/* ==================== 1. Global ==================== */

/* Color Palette & Typography Variables */
:root {
  /* Colors */
  --primary-dark: #0F172A;
  --primary-navy: #1E293B;
  --primary-blue: #3B82F6;
  --accent-teal: #06B6D4;
  --bg-lighter: #F1F5F9;
  --bg-gray: #E2E8F0;
  --text-dark: #0F172A;
  --text-gray: #64748B;
  --text-light: #94A3B8;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.12);

  /* Typography */
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background-color: var(--white);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--primary-blue);
  color: var(--white);
}

::-moz-selection {
  background: var(--primary-blue);
  color: var(--white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--primary-navy);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
}

h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

h3 {
  font-size: 1.75rem;
  font-weight: 600;
}

h4 {
  font-size: 1.5rem;
  font-weight: 600;
}

h5 {
  font-size: 1.25rem;
  font-weight: 600;
}

h2.font-weight-bold {
  position: relative;
  display: inline-block;
  font-weight: 700;
  letter-spacing: 2px;
}

h2.font-weight-bold::before {
  content: '';
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-teal));
  border-radius: 2px;
}

h2.font-weight-bold::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-teal));
  border-radius: 2px;
}

.lead {
  color: var(--text-gray);
  font-size: 1.15rem;
  font-weight: 400;
  line-height: 1.7;
}

p {
  font-family: var(--font-body);
  line-height: 1.7;
  margin-bottom: 1rem;
}

/* ==================== 2. Layout ==================== */

/* Scroll Offset for Fixed Navbar */
section[class*="container-fluid"] {
  scroll-margin-top: 100px;
}

[id$="_anchor"] {
  scroll-margin-top: 100px;
}

/* Navbar */
.navbar {
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95) !important;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.98) !important;
}

.navbar-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  animation: slideDown 0.4s ease;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.custom-text {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--primary-navy);
  transition: all 0.3s ease;
  position: relative;
  padding-bottom: 5px;
}

.custom-text::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-teal));
  transition: transform 0.3s ease;
}

.custom-text:hover {
  color: var(--primary-blue);
  text-decoration: none;
}

.custom-text:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.custom-text.active {
  color: var(--primary-blue);
}

.custom-text.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Jumbotron / Hero */
.jumbotron {
  height: 80vh;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  margin-top: 72px;
  position: relative;
}

.jumbotron::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(248, 250, 252, 0.35);
  pointer-events: none;
  z-index: 0;
}

.jumbotron > div {
  position: relative;
  z-index: 1;
}

/* ==================== 3. Components ==================== */

/* Typing Effect */
@keyframes typing {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

.typing-container {
  display: block;
  align-items: center;
}

.typing-effect {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  width: 0;
}

.typing-issei {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: 12px;
  animation: typing 2s steps(20, end), step-end infinite;
  animation-fill-mode: forwards;
  animation-iteration-count: 1;
}

.typing-portfolio {
  font-family: var(--font-body);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 4px;
  animation: typing 2s steps(20, end) 2.5s, step-end infinite 2.5s;
  animation-fill-mode: forwards;
  animation-iteration-count: 1;
}

/* Cards */
.card-image-top {
  width: 100%;
  max-width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
}

.card {
  border: none;
  box-shadow: var(--shadow-sm);
  border-radius: 16px;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  background: var(--white);
  padding: 1.5rem;
  text-align: center;
}

.jumbotron.card {
  background-color: transparent;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  box-shadow: none;
  padding: 0;
}

.card .card-body {
  padding: 0;
}

.card .card-image-top {
  transition: transform 0.4s ease, filter 0.4s ease;
  margin: 0 auto 1rem;
  filter: grayscale(20%);
}

.card-title {
  font-family: var(--font-heading);
  color: var(--primary-navy);
  font-weight: 600;
  font-size: 1.1rem;
}

.card-projects {
  position: relative;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
  border: none;
  box-shadow: var(--shadow-sm);
  border-radius: 16px;
  overflow: hidden;
  background: var(--white);
}

.card-projects::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 1;
}

.card-projects:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.2);
}

.card-projects:hover::before {
  opacity: 1;
}

.card-projects .card-img-top {
  transition: transform 0.4s ease;
}

.card-projects:hover .card-img-top {
  transform: scale(1.1);
}

.card-projects .card-body {
  position: relative;
  z-index: 2;
  background: var(--white);
}

.card-projects .card-title {
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

