/* ================== ROOT VARIABLES ================== */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --accent: #38bdf8;
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --card-bg: #ffffff;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 10px 30px rgba(0,0,0,0.08);

  --error: #dc2626;
  --success: #16a34a;

  --gradient: linear-gradient(135deg, #2563eb, #1e40af);
  --transition: all 0.3s ease;
}



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

body {
  font-family: 'Roboto', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

.hidden {
  display: none !important;
}

/* ================== MAIN WRAPPER ================== */
.main-wrapper {
  max-width: 1200px;
  margin: auto;
  padding: 20px;
}

/* ================== HEADER ================== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg);
  padding: 16px 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 10px;
  z-index: 50;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header__logo img {
  width: 48px;
  height: 42px;
  border-radius: 50%;
  
}


.header__nav ul {
  display: flex;
  list-style: none;
  gap: 15px;
  padding-left: 20px;
}

.header__nav a {
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 600;
  color: var(--muted);
  transition: var(--transition);
}



.theme-toggle {
  border: none;
  background: var(--bg);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

/* ================== NAV TEXT UNDERLINE ================== */

/* Base style for all links */
.header__nav a {
  position: relative;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 12px;
  font-weight: 600;
  transition: color 0.3s ease;
}

/* Underline */
.header__nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;          
  background-color: #f59e0b; 
  transition: width 0.35s ease;
  border-radius: 2px;
}

/* Light mode hover */
:not([data-theme="dark"]) .header__nav a:hover,
:not([data-theme="dark"]) .header__nav a.active {
  color: #10b981; 
  background: transparent;
}

:not([data-theme="dark"]) .header__nav a:hover::after,
:not([data-theme="dark"]) .header__nav a.active::after {
  width: 100%;
  background-color: #10b981; 
}

/* Dark mode hover */
[data-theme="dark"] .header__nav a:hover,
[data-theme="dark"] .header__nav a.active {
  color: #10b981; /* keep orange */
  background: transparent;
}

[data-theme="dark"] .header__nav a:hover::after,
[data-theme="dark"] .header__nav a.active::after {
  width: 100%;
  background-color: #10b981; /* keep orange underline */
}


/* ================== CONTENT SECTIONS ================== */
.content-section {
  max-width: 900px;
  margin: 50px auto;
  display: none;
  opacity: 0;
  transform: translateX(100%);
  transition: 0.6s ease;
}

.content-section.active-section {
  display: block;
  opacity: 1;
  transform: translateX(0);
}

/* ================== HERO ================== */
.hero-section {
  background: var(--gradient);
  color: #fff;
  padding: 70px 30px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.hero__title {
  font-size: 2.6rem;
  margin-bottom: 15px;
}

.hero__subtitle {
  font-size: 1.15rem;
  margin-bottom: 30px;
}

/* ================== BUTTON ================== */
.btn {
  border: none;
  cursor: pointer;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 600;
  transition: var(--transition);
}

.btn--primary {
  background: var(--gradient);
  color: #fff;
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 25px rgba(37,99,235,0.4);
}


/* ================== CALCULATOR CARD ================== */
.calculator-card {
  background: var(--card-bg);
  padding: 50px 35px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  max-width: 720px;
  margin: 60px auto;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}

.calculator-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(37,99,235,0.08), transparent 70%);
  transform: rotate(45deg);
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.calculator-card:hover::before {
  opacity: 0.6;
}

.calculator-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.25);
}

/* ================== CALCULATOR TITLE & SUBTITLE ================== */
.calculator-card h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
  color: var(--primary-dark);
  position: relative;
  display: inline-block;
}

.calculator-card h2::after {
  content: '';
  display: block;
  width: 55%;
  height: 4px;
  background: var(--primary);
  margin: 8px auto 0;
  border-radius: 3px;
}

.calculator-card__subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 30px;
}

/* ================== INPUT GROUP ================== */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
  text-align: left;
}

