/* =============================================================================
   Long Tom — main.css
   Language tutor site for Tom Greschler
   Brandbook: docs/brandbook.md
   Mobile-first. No framework. CSS custom properties throughout.
   ============================================================================= */

/* =============================================================================
   GOOGLE FONTS
   Fraunces (serif headings) + Inter (humanist sans body)
   font-display: swap for performance
   ============================================================================= */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,700&family=Inter:wght@400;500;600&display=swap');


/* =============================================================================
   DESIGN TOKENS — CSS custom properties
   All colours, spacing, type scales defined here.
   To retheme: edit only this block.
   ============================================================================= */
:root {
  /* Colour palette */
  --color-bg:            #F7F4EF;   /* warm off-white page background */
  --color-surface:       #EDEAE3;   /* card/alternate section backgrounds */
  --color-surface-dark:  #E3DFD6;   /* deeper surface for contrast bands */
  --color-text:          #2C2520;   /* primary text — warm dark brown, not pure black */
  --color-text-muted:    #6B6259;   /* secondary text, captions */
  --color-accent:        #C05E3C;   /* terracotta — CTAs, highlights */
  --color-accent-hover:  #A84D2E;   /* accent hover */
  --color-accent-light:  #F0DDD6;   /* tinted accent surface (Swedish card) */
  --color-border:        #D8D3CA;   /* borders, dividers */
  --color-border-focus:  #C05E3C;   /* focus ring — matches accent */
  --color-white:         #FFFFFF;
  --color-error:         #C0392B;
  --color-error-bg:      #FEF8F7;
  --color-success-bg:    #F0F7F4;
  --color-success-text:  #2D6A4F;

  /* Typography */
  --font-heading:  'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body:     'Inter', system-ui, -apple-system, sans-serif;

  --text-xs:    0.75rem;     /* 12px */
  --text-sm:    0.875rem;    /* 14px */
  --text-base:  1rem;        /* 16px */
  --text-lg:    1.125rem;    /* 18px */
  --text-xl:    1.25rem;     /* 20px */
  --text-2xl:   1.5rem;      /* 24px */
  --text-3xl:   clamp(1.75rem, 4.5vw, 2.75rem);  /* fluid hero headline */

  /* Spacing (8px base unit) */
  --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;

  /* Layout */
  --max-reading: 780px;
  --max-content: 1040px;

  /* Borders */
  --radius-sm:  3px;
  --radius-md:  4px;

  /* Transitions */
  --transition: 0.22s ease;
}


/* =============================================================================
   RESET & BASE
   ============================================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

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

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  color: var(--color-text);
  font-weight: 700;
}

/* Reduced motion — disable all transitions and animations */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* =============================================================================
   SKIP LINK
   ============================================================================= */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--text-sm);
  z-index: 1000;
  text-decoration: none;
  transition: top 0.1s;
}

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


/* =============================================================================
   LAYOUT UTILITY — CONTAINER
   ============================================================================= */
.container {
  width: 100%;
  max-width: var(--max-reading);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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


/* =============================================================================
   SITE HEADER & NAV
   ============================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  /* Subtle backdrop blur for browsers that support it */
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  background-color: rgba(247, 244, 239, 0.94);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--max-content);
  margin-inline: auto;
  padding: var(--space-4) var(--space-6);
}

/* Logo / brand wordmark */
.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo:hover {
  color: var(--color-accent);
}

/* Nav links — hidden on mobile, shown on larger screens */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

/* CTA link in nav */
.nav-links .nav-cta {
  font-weight: 600;
  color: var(--color-accent);
}

.nav-links .nav-cta:hover {
  color: var(--color-accent-hover);
}

/* Active nav link (JS-powered, highlights current section) */
.nav-links a.nav-active {
  color: var(--color-text);
  font-weight: 600;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.lang-switcher a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
}

.lang-switcher a:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
}

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
}


/* =============================================================================
   BUTTONS
   All variants share base styles; specifics follow.
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition),
              box-shadow var(--transition);
  white-space: nowrap;
}

