/* ============================================
   Japan Karate Institute - Modern CSS
   2026 Responsive Design System
   ============================================ */

/* ============================================
   CSS Variables - Design System
   ============================================ */
:root {
  /* Colors - Professional teal accent palette */
  --color-primary-900: #004d4d;
  --color-primary-700: #006666;
  --color-primary-500: #008080;  /* Original teal */
  --color-primary-300: #4db8b8;
  --color-primary-100: #e6f5f5;

  --color-gray-900: #1a1a1a;
  --color-gray-800: #2d2d2d;
  --color-gray-600: #666666;
  --color-gray-400: #999999;
  --color-gray-200: #e5e5e5;
  --color-gray-100: #f5f5f5;
  --color-white: #ffffff;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-heading: 'Montserrat', var(--font-primary);

  /* Fluid typography - scales with viewport */
  --text-sm: clamp(0.875rem, 0.85rem + 0.125vw, 0.9375rem);  /* 14-15px */
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);  /* 16-18px */
  --text-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);  /* 18-20px */
  --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);  /* 20-24px */
  --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);  /* 24-32px */
  --text-3xl: clamp(2rem, 1.75rem + 1.25vw, 3rem);  /* 32-48px */

  /* Spacing (8px base) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.5rem;    /* 24px */
  --space-6: 2rem;      /* 32px */
  --space-8: 3rem;      /* 48px */
  --space-10: 4rem;     /* 64px */
  --space-12: 6rem;     /* 96px */

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;

  /* Border radius */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 1rem;     /* 16px */
  --radius-xl: 1.5rem;   /* 24px */

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ============================================
   Modern CSS Reset
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  min-height: 100vh;
}

/* Replace 18-year-old JavaScript with simple CSS */
body {
  background: url('images/Background2.jpg') center/cover fixed no-repeat;
}

/* Responsive images */
img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Modern link styling */
a {
  color: var(--color-primary-700);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary-900);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary-700);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
}

ul, ol {
  margin-left: var(--space-5);
  margin-bottom: var(--space-4);
}

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

/* Container - replaces table centering */
.container {
  width: 100%;
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* Card component - for content sections */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

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

@media (min-width: 768px) {
  .card {
    padding: var(--space-8);
  }
}

/* Grid layouts */
.content-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

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

@media (min-width: 1024px) {
  .content-grid {
    gap: var(--space-8);
  }
}

/* ============================================
   Header Styles
   ============================================ */
.site-header {
  background: var(--color-white);
  border-bottom: 3px solid var(--color-primary-700);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.header-top {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .header-top {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.site-branding {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .site-branding {
    text-align: left;
    flex-direction: row;
    align-items: center;
  }
}

.site-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-primary-300);
  overflow: hidden;
}

.site-logo img {
  width: 84px;
  height: 84px;
  object-fit: contain;
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

@media (min-width: 768px) {
  .site-title {
    font-size: var(--text-2xl);
  }
}

.site-title a {
  color: var(--color-primary-900);
  text-decoration: none;
}

.site-title a:hover {
  color: var(--color-primary-700);
}

.site-contact {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  margin-bottom: 0;
}

.site-tagline {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-700);
  margin-bottom: 0;
  font-weight: 600;
}

.site-contact a {
  color: var(--color-primary-700);
  font-weight: 500;
}

/* Navigation */
.main-nav {
  position: relative;
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-primary-700);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-base);
  margin: 0 auto;
}

.nav-toggle:hover {
  background: var(--color-primary-900);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary-700);
  outline-offset: 2px;
}

/* Hamburger icon */
.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

/* Animated hamburger when open */
.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* Navigation menu */
.nav-menu {
  display: none;
  list-style: none;
  margin: var(--space-4) 0 0 0;
  padding: 0;
}

.nav-menu.is-open {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary-100);
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 500;
  color: var(--color-primary-900);
  transition: all var(--transition-base);
}

.nav-menu a:hover {
  background: var(--color-primary-700);
  color: var(--color-white);
  text-decoration: none;
  transform: translateX(4px);
}

/* Desktop navigation */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin: 0;
    justify-content: center;
  }

  .nav-menu a:hover {
    transform: translateY(-2px);
  }
}

/* ============================================
   Footer Styles
   ============================================ */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--space-8) 0 var(--space-6);
  margin-top: var(--space-12);
  border-top: 3px solid var(--color-primary-700);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-6);
  list-style: none;
  margin-left: 0;
}

.footer-nav a {
  color: var(--color-white);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: background var(--transition-base);
  font-size: var(--text-sm);
}

