/* ─── Base Reset ─── */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; font-weight: normal; }
p { overflow-wrap: break-word; }
:focus-visible { outline: 2px solid var(--color-accent-secondary); outline-offset: 2px; border-radius: var(--radius-sm); }

/* ─── Animations ─── */

@keyframes fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.stagger.visible > * { opacity: 1; transform: translateY(0); }
.stagger.visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger.visible > *:nth-child(2) { transition-delay: 80ms; }
.stagger.visible > *:nth-child(3) { transition-delay: 160ms; }
.stagger.visible > *:nth-child(4) { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal, .stagger > * { opacity: 1; transform: none; }
}

/* ─── Components ─── */

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.container-narrow {
  width: 100%;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  background: rgba(245, 244, 242, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--transition-base), background var(--transition-base);
}

[data-theme="dark"] .nav {
  background: rgba(13, 13, 14, 0.85);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-variation-settings: 'SOFT' 50;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-overlay);
}

.nav-theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
  margin-left: var(--space-1);
}

.nav-theme-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-overlay);
}

.nav-theme-btn svg {
  width: 16px;
  height: 16px;
}

.nav-mobile-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
}

.nav-mobile-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-overlay);
}

.nav-mobile-btn svg {
  width: 20px;
  height: 20px;
  overflow: visible;
}

.hamburger-line {
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease;
  transform-origin: center;
}

.is-open .hamburger-line.top {
  transform: translateY(5px) rotate(45deg);
}

.is-open .hamburger-line.mid {
  opacity: 0;
}

.is-open .hamburger-line.bot {
  transform: translateY(-5px) rotate(-45deg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-text-primary);
  color: var(--color-bg);
}

.btn-primary:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-border-hover);
  background: var(--color-overlay);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  color: var(--color-text-primary);
}

.btn-accent {
  background: var(--color-accent);
  color: white;
}

.btn-accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-sm {
  font-size: var(--text-xs);
  padding: 0.5rem 1rem;
}

.btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-code-bg);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Portrait */
.portrait {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-lg);
  background: var(--color-border);
  overflow: hidden;
}

.portrait-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-code-bg);
  color: var(--color-text-tertiary);
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Form */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast);
}

.form-input:hover,
.form-textarea:hover {
  border-color: var(--color-border-hover);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent-secondary);
}

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

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

/* Social links */
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-hover);
  background: var(--color-overlay);
}

.social-link svg {
  width: 16px;
  height: 16px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* Selection */
::selection {
  background: var(--color-accent-secondary);
  color: var(--color-bg);
}

/* Toast */
.toast {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 50;
  padding: var(--space-4) var(--space-6);
  background: var(--color-text-primary);
  color: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  transform: translateY(120%);
  opacity: 0;
  transition: all var(--transition-base);
}

.toast.visible {
  transform: translateY(0);
  opacity: 1;
}

.toast-success {
  background: var(--color-accent-secondary);
  color: white;
}

.toast-error {
  color: white;
  background: #C04040;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  padding: var(--space-6);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: var(--space-8);
  transform: translateY(24px) scale(0.97);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
}

.modal-overlay.active .modal-content {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text-primary);
  background: var(--color-overlay);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  color: var(--color-text-primary);
}

.modal-body .project-card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-overlay);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.modal-body .project-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-body .modal-project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.modal-body .modal-project-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.modal-body .modal-project-desc {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.modal-detail-item {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}

.modal-detail-item:last-child {
  padding-bottom: 0;
}

.modal-detail-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-1);
}

.modal-detail-value {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
}

.modal-project-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 767px) {
  .modal-overlay {
    padding: var(--space-4);
    align-items: flex-end;
  }

  .modal-content {
    max-height: 90vh;
    padding: var(--space-6);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transform: translateY(40px) scale(1);
  }

  .modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
  }

  .modal-body .modal-project-title {
    font-size: var(--text-xl);
  }
}