/* =========================================================
   YANNA — a tiny interactive love letter
   Mobile-first. Dark, quiet, intentional.
   ========================================================= */

:root {
  --black: #060309;
  --midnight: #0d0a18;
  --midnight-2: #140f24;
  --ink: #050208;

  --off-white: #f6f1f2;
  --dim: rgba(246, 241, 242, 0.58);
  --dimmer: rgba(246, 241, 242, 0.34);

  --glow-pink: rgba(224, 168, 196, 0.16);
  --glow-purple: rgba(150, 110, 210, 0.22);
  --glow-purple-soft: rgba(150, 110, 210, 0.10);

  --serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);

  color-scheme: dark;
}

/* ---------- reset ---------- */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
  background: var(--black);
}
body {
  min-height: 100svh;
  min-height: 100dvh;
  color: var(--off-white);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  position: relative;
}
img { -webkit-user-drag: none; user-drag: none; }
button {
  font-family: inherit;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
h1, h2, p { margin: 0; }

/* ---------- background atmosphere ---------- */
.glow-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 50% at 30% 20%, var(--glow-purple-soft), transparent 60%),
    radial-gradient(50% 40% at 75% 75%, var(--glow-pink), transparent 65%),
    linear-gradient(180deg, var(--ink) 0%, var(--midnight) 55%, var(--midnight-2) 100%);
  background-size: 140% 140%, 140% 140%, 100% 100%;
  background-position: 0% 0%, 100% 100%, 0 0;
  animation: driftGlow 22s ease-in-out infinite alternate;
}

@keyframes driftGlow {
  to { background-position: 15% 10%, 85% 90%, 0 0; }
}

#particles {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* ---------- stages ---------- */
.stage {
  position: relative;
  z-index: 2;
  min-height: 100svh;
  min-height: 100dvh;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8vh 6vw;
  text-align: center;
}

.stage--cinematic,
.stage--secret,
.stage--final {
  position: fixed;
  inset: 0;
  min-height: 100svh;
}

/* =========================================================
   INTRO
   ========================================================= */
.intro-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(10px, 3vw, 18px);
}

.reveal-item {
  opacity: 0;
  transform: translateY(14px);
  filter: blur(6px);
  animation: revealUp 1.6s var(--ease-out) forwards;
}
.intro-sub.reveal-item { animation-delay: 1.1s; }
.open-btn.reveal-item { animation-delay: 2.1s; }

@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

.intro-name {
  font-family: var(--serif);
  font-weight: 500;
  font-style: italic;
  font-size: clamp(2.6rem, 13vw, 4.5rem);
  letter-spacing: 0.02em;
  color: var(--off-white);
  text-shadow: 0 0 40px rgba(200, 160, 220, 0.25);
}

.intro-sub {
  font-family: var(--sans);
  font-weight: 300;
  font-size: clamp(0.85rem, 3.6vw, 1rem);
  letter-spacing: 0.14em;
  text-transform: lowercase;
  color: var(--dim);
}

.open-btn {
  margin-top: clamp(28px, 8vw, 44px);
  padding: 14px 30px;
  min-height: 48px;
  border-radius: 999px;
  border: 1px solid rgba(246, 241, 242, 0.28);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--off-white);
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(6px);
  transition: border-color 0.4s var(--ease-soft), background 0.4s var(--ease-soft), transform 0.2s var(--ease-soft);
}
.open-btn:active { transform: scale(0.96); }
@media (hover: hover) {
  .open-btn:hover {
    border-color: rgba(246, 241, 242, 0.55);
    background: rgba(255, 255, 255, 0.06);
  }
}
.open-btn .heart-mark { opacity: 0.85; }

.stage--intro.is-leaving {
  animation: fadeOutStage 1.1s var(--ease-soft) forwards;
}
@keyframes fadeOutStage {
  to { opacity: 0; filter: blur(10px); }
}

/* =========================================================
   MAIN
   ========================================================= */
.stage--main {
  gap: clamp(28px, 6vh, 48px);
  padding-top: 10vh;
  padding-bottom: 12vh;
}

/* --- photo --- */
.photo-wrap {
  position: relative;
  width: min(78vw, 320px);
  aspect-ratio: 4 / 5;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.92);
  filter: blur(14px);
}
.stage--main.is-active .photo-wrap {
  animation: photoReveal 2.2s var(--ease-out) forwards;
  animation-delay: 0.3s;
}
@keyframes photoReveal {
  to { opacity: 1; transform: scale(1); filter: blur(0); }
}

.photo-glow {
  position: absolute;
  inset: -18%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-purple) 0%, var(--glow-pink) 35%, transparent 68%);
  filter: blur(30px);
  opacity: 0.7;
  z-index: 0;
  transition: opacity 0.6s var(--ease-soft), transform 0.6s var(--ease-soft);
}

