/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

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

.view {
    display: none;
    min-height: 100vh;
}

.view.active {
    display: block;
}

/* Login View */
#login-view {
    background: #f5f5f5;
}

#login-view .container {
    max-width: 400px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid #eee;
}

#login-view h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

#login-view p {
    margin-bottom: 1.5rem;
    color: #666;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

button {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}

button:hover {
    background: #5a6fd8;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#login-form button {
    width: 100%;
    margin-top: 1rem;
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.app-header h1 {
    font-size: 1.5rem;
}

.app-header nav {
    display: flex;
    gap: 0.5rem;
}

.app-header button {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Email Controls */
.email-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

#search {
    flex: 1;
}

/* Email List */
.email-list {
    display: grid;
    gap: 0.5rem;
}

.email-item {
    background: white;
    border: 1px solid #eee;
    border-radius: 4px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.email-item:hover {
    border-color: #667eea;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.email-item.unread {
    border-left: 4px solid #667eea;
    font-weight: 500;
}

.email-meta {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #666;
}

.email-subject {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.email-preview {
    color: #888;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Email Read View */
.email-content {
    background: white;
    border-radius: 4px;
    overflow: hidden;
}

.email-header {
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
}

.email-header h1 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.email-header .email-meta {
    display: grid;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.email-body {
    padding: 1.5rem;
    line-height: 1.7;
}

.email-body pre {
    white-space: pre-wrap;
    font-family: inherit;
}

/* Compose Form */
.compose-form {
    background: white;
    border-radius: 4px;
    padding: 1.5rem;
}

.compose-form textarea {
    min-height: 300px;
    resize: vertical;
}

/* Loading and Error States */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    z-index: 1000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: #dc3545;
    color: white;
    padding: 1rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 1001;
    max-width: 400px;
}

.error-message button {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    padding: 0;
    cursor: pointer;
}

.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .app-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .app-header nav {
        justify-content: center;
    }
    
    .email-controls {
        flex-direction: column;
    }
    
    .email-meta {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }
    
    .email-header .email-meta {
        font-size: 0.8rem;
    }
    
    .compose-form textarea {
        min-height: 200px;
    }
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1.25rem;
    }
    
    .app-header button {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
    
    .email-item {
        padding: 0.75rem;
    }
    
    .email-header, .email-body, .compose-form {
        padding: 1rem;
    }
}