/* ============================================
   GitHub Pages Portfolio — Sakura Theme
   Light blue sky + cherry blossom
   ============================================ */

:root {
  /* Light blue + sakura palette */
  --sky-light:      #EAF4FC;
  --sky-blue:       #D4ECFC;
  --sky-deep:       #B8DEFA;
  --soft-pink:      #FFF0F5;
  --cream:          #FFFAF5;
  --mint:           #E8F8EE;
  --sakura-light:   #FFE4EC;
  --sakura:         #FFB7C5;
  --sakura-deep:    #E8649E;
  --branch-brown:   #8B6F5E;
  --text-dark:      #2C4A6E;
  --text-mid:       #4A6FA5;
  --text-light:     #7B9CC0;
  --glass-bg:       rgba(255, 255, 255, 0.72);
  --glass-border:   rgba(180, 210, 240, 0.30);
  --glass-shadow:   rgba(150, 190, 230, 0.12);
  --accent-purple:  #A87CDB;
  --accent-cyan:    #7EC8E3;
  --accent-pink:    #FFB7C5;
  --accent-gold:    #F5C56A;
  color-scheme: light;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

/* ---------- Page body ---------- */
body {
  min-height: 100vh;
  background:
    /* 极淡暖光漂移 */
    radial-gradient(ellipse 80% 60% at 25% 30%, rgba(255,252,248,0.30) 0%, transparent 70%),
    radial-gradient(ellipse 70% 50% at 75% 65%, rgba(252,250,255,0.25) 0%, transparent 70%),
    /* 柔和白雾 */
    radial-gradient(ellipse 120% 80% at 50% 20%, rgba(255,255,255,0.60) 0%, transparent 60%),
    radial-gradient(ellipse 100% 70% at 80% 80%, rgba(255,255,255,0.45) 0%, transparent 55%),
    /* 留白 */
    radial-gradient(ellipse 60% 50% at 10% 90%, rgba(255,255,255,0.65) 0%, transparent 70%),
    /* 基础白色透明渐变 */
    linear-gradient(145deg, #FDFDFE 0%, #FCFCFD 15%, #FBFBFC 30%, #FAFBFC 50%, #F9FAFC 65%, #FBFCFD 80%, #FDFEFE 100%);
  background-size: 200% 200%, 200% 200%, 100% 100%, 100% 100%, 100% 100%, 100% 100%;
  animation: fogDrift 28s ease-in-out infinite;
  color: var(--text-dark);
  overflow-x: hidden;
  position: relative;
}

/* 背景光晕缓慢漂移 */
@keyframes fogDrift {
  0%   { background-position: 0% 0%, 100% 100%, 0 0, 0 0, 0 0, 0 0; }
  25%  { background-position: 10% 15%, 85% 70%, 0 0, 0 0, 0 0, 0 0; }
  50%  { background-position: 20% 5%, 75% 85%, 0 0, 0 0, 0 0, 0 0; }
  75%  { background-position: 5% 20%, 90% 60%, 0 0, 0 0, 0 0, 0 0; }
  100% { background-position: 0% 0%, 100% 100%, 0 0, 0 0, 0 0, 0 0; }
}

/* 水彩纸颗粒感（极淡噪声纹理） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* ---------- Starry sky layer ---------- */
.stars-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: white;
  opacity: 0;
  animation: twinkle var(--dur) ease-in-out infinite;
  animation-delay: var(--delay);
  box-shadow: 0 0 6px 1px rgba(255,255,255,0.8);
}

@keyframes twinkle {
  0%, 100% { opacity: 0.05; transform: scale(0.6); }
  50%       { opacity: 0.5;  transform: scale(1.1); }
}

/* Sakura-tinted bokeh stars */
.star--pink   { background: #FFB7C5;   box-shadow: 0 0 8px 2px rgba(255,183,197,0.4); }
.star--purple { background: #D4B5F0;   box-shadow: 0 0 8px 2px rgba(212,181,240,0.4); }
.star--cyan   { background: #A8D8EA;   box-shadow: 0 0 8px 2px rgba(168,216,234,0.4); }
.star--gold   { background: #F5D98E;   box-shadow: 0 0 8px 2px rgba(245,217,142,0.4); }

/* ---------- Sakura canvas layer ---------- */
#sakuraCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

/* ---------- Dragon background watermark ---------- */
.dragon-bg {
  position: fixed;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  width: min(80vw, 700px);
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
  filter: hue-rotate(-20deg) saturate(0.6);
  user-select: none;
}

/* ---------- Canvas for mouse trail ---------- */
#trailCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* ---------- Page shell ---------- */
.page-shell {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 24px 56px;
}

/* ---------- Hero / header ---------- */
.hero {
  position: relative;
  padding: 64px 36px;
  border-radius: 32px;
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  box-shadow:
    0 8px 40px var(--glass-shadow),
    inset 0 1px 0 rgba(255,255,255,0.7);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  margin-bottom: 48px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 32px;
  background: linear-gradient(
    135deg,
    rgba(238,229,248,0.4) 0%,
    rgba(255,240,245,0.3) 40%,
    rgba(216,238,255,0.3) 100%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-content { position: relative; z-index: 1; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(168,124,219,0.18), rgba(240,180,204,0.18));
  color: var(--accent-purple);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  font-size: 0.8rem;
  border: 1px solid rgba(168,124,219,0.25);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #7B4FBF 0%, #E8649E 40%, #FFB7C5 60%, #5B8FD4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-copy {
  max-width: 700px;
  color: var(--text-mid);
  font-size: 1.05rem;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 150px;
  padding: 13px 26px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(168,124,219,0.22);
}

