@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

:root {
    --bg-base: #02040a;
    --bg-grad-1: #050916;
    --bg-grad-2: #081120;
    --bg-grad-3: #0d1b35;
    --bg-grid: rgba(148, 163, 184, 0.08);
    --bg-speck: rgba(255, 255, 255, 0.04);

    --nebula-1: rgba(56, 189, 248, 0.18);
    --nebula-2: rgba(96, 165, 250, 0.16);
    --nebula-3: rgba(251, 191, 36, 0.1);
    --nebula-4: rgba(244, 114, 182, 0.08);

    --panel-bg: rgba(7, 12, 22, 0.44);
    --panel-border: rgba(255, 255, 255, 0.1);
    --panel-border-glow: rgba(251, 191, 36, 0.18);
    --panel-shadow: 0 40px 100px -28px rgba(0, 0, 0, 0.9);
    
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --text-muted: #475569;
    
    --accent-gold: #fbbf24;
    --accent-gold-hover: #f59e0b;
    --accent-gold-glow: rgba(251, 191, 36, 0.46);
    --accent-blue-glow: rgba(96, 165, 250, 0.28);
    --accent-white-glow: rgba(255, 255, 255, 0.16);

    --input-bg: rgba(0, 0, 0, 0.4);
    --input-border: rgba(255, 255, 255, 0.12);
    --input-focus: rgba(251, 191, 36, 0.3);

    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --pointer-x: 0;
    --pointer-y: 0;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    overflow-y: auto;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.cosmic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background:
        radial-gradient(circle at 50% 10%, rgba(255, 255, 255, 0.04) 0%, transparent 16%),
        radial-gradient(circle at 18% 16%, rgba(96, 165, 250, 0.06) 0%, transparent 22%),
        radial-gradient(circle at 82% 14%, rgba(251, 191, 36, 0.04) 0%, transparent 20%),
        linear-gradient(180deg, var(--bg-grad-3) 0%, var(--bg-grad-2) 32%, var(--bg-grad-1) 68%, var(--bg-base) 100%);
}

.cosmic-gradient {
    position: absolute;
    inset: -12%;
    background:
        linear-gradient(118deg, transparent 24%, rgba(255, 255, 255, 0.035) 40%, rgba(96, 165, 250, 0.06) 48%, rgba(255, 255, 255, 0.03) 55%, rgba(251, 191, 36, 0.045) 62%, transparent 76%),
        radial-gradient(ellipse at 44% 46%, rgba(255, 255, 255, 0.045) 0%, transparent 28%),
        radial-gradient(ellipse at 62% 54%, rgba(96, 165, 250, 0.05) 0%, transparent 30%),
        radial-gradient(circle at 50% 60%, rgba(3, 7, 18, 0) 0%, rgba(2, 4, 10, 0.2) 52%, rgba(2, 4, 10, 0.86) 100%);
    mix-blend-mode: screen;
    opacity: 0.34;
    filter: blur(18px);
    transform: translate3d(calc(var(--pointer-x) * -8px), calc(var(--pointer-y) * -8px), 0) scale(1.04);
    transition: transform 1.2s ease-out;
}

.cosmic-bg::before,
.cosmic-bg::after {
    content: '';
    position: absolute;
    inset: -10%;
    pointer-events: none;
}

.cosmic-bg::before {
    background:
        radial-gradient(circle at 22% 20%, rgba(255, 255, 255, 0.05) 0, transparent 16%),
        radial-gradient(circle at 76% 18%, rgba(96, 165, 250, 0.05) 0, transparent 18%),
        radial-gradient(circle at 54% 72%, rgba(251, 191, 36, 0.04) 0, transparent 18%);
    transform: translate3d(calc(var(--pointer-x) * -18px), calc(var(--pointer-y) * -18px), 0);
    transition: transform 0.9s ease-out;
}

.cosmic-bg::after {
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.012), transparent 58%);
    opacity: 0.42;
}

