/* ======================== reset + tokens ======================== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: #0b0b14;
  color: #f5f5f7;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.4;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
button, input { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; padding: 0; }
input { outline: 0; }
a { color: inherit; text-decoration: none; }

:root {
  --bg: #0b0b14;
  --bg-2: #14141f;
  --bg-3: #1d1d2c;
  --fg: #f5f5f7;
  --fg-dim: #a8a8b8;
  --accent: #dd2a7b;
  --accent-2: #515bd4;
  --warn: #ef4444;
  --gold: linear-gradient(135deg, #feda77, #f58529);
  --insta: linear-gradient(135deg, #feda77 0%, #f58529 25%, #dd2a7b 50%, #8134af 75%, #515bd4 100%);
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bot: env(safe-area-inset-bottom, 0);
}

#app { display: flex; flex-direction: column; min-height: 100dvh; }

/* ======================== boot splash ======================== */
.boot-splash { display: grid; place-items: center; height: 100dvh; }
.boot-logo {
  width: 96px; height: 96px; border-radius: 24px;
  background: var(--insta);
  position: relative;
  animation: pulse 1.4s ease-in-out infinite;
}
.boot-logo::before, .boot-logo::after {
  content: ''; position: absolute; inset: 18px; border: 4px solid #fff; border-radius: 18px;
}
.boot-logo::after { inset: 36px; border-radius: 999px; }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.06); } }

/* ======================== top bar ======================== */
.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: calc(8px + var(--safe-top)) 14px 8px;
  background: rgba(11,11,20,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid #1f1f2e;
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 8px; flex: 1; }
.brand-logo {
  width: 28px; height: 28px; border-radius: 8px; background: var(--insta);
  position: relative;
}
.brand-logo::before {
  content: ''; position: absolute; inset: 6px; border: 2px solid #fff; border-radius: 6px;
}
.brand-logo::after {
  content: ''; position: absolute; inset: 11px; border: 2px solid #fff; border-radius: 999px;
}
.brand-name { font-weight: 800; font-size: 18px; letter-spacing: -0.01em; background: var(--insta); -webkit-background-clip: text; background-clip: text; color: transparent; }

.streak { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 999px; background: linear-gradient(135deg, #f97316, #ef4444); font-weight: 700; font-size: 13px; }
.streak-fire { font-size: 14px; }

.counter { font-size: 13px; padding: 4px 8px; border-radius: 8px; background: var(--bg-3); }
.counter b { color: #fbbf24; }

.bell { position: relative; width: 36px; height: 36px; border-radius: 999px; display: grid; place-items: center; background: var(--bg-3); font-size: 16px; }
.bell .badge {
  position: absolute; top: -2px; right: -2px; min-width: 18px; height: 18px; padding: 0 5px;
  border-radius: 999px; background: var(--warn); color: #fff; font-size: 11px; font-weight: 800;
  display: grid; place-items: center;
  box-shadow: 0 0 0 2px var(--bg);
  transform: scale(0); transition: transform .22s cubic-bezier(.4,2,.6,1);
}
.bell .badge.on { transform: scale(1); animation: badgePop 0.6s ease 0.2s; }
@keyframes badgePop { 0% { transform: scale(0); } 60% { transform: scale(1.2); } 100% { transform: scale(1); } }

/* ======================== content + tabbar ======================== */
.content { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding-bottom: calc(72px + var(--safe-bot)); }
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0;
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: rgba(11,11,20,0.94);
  backdrop-filter: blur(14px);
  border-top: 1px solid #1f1f2e;
  padding-bottom: var(--safe-bot);
  z-index: 6;
}
.tab { padding: 12px 6px; text-align: center; font-size: 12px; color: var(--fg-dim); font-weight: 600; }
.tab.on { color: #fff; }
.tab.on::after { content: ''; display: block; width: 18px; height: 2px; margin: 4px auto 0; background: var(--insta); border-radius: 2px; }

/* ======================== feed tabs ======================== */
.feed-tabs { display: flex; gap: 8px; padding: 12px 14px 4px; }
.ftab { padding: 8px 14px; border-radius: 999px; background: var(--bg-3); color: var(--fg-dim); font-weight: 600; font-size: 14px; }
.ftab.on { background: var(--insta); color: #fff; }