.photo-frame {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 28px;
  overflow: hidden;
  z-index: 1;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 30px 60px -20px rgba(0, 0, 0, 0.7),
    0 0 80px -10px rgba(170, 130, 210, 0.25);
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.35s var(--ease-soft);
}

.photo-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 -40px 60px -20px rgba(0,0,0,0.55), inset 0 30px 50px -30px rgba(0,0,0,0.4);
  pointer-events: none;
  z-index: 3;
}

.photo-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 16%;
  display: block;
}
.photo-img[data-broken="true"] { display: none; }

.photo-timestamp {
  position: absolute;
  right: 14px;
  bottom: 12px;
  z-index: 4;
  font-family: 'DM Sans', var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: rgba(255, 176, 94, 0.78);
  text-shadow: 0 0 8px rgba(255, 150, 60, 0.35);
  pointer-events: none;
  opacity: 0;
}
.stage--main.is-active .photo-timestamp {
  animation: fadeIn 1.2s var(--ease-soft) forwards;
  animation-delay: 2.1s;
}

.photo-placeholder {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(120% 100% at 50% 0%, rgba(180, 140, 210, 0.22), transparent 60%),
    linear-gradient(160deg, #171025 0%, #0c0814 100%);
}
.photo-placeholder.is-visible { display: flex; }
.placeholder-mark {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 5rem;
  color: rgba(246, 241, 242, 0.5);
  text-shadow: 0 0 50px rgba(190, 150, 220, 0.4);
}

.photo-sheen {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.08) 48%, transparent 60%);
  transform: translateX(-30%);
  pointer-events: none;
  opacity: 0;
}
.stage--main.is-active .photo-sheen {
  animation: sheenSweep 2.6s var(--ease-out) forwards;
  animation-delay: 0.9s;
}
@keyframes sheenSweep {
  0% { opacity: 0; transform: translateX(-40%); }
  35% { opacity: 1; }
  100% { opacity: 0; transform: translateX(40%); }
}

/* --- text --- */
.main-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4em;
  opacity: 0;
  transform: translateY(10px);
}
.stage--main.is-active .main-text {
  animation: revealUp 1.8s var(--ease-out) forwards;
  animation-delay: 1.6s;
}

.headline {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.2rem, 10vw, 3.4rem);
  letter-spacing: 0.03em;
  color: var(--off-white);
  text-shadow: 0 0 46px rgba(210, 170, 225, 0.3);
  transition: opacity 0.5s var(--ease-soft);
  white-space: pre-line;
}

.subline {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.1rem, 5vw, 1.5rem);
  color: var(--dim);
  transition: opacity 0.5s var(--ease-soft);
}

.since-line {
  margin-top: 0.3em;
  font-family: var(--sans);
  font-weight: 300;
  font-size: clamp(0.72rem, 3vw, 0.82rem);
  letter-spacing: 0.06em;
  color: var(--dimmer);
}

/* --- music toggle --- */
.music-toggle {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  right: max(18px, env(safe-area-inset-right));
  z-index: 20;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(246, 241, 242, 0.18);
  background: rgba(10, 8, 16, 0.4);
  backdrop-filter: blur(8px);
  opacity: 0;
  animation: fadeIn 1s var(--ease-soft) forwards;
  animation-delay: 0.3s;
}
.music-icon {
  font-size: 1.05rem;
  color: var(--dim);
  transition: opacity 0.3s;
}
.music-toggle[aria-pressed="false"] .music-icon { opacity: 0.45; }

@keyframes fadeIn { to { opacity: 1; } }

/* --- final affordance --- */
.final-affordance {
  position: fixed;
  bottom: max(28px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 15;
  font-size: 1.1rem;
  color: rgba(246, 241, 242, 0.32);
  padding: 12px 18px;
  min-width: 44px;
  min-height: 44px;
  opacity: 0;
  transition: opacity 0.4s var(--ease-soft), color 0.4s;
}
.final-affordance.is-shown {
  animation: pulseFaint 3.4s ease-in-out infinite;
}
@keyframes pulseFaint {
  0%, 100% { opacity: 0.28; }
  50% { opacity: 0.65; }
}
@media (hover: hover) {
  .final-affordance:hover { color: rgba(246, 241, 242, 0.7); }
}

/* =========================================================
   TAP EFFECTS (floating hearts / sparks / phrases)
   ========================================================= */
#tap-layer {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  overflow: hidden;
}

.tap-fx {
  position: absolute;
  transform: translate(-50%, -50%);
  will-change: transform, opacity;
  color: rgba(240, 210, 225, 0.9);
  font-size: 1.1rem;
  text-shadow: 0 0 12px rgba(220, 170, 210, 0.6);
}