.space-grid {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 50% 52%, rgba(255, 255, 255, 0.035) 0, transparent 56%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 32%),
        radial-gradient(circle at 50% 120%, rgba(96, 165, 250, 0.07) 0, transparent 42%);
    opacity: 0.1;
    filter: blur(34px);
    transform: translate3d(calc(var(--pointer-x) * 7px), calc(var(--pointer-y) * 10px), 0) scale(1.08);
    transition: transform 1.1s ease-out;
}

.dust-layer {
    position: absolute;
    inset: -20%;
    background-image:
        radial-gradient(circle at 20% 20%, var(--bg-speck) 0 1px, transparent 1.4px),
        radial-gradient(circle at 68% 32%, rgba(255, 255, 255, 0.05) 0 1px, transparent 1.5px),
        radial-gradient(circle at 42% 74%, rgba(251, 191, 36, 0.03) 0 1px, transparent 1.5px),
        radial-gradient(circle at 84% 64%, rgba(96, 165, 250, 0.04) 0 1px, transparent 1.5px);
    background-size: 220px 220px, 280px 280px, 260px 260px, 320px 320px;
    opacity: 0.34;
}

.dust-layer-1 {
    animation: driftDust 40s linear infinite;
}

.dust-layer-2 {
    opacity: 0.16;
    transform: scale(1.16);
    animation: driftDustReverse 54s linear infinite;
}

.nebula {
    position: absolute;
    border-radius: 50%;
    filter: blur(130px);
    opacity: 0.8;
    mix-blend-mode: screen;
    animation: drift 20s infinite alternate ease-in-out;
    will-change: transform;
    --nebula-shift-x: 0px;
    --nebula-shift-y: 0px;
}

.nebula-1 {
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.34) 0%, var(--nebula-1) 36%, transparent 74%);
    top: -24vw;
    left: -14vw;
    animation-duration: 30s;
    --nebula-shift-x: calc(var(--pointer-x) * -22px);
    --nebula-shift-y: calc(var(--pointer-y) * -18px);
}

.nebula-2 {
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(96, 165, 250, 0.26) 0%, var(--nebula-2) 42%, transparent 74%);
    bottom: -14vw;
    right: -10vw;
    animation-duration: 26s;
    animation-delay: -5s;
    --nebula-shift-x: calc(var(--pointer-x) * 18px);
    --nebula-shift-y: calc(var(--pointer-y) * 14px);
}

.nebula-3 {
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(251, 191, 36, 0.18) 0%, var(--nebula-3) 40%, transparent 72%);
    top: 38%;
    left: 24%;
    animation-duration: 34s;
    animation-delay: -10s;
    --nebula-shift-x: calc(var(--pointer-x) * -10px);
    --nebula-shift-y: calc(var(--pointer-y) * 10px);
}

.aurora {
    position: absolute;
    width: 54vw;
    height: 54vw;
    border-radius: 50%;
    filter: blur(24px);
    mix-blend-mode: screen;
    opacity: 0.12;
}

.aurora-1 {
    top: -10vh;
    left: 8vw;
    background: radial-gradient(ellipse at 50% 50%, rgba(96, 165, 250, 0.16) 0%, rgba(255, 255, 255, 0.05) 24%, transparent 62%);
    animation: auroraSweep 24s ease-in-out infinite alternate;
}

.aurora-2 {
    right: 4vw;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 50%, rgba(251, 191, 36, 0.12) 0%, rgba(244, 114, 182, 0.06) 26%, transparent 62%);
    animation: auroraSweep 28s ease-in-out infinite alternate-reverse;
}

.light-column {
    display: none;
}

.light-column-1 {
    left: 8vw;
}

.light-column-2 {
    right: 10vw;
    transform: rotate(-14deg);
    background: linear-gradient(180deg, rgba(251, 191, 36, 0.08) 0%, rgba(255, 255, 255, 0.04) 18%, transparent 62%);
}

.orbital-ring {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 999px;
    opacity: 0.08;
    box-shadow: inset 0 0 22px rgba(255, 255, 255, 0.008), 0 0 12px rgba(96, 165, 250, 0.02);
}

