/* ============================================================
   AI Studio — Light, clean stylesheet
   Edit CSS variables in :root to retheme the whole site.
   ============================================================ */

/* ── Variables ── */
:root {
  --color-primary:    #2563EB;
  --color-primary-dk: #1D4ED8;
  --color-accent:     #06B6D4;
  --color-text:       #0F172A;
  --color-muted:      #64748B;
  --color-light:      #94A3B8;
  --color-bg:         #FFFFFF;
  --color-bg-alt:     #F8FAFC;
  --color-bg-soft:    #F1F5F9;
  --color-border:     #E2E8F0;
  --font-body:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-heading:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --max-width:        1180px;
  --radius:           8px;
  --radius-lg:        14px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-body); color: var(--color-text); background: var(--color-bg); line-height: 1.6; }
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--color-primary-dk); }
ul { list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--color-text); letter-spacing: -0.02em; line-height: 1.15; }

/* ── Container ── */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* ── Header ── */
.site-header { background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(10px); -webkit-backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--color-border); padding: 1rem 0; position: sticky; top: 0; z-index: 100; }
.site-header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.15rem; font-weight: 700; color: var(--color-text); display: inline-flex; align-items: center; gap: .55rem; }
.logo-mark { width: 26px; height: 26px; border-radius: 7px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); display: inline-block; }
.main-nav { display: flex; align-items: center; gap: 1.75rem; }
.main-nav a { color: var(--color-muted); font-size: 0.94rem; font-weight: 500; }
.main-nav a:hover { color: var(--color-text); }
.main-nav a.active { color: var(--color-text); }
.nav-cta { margin-left: .5rem; }

/* ── Buttons ── */
.btn { display: inline-block; padding: 0.75rem 1.5rem; border-radius: var(--radius); font-weight: 600; font-size: 0.95rem; cursor: pointer; transition: all 0.15s ease; border: 1px solid transparent; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dk); color: #fff; }
.btn-secondary { background: var(--color-bg); color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { border-color: var(--color-text); color: var(--color-text); }
.btn-sm { padding: .5rem 1rem; font-size: .875rem; }

/* ── Hero ── */
.hero { padding: 6rem 0 5rem; text-align: center; background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%); }
.eyebrow { display: inline-block; padding: .35rem .85rem; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 99px; font-size: .8rem; font-weight: 600; color: var(--color-primary); margin-bottom: 1.5rem; letter-spacing: .02em; }
.hero-heading { font-size: clamp(2.25rem, 5.5vw, 3.75rem); font-weight: 800; max-width: 880px; margin: 0 auto 1.25rem; }
.hero-heading .grad { background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 1.18rem; color: var(--color-muted); max-width: 640px; margin: 0 auto 2.25rem; }
.hero-actions { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }

/* ── Page banner (non-home pages) ── */
.page-banner { padding: 4.5rem 0 3rem; background: var(--color-bg-alt); border-bottom: 1px solid var(--color-border); text-align: center; }
.page-banner h1 { font-size: clamp(2rem, 4vw, 2.75rem); font-weight: 800; margin-bottom: .75rem; }
.page-banner p { color: var(--color-muted); font-size: 1.1rem; max-width: 620px; margin: 0 auto; }

/* ── Sections ── */
.section { padding: 5rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-header { text-align: center; max-width: 680px; margin: 0 auto 3rem; }
.section-header h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); font-weight: 800; margin-bottom: .75rem; }
.section-header p { color: var(--color-muted); font-size: 1.05rem; }

/* ── Logos strip ── */
.logos-strip { padding: 2.5rem 0; border-bottom: 1px solid var(--color-border); }
.logos-strip .label { text-align: center; color: var(--color-light); font-size: .8rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 1.5rem; }
.logos-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 2.5rem 3rem; align-items: center; }
.logos-row span { color: var(--color-light); font-weight: 700; font-size: 1.1rem; letter-spacing: -.01em; }

/* ── Feature grid ── */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.feature-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.75rem; transition: border-color .2s ease, transform .2s ease; }
.feature-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.feature-icon { width: 44px; height: 44px; border-radius: 10px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); display: inline-flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.15rem; margin-bottom: .5rem; }
.feature-card p { color: var(--color-muted); font-size: .95rem; }

/* ── Stats ── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 2rem; text-align: center; }
.stat-value { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { color: var(--color-muted); font-size: .95rem; margin-top: .35rem; }

