/* Main Stylesheet */

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

:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --danger-color: #e74c3c;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --light-bg: #ecf0f1;
  --border-color: #bdc3c7;
  --text-color: #2c3e50;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
  color: var(--text-color);
  line-height: 1.6;
}

/* Navigation */
nav {
  background-color: var(--primary-color);
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav > ul {
  list-style: none;
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  flex-wrap: nowrap;
  align-items: center;
}

nav > ul > li {
  margin-right: 0.25rem;
  position: relative;
}

nav > ul > li > a {
  display: block;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  white-space: nowrap;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s, background-color 0.2s;
}

nav > ul > li > a:hover,
nav > ul > li:hover > a {
  background-color: rgba(255,255,255,0.15);
}

/* Dropdown */
.nav-dropdown > a::after {
  content: " \25BE";
  font-size: 0.75rem;
  opacity: 0.8;
}

.nav-dropdown ul {
  list-style: none;
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  background-color: #1a252f;
  min-width: 200px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  z-index: 100;
  padding: 0.25rem 0;
}

.nav-dropdown:hover ul {
  display: block;
}

.nav-dropdown ul li {
  margin: 0;
}

.nav-dropdown ul a {
  display: block;
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-dropdown ul a:hover {
  background-color: rgba(255,255,255,0.1);
}

.nav-right {
  margin-left: auto;
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 2rem 0;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--primary-color);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s;
  font-weight: 500;
}

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

.btn-primary:hover {
  background-color: #2980b9;
}

.btn-success {
  background-color: var(--success-color);
  color: white;
}

.btn-success:hover {
  background-color: #229954;
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
}

.btn-danger:hover {
  background-color: #c0392b;
}

.btn-warning {
  background-color: var(--warning-color);
  color: white;
}

.btn-warning:hover {
  background-color: #e67e22;
}

.btn-secondary {
  background-color: var(--border-color);
  color: var(--primary-color);
}

.btn-secondary:hover {
  background-color: #95a5a6;
}

/* Messages */
.alert {
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  border-left: 4px solid;
}

.alert-success {
  background-color: #d4edda;
  border-left-color: var(--success-color);
  color: #155724;
}

.alert-danger {
  background-color: #f8d7da;
  border-left-color: var(--danger-color);
  color: #721c24;
}

.alert-warning {
  background-color: #fff3cd;
  border-left-color: var(--warning-color);
  color: #856404;
}

.alert-info {
  background-color: #d1ecf1;
  border-left-color: var(--secondary-color);
  color: #0c5460;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  border-radius: 4px;
  overflow: hidden;
}

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

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--light-bg);
}

tbody tr:hover {
  background-color: #f9f9f9;
}

/* Cards */
.card {
  background: white;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-header {
  background-color: var(--light-bg);
  padding: 1rem 1.5rem;
  margin: -1.5rem -1.5rem 1.5rem -1.5rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
}

/* Login Form */
.login-container {
  max-width: 400px;
  margin: 3rem auto;
  padding: 2rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.login-container h2 {
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: white;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  border-left: 4px solid var(--secondary-color);
}

.stat-card h3 {
  font-size: 2rem;
  color: var(--secondary-color);
  margin-bottom: 0.5rem;
}

.stat-card p {
  color: #7f8c8d;
  font-size: 0.9rem;
}

/* Utilities */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
  nav > ul {
    flex-direction: column;
    align-items: flex-start;
  }

  nav > ul > li {
    margin-right: 0;
    margin-bottom: 0.25rem;
    width: 100%;
  }

  .nav-dropdown ul {
    position: static;
    display: block;
    box-shadow: none;
    padding-left: 1rem;
    background-color: transparent;
  }

  .nav-right {
    margin-left: 0;
    margin-top: 1rem;
  }
  
  header h1 {
    font-size: 1.5rem;
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  table {
    font-size: 0.9rem;
  }
  
  th, td {
    padding: 0.75rem 0.5rem;
  }
}