.feed { padding: 10px 12px 8px; display: flex; flex-direction: column; gap: 14px; }
.feed-sentinel { height: 1px; }
.feed-end { padding: 22px 16px 36px; text-align: center; color: var(--fg-dim); font-size: 13px; }

/* ======================== card ======================== */
.card {
  background: var(--bg-2);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(0,0,0,0.45);
  border: 1px solid #1f1f2e;
  animation: fadeUp .42s ease both;
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.card-thumb {
  position: relative; height: 220px;
  background-size: cover; background-position: center;
  display: flex; align-items: flex-end;
}
.card-thumb.has-image .thumb-title { background: linear-gradient(180deg, transparent, rgba(0,0,0,0.85)); }
.card-thumb .thumb-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.55));
}
.thumb-title {
  position: relative; z-index: 1;
  padding: 14px 16px; width: 100%;
  font-size: 18px; font-weight: 800; line-height: 1.2;
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
}
.card-thumb.has-image .thumb-title { padding-top: 80px; }

.stamp {
  position: absolute; top: 12px; left: 12px;
  padding: 4px 10px; border-radius: 999px;
  font-size: 11px; font-weight: 800; letter-spacing: 0.04em;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(6px);
  z-index: 2;
  animation: stampIn .5s cubic-bezier(.4,2,.5,1) both;
}
.stamp-trending     { background: linear-gradient(135deg, #ec4899, #8b5cf6); }
.stamp-influential  { background: linear-gradient(135deg, #fbbf24, #ef4444); }
.stamp-hot          { background: linear-gradient(135deg, #f97316, #dd2a7b); }
.stamp-must-read    { background: linear-gradient(135deg, #06b6d4, #515bd4); }
@keyframes stampIn { from { opacity: 0; transform: scale(0.6) rotate(-12deg); } to { opacity: 1; transform: scale(1) rotate(-4deg); } }

.card-body { padding: 12px 16px 14px; }
.card-cats { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.chip {
  padding: 3px 8px; border-radius: 999px;
  background: var(--bg-3); font-size: 11px; font-weight: 600; color: var(--fg-dim);
}

.card-authors { font-size: 13px; color: var(--fg-dim); margin-bottom: 8px; line-height: 1.5; }
.author { color: #d6d6e0; font-weight: 600; padding: 2px 4px; border-radius: 6px; }
.author.followed { background: rgba(221,42,123,0.16); color: #fff; }
.author .tier-badge { font-size: 11px; margin-left: 2px; }

.tier-legend  {
  background: linear-gradient(135deg, #feda77, #f58529); -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 12px rgba(251, 191, 36, 0.6);
  font-weight: 800;
  animation: glowGold 2.4s ease-in-out infinite;
}
@keyframes glowGold { 0%, 100% { filter: brightness(1); } 50% { filter: brightness(1.25); } }
.tier-star {
  background: linear-gradient(135deg, #93c5fd, #c084fc); -webkit-background-clip: text; background-clip: text; color: transparent;
  font-weight: 800;
}
.tier-rising {
  color: #fb923c;
  font-weight: 700;
}

.card-summary { font-size: 13.5px; color: #d4d4dc; margin-bottom: 10px; line-height: 1.5; }
.card-meta { font-size: 11px; color: var(--fg-dim); display: flex; gap: 6px; margin-bottom: 12px; }
.dot { opacity: 0.5; }

.card-actions { display: flex; gap: 8px; }
.act {
  flex: 1; padding: 10px 6px; border-radius: 12px;
  background: var(--bg-3);
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-size: 13px; font-weight: 600;
  transition: transform .18s cubic-bezier(.4,2,.5,1), background .18s;
}
.act:active { transform: scale(0.94); }
.act .ico { font-size: 16px; }
.act-like.on { background: linear-gradient(135deg, #ef4444, #dd2a7b); color: #fff; }
.act-save.on { background: linear-gradient(135deg, #fbbf24, #f97316); color: #fff; }

