/* ============================================================
   APlusZ — App Styles (mobile + desktop responsive)
   File: frontend/assets/app.css
   Save: D:\Destop\AplusZ\frontend\assets\app.css
   ============================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- TOPBAR ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-4);
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: var(--sp-2); }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--r-sm);
  font-weight: 800; font-size: 0.75rem; letter-spacing: -0.02em;
}
.brand-name { font-weight: 700; font-size: var(--fs-lg); letter-spacing: -0.01em; }
.topnav { display: flex; gap: var(--sp-1); }
.icon-btn {
  width: 40px; height: 40px;
  border-radius: var(--r-pill);
  display: grid; place-items: center;
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: background var(--dur-base) var(--ease-spring), color var(--dur-base) var(--ease-spring);
}
.icon-btn:hover { background: var(--bg-elevated); color: var(--text); }

/* ---------- HERO (mobile default) ---------- */
.hero {
  position: relative;
  max-width: 540px;
  margin: 0 auto;
  padding: var(--sp-12) var(--sp-4) var(--sp-8);
  text-align: center;
}
.hero-glow {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 80%; height: 320px;
  background: radial-gradient(ellipse at center, var(--accent) 0%, transparent 60%);
  opacity: 0.12;
  filter: blur(60px);
  pointer-events: none;
  z-index: -1;
}
.hero-title {
  font-size: clamp(2.5rem, 9vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: var(--sp-3);
}
.hero-title .accent {
  color: var(--accent);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  color: var(--text-muted);
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-8);
}

/* ---------- SEARCH CARD (mobile stacked) ---------- */
.search-card {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: var(--sp-4);
  box-shadow: var(--shadow-lg), var(--glow);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  text-align: left;
}
.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-3) var(--sp-4);
  transition: border-color var(--dur-base) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring);
}
.field:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.15);
}
.field label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 600;
}
.field input {
  background: transparent;
  border: none; outline: none;
  color: var(--text);
  font-size: var(--fs-lg);
  font-weight: 500;
  padding: 0; width: 100%;
}
.field input::placeholder { color: var(--text-dim); }

.swap-btn {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%) rotate(0deg);
  width: 44px; height: 44px;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--bg);
  font-size: 1.2rem; font-weight: 700;
  display: grid; place-items: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur-base) var(--ease-spring);
  z-index: 2;
}
.swap-btn:hover { transform: translate(-50%, -50%) rotate(180deg); }

.primary-btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color: var(--bg);
  padding: var(--sp-4);
  border-radius: var(--r-md);
  font-size: var(--fs-base);
  font-weight: 700;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur-base) var(--ease-spring), box-shadow var(--dur-base) var(--ease-spring);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.primary-btn:active { transform: translateY(0); }

/* ---------- RESULT ---------- */
.result {
  margin-top: var(--sp-6);
  text-align: left;
  animation: fadeUp var(--dur-slow) var(--ease-spring);
}
.result.hidden { display: none; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- TRUST ---------- */
.trust {
  margin-top: var(--sp-8);
  display: flex;
  justify-content: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
  font-size: var(--fs-sm);
  color: var(--text-dim);
}

/* ---------- FOOTER ---------- */
.footer {
  text-align: center;
  padding: var(--sp-8) var(--sp-4);
  color: var(--text-dim);
  font-size: var(--fs-sm);
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
}

/* ============================================================
   TABLET (≥720px)
   ============================================================ */
@media (min-width: 720px) {
  .topbar { padding: var(--sp-4) var(--sp-8); }

  .hero {
    max-width: 1100px;
    padding: var(--sp-16) var(--sp-8) var(--sp-12);
  }
  .hero-title {
    font-size: clamp(4rem, 8vw, 6rem);
    letter-spacing: -0.05em;
  }
  .hero-sub {
    font-size: var(--fs-2xl);
    margin-bottom: var(--sp-12);
  }
  .hero-glow {
    height: 500px;
    opacity: 0.18;
  }

  /* Horizontal pill search bar */
  .search-card {
    flex-direction: row;
    align-items: stretch;
    gap: var(--sp-2);
    padding: var(--sp-3);
    border-radius: var(--r-pill);
    max-width: 880px;
    margin: 0 auto;
  }
  .search-card .field {
    flex: 1;
    border-radius: var(--r-pill);
    padding: var(--sp-3) var(--sp-6);
  }
  .swap-btn {
    position: static;
    transform: rotate(90deg);
    align-self: center;
    flex-shrink: 0;
  }
  .swap-btn:hover { transform: rotate(270deg); }
  .primary-btn {
    border-radius: var(--r-pill);
    padding: 0 var(--sp-8);
    white-space: nowrap;
    flex-shrink: 0;
    font-size: var(--fs-lg);
  }

  .result {
    margin-top: var(--sp-8);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }

  .trust {
    gap: var(--sp-8);
    font-size: var(--fs-base);
    margin-top: var(--sp-12);
  }
}

/* ============================================================
   DESKTOP (≥1100px)
   ============================================================ */
@media (min-width: 1100px) {
  .hero {
    max-width: 1280px;
    padding: 6rem var(--sp-12) var(--sp-16);
  }
  .hero-title {
    font-size: 7rem;
    line-height: 1;
  }
  .hero-sub {
    font-size: 1.6rem;
    margin-bottom: var(--sp-16);
  }
  .search-card { max-width: 960px; }
  .result { max-width: 800px; }
}

/* ============================================================
   ULTRA-WIDE (≥1600px)
   ============================================================ */
@media (min-width: 1600px) {
  .hero { max-width: 1440px; }
  .hero-title { font-size: 8rem; }
}

/* ============================================================
   TRUST HERO LINE — the precious "Free forever" promise
   ============================================================ */
.trust-hero {
  display: inline-block;
  color: var(--text);
  font-weight: 600;
  font-size: var(--fs-base);
}
.trust-hero strong {
  color: var(--text);
  font-weight: 700;
}

@media (min-width: 720px) {
  .trust-hero { font-size: var(--fs-lg); }
}

/* ============================================================
   BRAND NAME — A + plus + Z (theme-aware 2-color spelling)
   "A" and "Z" share the accent tone
   "plus" sits in muted tone — quieter middle
   ============================================================ */
.bn-az {
  color: var(--accent);
  font-weight: 700;
}
.bn-plus {
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero sub variant — slightly bolder so brand still reads */
.hero-sub .bn-az,
.hero-sub .bn-plus {
  font-weight: 600;
}

/* Footer mark — subtle */
.footer-mark {
  color: var(--text-dim);
  font-size: 0.85em;
  margin-left: 4px;
}