/* ============================================
   OTA COMMISSION LOSS CALCULATOR
   Design System & Global Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ============================================
   CSS VARIABLES & DESIGN TOKENS
   ============================================ */

:root {
    /* Color Palette - Hotel/Travel Vibe */
    --color-primary: hsl(200, 85%, 45%);
    --color-primary-dark: hsl(200, 85%, 35%);
    --color-primary-light: hsl(200, 85%, 95%);

    --color-accent: hsl(340, 82%, 52%);
    --color-accent-dark: hsl(340, 82%, 42%);
    --color-accent-light: hsl(340, 82%, 95%);

    --color-success: hsl(142, 71%, 45%);
    --color-warning: hsl(45, 93%, 47%);
    --color-danger: hsl(0, 84%, 60%);

    --color-neutral-50: hsl(210, 20%, 98%);
    --color-neutral-100: hsl(210, 20%, 95%);
    --color-neutral-200: hsl(210, 16%, 88%);
    --color-neutral-300: hsl(210, 14%, 75%);
    --color-neutral-400: hsl(210, 12%, 60%);
    --color-neutral-500: hsl(210, 10%, 45%);
    --color-neutral-600: hsl(210, 12%, 35%);
    --color-neutral-700: hsl(210, 14%, 25%);
    --color-neutral-800: hsl(210, 16%, 15%);
    --color-neutral-900: hsl(210, 20%, 8%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(200, 85%, 45%) 0%, hsl(220, 85%, 55%) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(340, 82%, 52%) 0%, hsl(20, 82%, 52%) 100%);
    --gradient-hero: linear-gradient(180deg, hsl(210, 20%, 98%) 0%, hsl(200, 40%, 97%) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(200, 85%, 45%, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-neutral-800);
    background: white;
    overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY SYSTEM
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 600;
}

p {
    margin-bottom: var(--space-md);
    color: var(--color-neutral-600);
    font-size: 1.0625rem;
    line-height: 1.7;
}

.text-large {
    font-size: 1.25rem;
    line-height: 1.8;
}

.text-small {
    font-size: 0.875rem;
    line-height: 1.5;
}

.text-xs {
    font-size: 0.75rem;
    line-height: 1.4;
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: 960px;
}

.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

.section-sm {
    padding: var(--space-3xl) 0;
}

.section-lg {
    padding: var(--space-4xl) 0;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (min-width: 768px) {
    .grid-md-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-md-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Flex Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.gap-xl {
    gap: var(--space-xl);
}

/* ============================================
   CARD COMPONENTS
   ============================================ */

.card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: 1px solid var(--color-neutral-100);
}

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

.card-glass {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.card-gradient {
    background: var(--gradient-card);
    backdrop-filter: blur(10px);
}

.card-highlight {
    position: relative;
    overflow: hidden;
}

.card-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

/* ============================================
   BUTTON COMPONENTS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

.btn-primary:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

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

.btn-accent {
    background: var(--gradient-accent);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-accent:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

.btn-xl {
    padding: var(--space-xl) var(--space-3xl);
    font-size: 1.25rem;
    font-weight: 700;
}

.btn-block {
    width: 100%;
}

.btn-subtext {
    display: block;
    font-size: 0.875rem;
    font-weight: 400;
    opacity: 0.9;
    margin-top: var(--space-xs);
}

/* ============================================
   FORM COMPONENTS
   ============================================ */

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-sm);
}

.form-helper {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-neutral-500);
    margin-top: var(--space-xs);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--color-neutral-800);
    background: white;
    border: 2px solid var(--color-neutral-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

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

.form-input::placeholder {
    color: var(--color-neutral-400);
}

/* Range Slider */
.form-range {
    width: 100%;
    height: 8px;
    background: var(--color-neutral-200);
    border-radius: var(--radius-full);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
}

.form-range::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.form-range::-moz-range-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
}

/* Toggle Switch */
.toggle-container {
    display: inline-flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-sm);
    background: var(--color-neutral-100);
    border-radius: var(--radius-full);
}

.toggle-option {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-neutral-600);
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

/* ============================================
   BADGE & CHIP COMPONENTS
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.badge-accent {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.badge-success {
    background: hsl(142, 71%, 95%);
    color: hsl(142, 71%, 35%);
}

.badge-danger {
    background: hsl(0, 84%, 95%);
    color: hsl(0, 84%, 50%);
}

/* Result Chips */
.result-chip {
    padding: var(--space-lg) var(--space-xl);
    background: var(--gradient-accent);
    color: white;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: slideInUp 0.5s ease-out;
}

.result-chip-value {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

.result-chip-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    opacity: 0.95;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   ICON COMPONENTS
   ============================================ */

.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
}

.icon-lg {
    width: 2rem;
    height: 2rem;
}

.icon-xl {
    width: 3rem;
    height: 3rem;
}

.icon-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.animate-fadeIn {
    animation: fadeIn 0.6s ease-out;
}

.animate-slideInUp {
    animation: slideInUp 0.6s ease-out;
}

.animate-slideInDown {
    animation: slideInDown 0.6s ease-out;
}

.animate-scaleIn {
    animation: scaleIn 0.5s ease-out;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-center {
    text-align: center;
}

.text-primary {
    color: var(--color-primary);
}

.text-accent {
    color: var(--color-accent);
}

.text-success {
    color: var(--color-success);
}

.text-danger {
    color: var(--color-danger);
}

.bg-gradient {
    background: var(--gradient-hero);
}

.bg-neutral {
    background: var(--color-neutral-50);
}

.mt-xs {
    margin-top: var(--space-xs);
}

.mt-sm {
    margin-top: var(--space-sm);
}

.mt-md {
    margin-top: var(--space-md);
}

.mt-lg {
    margin-top: var(--space-lg);
}

.mt-xl {
    margin-top: var(--space-xl);
}

.mt-2xl {
    margin-top: var(--space-2xl);
}

.mt-3xl {
    margin-top: var(--space-3xl);
}

.mb-xs {
    margin-bottom: var(--space-xs);
}

.mb-sm {
    margin-bottom: var(--space-sm);
}

.mb-md {
    margin-bottom: var(--space-md);
}

.mb-lg {
    margin-bottom: var(--space-lg);
}

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

.mb-2xl {
    margin-bottom: var(--space-2xl);
}

.mb-3xl {
    margin-bottom: var(--space-3xl);
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */

@media (max-width: 767px) {
    .section {
        padding: var(--space-3xl) 0;
    }

    .container {
        padding: 0 var(--space-md);
    }

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

    .btn-xl {
        padding: var(--space-lg) var(--space-2xl);
        font-size: 1.125rem;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

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

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

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .no-print {
        display: none !important;
    }
}