/* TillyHK Ltd. - Main Stylesheet */

/* Root variables */
:root {
  --color-bg: #FFFFFF;
  --color-text: #0B2340;
  --color-accent: #0FA58A;
  --color-accent-dark: #0D8A6F;
  --color-muted: #F4F6F8;

  --container-max: 1200px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --radius-1: 6px;
  --radius-2: 10px;

  --shadow-1: 0 1px 2px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
}

/* Base reset / normalize-ish */
*,
*::before,
*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent-dark); text-decoration: none; }
a:hover { color: var(--color-accent); }
a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}
:focus-visible { scroll-margin-top: 80px; }

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-1);
  z-index: 1000;
}

/* Typography */
h1, h2, h3 { line-height: 1.2; margin: 0 0 var(--space-4); }
h1 { font-weight: 600; font-size: clamp(28px, 6vw, 40px); }
h2 { font-weight: 600; font-size: clamp(22px, 4.5vw, 28px); }
h3 { font-weight: 600; font-size: clamp(18px, 3.5vw, 22px); }
p { margin: 0 0 var(--space-4); }

/* Layout */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.section {
  padding: var(--space-8) 0;
}

/* Header / Nav */
.header {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-muted);
  z-index: 100;
}
.header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}
.header__title a {
  color: var(--color-text);
  font-weight: 600;
}
.nav {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
}
.nav a {
  color: var(--color-text);
  padding: var(--space-2) 0;
}
.nav a:hover { color: var(--color-accent); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-6);
  border-radius: var(--radius-2);
  border: 2px solid transparent;
  font-weight: 500;
  box-shadow: var(--shadow-1);
  transition: background-color .15s ease, color .15s ease, border-color .15s ease, transform .05s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover,
.btn--primary:focus-visible { background: var(--color-accent-dark); color: #fff; }
.btn--outline {
  background: transparent;
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}
.btn--outline:hover,
.btn--outline:focus-visible { background: var(--color-accent); color: #fff; }

/* Hero */
.hero {
  padding: var(--space-8) 0 var(--space-7);
  text-align: center;
}
.hero p {
  max-width: 740px;
  margin: 0 auto var(--space-6);
  color: #314156;
}
.hero__ctas {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

/* Features */
.features {
  background: var(--color-muted);
  padding: var(--space-8) 0;
}
.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.feature {
  background: #fff;
  border: 1px solid var(--color-muted);
  border-radius: var(--radius-2);
  padding: var(--space-6);
  text-align: left;
  box-shadow: var(--shadow-1);
}
.feature h3 { margin-bottom: var(--space-2); }

/* Showcase */
.showcase {
  padding: var(--space-8) 0 var(--space-8);
}
.showcase__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
.showcase figure {
  margin: 0;
  text-align: center;
}
.showcase img {
  border-radius: var(--radius-2);
  box-shadow: var(--shadow-1);
  background: #fff;
  border: 1px solid var(--color-muted);
}
.showcase figcaption {
  margin-top: var(--space-3);
  color: #3e4b60;
  font-weight: 500;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-muted);
  background: #fafbfc;
  padding: var(--space-7) 0;
  margin-top: var(--space-8);
  font-size: 14px;
}
.footer__links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-3);
}
.footer__links a { color: var(--color-text); }
.footer__links .sep { color: #9aa6b2; }
.footer small { color: #5a6a7d; }

/* Forms (for future contact form) */
.form { max-width: 600px; }
.form .group { margin-bottom: var(--space-5); }
.form label { font-weight: 500; display: block; margin-bottom: var(--space-2); }
.form input, .form textarea {
  width: 100%;
  border: 1px solid var(--color-muted);
  border-radius: var(--radius-1);
  padding: var(--space-3) var(--space-4);
  font: inherit;
  color: var(--color-text);
}
.form textarea { min-height: 120px; resize: vertical; }
.form input:focus-visible, .form textarea:focus-visible { outline-color: var(--color-accent); }

/* Media queries */
@media (min-width: 480px) {
  .container { padding: 0 var(--space-6); }
}
@media (min-width: 768px) {
  .features__grid { grid-template-columns: repeat(3, 1fr); }
  .showcase__grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .hero { padding: calc(var(--space-8) + var(--space-4)) 0 var(--space-8); }
}
@media (min-width: 1280px) {
  /* Reserved for any XL tweaks */
}