/* ========================================================================== 
   Variables
   ========================================================================== */

:root {
  /* Color Palette - Nature-inspired, calming greens and earth tones */
  --color-bg: #f5f7f4; /* soft, light background */
  --color-surface: #ffffff; /* cards, panels */
  --color-text: #1e2520; /* primary body text */
  --color-text-muted: #5c6a61; /* secondary text */

  --color-primary: #2e7d4f; /* main forest green */
  --color-primary-soft: #e0f1e6; /* subtle primary tint */
  --color-primary-dark: #205a39; /* darker for hover/active */

  --color-success: #2e7d4f; /* aligned with primary for success */
  --color-warning: #f2a93b; /* warm amber for warnings */
  --color-danger: #c7463c; /* muted red for errors */

  --color-border-subtle: #d2ddd4; /* light borders/dividers */
  --color-border-strong: #8aa392; /* stronger accents */

  /* Neutral Grays (earthy-leaning) */
  --gray-50: #f8faf8;
  --gray-100: #edf1ee;
  --gray-200: #dfe6e0;
  --gray-300: #c8d3cb;
  --gray-400: #a7b7ac;
  --gray-500: #879588;
  --gray-600: #6b756a;
  --gray-700: #50584f;
  --gray-800: #363c35;
  --gray-900: #1f241f;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* Base font sizes (responsive-friendly scale) */
  --font-size-xs: 0.75rem;  /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem;   /* 16px */
  --font-size-md: 1.0625rem; /* 17px, slightly larger for readability */
  --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 */

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-7: 1.75rem;  /* 28px */
  --space-8: 2rem;     /* 32px */
  --space-9: 2.5rem;   /* 40px */
  --space-10: 3rem;    /* 48px */
  --space-12: 3.5rem;  /* 56px */
  --space-14: 4rem;    /* 64px */
  --space-16: 4.5rem;  /* 72px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows - soft and natural, not too harsh */
  --shadow-xs: 0 1px 2px rgba(15, 23, 18, 0.06);
  --shadow-sm: 0 1px 3px rgba(15, 23, 18, 0.08),
    0 1px 2px rgba(15, 23, 18, 0.04);
  --shadow-md: 0 4px 12px rgba(13, 35, 23, 0.12);
  --shadow-lg: 0 10px 30px rgba(10, 30, 20, 0.18);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 300ms ease-out;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding-x: var(--space-4);
}

/* Media-query driven font-size tweaks for larger screens */
@media (min-width: 768px) {
  :root {
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2.125rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.25rem;
  }
}

/* ========================================================================== 
   Reset / Normalize
   ========================================================================== */

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
dl, dd {
  margin: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

button {
  background: none;
  border: none;
  padding: 0;
}

textarea {
  resize: vertical;
}

/* Remove default link underline; will define base style later */
a {
  text-decoration: none;
  color: inherit;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  background-color: var(--color-bg);
  color: var(--color-text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

/* Headings - modern, trustworthy hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

h6 {
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

p {
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

/* Links - subtle, trustworthy emphasis using primary green */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-normal),
    opacity var(--transition-fast);
}

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

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

/* Lists */
ul,
ol {
  padding-left: 1.25rem;
  margin: 0 0 var(--space-3);
}

/* Blockquotes */
blockquote {
  margin: 0 0 var(--space-4);
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-primary-soft);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ========================================================================== 
   Accessibility & Motion
   ========================================================================== */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

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

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

/* ========================================================================== 
   Layout Utilities
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* Flexbox helpers */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-row {
  flex-direction: row;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

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

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

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

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

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

.gap-xs {
  gap: var(--space-2);
}

.gap-sm {
  gap: var(--space-3);
}

.gap-md {
  gap: var(--space-4);
}

.gap-lg {
  gap: var(--space-6);
}

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.grid-3-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

@media (max-width: 768px) {
  .grid-2-cols,
  .grid-3-cols {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Spacing utilities (margin & padding, a few common ones) */
.mt-0 { margin-top: 0 !important; }
.mt-xs { margin-top: var(--space-2) !important; }
.mt-sm { margin-top: var(--space-3) !important; }
.mt-md { margin-top: var(--space-4) !important; }
.mt-lg { margin-top: var(--space-6) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-xs { margin-bottom: var(--space-2) !important; }
.mb-sm { margin-bottom: var(--space-3) !important; }
.mb-md { margin-bottom: var(--space-4) !important; }
.mb-lg { margin-bottom: var(--space-6) !important; }

.py-section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

@media (min-width: 1024px) {
  .py-section {
    padding-top: var(--space-14);
    padding-bottom: var(--space-14);
  }
}

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

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

/* ========================================================================== 
   Components
   ========================================================================== */

/* Buttons - primary, secondary, subtle variants */

.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-dark);
  --btn-color: #ffffff;
  --btn-border-color: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;

  padding: 0.6rem 1.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--btn-border-color);

  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: none;

  cursor: pointer;
  background-color: var(--btn-bg);
  color: var(--btn-color);

  transition: background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: var(--btn-bg-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.button:disabled,
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
  transform: none;
}

.button--secondary {
  --btn-bg: #ffffff;
  --btn-bg-hover: var(--gray-100);
  --btn-color: var(--color-primary);
  --btn-border-color: var(--color-border-subtle);
}

.button--ghost {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(46, 125, 79, 0.06);
  --btn-color: var(--color-primary-dark);
  --btn-border-color: transparent;
}

.button--danger {
  --btn-bg: var(--color-danger);
  --btn-bg-hover: #a0362e;
  --btn-color: #ffffff;
  --btn-border-color: transparent;
}

.button:focus-visible,
button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
input[type="reset"]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Inputs & Textareas - consistent, calm styling */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.4;

  transition: border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal);
}

input::placeholder,
textarea::placeholder {
  color: var(--gray-500);
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

input:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--gray-100);
  cursor: not-allowed;
}

/* Checkboxes & radios (minimal normalization; custom styles can extend) */
input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--color-primary);
}

/* Card component - used for campaigns, stats, content blocks */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  padding: var(--space-5);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-normal),
    transform var(--transition-normal),
    border-color var(--transition-normal);
}

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

.card-header {
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.card-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.card-body {
  color: var(--color-text);
}

.card-footer {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

/* Tag / Pill - for campaign statuses, tree counts, etc. */

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.7rem;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-full);
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Progress bar - for planted trees, campaign progress */

.progress {
  width: 100%;
  background-color: var(--gray-100);
  border-radius: var(--radius-full);
  overflow: hidden;
  height: 0.6rem;
}

.progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, #58a96f 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* Alert - for success, info, warning, danger messages */

.alert {
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  border: 1px solid transparent;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
}

.alert--success {
  background-color: #e5f4eb;
  border-color: #b3dcc2;
  color: var(--color-success);
}

.alert--warning {
  background-color: #fff5e5;
  border-color: #f7d8a4;
  color: var(--color-warning);
}

.alert--danger {
  background-color: #fdecea;
  border-color: #f5b5ae;
  color: var(--color-danger);
}

/* Badges for numeric counts (e.g., trees planted) */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5rem;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: var(--font-size-xs);
  font-weight: 600;
}

/* ========================================================================== 
   Thematic Helpers for Nature / Impact Context
   ========================================================================== */

.bg-forest {
  background: radial-gradient(circle at top left, #e0f1e6 0, transparent 50%),
    linear-gradient(135deg, #f5f7f4 0%, #e7efe9 100%);
}

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

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

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

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

.border-radius-md {
  border-radius: var(--radius-md);
}

.shadow-md {
  box-shadow: var(--shadow-md);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}