/* ============================================================
   Swastya SADAN — Main Foundation CSS
   Design System: Medical Clinic (Production-Ready)
   ============================================================ */

/* ---------------------------------------------------------
   1. CSS RESET (Modern)
   --------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

ul,
ol {
  list-style: none;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  text-decoration: none;
  color: inherit;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

fieldset {
  border: none;
}

/* ---------------------------------------------------------
   2. CSS CUSTOM PROPERTIES
   --------------------------------------------------------- */
:root {
  /* ── Colors ── */
  --color-primary:       #1A6B4A;
  --color-primary-dark:  #145639;
  --color-primary-light: #228B5B;
  --color-accent:        #E8913A;
  --color-accent-dark:   #CF7D2E;
  --color-accent-light:  #F0A85E;
  --color-bg:            #F5F9F7;
  --color-white:         #FFFFFF;
  --color-dark:          #1C2B2B;
  --color-muted:         #6B7E7A;
  --color-alert:         #C0392B;
  --color-success:       #27AE60;
  --color-border:        #D5E0DB;
  --color-card-bg:       #FFFFFF;

  /* ── Typography — Font Families ── */
  --font-display:  "Playfair Display", serif;
  --font-body:     "Noto Sans", sans-serif;
  --font-mono:     "DM Mono", monospace;

  /* ── Typography — Scale (mobile-first, rem) ── */
  --text-xs:   0.8125rem;   /* 13px */
  --text-sm:   0.875rem;    /* 14px */
  --text-base: 1.0625rem;   /* 17px — minimum body */
  --text-md:   1.125rem;    /* 18px */
  --text-lg:   1.25rem;     /* 20px */
  --text-xl:   1.5rem;      /* 24px */
  --text-2xl:  1.875rem;    /* 30px */
  --text-3xl:  2.25rem;     /* 36px */
  --text-4xl:  3rem;        /* 48px */
  --text-5xl:  3.6rem;      /* ~57.6px */

  /* ── Typography — Weights ── */
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semi:     600;
  --fw-bold:     700;

  /* ── Typography — Line Heights ── */
  --lh-body:     1.80;
  --lh-heading:  1.25;
  --lh-tight:    1.15;

  /* ── Spacing ── */
  --space-1:  0.5rem;    /* 8px */
  --space-2:  1rem;      /* 16px */
  --space-3:  1.5rem;    /* 24px */
  --space-4:  2rem;      /* 32px */
  --space-5:  3rem;      /* 48px */
  --space-6:  4rem;      /* 64px */
  --space-7:  5.5rem;    /* 88px */

  /* ── Section Padding ── */
  --section-pad-mobile:  2.5rem;   /* 40px */
  --section-pad-tablet:  3.5rem;   /* 56px */
  --section-pad-desktop: 5.5rem;   /* 88px */

  /* ── Layout ── */
  --max-width:   1200px;
  --grid-cols:   12;
  --grid-gap:    1.5rem;
  --card-radius: 14px;
  --radius-sm:   8px;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow:       0 4px 24px rgba(26, 107, 74, 0.10);
  --shadow-sm:    0 2px 12px rgba(26, 107, 74, 0.08);
  --shadow-lg:    0 8px 40px rgba(26, 107, 74, 0.14);
  --shadow-hover: 0 8px 32px rgba(26, 107, 74, 0.16);
  --shadow-md:    0 4px 20px rgba(26, 107, 74, 0.12);
  --color-light:  #F5F9F7;

  /* ── Transitions ── */
  --transition:      0.3s ease;
  --transition-fast: 0.2s ease;
  --transition-slow: 0.5s ease;

  /* ── Z-indices ── */
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-navbar:    500;
  --z-overlay:   900;
  --z-modal:     1000;
  --z-whatsapp:  9999;
}

/* ---------------------------------------------------------
   3. BASE STYLES
   --------------------------------------------------------- */
html {
  font-size: 100%;
  scroll-padding-top: 7rem;
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  color: var(--color-dark);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background-color: var(--color-primary);
  color: var(--color-white);
}

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

/* ---------------------------------------------------------
   4. TYPOGRAPHY
   --------------------------------------------------------- */
h1, h2 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-heading);
  color: var(--color-dark);
  letter-spacing: -0.01em;
}

h3, h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: var(--fw-semi);
  line-height: var(--lh-heading);
  color: var(--color-dark);
}

h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
}

h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

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

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

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

h6 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p {
  font-size: var(--text-base);
  line-height: var(--lh-body);
  margin-bottom: var(--space-2);
  color: var(--color-dark);
}

a {
  color: var(--color-primary);
  transition: color var(--transition);
}

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

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

strong, b {
  font-weight: var(--fw-semi);
}

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

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

/* ---------------------------------------------------------
   5. LAYOUT UTILITIES
   --------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-2);
  padding-right: var(--space-2);
}

