/**
 * Nanpure Landing Page - Theme System
 * 
 * This theming scheme is designed to match the mobile app's design system
 * while providing web-specific utilities for the landing page.
 * 
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */

:root {
    /* ---- Color Palette (Light Theme) ---- */

    /* Background Colors */
    --color-background-main: hsl(0, 0%, 90%);
    --color-background-contrast-text: hsl(0, 0%, 5%);
    --color-on-background-main: hsl(0, 0%, 95%);
    --color-on-background-contrast-text: hsl(0, 0%, 5%);

    /* Primary Colors (Warm Orange) */
    --color-primary-50: hsl(15, 78%, 95%);
    --color-primary-100: hsl(15, 78%, 90%);
    --color-primary-200: hsl(15, 78%, 85%);
    --color-primary-300: hsl(15, 78%, 75%);
    --color-primary-400: hsl(15, 78%, 65%);
    --color-primary-main: hsl(15, 78%, 56%);
    --color-primary-600: hsl(15, 78%, 45%);
    --color-primary-dark: hsl(15, 78%, 40%);
    --color-primary-800: hsl(15, 78%, 35%);
    --color-primary-900: hsl(15, 78%, 30%);
    --color-primary-light-200: hsl(15, 78%, 85%);
    --color-primary-light-100: hsl(15, 78%, 90%);
    --color-primary-light-50: hsl(15, 78%, 95%);
    --color-primary-contrast-text: hsl(0, 0%, 95%);

    /* Secondary Colors (Rose/Pink) */
    --color-secondary-50: hsl(338, 49%, 95%);
    --color-secondary-100: hsl(338, 49%, 90%);
    --color-secondary-200: hsl(338, 49%, 85%);
    --color-secondary-300: hsl(338, 49%, 75%);
    --color-secondary-400: hsl(338, 49%, 65%);
    --color-secondary-main: hsl(338, 49%, 43%);
    --color-secondary-light: hsl(338, 49%, 90%);
    --color-secondary-dark: hsl(338, 49%, 35%);
    --color-secondary-contrast-text: hsl(0, 0%, 95%);

    /* Success Colors (Green) */
    --color-success-main: hsl(120, 39%, 50%);
    --color-success-light: hsl(120, 39%, 76%);
    --color-success-dark: hsl(120, 39%, 34%);
    --color-success-contrast-text: hsl(0, 0%, 95%);

    /* Danger Colors (Red) */
    --color-danger-main: hsl(4, 90%, 63%);
    --color-danger-light: hsl(4, 90%, 80%);
    --color-danger-light-50: hsl(4, 90%, 85%);
    --color-danger-dark: hsl(4, 90%, 48%);
    --color-danger-contrast-text: hsl(0, 0%, 95%);

    /* Gray Scale */
    --color-gray-50: hsl(0, 0%, 98%);
    --color-gray-100: hsl(0, 0%, 96%);
    --color-gray-200: hsl(0, 0%, 94%);
    --color-gray-300: hsl(0, 0%, 86%);
    --color-gray-400: hsl(0, 0%, 74%);
    --color-gray-500: hsl(0, 0%, 62%);
    --color-gray-600: hsl(0, 0%, 50%);
    --color-gray-700: hsl(0, 0%, 45%);
    --color-gray-800: hsl(0, 0%, 38%);
    --color-gray-900: hsl(0, 0%, 26%);

    /* Semantic Gray */
    --color-gray-main: hsl(0, 0%, 62%);
    --color-gray-light: hsl(0, 0%, 94%);
    --color-gray-dark: hsl(0, 0%, 45%);
    --color-gray-contrast-text: hsl(0, 0%, 5%);

    /* Custom Colors */
    --color-accent: hsl(280, 65%, 60%);
    --color-info: hsl(200, 80%, 50%);
    --color-amber: hsl(38, 92%, 50%);
    --color-teal: hsl(174, 62%, 47%);

    /* Black & White */
    --color-black: hsl(0, 0%, 5%);
    --color-white: hsl(0, 0%, 95%);