.card-projects:hover .card-title {
  color: var(--primary-blue);
}

.card-description {
  font-size: 0.9rem;
  color: var(--text-gray);
  line-height: 1.6;
}

/* Project Badge */
.project-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-teal));
  color: var(--white);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.5rem;
  transition: all 0.3s ease;
}

.card-projects:hover .project-badge {
  transform: translateX(5px);
}

/* Social Icons */
.social-icon-link {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  transition: transform 0.3s ease;
}

.social-icon-link:hover {
  transform: translateY(-8px);
}

.social-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--primary-navy);
  box-shadow: var(--shadow-md);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
}

.social-icon::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-teal));
  opacity: 0;
  transition: opacity 0.4s ease;
}

.social-icon i {
  position: relative;
  z-index: 1;
  transition: all 0.4s ease;
}

.social-icon-link:hover .social-icon {
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
  transform: scale(1.1) rotate(5deg);
}

.social-icon-link:hover .social-icon::before {
  opacity: 1;
}

.social-icon-link:hover .social-icon i {
  color: var(--white);
  transform: scale(1.2);
}

.social-label {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
  opacity: 0.9;
  transition: all 0.3s ease;
}

.social-icon-link:hover .social-label {
  opacity: 1;
  color: var(--accent-teal);
}

/* Profile Image */
.profile-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 350px;
  text-align: center;
}

.profile-image-wrapper img {
  box-shadow: var(--shadow-md);
}

.profile-image-caption {
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--primary-blue);
  font-weight: 600;
  font-family: var(--font-heading);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: color 0.3s ease;
}

a.profile-image-caption {
  text-decoration: none;
}

a.profile-image-caption:hover {
  color: var(--accent-teal);
}

.profile-image-caption i {
  font-size: 1.1rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--primary-blue), var(--accent-teal));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: 1.5rem;
  margin-bottom: 1rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.3rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background: var(--white);
  border: 3px solid var(--primary-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.timeline-item:hover::before {
  background: var(--primary-blue);
  transform: scale(1.3);
  transition: all 0.3s ease;
}

.timeline-company {
  font-weight: 600;
  color: var(--primary-navy);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.timeline-role {
  color: var(--primary-blue);
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.timeline-date {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timeline-date i {
  color: var(--accent-teal);
}

/* Section Wave */
.section-wave {
  position: relative;
  padding-top: 3rem;
}

.section-wave::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3rem;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M0,0V46.29c47.79,22.2,103.59,32.17,158,28,70.36-5.37,136.33-33.31,206.8-37.5C438.64,32.43,512.34,53.67,583,72.05c69.27,18,138.3,24.88,209.4,13.08,36.15-6,69.85-17.84,104.45-29.34C989.49,25,1113-14.29,1200,52.47V0Z' opacity='.25' fill='%233B82F6'/%3E%3Cpath d='M0,0V15.81C13,36.92,27.64,56.86,47.69,72.05,99.41,111.27,165,111,224.58,91.58c31.15-10.15,60.09-26.07,89.67-39.8,40.92-19,84.73-46,130.83-49.67,36.26-2.85,70.9,9.42,98.6,31.56,31.77,25.39,62.32,62,103.63,73,40.44,10.79,81.35-6.69,119.13-24.28s75.16-39,116.92-43.05c59.73-5.85,113.28,22.88,168.9,38.84,30.2,8.66,59,6.17,87.09-7.5,22.43-10.89,48-26.93,60.65-49.24V0Z' opacity='.5' fill='%233B82F6'/%3E%3Cpath d='M0,0V5.63C149.93,59,314.09,71.32,475.83,42.57c43-7.64,84.23-20.12,127.61-26.46,59-8.63,112.48,12.24,165.56,35.4C827.93,77.22,886,95.24,951.2,90c86.53-7,172.46-45.71,248.8-84.81V0Z' fill='%233B82F6'/%3E%3C/svg%3E") no-repeat;
  background-size: cover;
  opacity: 0.1;
}

/* Scroll Animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Project Item */
.project-item {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Show More/Less Buttons */
#showMoreBtn,
#showLessBtn,
#showMoreWorkBtn,
#showLessWorkBtn {
  font-weight: 600;
  letter-spacing: 1px;
  transition: all 0.3s ease;
  border-radius: 30px;
  border: 2px solid var(--primary-navy);
  background-color: transparent;
  color: var(--primary-navy);
}

