/* =========================================================
   UNDANGAN ULANG TAHUN — STYLE
   Warna utama bisa diganti lewat variabel :root di bawah ini
   ========================================================= */

:root {
  --pink-light: #ffe1ec;
  --pink: #ff8fb1;
  --pink-dark: #ff5c8a;
  --purple: #c9a7ff;
  --purple-dark: #9b6bff;
  --gold: #f6c667;
  --cream: #fff8f2;
  --text-dark: #5a3d4d;
  --shadow: rgba(155, 60, 110, 0.25);
  --font-title: "Dancing Script", cursive;
  --font-body: "Poppins", sans-serif;
}

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

html, body {
  height: 100%;
}

body {
  font-family: var(--font-body);
  background: linear-gradient(160deg, var(--pink-light), var(--purple) 120%);
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text-dark);
  position: relative;
}

.app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  padding: 24px;
}

/* ---------- STEP MANAGEMENT ---------- */
.step {
  display: none;
  width: 100%;
  max-width: 520px;
  text-align: center;
  animation-duration: .6s;
  animation-fill-mode: both;
}

.step-active {
  display: block;
}

.fade-in-up {
  animation: fadeInUp .7s ease both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- PROGRESS DOTS ---------- */
.progress-dots {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.progress-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,.6);
  border: 2px solid var(--pink-dark);
  transition: all .3s ease;
}

.progress-dots .dot.active {
  background: var(--pink-dark);
  transform: scale(1.25);
}

/* ---------- STEP 1: ENVELOPE ---------- */
.envelope-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.envelope {
  position: relative;
  width: 280px;
  height: 190px;
  cursor: pointer;
  transform-style: preserve-3d;
}

.envelope-back {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #ffffff, var(--pink-light));
  border-radius: 10px;
  box-shadow: 0 20px 40px var(--shadow);
}

.envelope-letter {
  position: absolute;
  left: 50%;
  top: 14px;
  transform: translateX(-50%);
  width: 84%;
  height: 82%;
  background: var(--cream);
  border-radius: 6px;
  box-shadow: 0 6px 14px rgba(0,0,0,.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform .6s ease;
  z-index: 1;
}

.to-text {
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--pink-dark);
  opacity: .8;
}

.recipient-name {
  font-family: var(--font-title);
  font-size: 32px;
  color: var(--purple-dark);
}

.envelope-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  border-left: 140px solid transparent;
  border-right: 140px solid transparent;
  border-top: 95px solid var(--pink);
  transform-origin: top;
  transition: transform .6s ease;
  z-index: 2;
  filter: drop-shadow(0 6px 8px rgba(0,0,0,.12));
}

.envelope-seal {
  position: absolute;
  top: 78px;
  left: 50%;
  transform: translate(-50%, 0);
  font-size: 30px;
  z-index: 3;
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, 0) scale(1); }
  50%      { transform: translate(-50%, 0) scale(1.15); }
}

.envelope.open .envelope-flap {
  transform: rotateX(180deg);
  z-index: 0;
}

.envelope.open .envelope-letter {
  transform: translate(-50%, -70px) scale(1.05);
}

.envelope.open .envelope-seal {
  opacity: 0;
}

.hint-text {
  font-size: 14px;
  color: var(--text-dark);
  opacity: .75;
}

.hint-text.small {
  font-size: 12px;
  margin-top: 8px;
}

/* ---------- CARD (STEP 2) ---------- */
.card {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(6px);
  border-radius: 24px;
  padding: 40px 30px;
  box-shadow: 0 20px 50px var(--shadow);
}

.card-icon {
  font-size: 42px;
  margin-bottom: 10px;
}

.card-title {
  font-family: var(--font-title);
  font-size: 34px;
  color: var(--pink-dark);
  margin-bottom: 16px;
}

.card-message {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--text-dark);
  margin-bottom: 26px;
}

/* ---------- BUTTONS ---------- */
.btn-next, .btn-replay {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  color: #fff;
  background: linear-gradient(135deg, var(--pink-dark), var(--purple-dark));
  border: none;
  padding: 13px 30px;
  border-radius: 40px;
  cursor: pointer;
  box-shadow: 0 10px 20px var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}