    /* ---- Typography ---- */

    /* Font Families */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-family-heading: var(--font-family-primary);
    --font-family-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', Consolas, 'Liberation Mono', Menlo, Courier, monospace;

    /* Font Sizes */
    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */
    --font-size-6xl: 3.75rem;
    /* 60px */
    --font-size-7xl: 4.5rem;
    /* 72px */

    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Line Heights */
    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tighter: -0.05em;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;

    /* ---- Spacing ---- */
    --spacing-0: 0;
    --spacing-1: 0.25rem;
    /* 4px */
    --spacing-2: 0.5rem;
    /* 8px */
    --spacing-3: 0.75rem;
    /* 12px */
    --spacing-4: 1rem;
    /* 16px */
    --spacing-5: 1.25rem;
    /* 20px */
    --spacing-6: 1.5rem;
    /* 24px */
    --spacing-8: 2rem;
    /* 32px */
    --spacing-10: 2.5rem;
    /* 40px */
    --spacing-12: 3rem;
    /* 48px */
    --spacing-16: 4rem;
    /* 64px */
    --spacing-20: 5rem;
    /* 80px */
    --spacing-24: 6rem;
    /* 96px */
    --spacing-32: 8rem;
    /* 128px */

    /* ---- Border Radius ---- */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    /* 2px */
    --radius-default: 0.25rem;
    /* 4px */
    --radius-md: 0.375rem;
    /* 6px */
    --radius-lg: 0.5rem;
    /* 8px */
    --radius-xl: 0.75rem;
    /* 12px */
    --radius-2xl: 1rem;
    /* 16px */
    --radius-3xl: 1.5rem;
    /* 24px */
    --radius-full: 9999px;

    /* ---- Shadows ---- */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

    /* Primary colored shadows */
    --shadow-primary-sm: 0 2px 8px -2px hsla(15, 78%, 56%, 0.3);
    --shadow-primary-md: 0 4px 14px -3px hsla(15, 78%, 56%, 0.4);
    --shadow-primary-lg: 0 10px 25px -5px hsla(15, 78%, 56%, 0.4);

    /* ---- Transitions ---- */
    --transition-duration-fast: 150ms;
    --transition-duration-normal: 300ms;
    --transition-duration-slow: 500ms;
    --transition-timing-default: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-timing-ease-in: cubic-bezier(0.4, 0, 1, 1);
    --transition-timing-ease-out: cubic-bezier(0, 0, 0.2, 1);
    --transition-timing-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-timing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ---- Z-Index Scale ---- */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;

    /* ---- Container Widths ---- */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;

    /* ---- Component-Specific Tokens ---- */

    /* Buttons */
    --button-height-sm: 2rem;
    --button-height-md: 2.5rem;
    --button-height-lg: 3rem;
    --button-padding-x-sm: var(--spacing-3);
    --button-padding-x-md: var(--spacing-4);
    --button-padding-x-lg: var(--spacing-6);
    --button-border-radius: var(--radius-lg);

    /* Cards */
    --card-background: var(--color-on-background-main);
    --card-border-radius: var(--radius-xl);
    --card-padding: var(--spacing-6);
    --card-shadow: var(--shadow-md);

    /* Navigation */
    --nav-height: 4rem;
    --nav-background: hsla(0, 0%, 95%, 0.9);
    --nav-backdrop-blur: blur(12px);

    /* Hero Section */
    --hero-gradient: linear-gradient(135deg, var(--color-primary-light-50) 0%, var(--color-on-background-main) 50%, var(--color-secondary-100) 100%);

    /* Feature Cards */
    --feature-icon-size: 3rem;
    --feature-icon-background: var(--color-primary-light-50);
    --feature-icon-color: var(--color-primary-main);

    /* Raised Button */
    --button-raise-offset: 4px;
    --button-raise-color-primary: var(--color-primary-dark);
    --button-raise-color-secondary: var(--color-secondary-dark);
}

/* ============================================
   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-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-background-contrast-text);
    background-color: var(--color-background-main);
}

