:root {
  --primary-color: #3b82f6;
  --bg-color: #f8f9fa;
  --card-bg-color: #ffffff;
  --text-color: #212529;
  --subtle-text-color: #6c757d;
  --border-color: #dee2e6;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --font-family: "Poppins", sans-serif;
}

body.dark-mode {
  --bg-color: #121212;
  --card-bg-color: #1e1e1e;
  --text-color: #e0e0e0;
  --subtle-text-color: #a0a0a0;
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background-color: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .header {
  background-color: rgba(30, 30, 30, 0.7);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-svg {
  color: var(--primary-color);
}

.header-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.hamburger-menu {
  background: none;
  border: none;
  font-size: 1.75rem;
  cursor: pointer;
  color: var(--text-color);
}

.nav-panel {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100%;
  background-color: var(--card-bg-color);
  box-shadow: -5px 0 15px var(--shadow-color);
  z-index: 1002;
  padding: 2rem;
  transition: right 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.nav-panel.active {
  right: 0;
}

.nav-panel ul {
  list-style: none;
  margin-top: 2rem;
}

.nav-panel li {
  margin-bottom: 1.5rem;
}

.nav-panel a {
  text-decoration: none;
  color: var(--text-color);
  font-size: 1.1rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-panel a:hover {
  color: var(--primary-color);
}

.close-menu {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--subtle-text-color);
  cursor: pointer;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s, visibility 0.4s;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 1.5rem 2rem;
}

.hero {
  text-align: center;
  margin-bottom: 3rem;
}

.main-title {
  font-size: 3rem;
  font-weight: 700;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--subtle-text-color);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.widget h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  border-left: 4px solid var(--primary-color);
  padding-left: 0.75rem;
}

.card {
  background-color: var(--card-bg-color);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px var(--shadow-color);
  margin-bottom: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px var(--shadow-color);
}

.card h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.agenda-list {
  list-style: none;
  background-color: var(--card-bg-color);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.agenda-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.agenda-list li:last-child {
  border-bottom: none;
}

.agenda-list span {
  font-weight: 600;
  color: var(--primary-color);
  margin-right: 0.5rem;
}

.suggestion-form {
  background-color: var(--card-bg-color);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--subtle-text-color);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.btn {
  width: 100%;
  padding: 0.8rem;
  border: none;
  border-radius: 8px;
  background-color: var(--primary-color);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: #2563eb;
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.quote {
  color: var(--subtle-text-color);
  font-style: italic;
}

.dark-mode-toggle-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
}

.social-icons {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.social-icons a {
  color: var(--subtle-text-color);
  font-size: 1.5rem;
  transition: color 0.3s, transform 0.3s;
}

.social-icons a:hover {
  color: var(--primary-color);
  transform: translateY(-3px);
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

@media (min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero {
    margin-bottom: 4rem;
  }
  .main-title {
    font-size: 4rem;
  }
}

@media (min-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 2fr 1fr;
  }
  .widget:nth-child(1) {
    grid-column: 1 / 2;
    grid-row: 1 / 3;
  }
  .widget:nth-child(2) {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
  }
  .widget:nth-child(3) {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
  }
}