/**
 * Austin Public Library - PIN Reset Application
 * Styles based on City of Austin Official Brand Guidelines
 * 
 * @version 3.0.0
 * @author Alex Nguyen
 * @page assets/css/styles.css
 */

/* =============================================================================
   CSS Custom Properties (Design Tokens)
   ============================================================================= */
:root {
    /* City of Austin Official Palette */
    --coa-blue: #44499C;
    --coa-blue-dark: #22254E;
    --coa-blue-light: #dcf2fd;
    
    --coa-green: #009F4D;
    --coa-green-dark: #005027;
    --coa-green-light: #dff0e3;
    --coa-green-compliant: #008743;
    
    /* Neutrals */
    --coa-white: #f7f6f5;
    --coa-gray-light: #C6C5C4;
    --coa-gray: #636262;
    --coa-black: #000000;
    
    /* Extended Palette */
    --coa-red: #F83125;
    --coa-orange: #FF8F00;
    --coa-yellow: #FFC600;
    --coa-cyan: #009CDE;
    
    /* Functional Colors */
    --color-primary: var(--coa-green-compliant);
    --color-primary-dark: var(--coa-green-dark);
    --color-primary-light: var(--coa-green-light);
    --color-secondary: var(--coa-blue);
    --color-secondary-dark: var(--coa-blue-dark);
    
    --color-success: var(--coa-green-compliant);
    --color-error: var(--coa-red);
    --color-warning: var(--coa-orange);
    --color-info: var(--coa-cyan);
    
    --color-text: #333333;
    --color-text-muted: var(--coa-gray);
    --color-background: var(--coa-white);
    --color-surface: #ffffff;
    --color-border: var(--coa-gray-light);
    
    /* Typography */
    --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* =============================================================================
   Base Styles & Reset
   ============================================================================= */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4 {
    margin: 0 0 var(--space-md) 0;
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

p {
    margin: 0 0 var(--space-md) 0;
}

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

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

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* =============================================================================
   Layout
   ============================================================================= */
.page-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    min-height: calc(100vh - 180px);
}

.container {
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
}

/* =============================================================================
   Header
   ============================================================================= */
.site-header {
    background-color: var(--coa-blue);
    padding: var(--space-md) var(--space-lg);
    box-shadow: var(--shadow-md);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-logo {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
}

.header-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.header-title {
    color: #ffffff;
}

.header-title h1 {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #ffffff;
}

.header-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    color: #ffffff;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.language-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
}

.language-btn:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

.language-icon {
    width: 20px;
    height: 20px;
}

/* =============================================================================
   Card Component
   ============================================================================= */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--space-xl) var(--space-xl) var(--space-md);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.card-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
}

.card-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.card-title {
    color: var(--coa-green-dark);
    margin-bottom: var(--space-xs);
}

.card-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    text-align: left;
    margin: 0;
}

.card-body {
    padding: var(--space-xl);
}

/* =============================================================================
   Form Styles
   ============================================================================= */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    pointer-events: none;
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    padding-left: calc(var(--space-md) * 2 + 20px);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:hover {
    border-color: var(--coa-gray);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 159, 77, 0.15);
}

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

.form-input.has-error {
    border-color: var(--color-error);
}

.form-input.has-error:focus {
    box-shadow: 0 0 0 3px rgba(248, 49, 37, 0.15);
}

/* Field error message */
.field-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--space-xs);
    min-height: 1.25rem;
}

.field-error:empty {
    display: none;
}

/* Password visibility toggle */
.password-toggle {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    padding: var(--space-xs);
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    border-radius: var(--radius-sm);
}

.password-toggle:hover {
    color: var(--color-text);
}

.password-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.form-help {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.form-error {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

/* =============================================================================
   Button Styles
   ============================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: var(--space-lg) var(--space-xl);
    font-size: var(--font-size-lg);
}

.btn-primary {
    color: #ffffff;
    background-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(1px);
}

.btn-secondary {
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--coa-white);
    border-color: var(--coa-gray);
}

.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .btn-text-content {
    opacity: 0;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* =============================================================================
   Alert Messages
   ============================================================================= */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    border-left: 4px solid;
}

.alert-heading {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
}

.alert-text {
    margin: 0;
    line-height: var(--line-height-relaxed);
}

.alert-text a {
    font-weight: var(--font-weight-medium);
}

.alert-success {
    background-color: var(--coa-green-light);
    border-color: var(--color-success);
    color: var(--coa-green-dark);
    text-align: left;
}

.alert-success .alert-heading {
    color: var(--color-success);
}

.alert-error {
    background-color: #fef2f2;
    border-color: var(--color-error);
    color: #991b1b;
    text-align: left;
}

.alert-error .alert-heading {
    color: var(--color-error);
}

.alert-warning {
    background-color: #fffbeb;
    border-color: var(--color-warning);
    color: #92400e;
}

.alert-info {
    background-color: var(--coa-blue-light);
    border-color: var(--color-info);
    color: var(--coa-blue-dark);
}

/* =============================================================================
   Footer
   ============================================================================= */
.site-footer {
    background-color: var(--coa-blue-dark);
    color: #ffffff;
    padding: var(--space-lg) var(--space-xl);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-contact {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

.footer-contact a {
    color: #ffffff;
    text-decoration: underline;
}

.footer-copyright {
    font-size: var(--font-size-xs);
    opacity: 0.7;
    margin: 0;
}

/* =============================================================================
   Password Requirements
   ============================================================================= */
.password-requirements {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background-color: var(--coa-blue-light);
    border-radius: var(--radius-md);
}

.password-requirements-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--coa-blue-dark);
    margin-bottom: var(--space-sm);
}

.requirements-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.requirements-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    padding: var(--space-xs) 0;
    color: var(--color-text-muted);
}

.requirements-list li.valid {
    color: var(--color-success);
}

.requirement-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* =============================================================================
   Utilities
   ============================================================================= */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-md);
}

/* =============================================================================
   Responsive Design
   ============================================================================= */
@media (max-width: 640px) {
    html {
        font-size: 15px;
    }
    
    .site-header {
        padding: var(--space-sm) var(--space-md);
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .header-brand {
        flex-direction: column;
        text-align: center;
    }
    
    .header-title h1 {
        font-size: var(--font-size-base);
    }
    
    .main-content {
        padding: var(--space-md);
        min-height: auto;
    }
    
    .card-header {
        padding: var(--space-lg) var(--space-md) var(--space-md);
    }
    
    .card-body {
        padding: var(--space-lg) var(--space-md);
    }
    
    .card-logo {
        width: 60px;
        height: 60px;
    }
    
    .card-title {
        font-size: var(--font-size-xl);
    }
    
    .btn-lg {
        padding: var(--space-md) var(--space-lg);
        font-size: var(--font-size-base);
    }
    
    .site-footer {
        padding: var(--space-md);
    }
}

@media (max-width: 400px) {
    html {
        font-size: 14px;
    }
    
    .form-input {
        padding: var(--space-sm) var(--space-md);
        padding-left: calc(var(--space-md) + 24px);
    }
}

/* =============================================================================
   Accessibility Support
   ============================================================================= */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
    }
    
    .form-input {
        border-width: 3px;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}