/* Global Styles */
html, body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-body-color);
    color: var(--body-color-text);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-normal);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: var(--font-md);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    gap: 0.5rem;
}

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

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--button-primary-hover);
    border-color: var(--button-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--button-secondary-hover);
    border-color: var(--button-secondary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover, .btn-success:focus {
    background-color: var(--success-hover);
    border-color: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-warning:hover, .btn-warning:focus {
    background-color: var(--warning-hover);
    border-color: var(--warning-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover, .btn-danger:focus {
    background-color: var(--danger-hover);
    border-color: var(--danger-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-link {
    background-color: transparent;
    border-color: transparent;
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
}

.btn-link:hover, .btn-link:focus {
    color: var(--primary-hover);
    text-decoration: underline;
    background-color: transparent;
    border-color: transparent;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: var(--font-sm);
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--font-lg);
    border-radius: var(--radius-lg);
}

/* Forms */
.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: var(--font-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.form-control:focus {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

.form-label {
    margin-bottom: 0.5rem;
    font-size: var(--font-md);
    color: var(--text-secondary);
    font-weight: 500;
}

.form-select {
    display: block;
    width: 100%;
    padding: 0.5rem 2.25rem 0.5rem 0.75rem;
    font-size: var(--font-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    appearance: none;
    transition: var(--transition-normal);
}

.form-select:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

.form-check {
    display: block;
    min-height: 1.5rem;
    padding-left: 1.5rem;
    margin-bottom: 0.125rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin-top: 0.25rem;
    margin-left: -1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    appearance: none;
    transition: var(--transition-normal);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-label {
    color: var(--text-secondary);
    cursor: pointer;
}

/* Cards */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: var(--bg-secondary);
    background-clip: border-box;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    padding: 1rem;
    margin-bottom: 0;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: calc(var(--radius-lg) - 1px);
    border-top-right-radius: calc(var(--radius-lg) - 1px);
}

.card-body {
    flex: 1 1 auto;
    padding: 1rem;
}

.card-footer {
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    border-bottom-right-radius: calc(var(--radius-lg) - 1px);
    border-bottom-left-radius: calc(var(--radius-lg) - 1px);
}

/* Alerts */
.alert {
    position: relative;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

/* Utilities */
.text-primary { color: var(--primary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-muted { color: var(--text-muted) !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded-md { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 1000;
    background-color: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.language-switcher .btn-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border-radius: var(--radius-sm);
}

.language-switcher .btn-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-tertiary);
}

.language-switcher .btn-link.active {
    color: var(--primary-color);
    font-weight: 600;
    background-color: var(--bg-tertiary);
}

.language-switcher .separator {
    color: var(--text-secondary);
}

@media (max-width: 576px) {
    .language-switcher {
        top: 0.5rem;
        right: 0.5rem;
    }
}

/* Loading Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-border {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: text-bottom;
    border: 0.25rem solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

@keyframes spinner-border {
    to { transform: rotate(360deg); }
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

/* Responsive utilities */
@media (max-width: 768px) {
    h1 { font-size: 1.875rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }
    h5 { font-size: 1rem; }
    h6 { font-size: 0.875rem; }
    
    .btn {
        padding: 0.375rem 0.75rem;
    }
    
    .btn-lg {
        padding: 0.5rem 1rem;
    }
}