:root {
    --primary-color: #007bff; 
    --success-color: #28a745; 
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --secondary-color: #6c757d;
    --background-color: #f4f7f6;
    --card-background: #ffffff; 
    --text-color: #333333;
    --text-light: #555555;
    --border-color: #dee2e6;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 10px;
}

header {
    width: 100%;
    max-width: 900px;
    background: var(--card-background);
    padding: 25px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-top: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 4px solid var(--primary-color);
}

header h1 {
    font-size: 2.2em;
    color: var(--primary-color);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-action-btn {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.header-action-btn:hover {
    background: var(--primary-color);
    color: var(--card-background);
}

#addPasswordBtn {
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 2.5em;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.4);
}

#addPasswordBtn:hover {
    background-color: #218838;
    transform: rotate(90deg);
}

main {
    width: 100%;
    max-width: 900px;
    padding: 20px 0;
}

#passwordList {
    list-style: none;
    padding: 0;
}

#passwordList li {
    background: var(--card-background);
    padding: 25px 30px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 5px solid var(--primary-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

#passwordList li:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

#passwordList li strong {
    font-size: 1.3em;
    color: var(--primary-color);
}

#passwordList li .details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    margin: 0 30px;
}

#passwordList li .details span {
    margin: 3px 0;
    font-size: 1.1em;
    color: var(--text-light);
}

.empty-list-message {
    text-align: center;
    padding: 50px;
    font-style: italic;
    color: var(--text-light);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    background: var(--card-background);
}

.modal {
    display: none; 
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5); 
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 450px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-top: 5px solid var(--primary-color);
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s ease-out, opacity 0.3s ease-out;
}

.modal.show .modal-content {
    transform: scale(1);
    opacity: 1;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 30px;
    font-weight: bold;
    line-height: 1;
    transition: color 0.3s;
}

.close-btn:hover,
.close-btn:focus {
    color: var(--danger-color);
    cursor: pointer;
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 25px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

#passwordForm input[type="text"] {
    width: 100%;
    padding: 14px;
    margin: 10px 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: #f9f9f9;
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#passwordForm input[type="text"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(0,123,255,0.3);
    outline: none;
}

.password-input-group {
    display: flex;
    align-items: center;
    margin: 10px 0;
}

.password-input-group input {
    border-radius: 6px 0 0 6px !important;
}

#generatePasswordBtn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    font-size: 1.4em;
    transition: background-color 0.3s;
}

#generatePasswordBtn:hover {
    background-color: #0056b3;
}

.submit-btn {
    width: 100%;
    background-color: var(--success-color);
    color: white;
    padding: 16px 20px;
    margin-top: 25px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2em;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.2s;
}

.submit-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.action-btn {
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-left: 10px;
    font-size: 0.9em;
    font-weight: bold;
    color: white;
    transition: all 0.3s;
}

.toggle-password {
    background: var(--warning-color); 
    color: #333;
}
.toggle-password:hover {
    background: #e0a800;
}
.toggle-password.hidden-state {
    background: var(--secondary-color); 
    color: white;
}
.toggle-password.hidden-state:hover {
    background: #5a6268;
}

.edit-password {
    background: var(--primary-color);
}
.edit-password:hover {
    background: #0056b3;
}

.delete-password {
    background: var(--danger-color); 
}
.delete-password:hover {
    background: #c82333;
}