goldenChart/frontend/src/styles/splashScreen.css

/* GoldenChart splash — 은은한 그라데이션 + 흐릿한 폰 목업 배경 */

.splash {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #06080e;
  color: #e8eaed;
  overflow: hidden;
  font-family: var(--font, 'Noto Sans KR', 'Inter', sans-serif);
}

/* ── 배경 ─────────────────────────────────────────────────────────────────── */

.splash-backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.splash-backdrop__base {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, #05070c 0%, #0a0e16 42%, #070a12 100%);
}

.splash-backdrop__aurora {
  position: absolute;
  inset: 0;
}

.splash-backdrop__aurora--teal,
.splash-backdrop__aurora--gold {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.splash-backdrop__aurora--teal {
  width: min(58vw, 520px);
  height: min(58vw, 520px);
  left: 8%;
  top: 38%;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.14) 0%, rgba(45, 212, 191, 0.05) 45%, transparent 70%);
}

.splash-backdrop__aurora--gold {
  width: min(50vw, 460px);
  height: min(50vw, 460px);
  right: 6%;
  top: 8%;
  background: radial-gradient(circle, rgba(249, 226, 156, 0.18) 0%, rgba(212, 175, 55, 0.08) 42%, transparent 72%);
}

.splash-backdrop__mesh {
  position: absolute;
  inset: -15%;
  opacity: 0.35;
  background: conic-gradient(
    from 42deg at 55% 40%,
    rgba(212, 175, 55, 0.1) 0deg,
    transparent 55deg,
    rgba(34, 197, 94, 0.06) 110deg,
    transparent 200deg,
    rgba(56, 189, 248, 0.04) 280deg,
    transparent 360deg
  );
  filter: blur(48px);
}

/* 대각선 폰 목업 — 중앙→우상단 그라데이션 마스크 */
.splash-backdrop__phones {
  position: absolute;
  inset: 0;
  perspective: 1100px;
  mask-image:
    radial-gradient(ellipse 42% 38% at 50% 48%, transparent 0%, rgba(0, 0, 0, 0.15) 42%, #000 58%),
    linear-gradient(
      125deg,
      rgba(0, 0, 0, 0.25) 0%,
      #000 18%,
      #000 42%,
      rgba(0, 0, 0, 0.45) 58%,
      transparent 78%
    );
  -webkit-mask-image:
    radial-gradient(ellipse 42% 38% at 50% 48%, transparent 0%, rgba(0, 0, 0, 0.15) 42%, #000 58%),
    linear-gradient(
      125deg,
      rgba(0, 0, 0, 0.25) 0%,
      #000 18%,
      #000 42%,
      rgba(0, 0, 0, 0.45) 58%,
      transparent 78%
    );
}

.splash-backdrop__phones-blur {
  position: absolute;
  inset: -5%;
  filter: blur(10px) saturate(0.75) brightness(0.82);
}

.splash-phone {
  position: absolute;
  width: clamp(88px, 10vw, 148px);
  aspect-ratio: 9 / 19.5;
  transform-origin: center center;
  will-change: transform;
}

.splash-phone__frame {
  height: 100%;
  padding: 5px;
  border-radius: clamp(16px, 2.2vw, 24px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(14, 18, 28, 0.42);
  box-shadow:
    0 16px 48px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.splash-phone__notch {
  width: 36%;
  height: 5px;
  margin: 2px auto 4px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.35);
}

.splash-phone__screen {
  height: calc(100% - 14px);
  border-radius: clamp(12px, 1.6vw, 18px);
  overflow: hidden;
}

.splash-phone__svg {
  display: block;
  width: 100%;
  height: 100%;
}

.splash-backdrop__flow-glow {
  position: absolute;
  left: 38%;
  top: 32%;
  width: min(88vw, 840px);
  height: min(68vh, 580px);
  transform: translate(-12%, -8%);
  background: linear-gradient(
    128deg,
    rgba(34, 197, 94, 0.06) 0%,
    rgba(212, 175, 55, 0.09) 35%,
    rgba(249, 226, 156, 0.05) 55%,
    transparent 75%
  );
  filter: blur(64px);
  pointer-events: none;
}

.splash-backdrop__grain {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  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: 180px 180px;
}

.splash-backdrop__vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 62% at 50% 50%, transparent 0%, rgba(5, 7, 12, 0.5) 65%, rgba(2, 3, 6, 0.92) 100%),
    linear-gradient(128deg, transparent 0%, rgba(5, 7, 12, 0.2) 50%, rgba(5, 7, 12, 0.35) 100%);
}

.splash-backdrop__spotlight {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 40% 36% at 50% 46%,
    rgba(255, 255, 255, 0.05) 0%,
    transparent 100%
  );
}

/* ── 로그인 카드 ───────────────────────────────────────────────────────────── */

.splash-center {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: min(92vw, 400px);
  padding: 20px 16px;
}

.splash-card {
  width: 100%;
  padding: 38px 36px 30px;
  border-radius: 18px;
  border: 1px solid rgba(212, 175, 55, 0.55);
  background: rgba(11, 14, 22, 0.97);
  box-shadow:
    0 0 0 1px rgba(212, 175, 55, 0.08) inset,
    0 0 40px rgba(212, 175, 55, 0.1),
    0 24px 64px rgba(0, 0, 0, 0.65);
}

.splash-brand {
  margin: 0 0 30px;
  text-align: center;
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(180deg, #fce9a8 0%, #e8c547 40%, #c9a227 78%, #a67c00 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 2px 12px rgba(212, 175, 55, 0.35));
}

.splash-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.splash-input {
  width: 100%;
  box-sizing: border-box;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(22, 26, 36, 0.95);
  color: #f3f4f6;
  font-size: 0.95rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.splash-input:focus {
  outline: none;
  border-color: rgba(212, 175, 55, 0.45);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.12);
}

.splash-input:disabled {
  opacity: 0.6;
}

.splash-error {
  margin: 0;
  font-size: 0.78rem;
  color: #f87171;
  text-align: center;
}

.splash-login-btn {
  width: 100%;
  margin-top: 6px;
  padding: 14px 16px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 800;
  color: #141008;
  background: linear-gradient(90deg, #f5e6a8 0%, #e8c84a 48%, #d4af37 100%);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.3) inset,
    0 6px 24px rgba(201, 162, 39, 0.4);
  transition: transform 0.12s, filter 0.12s, box-shadow 0.12s;
}

.splash-login-btn:hover:not(:disabled) {
  filter: brightness(1.05);
}

.splash-login-btn:active:not(:disabled) {
  transform: translateY(1px);
}

.splash-login-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.splash-version {
  margin: 24px 0 0;
  text-align: center;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.38);
}

.splash-guest-link {
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.78rem;
  cursor: pointer;
  padding: 4px 8px;
  transition: color 0.15s;
}

.splash-guest-link:hover:not(:disabled) {
  color: rgba(249, 226, 156, 0.9);
}

.splash-guest-link:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .splash-card {
    padding: 30px 24px 24px;
  }

  .splash-brand {
    font-size: 1.75rem;
    margin-bottom: 24px;
  }

  .splash-phone {
    width: clamp(72px, 18vw, 110px);
  }

  .splash-backdrop__phones-blur {
    filter: blur(12px) saturate(0.7) brightness(0.78);
  }

  .splash-backdrop__aurora--teal,
  .splash-backdrop__aurora--gold {
    filter: blur(64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .splash-phone {
    will-change: auto;
  }
}