.input-group label {
  font-weight: 600;
  font-size: 0.95rem;
}

.input-group input,
textarea {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--muted);
  font-size: 1rem;
  background: rgba(255,255,255,0.8);
  color: var(--text);
  transition: all 0.3s ease;
}

.input-group input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255,255,255,1);
  box-shadow: 0 0 12px rgba(37,99,235,0.15);
}

/* ================== BUTTON ================== */
#calculateBtn {
  padding: 14px 28px;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  background: var(--gradient);
  color: #fff;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#calculateBtn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 25px rgba(37,99,235,0.4);
}

/* ================== RESULT AREA ================== */
.result-area {
  margin-top: 40px;
  text-align: center;
  font-family: 'Inter', sans-serif;
}

.result-area__details {
  margin-bottom: 25px;
}

/* Gradient + shimmer text */
.dear-text {
  font-size: clamp(1.8rem, 2.3vw, 2.2rem); /* responsive */
  font-weight: 600;
  background: linear-gradient(90deg, #6366f1, #8b5cf6); /* elegant blue-purple */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

/* Shimmer effect */
.dear-text::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, rgba(255,255,255,0.2), rgba(255,255,255,0.4), rgba(255,255,255,0.2));
  transform: skewX(-20deg);
  animation: shimmer 2.5s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}





/* ================== RESULT LIST ================== */
.result-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 20px;
  padding: 0;
}

.result-list li {
  list-style: none;
  background: rgba(37, 99, 235, 0.1);
  padding: 20px 18px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 1.1rem;
  min-width: 120px;
  text-align: center;
  transition: all 0.3s ease;
  color: var(--text);
}

.result-list li span {
  display: block;
  font-size: 1.5rem;
  margin-top: 5px;
  font-weight: 800;
}

.result-list li:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 25px rgba(37, 99, 235, 0.2);
  background: rgba(37, 99, 235, 0.15);
}

/* ================== ERROR DISPLAY ================== */
#errorDisplay {
  margin-top: 20px;
  font-weight: 600;
  color: var(--error);
  background: rgba(254, 226, 226, 0.25);
  padding: 14px;
  border-radius: 12px;
  text-align: center;
  display: none;
}

/* ================== DARK MODE SUPPORT ================== */
[data-theme="dark"] .calculator-card {
  background: linear-gradient(180deg, #111827, #0f172a);
  box-shadow: 0 14px 35px rgba(0,0,0,0.6);
}

[data-theme="dark"] .calculator-card h2 {
  color: #60a5fa;
}

[data-theme="dark"] .calculator-card__subtitle {
  color: #9ca3af;
}

[data-theme="dark"] .input-group input,
[data-theme="dark"] textarea {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.15);
  color: #e5e7eb;
}

[data-theme="dark"] .input-group input:focus,
[data-theme="dark"] textarea:focus {
  background: rgba(255,255,255,0.08);
  border-color: #60a5fa;
  box-shadow: 0 0 12px rgba(96,165,250,0.3);
}

[data-theme="dark"] #calculateBtn {
  background: linear-gradient(135deg, #60a5fa, #3b82f6);
  box-shadow: 0 8px 22px rgba(96,165,250,0.35);
}

[data-theme="dark"] #calculateBtn:hover {
  box-shadow: 0 12px 30px rgba(96,165,250,0.45);
}

[data-theme="dark"] .result-list li {
  background: rgba(96,165,250,0.12);
  color: #e5e7eb;
}

[data-theme="dark"] .result-list li:hover {
  background: rgba(96,165,250,0.2);
  box-shadow: 0 10px 25px rgba(96,165,250,0.25);
}




/* ================== FEATURES CARD ================== */
.features-card {
  max-width: 840px;
  margin: 50px auto;
  padding: 50px 30px;   /* give enough horizontal padding */
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;

  /* Fix for slide animations */
  overflow: visible;  /* allow animated items to stay visible */
}