.btn-next:hover, .btn-replay:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 26px var(--shadow);
}

.btn-next:active, .btn-replay:active {
  transform: translateY(0);
}

/* ---------- GALLERY (STEP 3) ---------- */
.gallery-wrap {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(6px);
  border-radius: 24px;
  padding: 34px 26px;
  box-shadow: 0 20px 50px var(--shadow);
}

.gallery-title {
  font-family: var(--font-title);
  font-size: 30px;
  color: var(--pink-dark);
  margin-bottom: 18px;
}

.gallery-slider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.gallery-photo-frame {
  width: 260px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 12px 24px rgba(0,0,0,.15);
  background: #fff;
}

.gallery-photo-frame img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
  transition: opacity .3s ease;
}

.gallery-caption {
  padding: 10px 12px 14px;
  font-size: 13.5px;
  color: var(--text-dark);
  font-style: italic;
}

.slider-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: var(--pink);
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .2s ease;
}

.slider-btn:hover {
  background: var(--pink-dark);
}

.gallery-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 16px 0 22px;
}

.gallery-dots .g-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #eecfe0;
  cursor: pointer;
  transition: background .2s ease;
}

.gallery-dots .g-dot.active {
  background: var(--pink-dark);
}

/* ---------- FINAL STEP (STEP 4) ---------- */
.final-wrap {
  padding: 10px;
}

.cake-wrap {
  margin-bottom: 18px;
}

.cake {
  position: relative;
  width: 140px;
  margin: 0 auto;
  height: 110px;
}

.candle {
  position: absolute;
  top: -34px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 30px;
  background: repeating-linear-gradient(45deg, var(--pink-dark), var(--pink-dark) 4px, #fff 4px, #fff 8px);
  border-radius: 3px;
  cursor: pointer;
  z-index: 3;
}

.flame {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 16px;
  background: radial-gradient(circle at 50% 30%, #fff6b0, var(--gold) 60%, #ff9d3c);
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  transition: opacity .3s ease, transform .3s ease;
}

.candle.blown .flame {
  opacity: 0;
  transform: translateX(-50%) scale(.2);
}

.cake-top {
  position: absolute;
  bottom: 62px;
  left: 25px;
  width: 90px;
  height: 30px;
  background: linear-gradient(180deg, #ffd8e6, var(--pink));
  border-radius: 12px 12px 4px 4px;
  z-index: 2;
}

.cake-middle {
  position: absolute;
  bottom: 32px;
  left: 12px;
  width: 116px;
  height: 34px;
  background: linear-gradient(180deg, #ffe9f1, var(--pink-dark));
  border-radius: 10px;
  z-index: 1;
}

.cake-base {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 140px;
  height: 34px;
  background: linear-gradient(180deg, #fff0f6, var(--purple));
  border-radius: 10px;
}

.final-title {
  font-family: var(--font-title);
  font-size: 38px;
  line-height: 1.3;
  color: var(--pink-dark);
  margin-bottom: 18px;
  text-shadow: 0 4px 10px rgba(255,255,255,.6);
}

.final-message {
  background: rgba(255,255,255,.85);
  border-radius: 20px;
  padding: 24px 22px;
  font-size: 15.5px;
  line-height: 1.75;
  box-shadow: 0 14px 30px var(--shadow);
  margin-bottom: 16px;
}

.signature {
  font-style: italic;
  font-size: 14px;
  opacity: .8;
  margin-bottom: 26px;
}

/* ---------- FLOATING FX (hearts / confetti) ---------- */
#floating-fx {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.fx-item {
  position: absolute;
  top: -40px;
  font-size: 22px;
  opacity: .9;
  animation-name: fall;
  animation-timing-function: linear;
  animation-fill-mode: forwards;
}

@keyframes fall {
  from { transform: translateY(0) rotate(0deg); }
  to   { transform: translateY(110vh) rotate(360deg); }
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 480px) {
  .envelope { width: 240px; height: 160px; }
  .envelope-flap { border-left-width: 120px; border-right-width: 120px; border-top-width: 80px; }
  .card-title, .gallery-title { font-size: 26px; }
  .final-title { font-size: 30px; }
  .gallery-photo-frame { width: 200px; }
  .gallery-photo-frame img { height: 200px; }
}