#showMoreBtn:hover,
#showMoreWorkBtn:hover {
  background-color: var(--primary-navy);
  color: var(--white);
  border-color: var(--primary-navy);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#showLessBtn:hover,
#showLessWorkBtn:hover {
  background-color: var(--bg-lighter);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* IsseiGPT section - use full available height so chat area can expand */
.issei-gpt-section {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.issei-gpt-section .container.h-100 {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.issei-gpt-section .row.h-100 {
  flex: 1;
  min-height: 0;
}

/* Chat Area (IsseiGPT) - fills remaining space, scrollable */
#chatArea {
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
  padding-right: 0.25rem;
}

/* Chat Bubbles (IsseiGPT) */
.chat-bubble {
  max-width: 80%;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  margin-bottom: 0.5rem;
  word-break: break-word;
  font-size: 1rem;
}

.chat-bubble-user {
  background: #e3f0ff;
  color: #0d223a;
  border-bottom-right-radius: 0.2rem;
}

.chat-bubble-ai {
  background: #fff;
  color: #222;
  border-bottom-left-radius: 0.2rem;
}

.chat-bubble-error {
  background: #ffe6e6;
  color: #d32f2f;
  border: 1px solid #ffcdd2;
  border-bottom-left-radius: 0.2rem;
}

/* IsseiGPT Form */
#questionForm {
  gap: 1rem !important;
}

#questionForm .d-flex.gap-2 {
  gap: 0.5rem !important;
}

#questionForm input[type="text"] {
  min-width: 0;
  flex-basis: 0;
  flex-grow: 1;
  margin-right: 0;
}

#questionForm button {
  min-width: 110px;
}

/* ==================== 4. Utility ==================== */

.py-6 {
  padding-top: 4rem !important;
  padding-bottom: 4rem !important;
}

.text-muted {
  color: var(--text-gray) !important;
  font-size: 0.95rem;
}

::-webkit-scrollbar {
  width: 10px;
  background: var(--bg-lighter);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-blue);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-teal);
}

/* ==================== 5. Media Queries ==================== */

/* Mobile: max-width 767px */
@media (max-width: 767px) {
  .navbar-fixed {
    padding: 0.75rem 0;
  }

  .jumbotron {
    margin-top: 60px;
  }

  .jumbotron > div {
    padding-left: 1rem;
    padding-right: 1rem;
    max-width: 100%;
    box-sizing: border-box;
  }

  .typing-issei {
    font-size: 1.75rem;
    letter-spacing: 4px;
  }

  .typing-portfolio {
    font-size: 1rem;
    letter-spacing: 2px;
  }

  .custom-text {
    font-size: 1rem;
  }

  .profile-image-wrapper {
    max-width: 250px;
    margin-bottom: 2rem;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-item::before {
    left: -1.8rem;
  }

  .social-icon {
    width: 70px;
    height: 70px;
    font-size: 1.75rem;
  }
}

/* Mobile/Tablet: max-width 991px - Navbar collapsed state */
@media (max-width: 991px) {
  .navbar-collapse {
    background: var(--white);
    padding: 1rem;
    margin-top: 1rem;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
  }

  .nav-item {
    border-bottom: 1px solid var(--bg-gray);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .custom-text::after {
    display: none;
  }

  .custom-text.active {
    background: none;
    border-left: none;
    color: var(--primary-navy);
  }

  .custom-text {
    display: block;
    padding: 0.75rem 1rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    transition: all 0.3s ease;
  }

  .custom-text:hover {
    background: var(--bg-lighter);
  }
}

/* Tablet and up: min-width 768px */
@media (min-width: 768px) {
  section[class*="container-fluid"] {
    scroll-margin-top: 120px;
  }

  [id$="_anchor"] {
    scroll-margin-top: 120px;
  }

  .py-6 {
    padding-top: 6rem !important;
    padding-bottom: 6rem !important;
  }

  .typing-issei {
    font-size: 4rem;
    letter-spacing: 14px;
  }

  .typing-portfolio {
    font-size: 2rem;
    letter-spacing: 5px;
  }

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.75rem;
  }
}

/* Desktop: min-width 1200px */
@media (min-width: 1200px) {
  section[class*="container-fluid"] {
    scroll-margin-top: 130px;
  }

  [id$="_anchor"] {
    scroll-margin-top: 130px;
  }

  .py-6 {
    padding-top: 7rem !important;
    padding-bottom: 7rem !important;
  }

  .typing-issei {
    font-size: 6rem;
    letter-spacing: 16px;
  }

  .typing-portfolio {
    font-size: 3rem;
    letter-spacing: 6px;
  }

  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 3rem;
  }
}