.features-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.2);
}

/* ================== FEATURES TITLE ================== */
.features-card h2 {
  font-size: 2.2rem;
  margin-bottom: 25px;
  color: var(--primary-dark);
  position: relative;
  display: inline-block;
}

.features-card h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary);
  margin: 8px auto 0;
  border-radius: 3px;
}

/* ================== FEATURES LIST ================== */
.features-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
  padding: 0;
  padding-right: 20px;
  
}

.features-list li {
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(56,189,248,0.06));
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: default;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
  min-width: 0;
}

.features-list li:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 18px 40px rgba(37,99,235,0.22);
  background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(56,189,248,0.12));
}

.features-list i {
  font-size: 1.3rem;
  color: var(--primary);
  flex-shrink: 0;
  min-width: 25px;
}

/* ================== DARK MODE ================== */
[data-theme="dark"] .features-card {
  background: linear-gradient(180deg, #111827, #0f172a);
  box-shadow: 0 14px 35px rgba(0,0,0,0.6);
}

[data-theme="dark"] .features-card h2 {
  color: #60a5fa;
}

[data-theme="dark"] .features-card h2::after {
  background: #60a5fa;
}

[data-theme="dark"] .features-list li {
  background: linear-gradient(135deg, rgba(96,165,250,0.14), rgba(59,130,246,0.1));
}

[data-theme="dark"] .features-list li:hover {
  background: linear-gradient(135deg, rgba(96,165,250,0.2), rgba(59,130,246,0.15));
}

/* ================== SCROLL ANIMATION ================== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  transform: translateX(-20px);
}

.reveal-left.active {
  transform: translateX(0);
}

.reveal-right {
  transform: translateX(20px);
}

.reveal-right.active {
  transform: translateX(0);
}



/* ================== ABOUT SECTION ================== */
#about-section {
  max-width: 780px;
  margin: 60px auto;
  padding: 0 20px;
}

.about-card {
  background: var(--card-bg);
  padding: 45px 35px;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 28px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-align: center;
}

.about-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.about-card h2 {
  font-size: 2.2rem;
  color: var(--primary-dark);
  margin-bottom: 35px;
  font-weight: 700;
  line-height: 1.2;
}

.about-card h2 .highlight-title {
  color: var(--primary);
}

/* Paragraph styling with accent bar */
.about-card .about-text {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 18px;
  line-height: 1.7;
  padding: 12px 18px 12px 24px;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  background: rgba(37,99,235,0.05);
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

/* Hover effect for paragraphs */
.about-card .about-text:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(37,99,235,0.12);
  border-color: var(--primary-dark);
}

/* Fade-up animation */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s forwards;
  animation-delay: 0.2s;
}

.fade-up:nth-child(2) { animation-delay: 0.4s; }
.fade-up:nth-child(3) { animation-delay: 0.6s; }

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

/* Dark Mode */
[data-theme="dark"] #about-section .about-card {
  background: linear-gradient(180deg, #111827, #0f172a);
  box-shadow: 0 10px 25px rgba(0,0,0,0.6);
}

[data-theme="dark"] #about-section .about-card h2 {
  color: var(--primary);
}

[data-theme="dark"] #about-section .about-card h2 .highlight-title {
  color: #facc15; /* bright accent for first two words */
}

[data-theme="dark"] #about-section .about-card .about-text {
  color: var(--muted);
  background: rgba(96,165,250,0.1);
  border-left-color: #60a5fa;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}


/* ================== FAQ CARD ================== */
.faq-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 800px;
  margin: 50px auto;
  padding: 0 0;  /* padding handled in question */
  font-family: 'Inter', sans-serif;
}

.faq-card h2 {
  font-size: 2.3rem;
  color: var(--primary-dark);
  text-align: center;
  margin-bottom: 30px;
}

