/* ============================================
   PAKTAXCALC - DARK THEME DESIGN SYSTEM
   Professional Black & Green Aesthetic
   ============================================ */

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #141414;
  --bg-hover: #1a1a1a;
  --green-primary: #10b981;
  --green-light: #34d399;
  --green-dark: #059669;
  --green-glow: rgba(16, 185, 129, 0.3);
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border: #27272a;
  --border-light: #3f3f46;
}

/* Animations */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px var(--green-glow); }
  50% { box-shadow: 0 0 40px var(--green-glow), 0 0 60px rgba(16, 185, 129, 0.2); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Scroll Animation Classes */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Header & Navigation */
.dark-header {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-link {
  color: var(--text-secondary);
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--green-light);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--green-primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Hamburger Animation */
.hamburger {
  width: 24px;
  height: 18px;
  position: relative;
  cursor: pointer;
}

.hamburger span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 8px; }
.hamburger span:nth-child(3) { top: 16px; }

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

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

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

/* Hero Section */
.dark-hero {
  background: linear-gradient(135deg, var(--bg-primary) 0%, #0f1f1a 50%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.dark-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(16, 185, 129, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-title span {
  background: linear-gradient(135deg, var(--green-light) 0%, var(--green-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn-green {
  background: linear-gradient(135deg, var(--green-primary) 0%, var(--green-dark) 100%);
  color: white;
  padding: 0.875rem 2rem;
  border-radius: 0.75rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-outline {
  border: 2px solid var(--border-light);
  color: var(--text-primary);
  padding: 0.875rem 2rem;
  border-radius: 0.75rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  border-color: var(--green-primary);
  color: var(--green-light);
}

/* Calculator Cards */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.calc-card:hover {
  border-color: var(--green-primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(16, 185, 129, 0.15);
}

.calc-card .icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* Calculator Tabs */
.calc-tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.calc-tab:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
}

.calc-tab.active {
  background: var(--green-primary);
  border-color: var(--green-primary);
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

/* Section Styling */
.dark-section {
  background: var(--bg-primary);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--green-primary), var(--green-dark));
  margin-top: 0.75rem;
  border-radius: 2px;
}

/* Inputs */
.dark-input {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.dark-input:focus {
  outline: none;
  border-color: var(--green-primary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* FAQ Section */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-item summary {
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "";
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  margin-left: 1rem;
  border-right: 2px solid var(--green-primary);
  border-bottom: 2px solid var(--green-primary);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(-135deg) translateY(2px);
}

/* Footer */
.dark-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

/* Mobile Menu */
.mobile-menu {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

/* Animation Utilities */
.fade-in { animation: fadeIn 0.6s ease forwards; }
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.slide-in { animation: slideIn 0.5s ease forwards; }
.glow-pulse { animation: glowPulse 2s ease-in-out infinite; }

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }

/* Slide Tabs Navigation */
.slide-tabs-container {
  position: relative;
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 9999px;
  padding: 4px;
  backdrop-filter: blur(10px);
}

.slide-tabs-cursor {
  position: absolute;
  height: calc(100% - 8px);
  background: #10b981;
  border-radius: 9999px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 0;
  top: 4px;
}

.slide-tab {
  position: relative;
  z-index: 1;
  padding: 8px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.slide-tab:hover {
  color: #ffffff;
}

.slide-tab.active {
  color: #ffffff;
}

/* Calculator Tabs Container - Slide Tabs Style */
.calc-tabs-wrapper {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 9999px;
    padding: 4px;
    overflow: visible;
    max-width: 100%;
}

.calc-tabs-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: 2px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y;
    scroll-behavior: smooth;
    width: 100%;
}

.calc-tabs-container::-webkit-scrollbar {
    display: none;
}

.calc-tabs-cursor {
    position: absolute;
    height: calc(100% - 8px);
    background: var(--green-primary);
    border-radius: 9999px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
    top: 4px;
    opacity: 0;
}

/* Disable cursor animation on mobile to prevent glitches */
@media (max-width: 768px) {
    .calc-tabs-cursor {
        display: none !important;
    }
    
