:root {
  --color-bg: #f6fbff;
  --color-surface: #ffffff;
  --color-card: #ffffff;
  --color-primary: #2f6bff;
  --color-primary-600: #2558e6;
  --color-primary-700: #1e46c7;
  --color-accent: #27c3ff;
  --color-text: #0f2137;
  --color-muted: #6b7280;
  --color-border: #e5effa;
  --color-info: #27c3ff;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-pink: #ff6bb3;
  --shadow-lg: 0 20px 40px rgba(0,0,0,.10);
  --shadow-md: 0 10px 24px rgba(0,0,0,.08);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --container: 1200px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
  color: var(--color-text);
  background: radial-gradient(1200px 600px at 80% -10%, rgba(46,107,255,.10), transparent 60%),
              radial-gradient(1000px 500px at -10% 10%, rgba(39,195,255,.14), transparent 60%),
              var(--color-bg);
  line-height: 1.6;
}

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: saturate(140%) blur(10px);
  background: linear-gradient(180deg, rgba(255,255,255,.94), rgba(255,255,255,.86));
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--color-text); }
.brand__logo {
  width: 36px; height: 36px; border-radius: 10px;
  background: conic-gradient(from 210deg, var(--color-primary), var(--color-accent), var(--color-pink));
  box-shadow: 0 8px 20px rgba(47,107,255,.25);
}
.brand__name { font-weight: 700; letter-spacing: .3px; }
.brand__logo-img { display: block; height: 28px; width: auto; border-radius: 6px; object-fit: contain; }
@media (min-width: 1024px) {
  .brand__logo-img { height: 32px; border-radius: 8px; }
}

.nav__links { display: flex; align-items: center; gap: 18px; }
.nav__link { color: var(--color-muted); text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.nav__link:hover, .nav__link.active { color: var(--color-text); background: rgba(47,107,255,.10); }

.nav__cta { padding: 8px 14px; border-radius: 10px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); color: #ffffff; font-weight: 600; text-decoration: none; box-shadow: var(--shadow-md); }
.nav__cta:hover { filter: brightness(1.07); }

.nav__toggle { display: none; background: transparent; border: 1px solid var(--color-border); color: var(--color-text); padding: 8px 10px; border-radius: 8px; }

/* Hero / Slider */
.hero {
  padding: 28px 0 0;
}
.slider {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(47,107,255,.06), rgba(39,195,255,.10));
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}
.slides { display: flex; transition: transform .6s cubic-bezier(.25,.8,.25,1); }
.slide {
  position: relative;
  min-width: 100%;
  padding: 80px 40px;
  display: block;
  min-height: 480px;
}
.slide__visual {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  background: radial-gradient(500px 220px at 60% 20%, rgba(47,107,255,.25), transparent 60%),
              radial-gradient(400px 240px at 30% 70%, rgba(39,195,255,.24), transparent 60%),
              linear-gradient(140deg, #eaf2ff, #ffffff);
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0,0,0,.06) inset, 0 10px 30px rgba(15, 23, 42, .06);
}
.slide::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,.28), rgba(255,255,255,.06));
  pointer-events: none;
}
.slide__content { position: relative; z-index: 1; max-width: 720px; }
.slide__content h1, .slide__content h2 { margin: 0 0 10px; line-height: 1.2; text-shadow: 0 2px 6px rgba(0,0,0,.06); }
.slide__content p { color: var(--color-text); margin: 0 0 16px; text-shadow: 0 1px 3px rgba(0,0,0,.04); }
.slide__actions { display: flex; gap: 12px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px; border-radius: 10px; text-decoration: none; font-weight: 600; }
.btn--primary { background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); color: #ffffff; box-shadow: var(--shadow-md); }
.btn--primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn--ghost { border: 1px solid var(--color-border); color: var(--color-text); background: #ffffff; }

.slider__dots { position: absolute; bottom: 14px; left: 0; right: 0; display: flex; justify-content: center; gap: 8px; }
.dot { width: 8px; height: 8px; border-radius: 99px; background: rgba(0,0,0,.18); border: 1px solid var(--color-border); }
.dot.active { background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); }

.slider__nav { position: absolute; inset: 0; display: flex; align-items: center; justify-content: space-between; padding: 0 8px; pointer-events: none; }
.slider__btn { pointer-events: all; border: 1px solid var(--color-border); background: rgba(255,255,255,.9); color: var(--color-text); width: 36px; height: 36px; border-radius: 8px; display: grid; place-items: center; }

