/* ============================================================
   Web Nhanh — style.css (trang portfolio giới thiệu dịch vụ)
   Phong cách: sáng, hiện đại, đáng tin cậy. Nhấn màu chàm (indigo).
   → Đổi tông màu tại :root bên dưới.
   ============================================================ */

/* ---------- Biến giao diện ---------- */
:root {
  --primary: #4f46e5;       /* chàm (indigo) */
  --primary-dark: #4338ca;
  --bg: #ffffff;
  --alt: #f5f7fb;           /* nền section xen kẽ */
  --text: #111827;
  --muted: #6b7280;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(17, 24, 39, .08);
  --font: 'Be Vietnam Pro', 'Segoe UI', sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container { width: min(1100px, 92%); margin: 0 auto; }
.section { padding: 72px 0; }
.section-alt { background: var(--alt); }
.section-title { font-size: clamp(1.7rem, 3.5vw, 2.3rem); text-align: center; font-weight: 800; }
.section-sub { text-align: center; color: var(--muted); margin: 10px auto 40px; max-width: 600px; }

/* ---------- Nút ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: .98rem; cursor: pointer; border: none;
  font-family: var(--font);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(79, 70, 229, .3); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--text); border: 2px solid #d7dbe7; }
.btn-lg { padding: 16px 32px; font-size: 1.05rem; }
.btn-nav { padding: 9px 20px; font-size: .9rem; }
.btn-zalo { background: #0068ff; color: #fff; box-shadow: 0 8px 20px rgba(0, 104, 255, .28); }
.btn-fb { background: linear-gradient(45deg, #00b2ff, #006aff); color: #fff; box-shadow: 0 8px 20px rgba(0, 106, 255, .28); }
.btn-call { background: #111827; color: #fff; box-shadow: 0 8px 20px rgba(17, 24, 39, .25); }
.btn-ico { font-size: 1.1rem; }

/* ---------- Điều hướng ---------- */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 50; transition: background .25s ease, box-shadow .25s ease; }
.nav.scrolled { background: rgba(255, 255, 255, .95); box-shadow: 0 2px 16px rgba(17, 24, 39, .08); backdrop-filter: blur(8px); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.nav-logo { font-weight: 800; font-size: 1.2rem; color: var(--primary); }
.nav-toggle { display: block; background: none; border: none; font-size: 1.7rem; color: var(--text); cursor: pointer; line-height: 1; }

.nav-links {
  position: fixed; top: 58px; left: 0; right: 0;
  background: #fff; flex-direction: column; gap: 16px; padding: 22px;
  box-shadow: var(--shadow); transform: translateY(-150%); transition: transform .3s ease;
  z-index: 49;
}
.nav-links.open { transform: translateY(0); }
.nav-links a:not(.btn) { color: var(--text); font-weight: 500; }

@media (min-width: 820px) {
  .nav-toggle { display: none; }
  .nav-links {
    position: static; transform: none; background: none; box-shadow: none;
    flex-direction: row; padding: 0; gap: 24px; margin-left: auto;
  }
}

/* ---------- Hero ---------- */
.hero {
  padding: 150px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #eef2ff 0%, #ffffff 100%);
}
.hero-badge {
  display: inline-block; background: #e0e7ff; color: var(--primary-dark);
  font-size: .85rem; font-weight: 600; padding: 7px 16px;
  border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(1.9rem, 5vw, 3.1rem); font-weight: 800; line-height: 1.25; max-width: 760px; margin: 0 auto 18px; }
.hero-intro { color: var(--muted); max-width: 640px; margin: 0 auto 30px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 22px; }
.hero-trust { color: var(--muted); font-size: .92rem; }

/* ---------- Thẻ website mẫu ---------- */
.demos-grid { display: grid; gap: 22px; grid-template-columns: 1fr; }
.demo-card {
  background: #fff; border: 1px solid #e8ecf4; border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
  display: flex; flex-direction: column;
}
.demo-card:hover { transform: translateY(-5px); box-shadow: 0 16px 40px rgba(17, 24, 39, .13); }
.demo-thumb { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.demo-body { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.demo-tag { color: var(--primary); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .5px; }
.demo-body h3 { font-size: 1.25rem; font-weight: 700; }
.demo-body p { color: var(--muted); font-size: .94rem; flex: 1; }
.demo-btn { align-self: flex-start; }
@media (min-width: 720px) { .demos-grid { grid-template-columns: repeat(3, 1fr); } }