    .calc-tab.active-tab {
        background: var(--green-primary);
    }
}

.calc-tab {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: 9999px;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
    white-space: nowrap;
    z-index: 1;
}

.calc-tab:hover {
    color: #ffffff;
}

.calc-tab.active-tab {
    color: var(--bg-primary);
}

.calc-tab.active-tab:hover {
    color: var(--bg-primary);
}

/* Calculator Form Card */
.calc-form-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.calc-result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.calc-form-card::before,
.calc-result-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(52, 211, 153, 0.55) 18%, rgba(255,255,255,0.18) 50%, rgba(52, 211, 153, 0.55) 82%, transparent 100%);
}

.calc-panel-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.calc-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(52, 211, 153, 0.18);
    color: var(--green-light);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.calc-help-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.65;
}

.calc-micro-grid {
    display: grid;
    gap: 0.75rem;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    margin: 1rem 0 1.25rem;
}

.calc-stat-card {
    background:
        radial-gradient(circle at top right, rgba(16, 185, 129, 0.14), transparent 55%),
        rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0.95rem;
    padding: 0.9rem 1rem;
}

.calc-stat-label {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.35rem;
}

.calc-stat-value {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
}

.calc-inline-note {
    margin-top: 0.55rem;
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.55;
}

.calc-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 1rem 0 1.25rem;
}

.calc-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 0.8rem;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.calc-note-card {
    background:
        linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(16, 185, 129, 0.03)),
        var(--bg-secondary);
    border: 1px solid rgba(52, 211, 153, 0.18);
    border-radius: 1rem;
    padding: 1rem;
    margin-top: 1rem;
}

.calc-note-title {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.calc-note-copy {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
}

.calc-input-group {
    margin-bottom: 1.25rem;
}

.calc-label {
    display: block;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.calc-input,
.calc-select {
    width: 100%;
    padding: 0.9rem 1rem;
    background:
        linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01)),
        #161616;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.9rem;
    color: #ffffff;
    font-size: 1rem;
    transition: all 0.25s ease;
    min-height: 56px;
}

.calc-input::placeholder {
    color: #9ca3af;
}

.calc-input:focus,
.calc-select:focus {
    outline: none;
    border-color: var(--green-primary);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.11), 0 16px 36px rgba(16, 185, 129, 0.08);
    transform: translateY(-1px);
}

.calc-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.25rem;
    padding-right: 2.5rem;
}

.calc-select option {
    background: #1a1a1a;
    color: #ffffff;
}

/* Calculator Results */
.calc-result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.calc-result-row:last-child {
    border-bottom: none;
}

.calc-result-box {
    background:
        radial-gradient(circle at top right, rgba(16, 185, 129, 0.1), transparent 60%),
        var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
}

.calc-result-highlight {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.1rem;
    background:
        radial-gradient(circle at top right, rgba(52, 211, 153, 0.18), transparent 55%),
        linear-gradient(135deg, rgba(16, 185, 129, 0.11) 0%, rgba(16, 185, 129, 0.04) 100%);
    border: 1px solid rgba(16, 185, 129, 0.28);
    border-radius: 1rem;
    margin: 1rem 0;
}

.calc-breakdown-list {
    display: grid;
    gap: 0.8rem;
    margin-top: 1rem;
}

.calc-breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 0.9rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.calc-breakdown-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.calc-breakdown-item span {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.calc-breakdown-value {
    color: var(--text-primary);
    font-weight: 700;
    white-space: nowrap;
}

.calc-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    align-items: center;
    margin-top: 1.1rem;
}

.calc-action-row .btn-green {
    flex: 1 1 240px;
}

.calc-footnote {
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.55;
}

@media (max-width: 768px) {
    .calc-form-card,
    .calc-result-card {
        padding: 1.15rem;
        border-radius: 1.1rem;
    }

    .calc-panel-head {
        flex-direction: column;
    }

    .calc-result-highlight {
        align-items: flex-start;
        flex-direction: column;
    }
}

/* Calculator Card Styles */
.calc-card-icon {
    width: 48px;
    height: 48px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--green-primary);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.calc-card:hover .calc-card-icon {
    background: var(--green-primary);
    color: white;
}

.calc-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.calc-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.calc-card-arrow {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--green-primary);
}