f5f9; color: #2563eb; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.98rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .2s ease;
    text-decoration: none;
    line-height: 1.2;
    font-family: inherit;
}

.btn--primary {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(37, 99, 235, .25);
}
.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, .35);
    color: #fff;
    text-decoration: none;
}

.btn--secondary {
    background: #ffffff;
    color: #2563eb;
    border-color: #dbeafe;
}
.btn--secondary:hover {
    background: #eff6ff;
    border-color: #2563eb;
    text-decoration: none;
}

.btn--ghost {
    background: transparent;
    color: #334155;
    border-color: #e5e7eb;
}
.btn--ghost:hover { background: #f8fafc; color: #2563eb; text-decoration: none; }

.btn--lg { padding: 14px 28px; font-size: 1.05rem; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
    background:
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, .18), transparent 45%),
        radial-gradient(circle at 90% 80%, rgba(14, 165, 233, .14), transparent 45%),
        linear-gradient(180deg, #f5fbff 0%, #d6ecfa 100%);
    padding: 90px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    margin-bottom: 18px;
    background: linear-gradient(135deg, #0f172a 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p.lead {
    font-size: 1.15rem;
    color: #475569;
    max-width: 680px;
    margin: 0 auto 32px;
}

.hero__cta {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.hero__badge {
    display: inline-block;
    background: #eff6ff;
    color: #1d4ed8;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 18px;
    letter-spacing: 0.02em;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
    padding: 70px 0;
}
.section--alt { background: #ffffff; }

.section__header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 48px;
}
.section__header p { color: #64748b; font-size: 1.05rem; }

/* ============================================================
   CATEGORY GRID
   ============================================================ */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.cat-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    color: #0f172a;
    font-weight: 600;
    text-decoration: none;
    transition: all .25s ease;
    position: relative;
    overflow: hidden;
}
.cat-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, .04), rgba(14, 165, 233, .04));
    opacity: 0;
    transition: opacity .25s ease;
}
.cat-card:hover {
    border-color: #2563eb;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(15, 23, 42, .08);
    text-decoration: none;
    color: #1d4ed8;
}
.cat-card:hover::before { opacity: 1; }

.cat-card__icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #1d4ed8;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}
.cat-card__icon svg { display: block; width: 24px; height: 24px; }
.cat-card__label { position: relative; z-index: 1; }

/* ============================================================
   ARTICLES GRID
   ============================================================ */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.article-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    overflow: hidden;
    transition: all .25s ease;
    display: flex;
    flex-direction: column;
}
.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 32px rgba(15, 23, 42, .08);
    border-color: #cbd5e1;
}

.article-card__cover {
    height: 160px;
    background: linear-gradient(135deg, #dbeafe 0%, #e0f2fe 50%, #f0f9ff 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1d4ed8;
    position: relative;
}
.article-card__cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.5), transparent 50%);
}
.article-card__icon-wrap {
    width: 84px;
    height: 84px;
    border-radius: 50%;
    background: #ffffff;
    color: #1d4ed8;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 18px rgba(29, 78, 216, 0.18);
    position: relative;
    z-index: 1;
}
.article-card__icon-wrap svg { display: block; width: 40px; height: 40px; }

.article-card__body {
    padding: 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card__tag {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #2563eb;
    margin-bottom: 10px;
}

.article-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: #0f172a;
}

.article-card p {
    color: #64748b;
    font-size: 0.95rem;
    flex: 1;
    margin-bottom: 16px;
}

.article-card__link {
    color: #2563eb;
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
}
.article-card__link:hover { color: #1d4ed8; gap: 8px; text-decoration: none; }

