/* ============================================
   Main Styles - SkillsRepo
   ============================================ */

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  color: var(--text-secondary);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-emerald);
}

.mono {
  font-family: var(--font-mono);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ============================================
   Full-Page Canvas Background
   ============================================ */
.page-canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-background);
  pointer-events: none;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
}

.hero__content {
  position: relative;
  z-index: var(--z-card);
  max-width: 800px;
  padding: var(--space-12);
}

.hero__logo {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--accent-emerald);
  margin-bottom: var(--space-8);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-shadow:
    0 0 10px rgba(52, 211, 153, 0.5),
    0 0 4px rgba(0, 0, 0, 1),
    0 0 8px rgba(0, 0, 0, 1),
    0 0 16px rgba(0, 0, 0, 1),
    0 0 32px rgba(0, 0, 0, 1),
    0 0 50px rgba(0, 0, 0, 0.9);
  animation: logoReveal 1s ease-out 0.2s both;
}

@keyframes logoReveal {
  0% {
    opacity: 0;
    letter-spacing: 0.8em;
    filter: blur(10px);
  }
  50% {
    opacity: 1;
    filter: blur(0);
  }
  100% {
    opacity: 1;
    letter-spacing: 0.2em;
    filter: blur(0);
  }
}

.hero__tagline {
  font-size: var(--text-6xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  background: linear-gradient(
    90deg,
    var(--accent-emerald),
    var(--accent-cyan),
    var(--accent-blue),
    var(--accent-cyan),
    var(--accent-emerald)
  );
  background-size: 300% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter:
    drop-shadow(0 0 5px rgba(0, 0, 0, 1))
    drop-shadow(0 0 15px rgba(0, 0, 0, 1))
    drop-shadow(0 0 30px rgba(0, 0, 0, 0.9))
    drop-shadow(0 0 50px rgba(0, 0, 0, 0.7));
  animation: taglineReveal 0.8s ease-out 0.6s both, gradientFlow 8s ease-in-out infinite;
  animation-delay: 0.6s, 1.5s;
}

@keyframes taglineReveal {
  0% {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

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

.hero__tagline .cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent-emerald);
  margin-left: 4px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

.hero__subtext {
  font-size: var(--text-xl);
  color: #c5cdd8;
  max-width: 800px;
  margin: 0 auto var(--space-10);
  line-height: var(--leading-relaxed);
  text-shadow:
    0 0 5px rgba(0, 0, 0, 1),
    0 0 10px rgba(0, 0, 0, 1),
    0 0 20px rgba(0, 0, 0, 1),
    0 0 35px rgba(0, 0, 0, 1),
    0 0 50px rgba(0, 0, 0, 1),
    0 0 70px rgba(0, 0, 0, 0.9);
  animation: subtextReveal 0.8s ease-out 2s both;
}

@keyframes subtextReveal {
  0% {
    opacity: 0;
    transform: translateY(30px);
    filter: blur(4px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
  text-shadow:
    0 0 10px rgba(0, 0, 0, 1),
    0 0 20px rgba(0, 0, 0, 1),
    0 0 40px rgba(0, 0, 0, 1);
  animation: ctaReveal 0.6s ease-out 2.8s both, float 3s ease-in-out 3.4s infinite;
}

@keyframes ctaReveal {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__cta svg {
  width: 20px;
  height: 20px;
  animation: bounce 2s ease-in-out infinite;
}

/* ============================================
   Skill Types Section
   ============================================ */
.skills {
  background: var(--bg-secondary);
  position: relative;
}

.skills::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.skills__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.skills__header h2 {
  margin-bottom: var(--space-4);
}

.skills__header p {
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-primary);
}

.skill-card {
  background: rgba(5, 5, 8, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
}

.skill-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(52, 211, 153, 0.08),
    transparent
  );
  transition: left 0.6s ease;
  pointer-events: none;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-emerald);
  box-shadow: 0 0 30px rgba(52, 211, 153, 0.2), 0 10px 40px rgba(0, 0, 0, 0.4);
}

.skill-card:hover::after {
  left: 100%;
}

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

.skill-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-5);
  color: var(--accent-cyan);
}

.skill-card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.skill-card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.skill-card__examples {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.skill-card__examples span {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: rgba(16, 185, 129, 0.1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin: var(--space-1);
}

/* ============================================
   Skill Anatomy - File Tree + Preview
   ============================================ */
.skill-anatomy {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (max-width: 900px) {
  .skill-anatomy {
    grid-template-columns: 1fr;
  }
}

.skill-anatomy__tree {
  background: rgba(5, 5, 8, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.skill-anatomy__tree:hover {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 25px rgba(52, 211, 153, 0.15);
}

.tree-header {
  background: rgba(52, 211, 153, 0.1);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
  color: var(--accent-emerald);
  font-weight: 500;
}

.tree-content {
  padding: var(--space-4);
}

.tree-item {
  padding: var(--space-1) 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: background var(--transition-fast);
  margin: 0 calc(-1 * var(--space-4));
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.tree-item:hover {
  background: rgba(52, 211, 153, 0.05);
}