/* Sections */
.section { padding: 64px 0; }
/* alternate light colorful bands for freshness without changing HTML */
.section:nth-of-type(even) {
  background: linear-gradient(180deg, #ffffff, #f2f8ff);
}
.section__head { display: flex; align-items: end; justify-content: space-between; margin-bottom: 20px; }
.section__title { font-size: 22px; border-bottom: 3px solid rgba(47,107,255,.20); display: inline-block; padding-bottom: 6px; }
.section__desc { color: var(--color-muted); }
.grid { display: grid; gap: 16px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 18px; box-shadow: var(--shadow-md); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.card:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(47,107,255,.12); border-color: rgba(47,107,255,.28); }
.card h3 { margin-top: 0; }
.card p { color: var(--color-muted); }
.badge { display: inline-block; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--color-border); color: var(--color-text); font-size: 12px; background: linear-gradient(135deg, #eef4ff, #e8fbff); }
/* colorful variations by position to enrich visuals */
.grid .card:nth-child(3n+1) .badge { background: linear-gradient(135deg, #eef4ff, #e8fbff); border-color: #e3efff; }
.grid .card:nth-child(3n+2) .badge { background: linear-gradient(135deg, #e8fff2, #f1fff6); border-color: #dcfce7; }
.grid .card:nth-child(3n+3) .badge { background: linear-gradient(135deg, #fff4ec, #fff7ee); border-color: #ffe4c7; }

/* Forms */
.form { display: grid; gap: 14px; }
.form__row { display: grid; gap: 14px; grid-template-columns: repeat(2, 1fr); }
.label { display: block; font-weight: 600; margin-bottom: 6px; }
.input, .textarea, .select { width: 100%; padding: 10px 12px; border-radius: 10px; background: #ffffff; color: var(--color-text); border: 1px solid var(--color-border); }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(47,107,255,.18); }
.textarea { min-height: 120px; resize: vertical; }
.form__actions { display: flex; gap: 10px; }
.help { color: var(--color-muted); font-size: 12px; }
.error { color: #c2410c; font-size: 12px; }

/* Footer */
.footer { border-top: 1px solid var(--color-border); background: linear-gradient(180deg, #ffffff, #f3f9ff); margin-top: 60px; }
.footer__grid { display: grid; grid-template-columns: 1.2fr repeat(4, 1fr); gap: 20px; padding: 32px 0; }
.footer a { color: var(--color-muted); text-decoration: none; }
.footer a:hover { color: var(--color-primary); }
.footer__bottom { display: flex; justify-content: space-between; align-items: center; padding: 12px 0 24px; color: var(--color-muted); border-top: 1px dashed var(--color-border); }

/* Utilities */
.kpi { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.kpi__item { padding: 16px; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-md); text-align: center; }
.kpi__num { font-size: 24px; font-weight: 700; color: var(--color-primary); }
.kpi__label { color: var(--color-muted); }
/* colorful KPI accents */
.kpi__item:nth-child(1) .kpi__num { color: var(--color-primary); }
.kpi__item:nth-child(2) .kpi__num { color: var(--color-success); }
.kpi__item:nth-child(3) .kpi__num { color: var(--color-info); }
.kpi__item:nth-child(4) .kpi__num { color: var(--color-warning); }

/* Responsive */
@media (max-width: 1024px) {
  .slide { min-height: 420px; padding: 64px 24px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__toggle { display: inline-flex; }
  .section { padding: 44px 0; }
  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .kpi { grid-template-columns: 1fr 1fr; }
}

/* Slide themed backgrounds */
.slide--net-1 .slide__visual { background-image: url('../img/slide-internet-1.svg'), radial-gradient(500px 220px at 60% 20%, rgba(47,107,255,.25), transparent 60%), radial-gradient(400px 240px at 30% 70%, rgba(39,195,255,.24), transparent 60%), linear-gradient(140deg, #eaf2ff, #ffffff); background-size: cover, auto, auto, auto; background-position: center; }
.slide--net-2 .slide__visual { background-image: url('../img/slide-internet-2.svg'), radial-gradient(500px 220px at 60% 20%, rgba(47,107,255,.25), transparent 60%), radial-gradient(400px 240px at 30% 70%, rgba(39,195,255,.24), transparent 60%), linear-gradient(140deg, #eaf2ff, #ffffff); background-size: cover, auto, auto, auto; background-position: center; }
.slide--net-3 .slide__visual { background-image: url('../img/slide-internet-3.svg'), radial-gradient(500px 220px at 60% 20%, rgba(47,107,255,.25), transparent 60%), radial-gradient(400px 240px at 30% 70%, rgba(39,195,255,.24), transparent 60%), linear-gradient(140deg, #eaf2ff, #ffffff); background-size: cover, auto, auto, auto; background-position: center; }