/* heart burst */
.heart-burst { position: fixed; pointer-events: none; z-index: 50; width: 0; height: 0; }
.heart-particle {
  position: absolute; width: 8px; height: 8px; border-radius: 50%;
  background: #ef4444;
  animation: heartFly .9s ease-out forwards;
  transform-origin: center;
  --ang: 0deg;
}
@keyframes heartFly {
  from { transform: rotate(var(--ang)) translateY(0) scale(1); opacity: 1; }
  to   { transform: rotate(var(--ang)) translateY(-60px) scale(0.4); opacity: 0; }
}

/* ======================== skeleton ======================== */
.skeleton .card-thumb.skel,
.skel-line {
  background: linear-gradient(90deg, var(--bg-3) 0%, #2a2a3c 50%, var(--bg-3) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
  border-radius: 8px;
}
.skel-line { height: 12px; margin-bottom: 8px; }
.skel-line:last-child { width: 70%; }
.skeleton .card-thumb { height: 180px; border-radius: 0; }
@keyframes shimmer { from { background-position: -200% 0; } to { background-position: 200% 0; } }

/* ======================== modal ======================== */
.modal {
  position: fixed; inset: 0; z-index: 80;
  background: rgba(0,0,0,0.75);
  display: grid; place-items: end center;
  animation: modalIn .25s ease;
}
@keyframes modalIn { from { background: rgba(0,0,0,0); } to { background: rgba(0,0,0,0.75); } }
.modal-card {
  width: 100%; max-width: 640px;
  max-height: 90dvh; overflow-y: auto;
  background: var(--bg-2);
  border-radius: 22px 22px 0 0;
  padding: 20px 18px calc(28px + var(--safe-bot));
  position: relative;
  animation: sheetUp .32s cubic-bezier(.4,1.6,.5,1);
}
@keyframes sheetUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
.modal-close { position: absolute; top: 8px; right: 12px; width: 36px; height: 36px; font-size: 22px; color: var(--fg-dim); }
.modal-title { font-size: 22px; line-height: 1.25; margin: 0 0 8px; padding-right: 30px; }
.modal-authors { font-size: 14px; color: var(--fg-dim); margin-bottom: 10px; }
.modal-cats { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.modal-summary { font-size: 14px; color: #e0e0e8; line-height: 1.55; margin-bottom: 18px; white-space: pre-wrap; }
.modal-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  padding: 10px 16px; border-radius: 10px;
  background: var(--bg-3); color: var(--fg);
  font-weight: 600; font-size: 14px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: transform .15s;
}
.btn:active { transform: scale(0.96); }
.btn-primary { background: var(--insta); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid #2c2c3e; }

/* ======================== toasts ======================== */
#toast-stack {
  position: fixed; left: 50%; bottom: calc(82px + var(--safe-bot)); transform: translateX(-50%);
  z-index: 90;
  display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none;
}
.toast {
  background: var(--bg-2); padding: 10px 14px; border-radius: 999px;
  font-size: 13px; font-weight: 600;
  border: 1px solid #2c2c3e;
  opacity: 0; transform: translateY(12px) scale(.95);
  transition: opacity .25s, transform .25s cubic-bezier(.4,2,.5,1);
}
.toast-in { opacity: 1; transform: translateY(0) scale(1); }
.toast-out { opacity: 0; transform: translateY(-12px) scale(.95); }
.toast-xp { background: linear-gradient(135deg, #fbbf24, #ef4444); color: #fff; border-color: transparent; }
.toast-streak { background: linear-gradient(135deg, #f97316, #dd2a7b); color: #fff; border-color: transparent; }

/* ======================== confetti ======================== */
.confetti-wrap { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 95; }
.confetti {
  position: absolute; top: -10px; width: 8px; height: 14px; display: block;
  animation: confFall linear forwards;
}
@keyframes confFall {
  to { transform: translateY(110vh) rotate(720deg); opacity: 0; }
}