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

/* Primary — solid terracotta */
.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(192, 94, 60, 0.25);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Secondary — outline terracotta */
.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* Outline — ghost with neutral border */
.btn-outline {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}


/* =============================================================================
   SECTION SHARED STYLES
   ============================================================================= */
.section-hero,
.section-languages,
.section-method,
.section-about,
.section-testimonials,
.section-contact {
  padding-block: var(--space-16);
}

/* Section heading — h2 with decorative rule */
.section-heading {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.section-heading::after {
  content: '';
  display: block;
  width: 2.5rem;
  height: 2px;
  background-color: var(--color-accent);
  margin-top: var(--space-3);
  border-radius: 1px;
}

/* Section intro paragraph */
.section-intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 58ch;
  margin-bottom: var(--space-10);
}

/* Scroll-reveal: sections start hidden, JS adds .is-visible */
.section-hero,
.section-languages,
.section-method,
.section-about,
.section-testimonials,
.section-contact {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.section-hero.is-visible,
.section-languages.is-visible,
.section-method.is-visible,
.section-about.is-visible,
.section-testimonials.is-visible,
.section-contact.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* =============================================================================
   HERO SECTION
   ============================================================================= */
.section-hero {
  position: relative;
  padding-block: var(--space-20) var(--space-16);
  border-bottom: 1px solid var(--color-border);
  background-image:
    linear-gradient(
      to right,
      rgba(247, 244, 239, 0.97) 0%,
      rgba(247, 244, 239, 0.88) 45%,
      rgba(247, 244, 239, 0.55) 100%
    ),
    url('/static/img/hero-bg.jpg');
  background-size: cover;
  background-position: center right;
  background-repeat: no-repeat;
  overflow: hidden;
}

.section-hero .container {
  position: relative;
  max-width: var(--max-reading);
}

.hero-headline {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  max-width: 20ch;
  line-height: 1.1;
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 48ch;
  margin-bottom: var(--space-10);
}

@media (max-width: 639px) {
  .section-hero {
    background-image:
      linear-gradient(
        to bottom,
        rgba(247, 244, 239, 0.94) 0%,
        rgba(247, 244, 239, 0.82) 60%,
        rgba(247, 244, 239, 0.55) 100%
      ),
      url('/static/img/hero-bg.jpg');
    background-position: center bottom;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .section-hero {
    padding-block: var(--space-24) var(--space-20);
  }
}


/* =============================================================================
   LANGUAGES SECTION
   ============================================================================= */
.section-languages {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.languages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

/* Language card base */
.language-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.language-name {
  font-size: var(--text-2xl);
  font-weight: 700;
}

.language-tagline {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.language-blurb {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: var(--space-4);
}

.language-card .btn-outline {
  align-self: flex-start;
  margin-top: auto;
}

/* Swedish card — visual priority */
#lang-swedish {
  background-color: var(--color-accent-light);
  border-color: transparent;
  border-left: 3px solid var(--color-accent);
}

#lang-swedish .language-name {
  font-size: calc(var(--text-2xl) * 1.1);
}

#lang-swedish .language-blurb {
  color: var(--color-text);
}

@media (min-width: 640px) {
  .languages-grid {
    grid-template-columns: 1fr 1fr;
  }

  /* Swedish spans full width on tablet to signal dominance */
  #lang-swedish {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .languages-grid {
    /* 3-col: Swedish large left, other three right column */
    grid-template-columns: 1.4fr 1fr 1fr;
    grid-template-rows: auto auto;
  }

  #lang-swedish {
    grid-column: 1;
    grid-row: 1 / 3;
  }

  #lang-hebrew  { grid-column: 2; grid-row: 1; }
  #lang-english { grid-column: 3; grid-row: 1; }
  #lang-spanish { grid-column: 2 / 4; grid-row: 2; }
}


/* =============================================================================
   METHOD SECTION
   ============================================================================= */
.section-method {
  border-bottom: 1px solid var(--color-border);
}

.method-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.method-point {
  padding-left: var(--space-6);
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition);
}

.method-point:hover {
  border-left-color: var(--color-accent);
}

.method-point-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.method-point-body {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 55ch;
}