/* ============================================
   Utility Classes
   ============================================ */

/* Typography */
.text-xs {
    font-size: var(--font-size-xs);
}

.text-sm {
    font-size: var(--font-size-sm);
}

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

.text-lg {
    font-size: var(--font-size-lg);
}

.text-xl {
    font-size: var(--font-size-xl);
}

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

.text-3xl {
    font-size: var(--font-size-3xl);
}

.text-4xl {
    font-size: var(--font-size-4xl);
}

.text-5xl {
    font-size: var(--font-size-5xl);
}

.text-6xl {
    font-size: var(--font-size-6xl);
}

.font-light {
    font-weight: var(--font-weight-light);
}

.font-normal {
    font-weight: var(--font-weight-normal);
}

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

.font-semibold {
    font-weight: var(--font-weight-semibold);
}

.font-bold {
    font-weight: var(--font-weight-bold);
}

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

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

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

/* Colors */
.text-primary {
    color: var(--color-primary-main);
}

.text-secondary {
    color: var(--color-secondary-main);
}

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

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

.text-gray {
    color: var(--color-gray-main);
}

.text-muted {
    color: var(--color-gray-dark);
}

.bg-primary {
    background-color: var(--color-primary-main);
}

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

.bg-secondary {
    background-color: var(--color-secondary-main);
}

.bg-success {
    background-color: var(--color-success-main);
}

.bg-danger {
    background-color: var(--color-danger-main);
}

.bg-surface {
    background-color: var(--color-on-background-main);
}

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

/* Container */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
}

@media (min-width: 640px) {
    .container {
        max-width: var(--container-sm);
    }
}

@media (min-width: 768px) {
    .container {
        max-width: var(--container-md);
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: var(--container-lg);
    }
}

@media (min-width: 1280px) {
    .container {
        max-width: var(--container-xl);
    }
}

/* ============================================
   Component Styles
   ============================================ */

/* Buttons - Raised / Push-in style */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    height: var(--button-height-md);
    padding: 0 var(--button-padding-x-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--button-border-radius);
    border: none;
    cursor: pointer;
    text-decoration: none;
    position: relative;
    transition: filter var(--transition-duration-fast) var(--transition-timing-default);
    transform: translateY(0);
    user-select: none;
}

.btn-sm {
    height: var(--button-height-sm);
    padding: 0 var(--button-padding-x-sm);
    font-size: var(--font-size-sm);
}

.btn-lg {
    height: var(--button-height-lg);
    padding: 0 var(--button-padding-x-lg);
    font-size: var(--font-size-lg);
}

/* Primary raised button */
.btn-primary {
    background-color: var(--color-primary-main);
    color: var(--color-primary-contrast-text);
    box-shadow: 0 var(--button-raise-offset) 0 0 var(--color-primary-800),
                0 calc(var(--button-raise-offset) + 2px) 6px 0 hsla(15, 78%, 30%, 0.3);
    transform: translateY(0);
}

.btn-primary:hover {
    filter: brightness(1.05);
}

.btn-primary:active {
    box-shadow: 0 1px 0 0 var(--color-primary-800),
                0 1px 3px 0 hsla(15, 78%, 30%, 0.2);
    transform: translateY(calc(var(--button-raise-offset) - 1px));
}

/* Secondary raised button */
.btn-secondary {
    background-color: var(--color-secondary-main);
    color: var(--color-secondary-contrast-text);
    box-shadow: 0 var(--button-raise-offset) 0 0 var(--color-secondary-dark),
                0 calc(var(--button-raise-offset) + 2px) 6px 0 hsla(338, 49%, 25%, 0.3);
    transform: translateY(0);
}

.btn-secondary:hover {
    filter: brightness(1.05);
}

.btn-secondary:active {
    box-shadow: 0 1px 0 0 var(--color-secondary-dark),
                0 1px 3px 0 hsla(338, 49%, 25%, 0.2);
    transform: translateY(calc(var(--button-raise-offset) - 1px));
}

