/* =========================================================
   THEME TOKENS (reusable across pages)
   ========================================================= */
:root{
  --bg: rgb(28,28,33);
  --surface: rgb(48,48,54);
  --text: #fff;
  --border: rgba(255,255,255,0.10);

  /* Primary gradient (reusable anywhere) */
  --grad-a: rgb(82,80,222);
  --grad-b: rgb(0,229,251);

  /* Focus glow */
  --glow-a: rgba(0,229,251,0.22);
  --glow-b: rgba(82,80,222,0.16);
}

/* =========================================================
   BASE / RESET (reusable)
   ========================================================= */
html, body { height: 100%; }
* { box-sizing: border-box; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

/* =========================================================
   LAYOUT (reusable)
   ========================================================= */
.page{
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(16px, 4vw, 40px);
}

.card{
  width: min(760px, 92vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: clamp(18px, 4vw, 28px);
  box-shadow: 0 26px 90px rgba(0,0,0,0.55);
  padding: clamp(22px, 4.5vw, 38px);

  display: grid;
  gap: clamp(14px, 2.6vw, 22px);
  justify-items: center;
}

/* =========================================================
   CONTROLS (reusable)
   ========================================================= */
.input{
  width: 100%;
  height: clamp(46px, 6vw, 56px);
  border-radius: 999px;

  border: 1px solid rgba(255,255,255,0.08);
  background: var(--bg);
  color: var(--text);
  outline: none;
  text-align: center;

  font-size: clamp(14px, 3.8vw, 16px);
  letter-spacing: 0.2px;

  box-shadow:
    inset 0 10px 24px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.06);
  transition: box-shadow 180ms ease, border-color 180ms ease, transform 180ms ease;
}

/* Placeholder: looks like placeholder + gently fades on focus */
.input::placeholder,
.input::-webkit-input-placeholder{
  color: rgba(255,255,255,0.48);
  opacity: 1;
  letter-spacing: 0.15px;
  transform: translateY(0);
  transition: opacity 520ms ease, transform 520ms ease;
}

.input:focus::placeholder,
.input:focus::-webkit-input-placeholder{
  opacity: 0;
  transform: translateY(-2px);
}

.input:focus{
  border-color: rgba(0,229,251,0.35);
  box-shadow:
    0 0 0 3px var(--glow-a),
    0 0 0 7px var(--glow-b),
    inset 0 10px 24px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.06);
  transform: translateY(-1px);
}

.btn{
  position: relative;
  overflow: hidden;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  height: clamp(42px, 5.6vw, 48px);
  min-width: clamp(120px, 22vw, 150px);

  border: none;
  border-radius: 999px;
  cursor: pointer;

  color: #061018;
  font-weight: 800;
  letter-spacing: 0.5px;

  background: linear-gradient(90deg, var(--grad-a), var(--grad-b));
  box-shadow:
    0 12px 28px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.20);

  transition: transform 150ms ease, filter 150ms ease;
}

/* Crossfade to reversed gradient on hover */
.btn::before{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--grad-b), var(--grad-a));
  opacity: 0;
  transition: opacity 1200ms ease;
}
.btn:hover::before{ opacity: 1; }

.btn > *{
  position: relative;
  z-index: 1; /* keep label above overlay */
}

/* Pressed-in click feel */
.btn:active{
  transform: translateY(1px) scale(0.985);
  filter: brightness(0.97);
  box-shadow:
    0 6px 16px rgba(0,0,0,0.28),
    inset 0 2px 10px rgba(0,0,0,0.25),
    inset 0 1px 0 rgba(255,255,255,0.10);
}

/* =========================================================
   OVERLAY MODAL (reusable)
   ========================================================= */
.overlay{
  position: fixed;
  inset: 0;
  z-index: 999;
  display: grid;
  place-items: center;

  background: rgba(10,10,12,0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);

  opacity: 0;
  pointer-events: none;
  transition: opacity 320ms ease;
}
.overlay.is-open{
  opacity: 1;
  pointer-events: auto;
}

.modal{
  width: min(520px, 86vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: 0 30px 120px rgba(0,0,0,0.65);

  padding: 22px 22px 18px;

  display: grid;
  justify-items: center;
  gap: 10px;

  transform: translateY(10px) scale(0.96);
  opacity: 0;
  transition: transform 1000ms cubic-bezier(.2,.9,.2,1), opacity 520ms ease;
}
.overlay.is-open .modal{
  transform: translateY(0) scale(1);
  opacity: 1;
}

.spinner{
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: conic-gradient(from 0deg, var(--grad-a), var(--grad-b), var(--grad-a));
  -webkit-mask: radial-gradient(farthest-side, transparent 62%, #000 63%);
          mask: radial-gradient(farthest-side, transparent 62%, #000 63%);
  animation: spin 900ms linear infinite;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}
@keyframes spin{ to { transform: rotate(360deg); } }

.modal-title{
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 18px;
  margin-top: 2px;
}
.modal-text{
  color: rgba(255,255,255,0.92);
  text-align: center;
  line-height: 1.5;
  font-size: 14px;
}