.method-image {
  margin-top: var(--space-8);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.method-image img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  filter: sepia(35%) saturate(0.75) brightness(0.95);
  border-radius: var(--radius-md);
  transition: filter var(--transition);
}

.method-image img:hover {
  filter: sepia(20%) saturate(0.9) brightness(1);
}

@media (min-width: 900px) {
  .method-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8) var(--space-12);
    margin-bottom: var(--space-16);
  }
}


/* =============================================================================
   ABOUT SECTION
   ============================================================================= */
.section-about {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.about-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.about-text p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: 1.75;
}

.about-text p:last-of-type {
  margin-bottom: 0;
}

/* Social links inside about */
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: color var(--transition), border-color var(--transition),
              background-color var(--transition);
}

.about-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-accent-light);
}

.about-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  fill: currentColor;
}

/* About image column */
.about-images {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.about-images figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
}

.about-images img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  filter: sepia(35%) saturate(0.75) brightness(0.95);
  border-radius: var(--radius-md);
  transition: filter var(--transition);
}

.about-images img:hover {
  filter: sepia(20%) saturate(0.9) brightness(1);
}

@media (min-width: 640px) {
  .about-images {
    flex-direction: row;
  }

  .about-images figure {
    flex: 1;
  }

  .about-images img {
    height: 320px;
  }
}

@media (min-width: 900px) {
  .about-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
  }

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

  .about-images img {
    height: 260px;
  }
}


/* =============================================================================
   TESTIMONIALS SECTION
   ============================================================================= */
.section-testimonials {
  border-bottom: 1px solid var(--color-border);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.testimonial {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
}

.testimonial-quote {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 400;
  font-style: italic;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.testimonial-attribution {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.testimonial-attribution cite {
  font-style: normal;
  font-weight: 600;
  color: var(--color-text);
}

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

.testimonial-context::before {
  content: '·';
  margin-right: var(--space-3);
}

@media (min-width: 640px) {
  .testimonials-grid {
    grid-template-columns: 1fr 1fr;
  }

  .testimonials-grid .testimonial:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: 560px;
  }
}

@media (min-width: 900px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .testimonials-grid .testimonial:last-child:nth-child(odd) {
    grid-column: auto;
    max-width: none;
  }
}


/* =============================================================================
   CONTACT SECTION
   ============================================================================= */
.section-contact {
  background-color: var(--color-surface);
}

/* Honeypot — visually hidden from humans, accessible to bots */
.hp-field {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact-form {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.form-group label span[aria-hidden] {
  color: var(--color-accent);
  margin-left: 1px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(192, 94, 60, 0.15);
}

/* Select arrow */
.form-group select {
  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 d='M1 1l5 5 5-5' stroke='%236B6259' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
  cursor: pointer;
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

/* Error state on inputs */
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--color-error);
  background-color: var(--color-error-bg);
}

.form-actions {
  padding-top: var(--space-2);
}

.form-actions .btn-primary {
  min-width: 160px;
}

/* Loading state on submit button */
.form-actions .btn-primary.is-loading {
  opacity: 0.7;
  cursor: not-allowed;
  pointer-events: none;
}

/* Form status messages */
.form-status {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
}

.form-success {
  background-color: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid rgba(45, 106, 79, 0.25);
}

.form-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid rgba(192, 57, 43, 0.25);
}

/* [hidden] attribute respected */
[hidden] {
  display: none !important;
}


/* =============================================================================
   FOOTER
   ============================================================================= */
.site-footer {
  background-color: var(--color-text);
  color: var(--color-surface);
  padding-block: var(--space-12);
  text-align: center;
}

.footer-tagline {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 400;
  font-style: italic;
  color: var(--color-bg);
  margin-bottom: var(--space-3);
  opacity: 0.85;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-meta a {
  color: var(--color-surface-dark);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-meta a:hover {
  color: var(--color-bg);
}

.footer-divider {
  color: var(--color-text-muted);
  opacity: 0.4;
}

.footer-copyright {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  opacity: 0.6;
}