/* ===================================
   Lightning Booking - Fast Flow CSS
   Design System: Minimal, Efficient
   =================================== */

:root {
    /* Colors */
    --color-primary: #2563EB;
    --color-primary-hover: #1E40AF;
    --color-secondary: #1E40AF;
    --color-accent: #10B981;
    --color-success: #10B981;
    --color-success-light: #D1FAE5;
    --color-error: #EF4444;
    --color-error-light: #FEE2E2;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-muted: #94A3B8;
    --color-border: #E2E8F0;
    --color-border-focus: #2563EB;
    --color-spots-low: #B45309;

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, 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;

    /* Spacing (tight scale) */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 0.75rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;

    /* Border Radius - Standardized */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.10);
    --shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===================================
   Base Styles
   =================================== */

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Skip Link (Accessibility)
   =================================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary, #4A7C8C);
    color: #fff;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 1000;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
}

.back-to-catalog {
    position: fixed;
    top: 1rem;
    left: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #4A7C8C;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid #E8E4DD;
    border-radius: 6px;
    text-decoration: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.2s ease;
}

.back-to-catalog:hover {
    background: #4A7C8C;
    color: white;
    border-color: #4A7C8C;
}

.back-to-catalog:focus {
    outline: 2px solid #4A7C8C;
    outline-offset: 2px;
}

/* ===================================
   Pattern Header
   =================================== */

.pattern-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
}

.pattern-header__container {
    max-width: 800px;
    margin: 0 auto;
}

.pattern-header__badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-xs) var(--space-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.pattern-header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.pattern-header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.pattern-header__meta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.meta-tag {
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
}

/* ===================================
   Demo Container
   =================================== */

.demo-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

/* ===================================
   Booking Section
   =================================== */

.booking-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-md);
}

.booking__header {
    margin-bottom: var(--space-xl);
}

.booking__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.booking__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* ===================================
   Course Cards Grid
   =================================== */

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.course-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
}

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

.course-card:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.course-card.selected {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(37, 99, 235, 0.02) 100%);
}

.course-card.selected::before {
    content: '';
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='10' viewBox='0 0 12 10' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 5L4.5 8.5L11 1.5' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.course-card__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.course-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.3;
}

.course-card__meta {
    display: flex;
    gap: var(--space-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.course-card__date::before {
    content: '📅 ';
    margin-right: var(--space-xs);
}

.course-card__duration::before {
    content: '⏱️ ';
    margin-right: var(--space-xs);
}

.course-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.course-card__price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

.course-card__spots {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.course-card__spots--available {
    background: var(--color-success-light);
    color: var(--color-success);
}

.course-card__spots--low {
    background: #FEF3C7;
    color: var(--color-spots-low);
}

/* ===================================
   Booking Form
   =================================== */

.booking-form-container {
    margin-top: var(--space-2xl);
    animation: slideIn 0.2s ease;
}

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

.booking-form {
    background: var(--color-surface);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.booking-form__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.booking-form__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

.booking-form__close {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
}

.booking-form__close:hover {
    background: var(--color-background);
    color: var(--color-text);
}

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

/* Booking Summary */
.booking-summary {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.booking-summary__item {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    font-size: var(--font-size-sm);
}

.booking-summary__item:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
}

.booking-summary__label {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.booking-summary__value {
    color: var(--color-text);
    font-weight: 600;
}

.booking-summary__item--total {
    padding-top: var(--space-md);
    margin-top: var(--space-sm);
    border-top: 2px solid var(--color-border);
    font-size: var(--font-size-base);
}

.booking-summary__item--total .booking-summary__value {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

/* Form Fields */
.form-field {
    margin-bottom: var(--space-lg);
    position: relative;
}

.form-group {
    position: relative;
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.form-optional {
    font-weight: 400;
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    transition: all 0.15s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-focus);
}

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

.form-input.success {
    border-color: var(--color-success, #10B981);
}

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

.form-group.has-success .form-input {
    border-color: var(--color-success, #10B981);
    position: relative;
}

.form-group.has-success::after {
    content: '✓';
    position: absolute;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-success, #10B981);
    font-weight: 700;
    font-size: 1.25rem;
    pointer-events: none;
}

.form-hint {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.form-error {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: var(--space-sm);
    min-height: 1rem;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    padding: var(--space-lg) var(--space-2xl);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    border: none;
    width: 100%;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

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

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

.btn-primary:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
    transform: none;
}

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

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

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

.btn-link {
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
    text-decoration: underline;
    cursor: pointer;
    transition: color 0.2s ease;
}

.btn-link:hover {
    color: var(--color-primary);
}

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

.btn-icon {
    font-size: 1.2em;
    transition: transform 0.15s ease;
}

.btn-primary:hover .btn-icon {
    transform: translateX(2px);
}

/* Loading State */
.btn-primary.loading .btn-text::after {
    content: '...';
    animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}

/* ===================================
   Success State
   =================================== */

.booking-success {
    text-align: center;
    padding: var(--space-2xl);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.booking-success__icon {
    margin-bottom: var(--space-xl);
    animation: checkmark 0.5s ease;
}

@keyframes checkmark {
    0% {
        transform: scale(0) rotate(-180deg);
    }
    50% {
        transform: scale(1.1) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0);
    }
}

.booking-success__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-success);
    margin-bottom: var(--space-sm);
}

.booking-success__message {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.booking-success__details {
    background: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
    text-align: left;
}

.booking-success__actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 400px;
    margin: 0 auto;
}

/* ===================================
   Accessibility Notes
   =================================== */

.accessibility-notes {
    background: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-top: var(--space-2xl);
}

.accessibility-notes__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.accessibility-notes__list {
    list-style: none;
    display: grid;
    gap: var(--space-md);
}

.accessibility-notes__list li {
    padding-left: var(--space-xl);
    position: relative;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.accessibility-notes__list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

/* ===================================
   Pattern Description
   =================================== */

.pattern-description {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    margin-top: var(--space-2xl);
    box-shadow: var(--shadow-sm);
}

.pattern-description__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.pattern-description__content p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.pattern-description__content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin: var(--space-xl) 0 var(--space-md);
}

.pattern-description__content ul {
    list-style: disc;
    padding-left: var(--space-xl);
    color: var(--color-text-secondary);
}

.pattern-description__content li {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.pattern-description__highlight {
    display: inline-block;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.1);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
}

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

@media (max-width: 768px) {
    .pattern-header {
        padding: var(--space-xl) var(--space-lg);
    }

    .pattern-header__title {
        font-size: var(--font-size-2xl);
    }

    .demo-container {
        padding: var(--space-xl) var(--space-md);
    }

    .booking-section {
        padding: var(--space-xl);
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .booking-form {
        padding: var(--space-lg);
    }
}

/* ===================================
   Reduced Motion
   =================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Hidden Utility
   =================================== */

[hidden] {
    display: none !important;
}