/* Modern Consistent Design System */

:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #6c757d;
    --color-secondary-hover: #5a6268;
    --color-success: #059669;
    --color-error: #dc2626;
    
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-lighter: #9ca3af;
    
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    
    --color-border: #e5e7eb;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --transition: 150ms ease;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: var(--spacing-lg);
    background-color: var(--color-bg-light);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 15px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-bg);
    padding: 0;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

/* Modern Navigation Bar */
.nav {
    background: #eff6ff;
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.nav a {
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0;
    border-radius: 0;
    transition: all var(--transition);
    position: relative;
    display: inline-block;
}

.nav a:hover {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.15);
}

.nav a:active {
    background: rgba(37, 99, 235, 0.2);
}

/* Typography */
h1 {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-text);
    letter-spacing: -0.3px;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
    color: var(--color-text);
    letter-spacing: -0.2px;
}

p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Content Area - Consistent Padding */
.container > *:not(.nav) {
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Action Boxes for Login/Register */
.action-box {
    background: var(--color-primary);
    color: white;
    border-radius: 6px;
    padding: var(--spacing-lg) var(--spacing-xl);
    text-decoration: none;
    display: block;
    transition: all var(--transition);
    text-align: center;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.action-box:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-box:active {
    transform: translateY(0);
}

.action-box-title {
    font-size: 16px;
    font-weight: 500;
    color: white;
    margin-bottom: var(--spacing-xs);
}

.action-box-subtitle {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.9);
}

/* Buttons - Consistent Styling */
.btn {
    background: var(--color-primary);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 6px;
    display: inline-block;
    margin: var(--spacing-xs) var(--spacing-xs) var(--spacing-xs) 0;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
    font-family: inherit;
}

.btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(0);
}

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

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

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

.btn-success:hover {
    background: #047857;
}

/* Note Cards */
.note-card {
    border: 1px solid var(--color-border);
    margin: var(--spacing-md) 0;
    padding: var(--spacing-lg);
    border-radius: 6px;
    background: var(--color-bg);
    transition: all var(--transition);
}

.note-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.note-card:first-child {
    margin-top: 0;
}

.note-title {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 18px;
    color: var(--color-text);
    line-height: 1.4;
}

.note-meta {
    color: var(--color-text-lighter);
    font-size: 13px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.note-content {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.7;
    word-wrap: break-word;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 14px;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 15px;
    font-family: inherit;
    transition: all var(--transition);
    background: var(--color-bg);
    color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-lighter);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
    line-height: 1.6;
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 13px;
    color: var(--color-text-lighter);
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-light);
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-group label {
    margin: 0;
    cursor: pointer;
    font-weight: 400;
}

/* Search Form */
.search-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: 0;
    flex-wrap: wrap;
}

.search-form input {
    flex: 1;
    min-width: 200px;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    transition: all var(--transition);
    background: var(--color-bg);
}

.search-form input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-form button {
    margin: 0;
    white-space: nowrap;
    padding: 8px 16px;
    font-size: 14px;
}

/* Messages */
.error {
    color: #991b1b;
    background: #fee2e2;
    padding: var(--spacing-md);
    border-radius: 6px;
    margin-bottom: var(--spacing-lg);
    border: 1px solid #fecaca;
    font-size: 14px;
}

.success {
    color: #065f46;
    background: #d1fae5;
    padding: var(--spacing-md);
    border-radius: 6px;
    margin-bottom: var(--spacing-lg);
    border: 1px solid #a7f3d0;
    font-size: 14px;
}

/* Info Box */
.info-box {
    background: var(--color-bg-light);
    padding: var(--spacing-lg);
    border-radius: 6px;
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 14px;
    line-height: 1.7;
}

.info-box strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Format Options */
.format-options {
    display: none;
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-light);
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.format-options.show {
    display: block;
    animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Note Header */
.note-header {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.note-header .note-title {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text);
    letter-spacing: -0.3px;
}

.note-header .note-meta {
    font-size: 14px;
    color: var(--color-text-light);
    padding: 0;
    border: none;
}

/* Navigation Links */
.nav-link {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.nav-link p {
    margin-bottom: var(--spacing-sm);
}

.nav-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-link a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Loading State */
#loading {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-text-light);
}

#error-message {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--color-error);
    font-weight: 500;
}

/* Secret Admin Panel */
.secret-admin-panel {
    display: none;
    background: red;
    color: white;
    padding: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .container {
        border-radius: 6px;
    }
    
    .nav {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav a {
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav a:last-child {
        border-bottom: none;
    }
    
    .container > *:not(.nav) {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    h1 {
        font-size: 24px;
    }
    
    h2 {
        font-size: 18px;
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .search-form input {
        width: 100%;
    }
    
    .action-box {
        max-width: 100%;
    }
    
    div[style*="grid-template-columns: 1fr 1fr"] {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-sm);
    }
    
    h1 {
        font-size: 22px;
    }
}