.btn-primary {
  background: linear-gradient(135deg, #A87CDB, #7B4FBF);
  color: #fff;
  box-shadow: 0 4px 16px rgba(168,124,219,0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #B890E8, #8C5FD0);
}

.btn-secondary {
  background: rgba(255,255,255,0.65);
  color: var(--accent-purple);
  border: 1.5px solid rgba(168,124,219,0.35);
  box-shadow: 0 2px 10px rgba(168,124,219,0.15);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.9);
  border-color: rgba(168,124,219,0.55);
}

/* ---------- Sections ---------- */
.section-head { margin-bottom: 24px; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
  padding: 5px 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(168,124,219,0.18), rgba(126,200,227,0.18));
  color: var(--accent-purple);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-size: 0.78rem;
  border: 1px solid rgba(168,124,219,0.25);
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.6rem, 2.4vw, 2.4rem);
  color: var(--text-dark);
  line-height: 1.2;
}

/* ---------- Intro section ---------- */
.intro { padding: 12px 0 48px; }

.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

/* ---------- Glass cards ---------- */
.intro-card,
.project-card {
  border-radius: 24px;
  padding: 28px;
  background: var(--glass-bg);
  border: 1.5px solid var(--glass-border);
  box-shadow:
    0 4px 24px var(--glass-shadow),
    inset 0 1px 0 rgba(255,255,255,0.7);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.intro-card::before,
.project-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  border-radius: 24px 24px 0 0;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink), var(--accent-cyan));
}

.intro-card:hover,
.project-card:hover {
  transform: translateY(-5px);
  box-shadow:
    0 12px 40px rgba(168,124,219,0.15),
    inset 0 1px 0 rgba(255,255,255,0.8);
}

.intro-card h3,
.project-card h3 {
  margin: 0 0 14px;
  color: var(--text-dark);
  font-size: 1.15rem;
}

.intro-card p { color: var(--text-mid); font-size: 0.95rem; }

/* Card icon badges */
.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.card-icon--purple { background: linear-gradient(135deg, rgba(168,124,219,0.25), rgba(168,124,219,0.1)); }
.card-icon--pink   { background: linear-gradient(135deg, rgba(240,180,204,0.25), rgba(240,180,204,0.1)); }
.card-icon--cyan   { background: linear-gradient(135deg, rgba(126,200,227,0.25), rgba(126,200,227,0.1)); }

/* ---------- Projects ---------- */
.projects { padding-bottom: 48px; }

.project-card {
  margin-bottom: 24px;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.project-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tag--purple { background: rgba(168,124,219,0.2); color: #7B4FBF; border: 1px solid rgba(168,124,219,0.3); }
.tag--pink   { background: rgba(240,180,204,0.2); color: #C06B8A; border: 1px solid rgba(240,180,204,0.3); }
.tag--cyan   { background: rgba(126,200,227,0.2); color: #3A8BAD; border: 1px solid rgba(126,200,227,0.3); }

.project-card p {
  color: var(--text-mid);
  font-size: 0.97rem;
  margin-bottom: 8px;
}

.project-card ul {
  margin: 14px 0 0;
  padding-left: 20px;
  list-style: none;
}

.project-card li {
  position: relative;
  padding-left: 4px;
  margin-bottom: 10px;
  color: var(--text-mid);
  font-size: 0.93rem;
}

.project-card li::before {
  content: "◆";
  position: absolute;
  left: -20px;
  color: var(--accent-purple);
  font-size: 0.65rem;
  top: 4px;
}

.project-links { margin-top: 20px; }

.link-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  text-decoration: none;
  background: rgba(255,255,255,0.65);
  color: var(--accent-purple);
  font-weight: 600;
  font-size: 0.9rem;
  border: 1.5px solid rgba(168,124,219,0.3);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.link-button:hover {
  background: rgba(255,255,255,0.9);
  border-color: rgba(168,124,219,0.55);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(168,124,219,0.2);
}

/* ---------- Deploy section ---------- */
.deploy { padding: 0 0 52px; }

.deploy-steps {
  margin: 0;
  padding-left: 22px;
}

.deploy-steps li {
  margin-bottom: 16px;
  color: var(--text-mid);
}

/* ---------- Footer ---------- */
.footer {
  padding: 20px 0 0;
  border-top: 1.5px solid rgba(200,180,230,0.3);
  text-align: center;
}

.footer p {
  color: var(--text-light);
  font-size: 0.88rem;
}

.footer-heart {
  color: #FFB7C5;
  display: inline-block;
  animation: heartbeat 1.4s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.25); }
}

/* ---------- Cartoon mascot ---------- */
.mascot-wrapper {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 120px;
  height: 120px;
  z-index: 100;
  pointer-events: none;
  cursor: default;
  animation: mascotFloat 3s ease-in-out infinite;
  filter: drop-shadow(0 8px 20px rgba(168,124,219,0.35));
}

@keyframes mascotFloat {
  0%, 100% { translate: 0  0;   }
  50%       { translate: 0 -12px; }
}

.mascot-wrapper svg { width: 100%; height: 100%; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(230,216,245,0.4); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--accent-purple), #FFB7C5);
  border-radius: 999px;
}

/* ---------- Selection ---------- */
::selection {
  background: rgba(168,124,219,0.25);
  color: var(--text-dark);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .hero { padding: 40px 22px; border-radius: 24px; }
  .hero h1 { font-size: clamp(2rem, 6vw, 2.8rem); }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; }
  .intro-card, .project-card { border-radius: 20px; }
  .mascot-wrapper { width: 90px; height: 90px; bottom: 16px; right: 16px; }
  .page-shell { padding: 20px 16px 40px; }
}