.section {
  padding-top: var(--section-pad-mobile);
  padding-bottom: var(--section-pad-mobile);
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols), 1fr);
  gap: var(--grid-gap);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
}

/* ---------------------------------------------------------
   6. FLEXBOX UTILITIES
   --------------------------------------------------------- */
.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

.flex-gap-1 {
  gap: var(--space-1);
}

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

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

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

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

/* ---------------------------------------------------------
   7. BUTTON STYLES
   --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--fw-semi);
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition),
              color var(--transition),
              border-color var(--transition),
              box-shadow var(--transition),
              transform var(--transition);
  min-height: 48px;
  min-width: 44px;
  text-align: center;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* Primary — Deep Teal-Green */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  box-shadow: var(--shadow);
}

.btn-primary:active {
  background-color: var(--color-primary-dark);
}

/* Accent — Warm Amber */
.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-accent:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  box-shadow: 0 4px 24px rgba(232, 145, 58, 0.25);
}

.btn-accent:active {
  background-color: var(--color-accent-dark);
}

/* Outline */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

/* White Outline (for dark backgrounds) */
.btn-outline-white {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

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

/* Sizes */
.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-sm);
  min-height: 40px;
}

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: var(--text-lg);
  min-height: 56px;
}

/* Disabled state */
.btn:disabled,
.btn.disabled {
  opacity: 0.5;
  pointer-events: none;
  cursor: not-allowed;
}

/* ---------------------------------------------------------
   8. FORM STYLES
   --------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-3);
  position: relative;
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-dark);
  margin-bottom: 0.375rem;
  letter-spacing: 0.01em;
}

.form-label .required {
  color: var(--color-alert);
  margin-left: 0.125rem;
}

.form-input {
  display: block;
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-dark);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition),
              box-shadow var(--transition);
  min-height: 48px;
}

.form-input::placeholder {
  color: var(--color-muted);
  opacity: 0.7;
}

.form-input:hover {
  border-color: var(--color-primary-light);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(26, 107, 74, 0.12);
}

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

.form-input.error:focus {
  box-shadow: 0 0 0 4px rgba(192, 57, 43, 0.12);
}

.form-select {
  display: block;
  width: 100%;
  padding: 0.875rem 2.5rem 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-dark);
  background-color: var(--color-white);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236B7E7A' d='M1.41 0L6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 12px 8px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  appearance: none;
  cursor: pointer;
  transition: border-color var(--transition),
              box-shadow var(--transition);
  min-height: 48px;
}

.form-select:hover {
  border-color: var(--color-primary-light);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(26, 107, 74, 0.12);
}

.form-textarea {
  display: block;
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--lh-body);
  color: var(--color-dark);
  background-color: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  resize: vertical;
  min-height: 120px;
  transition: border-color var(--transition),
              box-shadow var(--transition);
}

.form-textarea:hover {
  border-color: var(--color-primary-light);
}

.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(26, 107, 74, 0.12);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  min-width: 20px;
  margin-top: 0.15rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-checkbox label {
  font-size: var(--text-sm);
  color: var(--color-dark);
  line-height: 1.5;
  cursor: pointer;
}

.form-error,
.field-error {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-alert);
  margin-top: 0.375rem;
}

.form-group.is-invalid .form-error,
.form-group.is-invalid .field-error {
  display: block;
}

.form-hint {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: 0.375rem;
}

/* ---------------------------------------------------------
   9. TEXT UTILITIES
   --------------------------------------------------------- */
.text-center {
  text-align: center;
}

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

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

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

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

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

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

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

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

.text-mono {
  font-family: var(--font-mono);
}

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

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

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

/* ---------------------------------------------------------
   10. SPACING UTILITIES
   --------------------------------------------------------- */
/* Margin Top */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }

/* Margin Bottom */
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }

/* Padding Top + Bottom */
.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-5 { padding-top: var(--space-5); padding-bottom: var(--space-5); }

/* Padding Left + Right */
.px-1 { padding-left: var(--space-1); padding-right: var(--space-1); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }

/* Margin Auto */
.mx-auto { margin-left: auto; margin-right: auto; }

/* ---------------------------------------------------------
   11. VISIBILITY UTILITIES
   --------------------------------------------------------- */
.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;
}

.hidden {
  display: none !important;
}

.visible {
  visibility: visible;
}

.invisible {
  visibility: hidden;
}

/* ---------------------------------------------------------
   12. SCROLL REVEAL ANIMATION
   --------------------------------------------------------- */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out,
              transform 0.6s ease-out;
}

.scroll-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delay helpers */
.scroll-reveal.delay-1 { transition-delay: 0.1s; }
.scroll-reveal.delay-2 { transition-delay: 0.2s; }
.scroll-reveal.delay-3 { transition-delay: 0.3s; }
.scroll-reveal.delay-4 { transition-delay: 0.4s; }

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}