:root {
  --bg: #f3f8f4;
  --panel: #ffffff;
  --primary: #1f9d69;
  --primary-dark: #14734b;
  --accent: #dff4e8;
  --text: #1d2a22;
  --muted: #617269;
  --border: #dfe8e3;
  --warning: #b94a48;
  --shadow: 0 12px 28px rgba(31, 37, 32, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #edf7f0 0%, #f7fbf8 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button, input, select, textarea {
  font: inherit;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

h1, h2, h3, p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 5vw, 2.8rem);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.auth-panel {
  max-width: 500px;
  margin: 30px auto;
  padding: 18px;
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.tab-button {
  border: none;
  background: #f1f5f2;
  padding: 12px 16px;
  cursor: pointer;
  color: var(--muted);
  font-weight: 700;
}

.tab-button.active {
  background: var(--primary);
  color: white;
}

.auth-form,
.log-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-form {
  display: none;
}

.auth-form.active-form {
  display: flex;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-weight: 600;
  color: var(--text);
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fbfcfb;
  padding: 12px 14px;
  color: var(--text);
}

textarea {
  resize: vertical;
  min-height: 88px;
}

.button {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--primary);
  color: white;
}

.button.secondary {
  background: #edf3ef;
  color: var(--text);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.summary-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.summary-card span {
  color: var(--muted);
  font-weight: 600;
}

.summary-card strong {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}

.summary-card small {
  color: var(--muted);
}

.summary-card.eco {
  background: linear-gradient(135deg, #eaf9f0, #ffffff);
}

.summary-card.water {
  background: linear-gradient(135deg, #eaf3ff, #ffffff);
}

.summary-card.waste {
  background: linear-gradient(135deg, #fff3e9, #ffffff);
}

.summary-card.energy {
  background: linear-gradient(135deg, #fff5db, #ffffff);
}

.content-panel {
  padding: 20px;
  margin-bottom: 20px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.logs-list {
  display: grid;
  gap: 12px;
}

.log-item {
  background: #f7faf8;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.log-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.log-item h3 {
  margin: 0;
  font-size: 1rem;
}

.log-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  color: var(--muted);
  font-size: 0.88rem;
}

.log-item .delete-btn {
  background: #fef1f1;
  color: var(--warning);
  border: 1px solid #f3d0d0;
  border-radius: 8px;
  padding: 8px 10px;
  font-weight: 700;
  cursor: pointer;
}

.monthly-report {
  display: grid;
  gap: 12px;
}

.month-row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  align-items: center;
  gap: 12px;
}

.month-label {
  font-weight: 700;
}

.bar-track {
  background: #ecf3ee;
  border-radius: 999px;
  overflow: hidden;
  height: 12px;
}

.bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #83d7a9);
  border-radius: 999px;
}

.month-value {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 700;
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(21, 28, 24, 0.94);
  color: white;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.hidden {
  display: none !important;
}

@media (max-width: 820px) {
  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding-left: 12px;
    padding-right: 12px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .field-row,
  .summary-grid,
  .month-row {
    grid-template-columns: 1fr;
  }

  .month-row {
    align-items: start;
  }

  .button {
    width: 100%;
  }
}