.orbital-ring-1 {
    width: 62vw;
    height: 62vw;
    top: 2vh;
    left: 50%;
    transform: translateX(-50%) rotate(12deg);
}

.orbital-ring-2 {
    width: 82vw;
    height: 82vw;
    top: -18vh;
    left: 54%;
    opacity: 0.16;
    transform: translateX(-50%) rotate(-10deg);
}

#starfield {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

.vignette {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 30%, rgba(2, 4, 10, 0.8) 100%);
    pointer-events: none;
}

@keyframes drift {
    0% {
        transform: translate3d(var(--nebula-shift-x), var(--nebula-shift-y), 0) scale(1);
    }

    100% {
        transform: translate3d(calc(var(--nebula-shift-x) + 3%), calc(var(--nebula-shift-y) + 5%), 0) scale(1.05);
    }
}

@keyframes rotateField {
    from { opacity: 0.44; }
    50% { opacity: 0.62; }
    to { opacity: 0.5; }
}

@keyframes driftDust {
    from { transform: translate3d(0, 0, 0); }
    to { transform: translate3d(40px, -28px, 0); }
}

@keyframes driftDustReverse {
    from { transform: scale(1.16) translate3d(0, 0, 0); }
    to { transform: scale(1.16) translate3d(-36px, 24px, 0); }
}

@keyframes auroraSweep {
    0% { transform: translate3d(0, 0, 0) scale(0.96); }
    100% { transform: translate3d(18px, -12px, 0) scale(1.06); }
}

.login-stage {
    position: relative;
    z-index: 10;
    width: min(100%, 460px);
    transform: translate3d(calc(var(--pointer-x) * 8px), calc(var(--pointer-y) * 8px), 0);
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.login-aura {
    display: none;
}

.login-container {
    width: 100%;
    max-width: 430px;
    padding: 52px 40px 44px;
    background: var(--panel-bg);
    backdrop-filter: blur(36px) saturate(140%);
    -webkit-backdrop-filter: blur(36px) saturate(140%);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    box-shadow: var(--panel-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    z-index: 2;
    opacity: 0;
    transform: translateY(30px) scale(0.98);
    animation: cinematicEntry 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    overflow: hidden;
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform var(--transition-smooth);
}

.login-container::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(255,255,255,0.14) 0%, transparent 42%, rgba(255,255,255,0.06) 100%);
    z-index: -1;
    pointer-events: none;
}

.login-container::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 24px;
    background:
        radial-gradient(circle at 50% 115%, rgba(96, 165, 250, 0.05), transparent 28%),
        linear-gradient(180deg, rgba(255,255,255,0.03), transparent 30%, rgba(255,255,255,0.02) 100%);
    opacity: 0.5;
    pointer-events: none;
}

.login-container:hover {
    border-color: var(--panel-border-glow);
    box-shadow: var(--panel-shadow), 0 0 44px rgba(251, 191, 36, 0.1), 0 0 90px var(--accent-blue-glow), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

@keyframes cinematicEntry {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
        filter: blur(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.05);
    color: rgba(248, 250, 252, 0.8);
    font-size: 11px;
    letter-spacing: 0.18em;
}

.eyebrow::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: radial-gradient(circle, #fff7d1 0%, var(--accent-gold) 60%, transparent 100%);
    box-shadow: 0 0 12px var(--accent-gold-glow);
}

.logo-icon {
    width: 76px;
    height: 76px;
    margin: 0 auto 20px;
    padding: 6px;
    background:
        linear-gradient(145deg, rgba(255,255,255,0.18), rgba(255,255,255,0.04)),
        radial-gradient(circle at 30% 30%, rgba(251, 191, 36, 0.18), transparent 60%),
        rgba(4, 9, 18, 0.82);
    border-radius: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 18px 40px rgba(0,0,0,0.45), 0 12px 30px rgba(251,191,36,0.12), inset 0 1px 0 rgba(255,255,255,0.22);
    position: relative;
    overflow: hidden;
}

.app-brand-icon {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 18px;
    display: block;
    box-shadow: 0 0 24px rgba(255,255,255,0.1);
}