/* ---------- Bảng giá ---------- */
.pricing-grid { display: grid; gap: 22px; grid-template-columns: 1fr; max-width: 860px; margin: 0 auto; }
.price-card {
  position: relative; background: #fff; border: 2px solid #e8ecf4;
  border-radius: var(--radius); padding: 30px 26px;
  display: flex; flex-direction: column; gap: 14px;
}
.price-card.featured { border-color: var(--primary); box-shadow: 0 16px 40px rgba(79, 70, 229, .14); }
.price-flag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--primary); color: #fff; font-size: .78rem; font-weight: 700;
  padding: 4px 14px; border-radius: 999px; white-space: nowrap;
}
.price-name { font-size: 1.1rem; font-weight: 700; }
.price-amount { font-size: clamp(1.5rem, 3vw, 1.9rem); font-weight: 800; color: var(--primary-dark); }
.price-time { color: var(--muted); font-size: .9rem; margin-top: -10px; }
.price-features { list-style: none; display: flex; flex-direction: column; gap: 9px; flex: 1; }
.price-features li { padding-left: 26px; position: relative; font-size: .94rem; }
.price-features li::before { content: "✅"; position: absolute; left: 0; top: 1px; font-size: .9rem; }
.pricing-note { text-align: center; color: var(--muted); font-size: .9rem; margin-top: 28px; }
@media (min-width: 720px) { .pricing-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- Quy trình ---------- */
.steps-grid { display: grid; gap: 18px; grid-template-columns: 1fr; }
.step-card {
  background: #fff; border: 1px solid #e8ecf4; border-radius: var(--radius);
  padding: 24px 22px; text-align: center;
  transition: transform .2s ease, box-shadow .2s ease;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step-num {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 800; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
}
.step-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.step-card p { color: var(--muted); font-size: .92rem; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(4, 1fr); } }

/* ---------- Liên hệ ---------- */
.contact-wrap { text-align: center; }
.contact-actions { display: flex; flex-direction: column; gap: 14px; align-items: center; max-width: 420px; margin: 0 auto; }
.contact-actions .btn { width: 100%; justify-content: center; }

/* ---------- Footer ---------- */
.footer { background: #111827; color: #e5e7eb; text-align: center; padding: 28px 0; }
.footer-sub { opacity: .7; font-size: .9rem; margin-top: 4px; }

/* ---------- Nút nổi Zalo / Messenger ---------- */
.floating-buttons {
  position: fixed; right: 16px; bottom: 18px; z-index: 60;
  display: flex; flex-direction: column; gap: 10px;
}
.float-btn {
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; box-shadow: 0 6px 16px rgba(0, 0, 0, .22);
  transition: transform .15s ease;
}
.float-btn:hover { transform: scale(1.08); }
.zalo-btn { background: #0068ff; font-size: .76rem; letter-spacing: .2px; }
.fb-btn { background: linear-gradient(45deg, #00b2ff, #006aff); }

/* ---------- Form yêu cầu báo giá (portfolio) ---------- */
.quote-form {
  background: #fff; border: 2px solid var(--primary); border-radius: var(--radius);
  padding: 24px 22px; max-width: 860px; margin: 0 auto 22px;
  display: flex; flex-direction: column; gap: 16px;
  box-shadow: 0 12px 34px rgba(79, 70, 229, .12);
  text-align: left;
}
.quote-form.flash { animation: quotePulse 1.2s ease; }
@keyframes quotePulse {
  0% { box-shadow: 0 0 0 0 rgba(79, 70, 229, .45); }
  100% { box-shadow: 0 0 0 18px rgba(79, 70, 229, 0); }
}
.quote-grid { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .quote-grid { grid-template-columns: repeat(3, 1fr); } }
.quote-form label { display: flex; flex-direction: column; gap: 6px; font-size: .9rem; font-weight: 600; }
.quote-form input, .quote-form select {
  font: inherit; padding: 12px 14px; border: 1.5px solid #d7dbe7;
  border-radius: 10px; background: #f8f9ff; color: var(--text);
}
.quote-form input:focus, .quote-form select:focus { outline: none; border-color: var(--primary); }
.quote-form button { align-self: center; }
.contact-or { text-align: center; color: var(--muted); font-size: .9rem; margin: 4px 0 16px; }