/* ============================================================
   global.css - CSS Reset, Custom Properties & Base Typography
   ShayariVerse - "Read, Listen, Feel"
   
   This file contains:
   1. Modern CSS Reset (box-sizing, margin reset, smooth scroll)
   2. Custom Properties (spacing, typography, animation tokens)
   3. Fluid Type Scale (clamp-based responsive typography)
   4. Base Element Styles (body, headings, links, images)
   5. Utility Classes (screen-reader only, visually hidden)
   ============================================================ */


/* ======================
   1. MODERN CSS RESET
   ====================== */

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

/* Prevent font-size inflation on mobile */
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  scroll-behavior: smooth;
}

/* Remove default list styles */
ul,
ol {
  list-style: none;
}

/* Set core body defaults */
body {
  min-height: 100dvh;
  font-family: var(--font-ui);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--clr-text-primary);
  background-color: var(--clr-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color var(--duration-normal) var(--ease-smooth),
              color var(--duration-normal) var(--ease-smooth);
}

/* Balanced text wrapping for headings */
h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: 1.2;
}

/* Prevent long words from overflowing */
p, li, figcaption {
  text-wrap: pretty;
  overflow-wrap: break-word;
}

/* Remove built-in form typography */
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* Remove textarea default styling */
textarea {
  resize: vertical;
}

/* Anchor defaults */
a {
  color: var(--clr-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-smooth);
}

a:hover {
  color: var(--clr-accent-hover);
}

a:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Image defaults - prevent layout shift */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Button reset */
button {
  cursor: pointer;
  background: none;
  border: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Remove all animations and transitions for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* ============================
   2. CUSTOM PROPERTIES
   ============================ */

:root {
  /* ---- Spacing Scale ---- */
  --space-3xs: 0.125rem;   /* 2px */
  --space-2xs: 0.1875rem;  /* 3px */
  --space-xs:  0.25rem;    /* 4px */
  --space-sm:  0.5rem;     /* 8px */
  --space-md:  1rem;       /* 16px */
  --space-lg:  1.5rem;     /* 24px */
  --space-xl:  2rem;       /* 32px */
  --space-2xl: 3rem;       /* 48px */
  --space-3xl: 4rem;       /* 64px */
  --space-4xl: 6rem;       /* 96px */

  /* ---- Typography - Font Families ---- */
  --font-shayari: 'Kalam', 'Noto Nastaliq Urdu', 'Noto Sans Devanagari', cursive;
  --font-heading: 'Playfair Display', 'Noto Serif Devanagari', serif;
  --font-ui:      'Poppins', 'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* ---- Typography - Fluid Type Scale (clamp) ---- */
  --text-xs:   clamp(0.6875rem, 0.6rem + 0.25vw, 0.75rem);     /* 11px → 12px */
  --text-sm:   clamp(0.8125rem, 0.75rem + 0.25vw, 0.875rem);    /* 13px → 14px */
  --text-base: clamp(0.9375rem, 0.85rem + 0.35vw, 1.0625rem);   /* 15px → 17px */
  --text-lg:   clamp(1.125rem, 0.95rem + 0.6vw, 1.375rem);      /* 18px → 22px */
  --text-xl:   clamp(1.375rem, 1rem + 1.2vw, 1.875rem);         /* 22px → 30px */
  --text-2xl:  clamp(1.75rem, 1.2rem + 1.8vw, 2.625rem);        /* 28px → 42px */
  --text-hero: clamp(2.25rem, 1.5rem + 3vw, 4rem);              /* 36px → 64px */

  /* ---- Typography - Font Weights ---- */
  --weight-light:    300;
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  /* ---- Animation Timing ---- */
  --ease-smooth:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-elastic: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  --duration-instant: 100ms;
  --duration-fast:    200ms;
  --duration-normal:  400ms;
  --duration-slow:    800ms;
  --duration-glacial: 1200ms;

  /* ---- Layout ---- */
  --max-width:      1280px;
  --max-width-sm:   640px;
  --max-width-md:   960px;

  --header-height:  64px;
  --bottom-nav-h:   64px;
  --audio-player-h: 64px;

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  /* ---- Z-Index Scale ---- */
  --z-base:       1;
  --z-card:       10;
  --z-sticky:     100;
  --z-header:     200;
  --z-overlay:    300;
  --z-modal:      400;
  --z-audio:      500;
  --z-bottom-nav: 600;
  --z-toast:      700;
  --z-max:        9999;
}


/* ============================
   3. BASE ELEMENT STYLES
   ============================ */

/* Headings */
h1 { font-size: var(--text-hero); font-weight: var(--weight-bold); }
h2 { font-size: var(--text-2xl);  font-weight: var(--weight-bold); }
h3 { font-size: var(--text-xl);   font-weight: var(--weight-semibold); }
h4 { font-size: var(--text-lg);   font-weight: var(--weight-semibold); }
h5 { font-size: var(--text-base); font-weight: var(--weight-medium); }
h6 { font-size: var(--text-sm);   font-weight: var(--weight-medium); }

/* Body text */
p {
  font-size: var(--text-base);
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* Small / Caption text */
small,
.text-sm {
  font-size: var(--text-sm);
  color: var(--clr-text-faded);
}

.text-xs {
  font-size: var(--text-xs);
  color: var(--clr-text-faded);
}

/* Shayari text - the star of the show */
.shayari-text {
  font-family: var(--font-shayari);
  font-size: var(--text-xl);
  line-height: 2;
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--clr-text-primary);
  text-shadow: 0 0 40px var(--clr-accent-glow);
  white-space: pre-line;
}

/* Heading font for decorative titles */
.heading-decorative {
  font-family: var(--font-heading);
  letter-spacing: -0.01em;
}

/* Section dividers */
hr {
  border: none;
  height: 1px;
  background: var(--clr-divider);
  margin: var(--space-xl) 0;
}

/* Selection color */
::selection {
  background: var(--clr-accent);
  color: var(--clr-bg-primary);
}

/* Scrollbar styling (Webkit) */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--clr-text-faded);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--clr-text-secondary);
}

/* Firefox scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--clr-text-faded) transparent;
}


/* ============================
   4. LAYOUT UTILITIES
   ============================ */

/* Main content wrapper - prevents content going behind fixed header/nav */
.page-wrapper {
  padding-top: var(--header-height);
  padding-bottom: calc(var(--bottom-nav-h) + var(--audio-player-h) + var(--space-md));
  min-height: 100dvh;
}

/* Centered container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--sm {
  max-width: var(--max-width-sm);
}

.container--md {
  max-width: var(--max-width-md);
}

/* Section spacing */
.section {
  padding-block: var(--space-2xl);
}

.section--hero {
  padding-block: var(--space-3xl) var(--space-2xl);
}


/* ============================
   5. ACCESSIBILITY UTILITIES
   ============================ */

/* Screen-reader only - hidden visually but accessible */
.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;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--clr-accent);
  color: var(--clr-bg-primary);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-sm);
  z-index: var(--z-max);
  transition: top var(--duration-fast) var(--ease-smooth);
}

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

/* Focus-visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
}

/* Remove focus outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}