/* ======================== onboarding ======================== */
.onboard { display: flex; flex-direction: column; min-height: 100dvh; padding: calc(20px + var(--safe-top)) 20px calc(20px + var(--safe-bot)); }
.onboard-step { display: none; flex: 1; flex-direction: column; animation: fadeUp .4s ease; }
.onboard-step.active { display: flex; }
.onboard-logo { width: 88px; height: 88px; border-radius: 22px; background: var(--insta); margin: auto auto 16px; position: relative; }
.onboard-logo::before { content: ''; position: absolute; inset: 16px; border: 4px solid #fff; border-radius: 16px; }
.onboard-logo::after  { content: ''; position: absolute; inset: 32px; border: 4px solid #fff; border-radius: 999px; }
.onboard-h1 { font-size: 38px; text-align: center; margin: 6px 0; background: var(--insta); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 900; letter-spacing: -0.02em; }
.onboard-h2 { font-size: 26px; margin: 8px 0 4px; font-weight: 800; }
.onboard-tag { text-align: center; color: var(--fg-dim); margin: 0 auto 24px; }
.onboard-sub { color: var(--fg-dim); margin: 0 0 16px; }
.onboard-next { width: 100%; padding: 14px; font-size: 16px; font-weight: 700; margin-top: auto; }
.onboard-foot { display: flex; gap: 10px; padding-top: 12px; margin-top: auto; }
.onboard-foot .btn { flex: 1; padding: 12px; }

.cat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 8px 0 12px; }
.cat-chip {
  padding: 16px 10px; border-radius: 14px;
  background: var(--bg-2); border: 1px solid #1f1f2e;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  font-size: 13px; font-weight: 600; color: var(--fg-dim);
  transition: transform .15s, background .15s;
}
.cat-chip:active { transform: scale(0.96); }
.cat-chip.on {
  background: linear-gradient(135deg, rgba(221,42,123,0.18), rgba(81,91,212,0.18));
  border-color: var(--accent);
  color: #fff;
}
.cat-emoji { font-size: 22px; }

.kw-input, .au-input {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: var(--bg-2); border: 1px solid #2c2c3e; color: var(--fg);
  font-size: 14px; margin: 8px 0;
}
.kw-input:focus, .au-input:focus { border-color: var(--accent); }
.kw-chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 24px; margin-bottom: 8px; }
.kw-chip { padding: 4px 10px; border-radius: 999px; background: var(--bg-3); font-size: 12px; display: inline-flex; align-items: center; gap: 4px; }
.kw-chip button { color: var(--fg-dim); padding: 0 0 0 4px; }

/* ======================== explore ======================== */
.explore { padding: 16px 14px 32px; }
.explore h2 { font-size: 14px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--fg-dim); margin: 18px 0 8px; }
.explore-grid { grid-template-columns: repeat(3, 1fr); }
.kw-row { display: flex; gap: 6px; }

/* ======================== saved + profile ======================== */
.empty { color: var(--fg-dim); text-align: center; padding: 60px 20px; }
.profile { padding: 24px 20px 60px; text-align: center; }
.profile-avatar { width: 92px; height: 92px; border-radius: 999px; margin: 0 auto 12px; background: var(--insta); }
.profile-name { font-size: 20px; font-weight: 800; margin: 0 0 18px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 24px; }
.stat { background: var(--bg-2); border-radius: 14px; padding: 14px 8px; }
.stat b { display: block; font-size: 22px; }
.stat span { font-size: 12px; color: var(--fg-dim); text-transform: uppercase; letter-spacing: 0.04em; }
.follows-summary { background: var(--bg-2); border-radius: 14px; padding: 16px; margin-bottom: 18px; }
.follows-summary h3 { margin: 0 0 6px; font-size: 14px; text-transform: uppercase; color: var(--fg-dim); letter-spacing: 0.06em; }
.follows-summary p { color: var(--fg-dim); margin: 0 0 12px; font-size: 13px; }
.danger { padding-top: 18px; border-top: 1px solid #1f1f2e; }
.muted { color: var(--fg-dim); font-size: 12.5px; line-height: 1.5; }
.muted code { background: var(--bg-3); padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.muted a { color: #93c5fd; text-decoration: underline; }
.hint { margin-top: 8px; }
.sync-row { display: flex; gap: 6px; margin: 8px 0; }
.sync-buttons { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.sync-buttons .btn { font-size: 13px; padding: 8px 12px; }
.profile .follows-summary { text-align: left; }