.tap-fx--heart { animation: floatHeart 1.4s var(--ease-out) forwards; }
.tap-fx--spark {
  width: 6px; height: 6px; border-radius: 50%;
  background: radial-gradient(circle, #fff, rgba(220,180,230,0.5) 60%, transparent 75%);
  animation: floatSpark 0.9s var(--ease-out) forwards;
}
.tap-fx--phrase {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  white-space: nowrap;
  color: rgba(246, 241, 242, 0.85);
  animation: floatPhrase 2.1s var(--ease-out) forwards;
}

@keyframes floatHeart {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
  15% { opacity: 1; transform: translate(-50%, -60%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -160%) scale(0.85); }
}
@keyframes floatSpark {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
  20% { opacity: 1; transform: translate(-50%, -50%) scale(1.4); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(0.2); }
}
@keyframes floatPhrase {
  0% { opacity: 0; transform: translate(-50%, -40%); }
  18% { opacity: 1; transform: translate(-50%, -60%); }
  100% { opacity: 0; transform: translate(-50%, -140%); }
}

/* =========================================================
   CINEMATIC "I LOVE YOU" GROWTH
   ========================================================= */
.stage--cinematic {
  z-index: 40;
  background: radial-gradient(70% 60% at 50% 45%, rgba(30, 20, 45, 0.9), var(--ink) 75%);
}

.cinematic-text {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 12vw, 4rem);
  letter-spacing: 0.04em;
  color: var(--off-white);
  text-shadow: 0 0 60px rgba(210, 170, 225, 0.45);
  white-space: pre-line;
  transform: scale(1);
  opacity: 1;
}

.cinematic-text.is-growing {
  animation: cinematicGrow 2.8s cubic-bezier(0.3, 0, 0.2, 1) forwards;
}
@keyframes cinematicGrow {
  0% { transform: scale(1) translateZ(0); opacity: 1; letter-spacing: 0.04em; }
  70% { opacity: 1; }
  100% { transform: scale(5.6); opacity: 0; letter-spacing: 0.12em; }
}

.cinematic-text.is-settling {
  animation: cinematicSettle 1.6s var(--ease-out) forwards;
}
@keyframes cinematicSettle {
  0% { opacity: 0; transform: scale(0.85); filter: blur(8px); }
  100% { opacity: 1; transform: scale(1); filter: blur(0); }
}

/* =========================================================
   SECRET SURPRISE
   ========================================================= */
.stage--secret {
  z-index: 50;
  background: var(--ink);
}
.secret-text {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.5rem, 7vw, 2.4rem);
  color: var(--off-white);
  text-shadow: 0 0 40px rgba(210, 170, 225, 0.35);
  opacity: 0;
  transform: translateY(8px);
  padding: 0 6vw;
}
.secret-text.is-shown {
  animation: revealUp 1.1s var(--ease-out) forwards;
}
.secret-text.is-hiding {
  animation: fadeOutStage 0.6s var(--ease-soft) forwards;
}

/* =========================================================
   FINAL SCREEN
   ========================================================= */
.stage--final {
  z-index: 60;
  background: var(--black);
}
.final-text {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 8vw, 2.8rem);
  color: var(--off-white);
  opacity: 0;
  transform: translateY(6px);
  padding: 0 6vw;
  text-align: center;
}
.final-text.is-shown { animation: revealUp 1.4s var(--ease-out) forwards; }
.final-text.is-hiding { animation: fadeOutStage 0.9s var(--ease-soft) forwards; }

.restart-dot {
  position: absolute;
  bottom: max(30px, env(safe-area-inset-bottom));
  width: 44px;
  height: 44px;
  border-radius: 50%;
  opacity: 0;
  transition: opacity 1.2s var(--ease-soft);
}
.restart-dot::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(246, 241, 242, 0.4);
}
.restart-dot.is-shown { opacity: 1; }

/* =========================================================
   VISIBILITY HELPERS
   ========================================================= */
[hidden] { display: none !important; }

/* =========================================================
   TABLET / DESKTOP
   ========================================================= */
@media (min-width: 640px) {
  .photo-wrap { width: min(50vw, 340px); }
  .intro-name { font-size: 4.6rem; }
}

@media (min-width: 1024px) {
  .stage--main { flex-direction: row; gap: 8vw; padding: 0 8vw; }
  .photo-wrap { width: 360px; }
  .main-text { align-items: flex-start; text-align: left; }
}

/* =========================================================
   REDUCED MOTION
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.2s !important;
  }
  .glow-field { animation: none; }
  .final-affordance.is-shown { animation: none; opacity: 0.5; }
  .reveal-item, .main-text, .photo-wrap, .photo-sheen,
  .secret-text, .final-text, .cinematic-text {
    filter: none !important;
  }
}