.faq-card h2 .highlight-title {
  color: var(--primary);
}

.faq-card h2::after {
  content: '';
  display: block;
  width: 70px;
  height: 4px;
color: var(--primary-dark);
  margin: 12px auto 0;
  border-radius: 3px;
}

/* ================== FAQ ITEM ================== */
.faq-item {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin: 0;           
  padding: 0;          /* no padding here */
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(37, 99, 235, 0.12);
}

/* ================== FAQ QUESTION ================== */
.faq-question {
  padding: 18px 22px;      /* all questions start aligned */
  font-weight: 600;
  cursor: pointer;
  position: relative;
  border-left: none;  
  border-radius: 6px;
  transition: background 0.3s ease, color 0.3s ease;
  box-sizing: border-box;   /* fixes alignment issue */
}

.faq-question:hover {
  background: rgba(37, 99, 235, 0.05);
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 22px;
  font-size: 1.4rem;
  transition: transform 0.35s ease, color 0.35s ease;
}

.faq-question.active {
  color: var(--primary);
  border-left: 4px solid var(--primary);
}

.faq-question.active::after {
  transform: rotate(45deg);
  color: var(--primary);
}

/* ================== FAQ ANSWER ================== */
.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 22px;
  opacity: 0;
  transform: translateY(-10px);
  transition: max-height 0.5s ease, opacity 0.5s ease, transform 0.5s ease, padding 0.5s ease;
}


.faq-answer ul {
  padding-left: 20px;
  margin: 8px 0;
  list-style-type: disc;
}

.faq-question.active + .faq-answer {
  max-height: 1000px;   /* can be replaced with JS dynamic height */
  padding: 15px 22px;
  opacity: 1;
  transform: translateY(0);
}

/* ================== DARK MODE ================== */
[data-theme="dark"] .faq-card h2 .highlight-title {
  color: #facc15;
}

[data-theme="dark"] .faq-item {
  background: linear-gradient(180deg, #111827, #0f172a);
  box-shadow: 0 10px 25px rgba(0,0,0,0.6);
}

[data-theme="dark"] .faq-item:hover {
  background: rgba(96,165,250,0.05);
}

[data-theme="dark"] .faq-question {
  color: #e5e7eb;
}

[data-theme="dark"] .faq-question.active {
  color: #60a5fa;
  border-left: 4px solid #60a5fa;
}

[data-theme="dark"] .faq-answer {
  color: #d1d5db;
}

/* ================== RESPONSIVE ================== */
@media (max-width: 768px) {
  .faq-card {
    padding: 0 15px;
  }

  .faq-question {
    padding: 16px 18px;
  }

  .faq-answer {
    padding: 0 18px;
  }

  .faq-card h2 {
    font-size: 2rem;
  }
}

/* ================== SCROLL ANIMATION ================== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  transform: translateX(-20px);
}

.reveal-left.active {
  transform: translateX(0);
}

.reveal-right {
  transform: translateX(20px);
}

.reveal-right.active {
  transform: translateX(0);
}

/* ================== CONTACT CARD ================== */
.contact-card {
  background: var(--card-bg);
  padding: 50px 35px;
  border-radius: var(--radius-lg);
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.25);
  text-align: center;
  max-width: 760px;
  margin: 60px auto;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}

/* Radial glow effect */
.contact-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(37, 99, 235, 0.08), transparent 70%);
  transform: rotate(45deg);
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.contact-card:hover::before {
  opacity: 0.6;
}

/* Card hover lift */
.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 25px 60px rgba(37, 99, 235, 0.3);
}

/* Card title */
.contact-card h2 {
  font-size: 2.4rem;
  margin-bottom: 25px;
  color: var(--primary-dark);
  display: inline-block;
  position: relative;
}

.contact-card h2::after {
  content: '';
  display: block;
  width: 55%;
  height: 4px;
  background: var(--primary);
  margin: 8px auto 0;
  border-radius: 3px;
}

/* Contact info */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 30px;
}

.contact-info p {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
  transition: transform 0.3s ease, color 0.3s ease;
}

