/* ========================================
   CSS Variables
   ======================================== */
:root {
  --bg1: #667eea;
  --bg2: #764ba2;
  --card: #ffffff;
  --text: #222;
  --muted: #6b7280;
}

/* ========================================
   Base Styles
   ======================================== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  padding: 24px;
}

/* ========================================
   Container & Typography
   ======================================== */
.wrap {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  color: var(--text);
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  padding: 28px;
}

h1 {
  margin: 0 0 6px;
  font-size: 28px;
  letter-spacing: 0.2px;
  text-align: center;
}

.sub {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
}

/* ========================================
   Grid & Cards
   ======================================== */
.grid {
  display: grid;
  gap: 12px;
}

.card {
  border-radius: 12px;
  padding: 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
}

.card.today {
  background: linear-gradient(135deg, #f093fb, #f5576c);
}

.label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.95;
}

.num {
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  margin-top: 6px;
}

/* ========================================
   States & Messages
   ======================================== */
.loading,
.error {
  text-align: center;
  padding: 24px;
  color: var(--muted);
}

.error {
  color: #b91c1c;
  background: #fee2e2;
  border: 1px solid #fecaca;
  border-radius: 8px;
}

/* ========================================
   Footer & Hints
   ======================================== */
.footer {
  margin-top: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.hint {
  margin-top: 8px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* ========================================
   Button
   ======================================== */
button.refresh {
  margin-top: 14px;
  width: 100%;
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.1s ease;
}

button.refresh:hover {
  opacity: 0.95;
}

button.refresh:active {
  transform: scale(0.99);
}

/* ========================================
   Responsive Design - Tablets & Phones
   ======================================== */
@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  .wrap {
    padding: 20px;
    max-width: 100%;
  }

  h1 {
    font-size: 24px;
    margin: 0 0 4px;
  }

  .sub {
    font-size: 12px;
    margin: 0 0 16px;
  }

  .grid {
    gap: 10px;
  }

  .card {
    padding: 14px;
  }

  .label {
    font-size: 10px;
  }

  .num {
    font-size: 28px;
  }

  button.refresh {
    padding: 12px;
    font-size: 15px;
  }

  .footer {
    font-size: 11px;
    margin-top: 12px;
  }
}

/* ========================================
   Responsive Design - Small Phones
   ======================================== */
@media (max-width: 400px) {
  body {
    padding: 12px;
  }

  .wrap {
    padding: 16px;
    border-radius: 12px;
  }

  h1 {
    font-size: 20px;
  }

  .num {
    font-size: 24px;
  }

  .card {
    padding: 12px;
  }
}