.footer-nav a:hover {
  background: var(--color-primary-700);
  text-decoration: none;
}

.footer-copyright {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-gray-800);
}

.footer-copyright p {
  margin-bottom: 0;
}

/* ============================================
   Main Content Area
   ============================================ */
.site-main {
  padding: var(--space-8) 0;
  min-height: 60vh;
}

/* Page hero */
.page-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  margin-bottom: var(--space-8);
  background: linear-gradient(135deg, rgba(0, 102, 102, 0.12), rgba(0, 77, 77, 0.2));
  border: 1px solid rgba(0, 102, 102, 0.2);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(0, 102, 102, 0.2), transparent 55%);
  pointer-events: none;
}

.page-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.page-hero-title {
  font-size: var(--text-3xl);
  color: var(--color-primary-900);
  margin-bottom: var(--space-3);
}

.page-hero-lede {
  font-size: var(--text-lg);
  color: var(--color-gray-700);
  margin-bottom: 0;
}

/* Page title */
.page-title {
  font-size: var(--text-3xl);
  color: var(--color-primary-900);
  text-align: center;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 3px solid var(--color-primary-300);
}

/* Content sections */
.content-section {
  margin-bottom: var(--space-10);
}

.content-section:last-child {
  margin-bottom: 0;
}

/* Hero section */
.hero {
  text-align: center;
  padding: var(--space-10) 0 var(--space-8);
  margin-bottom: var(--space-10);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(0, 77, 77, 0.92), rgba(0, 102, 102, 0.8)),
              radial-gradient(circle at top left, rgba(77, 184, 184, 0.4), transparent 55%);
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(0, 0, 0, 0.2), transparent 55%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.hero-eyebrow {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  opacity: 0.85;
  margin-bottom: var(--space-3);
}

.hero-title {
  font-size: clamp(2.5rem, 2rem + 2vw, 3.5rem);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.hero-lede {
  font-size: var(--text-lg);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: var(--space-6);
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.hero-highlights span {
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}

.signal-bar {
  margin-top: calc(-1 * var(--space-6));
  margin-bottom: var(--space-8);
  display: flex;
  justify-content: center;
}

.signal-bar p {
  background: var(--color-white);
  color: var(--color-primary-900);
  padding: var(--space-3) var(--space-6);
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: var(--text-sm);
  margin: 0;
}

.section-intro {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-6);
}

.section-kicker {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  color: var(--color-primary-700);
  font-size: var(--text-sm);
  margin-bottom: var(--space-3);
}

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

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

.program-card {
  position: relative;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  border-top: 4px solid var(--color-primary-700);
}

.program-card h3 {
  margin-bottom: var(--space-3);
}

.program-card p {
  margin-bottom: var(--space-4);
}

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

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

.impact-card {
  background: rgba(0, 102, 102, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid rgba(0, 102, 102, 0.2);
}

.impact-card h3 {
  margin-bottom: var(--space-3);
  color: var(--color-primary-900);
}

/* ============================================
   Instructor Cards
   ============================================ */
.instructors-grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

.card-instructor {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 768px) {
  .card-instructor {
    grid-template-columns: 150px 1fr;
  }
}

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

@media (min-width: 768px) {
  .instructor-image {
    text-align: left;
  }
}

.instructor-image img {
  border-radius: var(--radius-md);
  border: 3px solid var(--color-primary-300);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .instructor-image img {
    margin: 0;
  }
}

.instructor-name {
  font-size: var(--text-2xl);
  color: var(--color-primary-900);
  margin-bottom: var(--space-2);
}

.instructor-title {
  font-weight: 600;
  color: var(--color-primary-700);
  margin-bottom: var(--space-4);
  font-size: var(--text-lg);
}

.instructor-bio p {
  margin-bottom: var(--space-4);
}

.instructor-bio p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Schedule / Calendar Styles
   ============================================ */
.calendar-wrapper {
  position: relative;
  padding-bottom: 75%; /* 4:3 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: var(--space-6) 0;
}

.calendar-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (min-width: 768px) {
  .calendar-wrapper {
    padding-bottom: 60%; /* Wider on desktop */
  }
}

/* ============================================
   Notification Banner
   ============================================ */
.notification-banner {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-bottom: 3px solid #f59e0b;
  padding: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
}

.notification-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.notification-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: #d97706;
}

.notification-content p {
  margin: 0;
  color: var(--color-gray-900);
  font-weight: 500;
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* Accessibility - screen reader only */
.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;
}

/* Focus styles for better keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--color-primary-700);
  outline-offset: 2px;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    border: 1px solid #000;
    box-shadow: none;
  }
}