.logo-icon::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 18px;
    box-shadow: 0 0 20px var(--accent-gold-glow);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.login-container:hover .logo-icon::after {
    opacity: 1;
}

.login-header h1 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 10px;
    letter-spacing: -0.6px;
    text-shadow: 0 2px 18px rgba(0,0,0,0.55);
}

.login-header p {
    font-size: 14px;
    color: var(--text-sub);
    line-height: 1.6;
    font-weight: 400;
    max-width: 290px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 24px;
    text-align: left;
    opacity: 0;
    transform: translateY(15px);
    animation: slideUpFade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.form-group:nth-child(1) { animation-delay: 0.15s; }
.form-group:nth-child(2) { animation-delay: 0.25s; }
.form-group:nth-child(3) { animation-delay: 0.35s; }
.form-group:nth-child(4) { animation-delay: 0.45s; }

@keyframes slideUpFade {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-sub);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    padding: 16px;
    border-radius: 12px;
    font-size: 15px;
    font-family: 'Pretendard', sans-serif;
    transition: all var(--transition-smooth);
    outline: none;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

input::placeholder {
    color: var(--text-muted);
}

input:focus {
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 1px var(--accent-gold), 0 0 20px var(--input-focus), inset 0 2px 4px rgba(0,0,0,0.2);
    background: rgba(0, 0, 0, 0.6);
}

input:focus-visible,
.btn-submit:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.92);
    outline-offset: 3px;
}

input.pin-input {
    letter-spacing: 8px;
    font-weight: 600;
    font-size: 24px;
    text-align: center;
    padding: 12px;
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-hover) 100%);
    color: #000;
    border: none;
    padding: 16px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-smooth);
    box-shadow: 0 8px 24px var(--accent-gold-glow), inset 0 1px 0 rgba(255,255,255,0.4);
    margin-top: 16px;
    opacity: 0;
    transform: translateY(15px);
    animation: slideUpFade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    animation-delay: 0.55s;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 54px;
}

.btn-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.4), transparent);
    transform: skewX(-20deg);
    transition: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(251, 191, 36, 0.5), inset 0 1px 0 rgba(255,255,255,0.5);
    filter: brightness(1.05);
}

.btn-submit:hover::before {
    left: 150%;
}

.btn-submit:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px var(--accent-gold-glow);
}

.spinner {
    display: none;
    width: 22px;
    height: 22px;
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    border-top-color: #000;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-msg {
    color: #ef4444;
    font-size: 13px;
    margin-top: 16px;
    text-align: center;
    font-weight: 500;
    display: none;
    animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
    background: rgba(239, 68, 68, 0.1);
    padding: 10px;
    border-radius: 8px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

.view-section {
    display: none;
}

.view-section.active {
    display: block;
}

@media (prefers-reduced-motion: reduce) {
    .nebula {
        animation: none;
    }
    .cosmic-gradient,
    .dust-layer,
    .aurora {
        animation: none;
    }
    .login-stage,
    .login-aura,
    .cosmic-bg::before,
    .space-grid {
        transform: none;
        transition: none;
    }
    .login-container, .form-group, .btn-submit {
        animation: none;
        opacity: 1;
        transform: none;
    }
    .btn-submit::before {
        display: none;
    }
}

@media (max-width: 480px) {
    body {
        align-items: flex-start;
        padding: 32px 0;
    }

    .login-stage {
        width: min(100%, 92vw);
        margin: 0 auto;
    }

    .login-aura {
        inset: -56px;
    }

    .login-container {
        padding: 32px 24px;
        border-radius: 20px;
        max-width: none;
    }

    .login-header h1 {
        font-size: 22px;
    }

    .logo-icon {
        width: 64px;
        height: 64px;
    }

    .app-brand-icon {
        border-radius: 15px;
    }

    .eyebrow {
        font-size: 10px;
        letter-spacing: 0.18em;
    }

    input.pin-input {
        letter-spacing: 5px;
        font-size: 20px;
    }
}