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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #4a6fa5;
    color: white;
    padding: 2rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 2rem;
}

h1, h2, h3 {
    margin-bottom: 1rem;
}

nav {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

nav li {
    margin-bottom: 0.5rem;
}

nav a {
    text-decoration: none;
    color: #4a6fa5;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #e9ecef;
}

main {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

section {
    margin-bottom: 2rem;
}

footer {
    text-align: center;
    padding: 1rem;
    color: #6c757d;
    font-size: 0.9rem;
}

/* Resource-specific styles */
.resource-container {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    color: #4a6fa5;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

/* Calculator styles */
.calculator {
    max-width: 400px;
    margin: 0 auto;
}

.calculator-screen {
    width: 100%;
    font-size: 2rem;
    height: 80px;
    border: none;
    background-color: #252525;
    color: #fff;
    text-align: right;
    padding-right: 20px;
    padding-left: 10px;
    border-radius: 5px 5px 0 0;
}

.calculator-keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    padding: 20px;
    background-color: #f4f4f4;
    border-radius: 0 0 5px 5px;
}

button {
    height: 60px;
    background-color: #fff;
    border: 1px solid #c4c4c4;
    font-size: 1.5rem;
    color: #333;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #eaeaea;
}

.operator, .equal-sign {
    background-color: #4a6fa5;
    color: #fff;
}

.operator:hover, .equal-sign:hover {
    background-color: #3a5a8a;
}

.clear {
    background-color: #f0506e;
    color: #fff;
}

.clear:hover {
    background-color: #d03d5a;
}

/* Timer styles */
.timer-container {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.timer-display {
    font-size: 3rem;
    margin: 2rem 0;
    font-family: monospace;
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.timer-btn {
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
}

/* Notes app styles */
.notes-container {
    max-width: 800px;
    margin: 0 auto;
}

.notes-input {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    resize: vertical;
    min-height: 150px;
}

.notes-list {
    list-style: none;
}

.note-item {
    background-color: #f8f9fa;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
    border-left: 4px solid #4a6fa5;
}

/* Unit converter styles */
.converter-container {
    max-width: 600px;
    margin: 0 auto;
}

.converter-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.converter-input, .converter-select {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 5px;
}

/* Weather checker styles */
.weather-container {
    max-width: 600px;
    margin: 0 auto;
}

.weather-search {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.weather-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.weather-btn {
    padding: 0.5rem 1rem;
    background-color: #4a6fa5;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.weather-result {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
}