/* ── CTA band ── */
.cta-band { padding: 5rem 0; text-align: center; }
.cta-card { background: var(--color-text); color: #fff; border-radius: var(--radius-lg); padding: 3.5rem 2rem; }
.cta-card h2 { color: #fff; font-size: clamp(1.75rem, 3.5vw, 2.5rem); margin-bottom: .75rem; }
.cta-card p { color: rgba(255,255,255,0.7); max-width: 540px; margin: 0 auto 1.75rem; font-size: 1.05rem; }
.cta-card .btn-primary { background: #fff; color: var(--color-text); }
.cta-card .btn-primary:hover { background: var(--color-bg-soft); }

/* ── Case study / portfolio cards ── */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.case-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: border-color .2s ease; }
.case-card:hover { border-color: var(--color-primary); }
.case-thumb { aspect-ratio: 16 / 9; background: linear-gradient(135deg, var(--color-bg-soft), var(--color-bg-alt)); display: flex; align-items: center; justify-content: center; color: var(--color-light); font-weight: 700; font-size: 1.25rem; letter-spacing: -.02em; }
.case-body { padding: 1.5rem; }
.case-tag { display: inline-block; font-size: .75rem; font-weight: 600; color: var(--color-primary); text-transform: uppercase; letter-spacing: .08em; margin-bottom: .5rem; }
.case-body h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.case-body p { color: var(--color-muted); font-size: .95rem; margin-bottom: 1rem; }
.case-meta { display: flex; gap: 1.25rem; font-size: .85rem; color: var(--color-muted); border-top: 1px solid var(--color-border); padding-top: 1rem; }
.case-meta strong { color: var(--color-text); display: block; font-size: 1rem; }

/* ── About / team ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.25rem; margin-top: 2.5rem; }
.value-item { padding: 1.5rem; border-left: 3px solid var(--color-primary); background: var(--color-bg-alt); border-radius: 0 var(--radius) var(--radius) 0; }
.value-item h4 { font-size: 1.05rem; margin-bottom: .35rem; }
.value-item p { color: var(--color-muted); font-size: .92rem; }

/* ── Contact form ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 3rem; }
.contact-info h3 { font-size: 1.25rem; margin-bottom: 1rem; }
.contact-info p { color: var(--color-muted); margin-bottom: 1.5rem; }
.contact-info ul li { padding: .5rem 0; color: var(--color-text); }
.contact-info ul li strong { color: var(--color-muted); display: block; font-weight: 500; font-size: .85rem; margin-bottom: .15rem; }
.contact-form { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 2rem; }
.form-row { margin-bottom: 1.25rem; }
.form-row label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: .4rem; color: var(--color-text); }
.form-row input, .form-row textarea, .form-row select { width: 100%; padding: .75rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius); font-family: inherit; font-size: .95rem; background: var(--color-bg); color: var(--color-text); transition: border-color .15s ease; }
.form-row input:focus, .form-row textarea:focus, .form-row select:focus { outline: none; border-color: var(--color-primary); }
.form-row textarea { resize: vertical; min-height: 120px; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* ── Process / steps ── */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; counter-reset: step; }
.step { padding: 1.5rem; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); position: relative; }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); display: block; font-size: 1.5rem; font-weight: 800; color: var(--color-primary); margin-bottom: .75rem; font-variant-numeric: tabular-nums; }
.step h4 { font-size: 1.05rem; margin-bottom: .5rem; }
.step p { color: var(--color-muted); font-size: .92rem; }

/* ── Footer ── */
.site-footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); padding: 3.5rem 0 1.75rem; color: var(--color-muted); font-size: .9rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.5rem; }
.footer-grid h5 { font-size: .85rem; font-weight: 700; color: var(--color-text); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 1rem; }
.footer-grid ul li { padding: .25rem 0; }
.footer-grid ul li a { color: var(--color-muted); }
.footer-grid ul li a:hover { color: var(--color-text); }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 1.5rem; border-top: 1px solid var(--color-border); font-size: .85rem; }
.footer-brand p { margin-top: .75rem; max-width: 340px; }

/* ── Responsive ── */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 640px) {
  .main-nav { gap: 1rem; }
  .main-nav a:not(.btn) { display: none; }
  .nav-cta { display: inline-block; }
  .hero { padding: 4rem 0 3rem; }
  .section { padding: 3.5rem 0; }
  .cta-card { padding: 2.5rem 1.5rem; }
  .form-grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; gap: .5rem; text-align: center; }
}