.tree-item.tree-indent {
  padding-left: calc(var(--space-4) + var(--space-6));
}

.tree-item.tree-indent::before {
  content: '├─';
  color: var(--text-muted);
  opacity: 0.4;
  margin-right: var(--space-1);
}

.tree-file {
  color: var(--text-secondary);
}

.tree-file.tree-main {
  color: var(--accent-cyan);
  font-weight: 500;
}

.tree-folder {
  color: var(--accent-emerald);
}

.tree-arrow {
  color: var(--text-muted);
  font-size: var(--text-xs);
}

.tree-comment {
  color: var(--text-muted);
  font-size: var(--text-xs);
}

.skill-anatomy__preview {
  background: rgba(5, 5, 8, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 13px;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.skill-anatomy__preview:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.15);
}

.preview-header {
  background: rgba(34, 211, 238, 0.1);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
  color: var(--accent-cyan);
  font-weight: 500;
}

.preview-content {
  padding: var(--space-4);
  margin: 0;
  overflow-x: auto;
  line-height: 1.6;
  color: var(--text-secondary);
}

.preview-content code {
  font-family: var(--font-mono);
}

.code-frontmatter {
  color: var(--text-muted);
}

.code-heading {
  color: var(--accent-emerald);
  font-weight: 500;
}

.code-list {
  color: var(--accent-cyan);
}

.code-bullet {
  color: var(--accent-cyan);
}

.code-ref {
  color: var(--text-muted);
  font-style: italic;
}

.skill-anatomy__caption {
  text-align: center;
  font-size: var(--text-base);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Why It Matters Section
   ============================================ */
.vision {
  position: relative;
}

.vision__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 768px) {
  .vision__content {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

.vision__text {
}

.vision__text h2 {
  margin-bottom: var(--space-6);
}

.vision__statement {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

.vision__quote {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--accent-emerald);
  margin-top: var(--space-6);
  font-weight: 500;
}

.vision__props {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.prop {
  background: rgba(5, 5, 8, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all 0.3s ease;
}

.prop:hover {
  border-color: var(--accent-cyan);
  background: rgba(10, 10, 15, 0.9);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.15);
  transform: translateX(4px);
}

.prop__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-cyan);
  margin-bottom: var(--space-2);
}

.prop__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.prop__text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ============================================
   Contribution Form Section
   ============================================ */
.contribute {
  background: var(--bg-secondary);
  position: relative;
}

.contribute::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.contribute__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.contribute__header h2 {
  margin-bottom: var(--space-4);
}

.contribute__header p {
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-primary);
}

.form-container {
  max-width: 640px;
  margin: 0 auto;
  background: rgba(5, 5, 8, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
}

.form-group {
  margin-bottom: var(--space-6);
}

#other-platform-group {
  transition: opacity var(--transition-base);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-group .hint {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent-emerald);
  box-shadow: 0 0 0 3px var(--glow-emerald);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23a0a0a0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  background-size: 16px;
  padding-right: var(--space-12);
}

.radio-group {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.radio-option {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
}

.radio-option input {
  appearance: none;
  width: 14px;
  height: 14px;
  min-width: 14px;
  min-height: 14px;
  border: 2px solid var(--border-subtle);
  border-radius: 50%;
  background: var(--bg-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin: 0;
  flex-shrink: 0;
  transform: translateY(2px);
}

.radio-option input:checked {
  border-color: var(--accent-emerald);
  background: var(--accent-emerald);
  box-shadow: inset 0 0 0 2px var(--bg-tertiary);
}

.radio-option span {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-left: 8px;
}

.submit-btn {
  width: 100%;
  background: var(--gradient-hero);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--bg-primary);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(52, 211, 153, 0.4), 0 5px 20px rgba(0, 0, 0, 0.3);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.submit-btn .loading {
  display: none;
}

.submit-btn.is-loading .loading {
  display: inline-block;
}

.submit-btn.is-loading .text {
  visibility: hidden;
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top-color: var(--bg-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.form-feedback {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  text-align: center;
  display: none;
}

.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent-emerald);
  color: var(--accent-emerald);
}

.form-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #ef4444;
  color: #ef4444;
}

/* ============================================
   Other Inquiries Section
   ============================================ */
.inquiries {
  padding: var(--space-16) 0;
}

.inquiries__content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.inquiries__title {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

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

.inquiries__input {
  flex: 1;
  max-width: 280px;
}

.inquiries__btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.inquiries__btn:hover {
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.inquiries__btn .loading {
  display: none;
}

.inquiries__btn.is-loading .loading {
  display: inline-block;
}

.inquiries__btn.is-loading .text {
  visibility: hidden;
}

.inquiry-feedback {
  margin-top: var(--space-4);
}

@media (max-width: 500px) {
  .inquiries__form {
    flex-direction: column;
    align-items: center;
  }

  .inquiries__input {
    max-width: 100%;
    width: 100%;
  }
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--space-12) 0;
  text-align: center;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
}

.footer__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-emerald);
  margin-bottom: var(--space-4);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

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

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .page-canvas {
    opacity: 0.15;
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}