/* Outline raised button */
.btn-outline {
    background-color: var(--color-on-background-main);
    border: 2px solid var(--color-primary-main);
    color: var(--color-primary-main);
    box-shadow: 0 var(--button-raise-offset) 0 0 var(--color-gray-400),
                0 calc(var(--button-raise-offset) + 2px) 6px 0 hsla(0, 0%, 50%, 0.2);
    transform: translateY(0);
}

.btn-outline:hover {
    background-color: var(--color-primary-light-50);
}

.btn-outline:active {
    box-shadow: 0 1px 0 0 var(--color-gray-400),
                0 1px 3px 0 hsla(0, 0%, 50%, 0.15);
    transform: translateY(calc(var(--button-raise-offset) - 1px));
}

/* Ghost button (no raise) */
.btn-ghost {
    background-color: transparent;
    color: var(--color-primary-main);
}

.btn-ghost:hover {
    background-color: var(--color-primary-light-50);
}

/* Cards */
.card {
    background-color: var(--card-background);
    border-radius: var(--card-border-radius);
    padding: var(--card-padding);
    box-shadow: var(--card-shadow);
}

.card-hover {
    transition: transform var(--transition-duration-normal) var(--transition-timing-default),
        box-shadow var(--transition-duration-normal) var(--transition-timing-default);
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--nav-background);
    backdrop-filter: var(--nav-backdrop-blur);
    -webkit-backdrop-filter: var(--nav-backdrop-blur);
    z-index: var(--z-index-sticky);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-gray-light);
}

/* Hero Section */
.hero {
    background: var(--hero-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-main);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-4);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-main);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-8);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-6xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-2xl);
    }
}

/* Feature Section */
.feature-icon {
    width: var(--feature-icon-size);
    height: var(--feature-icon-size);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--feature-icon-background);
    color: var(--feature-icon-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-4);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-background-contrast-text);
    margin-bottom: var(--spacing-2);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-main);
    line-height: var(--line-height-relaxed);
}

/* App Store Badges */
.app-badges {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.app-badge {
    height: 48px;
    transition: transform var(--transition-duration-fast) var(--transition-timing-default);
}

.app-badge:hover {
    transform: scale(1.05);
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.phone-frame {
    background: var(--color-gray-900);
    border-radius: var(--radius-3xl);
    padding: var(--spacing-2);
    box-shadow: var(--shadow-2xl);
}

.phone-screen {
    border-radius: calc(var(--radius-3xl) - var(--spacing-2));
    overflow: hidden;
    background: var(--color-on-background-main);
}

/* Section Spacing */
.section {
    padding: var(--spacing-20) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-main);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-12);
}

/* Footer */
.footer {
    background-color: var(--color-on-background-main);
    padding: var(--spacing-12) 0;
    border-top: 1px solid var(--color-gray-light);
}

.footer-links {
    display: flex;
    gap: var(--spacing-6);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-gray-main);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-duration-fast) var(--transition-timing-default);
}

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

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

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

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.animate-fade-in {
    animation: fadeIn var(--transition-duration-normal) var(--transition-timing-default);
}

.animate-fade-in-up {
    animation: fadeInUp var(--transition-duration-normal) var(--transition-timing-default);
}

.animate-fade-in-down {
    animation: fadeInDown var(--transition-duration-normal) var(--transition-timing-default);
}

.animate-slide-in-left {
    animation: slideInLeft var(--transition-duration-normal) var(--transition-timing-default);
}

.animate-slide-in-right {
    animation: slideInRight var(--transition-duration-normal) var(--transition-timing-default);
}

.animate-pulse {
    animation: pulse 2s var(--transition-timing-ease-in-out) infinite;
}

.animate-float {
    animation: float 3s var(--transition-timing-ease-in-out) infinite;
}

/* Animation delays */
.delay-100 {
    animation-delay: 100ms;
}

.delay-200 {
    animation-delay: 200ms;
}

.delay-300 {
    animation-delay: 300ms;
}

.delay-400 {
    animation-delay: 400ms;
}

.delay-500 {
    animation-delay: 500ms;
}