* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

#page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
  background: #f0f4f8;
}

#content {
  flex: 1;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #faf7f2;
  color: #3a3a3a;
  line-height: 1.6;
  padding: 1rem;
}

/* Header */

header {
  background: linear-gradient(135deg, #7da350, #E0F2F1);
  background-color: #EAF4E1;
  padding: 1rem 2rem;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgb(100 100 100 / 10%);
  margin-bottom: 2rem;
  color: #2E473B;
  border-bottom: 2px solid #A5C882;
}

header h1 {
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* Navigation */

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
}

nav a {
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: #3E5C45;
  font-weight: 600;
  transition: all 0.3s ease;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
}

nav a::after{
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: #254603;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s ease;
}

nav a:hover {
  background-color: rgb(165 200 130 / 20%);
  color: #2E473B;
}

nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

nav a.active-link {
  background-color: #CDE9C5;
  color: #2E473B;
  font-weight: 700;
  box-shadow: 0 2px 4px rgb(100 100 100 / 10%);
}

/* Section */

section {
  background: linear-gradient(135deg, #7da350, #e0f2e8);
  background-color: #EAF4E1;;
  padding: 1.5rem 2rem;
  border-radius: 10px;
  box-shadow: 0 3px 6px rgb(0 0 0 / 10%);
  margin-bottom: 2rem;
}

h2, h3 {
  margin-bottom: 1rem;
  color: #2E473B;
}

.hidden {
  display: none;
}

/* Book Entries */

.book-entry {
  background-color: #f9fbf8;
  border-radius: 8px;
  padding: 1rem 1.3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.1rem;
}

.book-entry:nth-child(even) {
  background-color: #cde9c5;
}

.book-entry:hover {
  box-shadow: 0 3px 6px rgb(0 0 0 / 10%);
  transform: translateY(-2px);
  transition: all 0.3s ease;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 999px;
  padding: 0.55rem 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: #2E473B;
  color: #fff;
  box-shadow: 0 6px 12px rgb(121 163 77 / 25%);
}

.btn-primary:hover {
  background: #4c7e2f;
  box-shadow: 0 8px 16px rgb(121 163 77 / 32%);
}

.btn-danger {
  background: #f0aa4e;
  color: #070707;
  box-shadow: 0 6px 12px rgb(212 106 106 / 25%);
}

.btn-danger:hover {
  background: #b63711;
  box-shadow: 0 8px 16px rgb(212 106 106 / 32%);
}

/* Contact Form and section */

.contact-content {
  display: flex;
  align-items: flex-start;
  gap: 3rem;
  margin-top: 2rem;
}

.contact-info {
  flex: 1;
  max-width: 400px;
}

.form {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  margin-top: 1.5rem;
}

.form-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input,
.textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 1.5px solid #a5c882;
  border-radius: 8px;
  background-color: #f9fbf8;
  outline: none;
  transition: all 0.3s ease;
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

.input:focus,
.textarea:focus {
  border-color: #79a34d;
  box-shadow: 0 0 8px rgb(121 163 77 / 20%);
  background-color: #fff;
}

.form button {
  align-self: center;
  margin-top: 0.5rem;
}

.success-message {
  color: #2e473b;
  background: #cde9c5;
  border: 1px solid #a5c882;
  border-radius: 8px;
  padding: 0.8rem 1rem;
  margin-top: 1rem;
  font-weight: 600;
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.warning-message {
  color: #d46a6a;
  background: #fdecec;
  border: 1px solid #d46a6a;
  border-radius: 8px;
  padding: 0.8rem 1rem;
  margin-top: 1rem;
  font-weight: 600;
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.success-message, .warning-message {
  max-width: 100%;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#contact-section {
    background: linear-gradient(135deg, #f6fbf3, #e9f7ef);
  border-radius: 16px;
  box-shadow: 0 6px 20px rgb(0 0 0 / 8%);
  opacity: 0;
  transition: opacity 0.8s ease;
  overflow: visible; /* ✅ da animacija ne bude "isečena" */
  max-width: 700px;
  margin: 3rem auto;
  padding: 2.5rem 2rem;
}

#contact-section.visible {
  opacity: 1;
  animation: fadeInSection 0.8s ease forwards;
}

/* Shake animation for invalid form submission */
#contact-form {
  flex: 1;
  position: relative;
  will-change: transform, box-shadow;
  max-width: 500px; /* ✅ da forma ne zauzme ceo ekran */
  margin: 0 auto;   /* centrirana i lakše vidljivo podrhtavanje */
}

#contact-form.shake {
  background-color: #fdecec;
  transition: background-color 0.3s ease;
  animation: form-shake 600ms cubic-bezier(.36,.07,.19,.97),
             form-pulse 600ms ease;
  transform-origin: center;
  border: 2px solid #d46a6a !important;
  box-shadow: 0 0 12px rgb(212 106 106 / 40%) !important;
}

/* ✨ Jače podrhtavanje i mekši prelaz */
@keyframes form-shake {
  0%, 100% { transform: translateX(0); }
  15%, 45%, 75% { transform: translateX(-20px); }
  30%, 60%, 90% { transform: translateX(20px); }
}

@keyframes form-pulse {
  0%, 100% { background-color: transparent; }
  50% { background-color: #fdecec; }
}

.form.highlight {
  animation: form-highlight 1.5s ease;
}

@keyframes form-highlight {
  0% {
    box-shadow: 0 0 12px #79a34d80;
  }

  50%{
    box-shadow: 0 0 20px #69a728b3;
  }

  100% {
    box-shadow: 0 0 12px #89d13c80;
  }
}

.contact-info,
#contact-form {
  background: #f9fbf8;
  padding: 1.5rem;
  border-radius: 12px;
}

.footer {
  margin-top: 4rem;
  padding: 1.5rem 1rem;
  background: linear-gradient(135deg, #e9f7ef, #f6fbf3);
  border-top: 1px solid #a5c882;
  border-radius: 12px 12px 0 0;
  box-shadow: 0 -4px 10px rgb(0 0 0 / 6%);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
  text-align: center;
}

.footer-copy {
  font-size: 0.9rem;
  color: #2e473b;
  margin: 0;
}

.footer-date {
  font-size: 0.8rem;
  color: #5f7d6b;
  margin: 0;
}

/* Mobile Responsiveness */

@media (width <= 600px) {
  nav ul {
    flex-direction: column;
    gap: 1rem;
  }

  header h1 {
    font-size: 1.8rem;
  }
}