/* =============================================================================
   Canadian Address Correction Tool - Styles
   ============================================================================= */

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

:root {
    /* Colors */
    --primary: #dc2626;
    --primary-hover: #b91c1c;
    --primary-light: #fef2f2;

    --confidence-high: #16a34a;
    --confidence-high-bg: #f0fdf4;
    --confidence-medium: #ca8a04;
    --confidence-medium-bg: #fefce8;
    --confidence-low: #dc2626;
    --confidence-low-bg: #fef2f2;

    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;

    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;

    --border: #e5e7eb;
    --border-focus: #dc2626;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);

    /* Spacing */
    --container-max: 600px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Transitions */
    --transition: 150ms ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* =============================================================================
   Layout
   ============================================================================= */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

main {
    flex: 1;
}

footer {
    text-align: center;
    padding-top: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* =============================================================================
   Input Section
   ============================================================================= */

.input-section {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-lg);
}

.input-section label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.input-wrapper textarea {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: 4rem;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    resize: none;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input-wrapper textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.char-count {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Primary Button */
#correct-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background-color: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
}

#correct-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

#correct-btn:active:not(:disabled) {
    transform: scale(0.98);
}

#correct-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =============================================================================
   Error Message
   ============================================================================= */

.error-message {
    background-color: var(--confidence-low-bg);
    border: 1px solid var(--confidence-low);
    color: var(--confidence-low);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

/* =============================================================================
   Result Section
   ============================================================================= */

.result-section {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.result-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

/* Confidence Badge */
.confidence-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.875rem;
}

.confidence-badge.confidence-high {
    background-color: var(--confidence-high-bg);
    color: var(--confidence-high);
}

.confidence-badge.confidence-medium {
    background-color: var(--confidence-medium-bg);
    color: var(--confidence-medium);
}

.confidence-badge.confidence-low {
    background-color: var(--confidence-low-bg);
    color: var(--confidence-low);
}

/* Result Card */
.result-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.result-card label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.address-output {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    margin-bottom: var(--spacing-md);
}

.address-output span {
    font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
    font-size: 0.95rem;
    font-weight: 500;
    word-break: break-word;
}

.copy-btn {
    flex-shrink: 0;
    padding: var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.copy-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.postal-code-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.postal-code-row label {
    margin-bottom: 0;
}

.postal-code {
    font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
}

/* Corrections List */
.corrections-section {
    margin-bottom: var(--spacing-md);
}

.corrections-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.corrections-section ul {
    list-style: none;
}

.corrections-section li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.corrections-section li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--confidence-high);
}

/* No Match Warning */
.no-match-warning {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--confidence-medium-bg);
    border: 1px solid var(--confidence-medium);
    border-radius: var(--radius-md);
    color: var(--confidence-medium);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.no-match-warning svg {
    flex-shrink: 0;
}

/* Result Actions */
.result-actions {
    display: flex;
    gap: var(--spacing-md);
}

.btn-secondary {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

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

/* =============================================================================
   Toast Notification
   ============================================================================= */

.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--text-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.error {
    background-color: var(--confidence-low);
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    header h1 {
        font-size: 1.5rem;
    }

    .input-section,
    .result-section {
        padding: var(--spacing-md);
    }

    .address-output {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }

    .copy-btn {
        align-self: flex-end;
    }
}