/* style.css — MealMind Design Tokens & Components */

/* ============================================
   TYPE SCALE (fluid)
   ============================================ */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* SPACING (4px grid) */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* FONTS */
  --font-display: 'Instrument Serif', 'Georgia', serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  /* RADIUS */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* TRANSITIONS */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* CONTENT WIDTHS */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ============================================
   LIGHT MODE (default)
   ============================================ */
:root, [data-theme="light"] {
  --color-bg:             #f7f6f2;
  --color-surface:        #f9f8f5;
  --color-surface-2:      #fbfbf9;
  --color-surface-offset: #f3f0ec;
  --color-surface-offset-2: #edeae5;
  --color-surface-dynamic: #e6e4df;
  --color-divider:        #dcd9d5;
  --color-border:         #d4d1ca;

  --color-text:           #28251d;
  --color-text-muted:     #7a7974;
  --color-text-faint:     #bab9b4;
  --color-text-inverse:   #f9f8f4;

  --color-primary:        #01696f;
  --color-primary-hover:  #0c4e54;
  --color-primary-active: #0f3638;
  --color-primary-highlight: #cedcd8;

  --color-success:        #437a22;
  --color-success-highlight: #d4dfcc;
  --color-error:          #a12c7b;
  --color-warning:        #964219;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
  --color-bg:             #171614;
  --color-surface:        #1c1b19;
  --color-surface-2:      #201f1d;
  --color-surface-offset: #1d1c1a;
  --color-surface-offset-2: #22211f;
  --color-surface-dynamic: #2d2c2a;
  --color-divider:        #262523;
  --color-border:         #393836;

  --color-text:           #cdccca;
  --color-text-muted:     #797876;
  --color-text-faint:     #5a5957;
  --color-text-inverse:   #2b2a28;

  --color-primary:        #4f98a3;
  --color-primary-hover:  #227f8b;
  --color-primary-active: #1a626b;
  --color-primary-highlight: #313b3b;

  --color-success:        #6daa45;
  --color-success-highlight: #3a4435;
  --color-error:          #d163a7;
  --color-warning:        #bb653b;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #171614;
    --color-surface:        #1c1b19;
    --color-surface-2:      #201f1d;
    --color-surface-offset: #1d1c1a;
    --color-surface-offset-2: #22211f;
    --color-surface-dynamic: #2d2c2a;
    --color-divider:        #262523;
    --color-border:         #393836;
    --color-text:           #cdccca;
    --color-text-muted:     #797876;
    --color-text-faint:     #5a5957;
    --color-text-inverse:   #2b2a28;
    --color-primary:        #4f98a3;
    --color-primary-hover:  #227f8b;
    --color-primary-active: #1a626b;
    --color-primary-highlight: #313b3b;
    --color-success:        #6daa45;
    --color-success-highlight: #3a4435;
    --color-error:          #d163a7;
    --color-warning:        #bb653b;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-narrow {
  max-width: var(--content-narrow);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-wide {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
  transition: color var(--transition-interactive);
}

.site-logo:hover {
  color: var(--color-primary);
}

.site-logo span {
  color: var(--color-primary);
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-desktop a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
  white-space: nowrap;
}

.nav-desktop a:hover,
.nav-desktop a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

[data-theme-toggle] {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

[data-theme-toggle]:hover {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}

/* Mobile menu toggle */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.mobile-menu-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-nav {
  display: none;
  padding: var(--space-4);
  border-top: 1px solid var(--color-divider);
  background: var(--color-bg);
}

.mobile-nav.open {
  display: block;
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none !important;
  }
}

.mobile-nav a {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.mobile-nav a:hover,
.mobile-nav a:active,
.mobile-nav a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  padding: clamp(var(--space-12), 8vw, var(--space-32)) var(--space-4);
  text-align: center;
}

.hero-inner {
  max-width: var(--content-default);
  margin-inline: auto;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero-subtext {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

/* WhatsApp brand color variant */
.btn-whatsapp {
  background: #25D366;
  color: #fff;
}

.btn-whatsapp:hover {
  background: #1ebe57;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-whatsapp:active {
  background: #17a54a;
  transform: translateY(0);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: clamp(var(--space-10), 6vw, var(--space-20)) var(--space-4);
}

.section-alt {
  background: var(--color-surface-offset);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 55ch;
  margin-inline: auto;
  margin-bottom: var(--space-10);
}

/* ============================================
   HOW IT WORKS (Steps)
   ============================================ */
.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--content-default);
  margin-inline: auto;
}

@media (min-width: 768px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step {
  text-align: center;
  padding: var(--space-6);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.step h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.step p {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 35ch;
  margin-inline: auto;
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--content-default);
  margin-inline: auto;
}

@media (min-width: 600px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.feature-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
  max-width: 60ch;
  margin-inline: auto;
  text-align: center;
}

.about-content p {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-inline: auto;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-12) var(--space-4) var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--content-default);
  margin-inline: auto;
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-brand .site-logo {
  font-size: var(--text-xl);
}

.footer-brand p {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.footer-links h4 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-top: var(--space-8);
  margin-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-bottom p {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ============================================
   LEGAL PAGES
   ============================================ */
.legal-page {
  padding: clamp(var(--space-8), 4vw, var(--space-16)) var(--space-4);
}

.legal-content {
  max-width: var(--content-narrow);
  margin-inline: auto;
}

.legal-content h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.legal-content .effective-date {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-10);
}

.legal-content h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}

.legal-content p {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.legal-content ul {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

.legal-content li {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-2);
}

.legal-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-interactive);
}

.legal-content a:hover {
  color: var(--color-primary-hover);
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--content-narrow);
  margin-inline: auto;
}

.contact-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.06);
  border-radius: var(--radius-lg);
}

.contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.contact-details h3 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.contact-details p,
.contact-details a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.contact-details a {
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.contact-details a:hover {
  color: var(--color-primary);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ============================================
   SKIP LINK
   ============================================ */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 200;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-4);
}