.contact-info p:hover {
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.contact-info a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.3s ease, transform 0.3s ease;
}

.contact-info a:hover {
  color: var(--primary-dark);
  transform: translateY(-2px);
}

/* Social links */
.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 35px;
}

.social-icon {
  width: 28px;
  height: 28px;
  opacity: 0.8;
  cursor: pointer;
  border-radius: 50%;
  transition: transform 0.3s ease, filter 0.3s ease, opacity 0.3s ease;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

.social-icon:hover {
  transform: scale(1.5) rotate(-10deg);
  opacity: 1;
  filter: drop-shadow(0 6px 12px rgba(37, 99, 235, 0.4));
  background: linear-gradient(90deg, #60a5fa, #38bdf8, #2563eb, #60a5fa);
  background-size: 300% 300%;
  animation: socialGlow 3s ease infinite;
}

@keyframes socialGlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ================== Animated Premium Signature ================== */
.contact-card::after {
  content: "Developed by Gemachis T.";
  position: absolute;
  bottom: 12px;
  right: 20px;
  font-size: 0.9rem;
  font-style: italic;
  font-weight: 600;
  background: linear-gradient(90deg, #f87171, #38bdf8, #51b310, #60a5fa);
  background-size: 300% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3s infinite linear;
  transition: all 0.5s ease;
}

/* Hover effects with glow & small particle-like sparkles */
.contact-card:hover::after {
  transform: translateY(-6px) rotate(-2deg) scale(1.15);
  text-shadow: 
    0 0 6px #60a5fa, 
    
}

/* Shimmer animation for gradient flow */
@keyframes shimmer {
  0% { background-position: -300% 0; }
  50% { background-position: 300% 0; }
  100% { background-position: -300% 0; }
}


/* ================== DARK MODE SUPPORT ================== */
[data-theme="dark"] .contact-card {
  background: linear-gradient(180deg, #111827, #0f172a);
  box-shadow: 0 14px 35px rgba(0,0,0,0.6);
}

[data-theme="dark"] .contact-card::before {
  background: radial-gradient(circle at center, rgba(96,165,250,0.12), transparent 70%);
}

[data-theme="dark"] .contact-card h2 {
  color: #60a5fa;
}

[data-theme="dark"] .contact-info p {
  color: #e5e7eb;
}

[data-theme="dark"] .contact-info a {
  color: #60a5fa;
}

[data-theme="dark"] .contact-info a:hover {
  color: #3b82f6;
}

[data-theme="dark"] .social-icon {
  filter: invert(1) drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  opacity: 0.75;
}

[data-theme="dark"] .social-links a:hover .social-icon {
  opacity: 1;
}



/* ================== FOOTER ================== */
.footer {
  text-align: center;
  margin-top: 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ================== RESPONSIVE ================== */
@media (max-width: 768px) {
  .result-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .header__nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ================== COLOR HIERARCHY IMPROVEMENT ================== */

h1, h2, h3 {
  letter-spacing: -0.3px;
}

.calculator-card h2,
.about-card h2,
.contact-card h2 {
  color: var(--primary-dark);
}

.input-group label {
  font-size: 0.95rem;
  color: var(--muted);
}

p {
  line-height: 1.65;
}

.result-area {
  color: var(--primary-dark);
  font-weight: 600;
}


/* ================== SOCIAL ICON POLISH ================== */

.social-links {
  gap: 16px;
}

.social-icon {
  width: 22px;     /* smaller */
  height: 22px;
  opacity: 0.7;
}

.social-links a:hover .social-icon {
  transform: translateY(-3px) scale(1.1);
  opacity: 1;
}

/* Dark mode support */
[data-theme="dark"] .social-icon {
  filter: invert(1);
}

/* ================== HAMBURGER ANIMATION ================== */

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.hamburger span {
  width: 26px;
  height: 3px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translateY(8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-8px);
}