/* ============================================================
   CTA BANNER
   ============================================================ */
.cta-banner {
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #0ea5e9 100%);
    color: #fff;
    border-radius: 24px;
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(255,255,255,.12), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,.1), transparent 50%);
}
.cta-banner > * { position: relative; z-index: 1; }
.cta-banner h2 { color: #fff; font-size: 2.1rem; margin-bottom: 14px; }
.cta-banner p { color: #dbeafe; font-size: 1.1rem; max-width: 620px; margin: 0 auto 28px; }
.cta-banner .btn--primary {
    background: #fff;
    color: #1d4ed8;
}
.cta-banner .btn--primary:hover {
    background: #f1f5f9;
    color: #1e3a8a;
}
.cta-banner .btn--secondary {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,.4);
}
.cta-banner .btn--secondary:hover {
    background: rgba(255,255,255,.1);
    border-color: #fff;
    color: #fff;
}

/* ============================================================
   FEATURE LIST
   ============================================================ */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}
.feature {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    padding: 28px;
    transition: all .25s ease;
}
.feature:hover {
    border-color: #cbd5e1;
    box-shadow: 0 8px 20px rgba(15, 23, 42, .06);
}
.feature__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #1d4ed8;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.feature__icon svg { display: block; width: 22px; height: 22px; }
.feature h3 { font-size: 1.15rem; margin-bottom: 8px; }
.feature p { color: #64748b; margin: 0; font-size: 0.95rem; }

/* ============================================================
   ARTICLE / PAGE BODY
   ============================================================ */
.entry {
    background: #ffffff;
    border-radius: 20px;
    padding: 56px;
    margin: 40px 0 60px;
    box-shadow: 0 4px 24px rgba(15, 23, 42, .04);
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.entry__meta {
    display: flex;
    gap: 12px;
    align-items: center;
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 16px;
}
.entry__meta .tag {
    background: #eff6ff;
    color: #1d4ed8;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.entry h1 { font-size: 2.4rem; margin-bottom: 20px; }
.entry h2 { font-size: 1.6rem; margin: 40px 0 14px; }
.entry h3 { font-size: 1.2rem; margin: 28px 0 10px; }
.entry p, .entry li { color: #334155; }
.entry ul, .entry ol { padding-left: 22px; margin: 0 0 1.4em; }
.entry li { margin-bottom: .5em; }
.entry strong { color: #0f172a; }
.entry blockquote {
    border-left: 4px solid #2563eb;
    padding: 14px 22px;
    background: #f8fafc;
    border-radius: 0 12px 12px 0;
    margin: 24px 0;
    color: #334155;
    font-style: italic;
}

.entry .inline-cta {
    background: linear-gradient(135deg, #eff6ff, #f0f9ff);
    border: 1px solid #dbeafe;
    border-radius: 14px;
    padding: 22px 26px;
    margin: 30px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.entry .inline-cta p { margin: 0; font-weight: 600; color: #1e3a8a; }

.related-articles {
    border-top: 1px solid #e5e7eb;
    margin-top: 50px;
    padding-top: 30px;
}
.related-articles h3 { font-size: 1.2rem; margin-bottom: 16px; }
.related-articles ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
}
.related-articles li { margin: 0; }
.related-articles a {
    display: block;
    padding: 14px 18px;
    background: #f8fafc;
    border-radius: 10px;
    color: #334155;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all .2s ease;
    text-decoration: none;
}
.related-articles a:hover {
    background: #eff6ff;
    color: #2563eb;
    text-decoration: none;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 60px 0 24px;
    margin-top: 80px;
}
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: #fff; }

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 8px; font-size: 0.95rem; }
.footer-col p { color: #94a3b8; font-size: 0.95rem; }

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 22px;
    text-align: center;
    color: #64748b;
    font-size: 0.9rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
    .entry { padding: 32px 22px; }
    .hero { padding: 60px 0 50px; }
    .section { padding: 50px 0; }
    .cta-banner { padding: 40px 22px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    h1 { font-size: 1.9rem; }
    h2 { font-size: 1.5rem; }
}

@media (max-width: 640px) {
    .site-nav { gap: 12px; }
    .site-nav a:not(.btn) { display: none; }
    .hero h1 { font-size: 1.8rem; }
    .hero p.lead { font-size: 1rem; }
    .btn { padding: 10px 18px; font-size: 0.95rem; }
}