/* ========================================
   CowTech Shared Components
   P3 step 1: extracted from style.css
   Contains: nav, buttons, sections, cards, layouts
   ======================================== */

/* ── Navigation ── */
nav {
    position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height);
    background: rgba(255, 255, 255, 0.80);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 32px;
}

nav .nav-inner {
    width: 100%;
    max-width: var(--content-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

nav .nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 18px;
}

nav .nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}

nav .nav-links a {
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.18s ease;
    white-space: nowrap;
}
nav .nav-links a:hover { color: var(--brand-blue); }

nav .nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 38px;
    padding: 0 18px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-dark);
    border: 1px solid rgba(0, 0, 0, 0.10);
    background: var(--white);
    transition: all 0.18s ease;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
}
nav .nav-cta:hover {
    border-color: var(--text-dark);
    color: var(--text-dark);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.10);
}

nav .nav-cta-primary {
    background: var(--text-dark);
    color: var(--white);
    border-color: var(--text-dark);
}
nav .nav-cta-primary:hover {
    background: var(--brand-blue);
    border-color: var(--brand-blue);
    color: var(--white);
}

nav .nav-hamburger {
    display: none;
    background: transparent;
    border: 0;
    width: 40px;
    height: 40px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}
nav .nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-dark);
    position: relative;
}
nav .nav-hamburger span::before,
nav .nav-hamburger span::after {
    content: '';
    position: absolute;
    left: 0; width: 22px; height: 2px;
    background: var(--text-dark);
}
nav .nav-hamburger span::before { top: -7px; }
nav .nav-hamburger span::after  { top: 7px; }

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border-light);
    padding: 16px 24px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 16px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
    color: var(--text-dark);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
}
.mobile-nav a:last-child { border-bottom: 0; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 24px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.18s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--brand-blue);
    color: var(--white);
    border-color: var(--brand-blue);
    box-shadow: 0 12px 28px rgba(20, 86, 240, 0.20);
}
.btn-primary:hover {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--text-dark);
    border-color: rgba(0, 0, 0, 0.12);
}
.btn-secondary:hover {
    border-color: var(--text-dark);
}

.btn-accent {
    background: linear-gradient(135deg, var(--brand-blue), var(--geo-green));
    color: var(--white);
    border: 0;
}
.btn-accent:hover {
    filter: brightness(1.06);
    color: var(--white);
}

.btn-ghost {
    background: transparent;
    color: var(--text-dark);
    border: 0;
    padding: 0 12px;
    height: 40px;
}
.btn-ghost:hover { color: var(--brand-blue); }

.btn-sm { height: 36px; padding: 0 16px; font-size: 14px; }
.btn-lg { height: 56px; padding: 0 32px; font-size: 16px; }

/* ── Layout ── */
.section {
    padding: 96px 24px;
    max-width: var(--content-max);
    margin: 0 auto;
}
.section-tight { padding: 64px 24px; }

.section-title {
    text-align: center;
    margin-bottom: 56px;
}
.section-title h2 { margin-bottom: 16px; }
.section-title p { color: var(--text-secondary); max-width: 720px; margin: 0 auto; }

/* ── Cards ── */
.card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all 0.2s ease;
}
.card:hover {
    border-color: rgba(0, 0, 0, 0.16);
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

.card-elevated {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

/* ── Form elements ── */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    height: 48px;
    padding: 0 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    background: var(--white);
    font-family: inherit;
    font-size: 15px;
    color: var(--text-dark);
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.form-textarea { height: auto; padding: 12px 16px; min-height: 120px; resize: vertical; }
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px rgba(20, 86, 240, 0.12);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

/* ── Footer ── */
footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 64px 24px 32px;
    margin-top: 96px;
}
footer .footer-inner {
    max-width: var(--content-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
}
footer h5 { color: var(--white); font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px; }
footer a { color: var(--gray-300); display: block; padding: 4px 0; }
footer a:hover { color: var(--white); }
footer .footer-bottom {
    max-width: var(--content-max);
    margin: 48px auto 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
    color: var(--gray-500);
}

/* ── Utilities ── */
.container {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 24px;
}
.text-center { text-align: center; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-6 { margin-bottom: 48px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.grid { display: grid; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ── Responsive nav (≤1024) ── */
@media (max-width: 1024px) {
    nav .nav-links { display: none; }
    nav .nav-cta-group .nav-cta { display: none; }
    nav .nav-hamburger { display: inline-flex; }
    footer .footer-inner { grid-template-columns: 1fr 1fr; }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* ── Responsive (≤640) ── */
@media (max-width: 640px) {
    .section { padding: 64px 16px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    footer .footer-inner { grid-template-columns: 1fr; }
    footer .footer-bottom { flex-direction: column; align-items: flex-start; }
}