/* ================== ACCESSIBILITY & UX ================== */

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* Error feedback animation */
.error-message {
  animation: shake 0.3s ease;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  50% { transform: translateX(4px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

/* ================== PREMIUM UI POLISH ================== */

.content-section.active-section {
  animation: slideFade 0.5s ease;
}

@keyframes slideFade {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Card hover life */
.calculator-card,
.about-card,
.contact-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator-card:hover,
.about-card:hover,
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(37,99,235,0.2);
}


/* ================== DARK MODE POLISH ================== */
[data-theme="dark"] {

  /* Background layers */
  --bg: #0b1020;
  --card-bg: #111827;

  /* Text */
  --text: #e5e7eb;
  --muted: #9ca3af;

  /* Brand colors (slightly softer) */
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
}

/* ================== CARDS ================== */
[data-theme="dark"] .calculator-card,
[data-theme="dark"] .about-card,
[data-theme="dark"] .contact-card,
[data-theme="dark"] .faq-item {
  background: linear-gradient(
    180deg,
    #111827,
    #0f172a
  );
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
}

/* ================== HEADER ================== */
[data-theme="dark"] .header {
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,0.06);
}

/* ================== INPUTS ================== */
[data-theme="dark"] input,
[data-theme="dark"] textarea {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.15);
  color: var(--text);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
  color: #9ca3af;
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus {
  background: rgba(255,255,255,0.08);
  border-color: var(--primary);
}

/* ================== BUTTON ================== */
[data-theme="dark"] .btn--primary {
  box-shadow: 0 8px 22px rgba(96,165,250,0.35);
}

[data-theme="dark"] .btn--primary:hover {
  box-shadow: 0 12px 30px rgba(96,165,250,0.45);
}

/* ================== RESULT AREA ================== */
[data-theme="dark"] .result-list li {
  background: rgba(96,165,250,0.12);
}

/* ================== FAQ ================== */
[data-theme="dark"] .faq-question {
  color: #93c5fd;
}

[data-theme="dark"] .faq-answer {
  color: #d1d5db;
}

/* ================== CONTACT INFO ================== */
[data-theme="dark"] .contact-info a {
  color: #93c5fd;
}

[data-theme="dark"] .contact-info {
  color: #d1d5db;
}

/* ================== SOCIAL ICONS ================== */
[data-theme="dark"] .social-icon {
  filter: invert(1);
  opacity: 0.75;
}

[data-theme="dark"] .social-links a:hover .social-icon {
  opacity: 1;
}

/* ================== FOOTER ================== */
[data-theme="dark"] .footer {
  color: #9ca3af;
}

/* ================== SCROLLBAR (nice touch) ================== */
[data-theme="dark"] ::-webkit-scrollbar {
  width: 10px;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: #0b1020;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #1e293b;
  border-radius: 10px;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #334155;
}

/* ===== Sticky Footer Fix ===== */
html, body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.content-sections {
  flex: 1;
}

.footer {
  margin-top: auto;
  padding: 16px 0;
}

/* ===== Date input icon visible in dark mode ===== */
[data-theme="dark"] input[type="date"] {
  color-scheme: dark;
}

/* ===== About Card Enhancement ===== */
.about-card {
  max-width: 720px;
  margin: 0 auto;
  min-height: 220px;
}

/* ===== FAQ Layout Improvement ===== */
.faq-card {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  min-height: 70px;
}

/* ===== Contact Section Clean UI ===== */
.contact-card {
  max-width: 760px;
  margin: 0 auto;
}

.contact-info {
  margin-top: 24px;
  gap: 8px;
}

.contact-info p {
  font-size: 0.95rem;
}




@media (max-width: 768px) {
  .header__nav {
    display: none;
  }

  .header__nav.active {
    display: block;
  }

  .header__nav ul {
    flex-direction: column;
    gap: 20px;
  }

  .hamburger {
    display: flex;
  }
}

@media (max-width: 768px) {
  
}