:root {
  --primary: #1e293b;
  --accent: #ff3131;
  --bg: #f8fafc;
  --white: #fff;
  --gray: #d1d5db;
  --radius: 14px;
  --shadow: 0 2px 12px #0001;
  --font-main: 'Inter', Arial, sans-serif;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--primary);
}

body {
  min-height: 100vh;
}

.logo {
  width: 110px;
  margin: 24px auto 10px auto;
  display: block;
}

.main-container {
  max-width: 420px;
  margin: 0 auto;
  padding: 32px 16px 90px;
}

.button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 1.1rem;
  padding: 15px;
  margin: 12px 0;
  width: 100%;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: background 0.2s;
  text-align: center;
  text-decoration: none;
}
.button:active { background: #c80000; }

.icon-btn {
  background: var(--white);
  border: 1px solid var(--gray);
  border-radius: 50%;
  padding: 12px;
  margin: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: box-shadow 0.2s;
}
.icon-btn:active { box-shadow: 0 0 0 2px var(--accent); }

.tab-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--primary);
  display: flex;
  justify-content: space-between;
  padding: 0 8px;
  height: 60px;
  box-shadow: 0 -2px 8px #0002;
  z-index: 10;
}
.tab-bar .icon-btn {
  background: none;
  border: none;
  color: var(--white);
  padding: 0;
  flex: 1 1 0;
  justify-content: center;
}
.tab-bar .icon-btn svg {
  width: 34px; height: 34px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 14px;
  padding: 16px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.card .actions {
  margin-left: auto;
  display: flex;
  gap: 6px;
}

@media (min-width: 700px) {
  .main-container { max-width: 550px; }
  .tab-bar { max-width: 550px; left: 50%; transform: translateX(-50%);}
}

/* Opcional: para mejorar el logo en pantallas pequeñas */
@media (max-width: 430px) {
  .logo { width: 80px; }
  .main-container { padding: 16px 4px 72px; }
}